Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _LINUX_SCHED_H |
| 2 | #define _LINUX_SCHED_H |
| 3 | |
David Woodhouse | b7b3c76 | 2006-04-27 00:12:56 +0100 | [diff] [blame] | 4 | /* |
| 5 | * cloning flags: |
| 6 | */ |
| 7 | #define CSIGNAL 0x000000ff /* signal mask to be sent at exit */ |
| 8 | #define CLONE_VM 0x00000100 /* set if VM shared between processes */ |
| 9 | #define CLONE_FS 0x00000200 /* set if fs info shared between processes */ |
| 10 | #define CLONE_FILES 0x00000400 /* set if open files shared between processes */ |
| 11 | #define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */ |
| 12 | #define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */ |
| 13 | #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */ |
| 14 | #define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */ |
| 15 | #define CLONE_THREAD 0x00010000 /* Same thread group? */ |
| 16 | #define CLONE_NEWNS 0x00020000 /* New namespace group? */ |
| 17 | #define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */ |
| 18 | #define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */ |
| 19 | #define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */ |
| 20 | #define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */ |
| 21 | #define CLONE_DETACHED 0x00400000 /* Unused, ignored */ |
| 22 | #define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */ |
| 23 | #define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */ |
Dave Jones | 43bb40c | 2011-01-13 15:45:40 -0800 | [diff] [blame] | 24 | /* 0x02000000 was previously the unused CLONE_STOPPED (Start in stopped state) |
| 25 | and is now available for re-use. */ |
Serge E. Hallyn | 071df10 | 2006-10-02 02:18:17 -0700 | [diff] [blame] | 26 | #define CLONE_NEWUTS 0x04000000 /* New utsname group? */ |
Kirill Korotaev | 25b21cb | 2006-10-02 02:18:19 -0700 | [diff] [blame] | 27 | #define CLONE_NEWIPC 0x08000000 /* New ipcs */ |
Serge E. Hallyn | 77ec739 | 2007-07-15 23:41:01 -0700 | [diff] [blame] | 28 | #define CLONE_NEWUSER 0x10000000 /* New user namespace */ |
Pavel Emelyanov | 30e49c2 | 2007-10-18 23:40:10 -0700 | [diff] [blame] | 29 | #define CLONE_NEWPID 0x20000000 /* New pid namespace */ |
Eric W. Biederman | 169e367 | 2007-09-27 17:10:06 -0700 | [diff] [blame] | 30 | #define CLONE_NEWNET 0x40000000 /* New network namespace */ |
Jens Axboe | fadad878 | 2008-01-24 08:54:47 +0100 | [diff] [blame] | 31 | #define CLONE_IO 0x80000000 /* Clone io context */ |
David Woodhouse | b7b3c76 | 2006-04-27 00:12:56 +0100 | [diff] [blame] | 32 | |
| 33 | /* |
| 34 | * Scheduling policies |
| 35 | */ |
| 36 | #define SCHED_NORMAL 0 |
| 37 | #define SCHED_FIFO 1 |
| 38 | #define SCHED_RR 2 |
| 39 | #define SCHED_BATCH 3 |
Ingo Molnar | 0e6aca4 | 2007-07-09 18:51:57 +0200 | [diff] [blame] | 40 | /* SCHED_ISO: reserved but not implemented yet */ |
| 41 | #define SCHED_IDLE 5 |
Lennart Poettering | ca94c44 | 2009-06-15 17:17:47 +0200 | [diff] [blame] | 42 | /* Can be ORed in to make sure the process is reverted back to SCHED_NORMAL on fork */ |
| 43 | #define SCHED_RESET_ON_FORK 0x40000000 |
David Woodhouse | b7b3c76 | 2006-04-27 00:12:56 +0100 | [diff] [blame] | 44 | |
David Woodhouse | a3b6714 | 2006-04-25 14:54:40 +0100 | [diff] [blame] | 45 | #ifdef __KERNEL__ |
David Woodhouse | b7b3c76 | 2006-04-27 00:12:56 +0100 | [diff] [blame] | 46 | |
| 47 | struct sched_param { |
| 48 | int sched_priority; |
| 49 | }; |
| 50 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | #include <asm/param.h> /* for HZ */ |
| 52 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | #include <linux/capability.h> |
| 54 | #include <linux/threads.h> |
| 55 | #include <linux/kernel.h> |
| 56 | #include <linux/types.h> |
| 57 | #include <linux/timex.h> |
| 58 | #include <linux/jiffies.h> |
| 59 | #include <linux/rbtree.h> |
| 60 | #include <linux/thread_info.h> |
| 61 | #include <linux/cpumask.h> |
| 62 | #include <linux/errno.h> |
| 63 | #include <linux/nodemask.h> |
Martin Schwidefsky | c92ff1b | 2007-10-16 01:24:43 -0700 | [diff] [blame] | 64 | #include <linux/mm_types.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | #include <asm/page.h> |
| 67 | #include <asm/ptrace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | #include <asm/cputime.h> |
| 69 | |
| 70 | #include <linux/smp.h> |
| 71 | #include <linux/sem.h> |
| 72 | #include <linux/signal.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | #include <linux/compiler.h> |
| 74 | #include <linux/completion.h> |
| 75 | #include <linux/pid.h> |
| 76 | #include <linux/percpu.h> |
| 77 | #include <linux/topology.h> |
Peter Zijlstra | 3e26c14 | 2007-10-16 23:25:50 -0700 | [diff] [blame] | 78 | #include <linux/proportions.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | #include <linux/seccomp.h> |
Ingo Molnar | e56d090 | 2006-01-08 01:01:37 -0800 | [diff] [blame] | 80 | #include <linux/rcupdate.h> |
Jiri Pirko | 05725f7 | 2009-04-14 20:17:16 +0200 | [diff] [blame] | 81 | #include <linux/rculist.h> |
Ingo Molnar | 23f78d4a | 2006-06-27 02:54:53 -0700 | [diff] [blame] | 82 | #include <linux/rtmutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | |
David Woodhouse | a3b6714 | 2006-04-25 14:54:40 +0100 | [diff] [blame] | 84 | #include <linux/time.h> |
| 85 | #include <linux/param.h> |
| 86 | #include <linux/resource.h> |
| 87 | #include <linux/timer.h> |
| 88 | #include <linux/hrtimer.h> |
Andrew Morton | 7c3ab73 | 2006-12-10 02:19:19 -0800 | [diff] [blame] | 89 | #include <linux/task_io_accounting.h> |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 90 | #include <linux/latencytop.h> |
David Howells | 9e2b2dc | 2008-08-13 16:20:04 +0100 | [diff] [blame] | 91 | #include <linux/cred.h> |
Peter Zijlstra | fa14ff4 | 2011-09-12 13:06:17 +0200 | [diff] [blame] | 92 | #include <linux/llist.h> |
David Woodhouse | a3b6714 | 2006-04-25 14:54:40 +0100 | [diff] [blame] | 93 | |
| 94 | #include <asm/processor.h> |
H. J. Lu | 36d57ac | 2005-09-06 15:16:49 -0700 | [diff] [blame] | 95 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | struct exec_domain; |
Ingo Molnar | c87e283 | 2006-06-27 02:54:58 -0700 | [diff] [blame] | 97 | struct futex_pi_state; |
Alexey Dobriyan | 286100a | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 98 | struct robust_list_head; |
Akinobu Mita | bddd87c | 2010-02-23 08:55:42 +0100 | [diff] [blame] | 99 | struct bio_list; |
Al Viro | 5ad4e53 | 2009-03-29 19:50:06 -0400 | [diff] [blame] | 100 | struct fs_struct; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 101 | struct perf_event_context; |
Jens Axboe | 73c1010 | 2011-03-08 13:19:51 +0100 | [diff] [blame] | 102 | struct blk_plug; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | |
| 104 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | * List of flags we want to share for kernel threads, |
| 106 | * if only because they are not used by them anyway. |
| 107 | */ |
| 108 | #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND) |
| 109 | |
| 110 | /* |
| 111 | * These are the constant used to fake the fixed-point load-average |
| 112 | * counting. Some notes: |
| 113 | * - 11 bit fractions expand to 22 bits by the multiplies: this gives |
| 114 | * a load-average precision of 10 bits integer + 11 bits fractional |
| 115 | * - if you want to count load-averages more often, you need more |
| 116 | * precision, or rounding will get you. With 2-second counting freq, |
| 117 | * the EXP_n values would be 1981, 2034 and 2043 if still using only |
| 118 | * 11 bit fractions. |
| 119 | */ |
| 120 | extern unsigned long avenrun[]; /* Load averages */ |
Thomas Gleixner | 2d02494 | 2009-05-02 20:08:52 +0200 | [diff] [blame] | 121 | extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | |
| 123 | #define FSHIFT 11 /* nr of bits of precision */ |
| 124 | #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ |
Linus Torvalds | 0c2043a | 2007-10-07 16:17:38 -0700 | [diff] [blame] | 125 | #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ |
| 127 | #define EXP_5 2014 /* 1/exp(5sec/5min) */ |
| 128 | #define EXP_15 2037 /* 1/exp(5sec/15min) */ |
| 129 | |
| 130 | #define CALC_LOAD(load,exp,n) \ |
| 131 | load *= exp; \ |
| 132 | load += n*(FIXED_1-exp); \ |
| 133 | load >>= FSHIFT; |
| 134 | |
| 135 | extern unsigned long total_forks; |
| 136 | extern int nr_threads; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | DECLARE_PER_CPU(unsigned long, process_counts); |
| 138 | extern int nr_processes(void); |
| 139 | extern unsigned long nr_running(void); |
| 140 | extern unsigned long nr_uninterruptible(void); |
| 141 | extern unsigned long nr_iowait(void); |
Peter Zijlstra | 8c215bd | 2010-07-01 09:07:17 +0200 | [diff] [blame] | 142 | extern unsigned long nr_iowait_cpu(int cpu); |
Arjan van de Ven | 69d2587 | 2009-09-21 17:04:08 -0700 | [diff] [blame] | 143 | extern unsigned long this_cpu_load(void); |
| 144 | |
| 145 | |
Peter Zijlstra | 0f004f5 | 2010-11-30 19:48:45 +0100 | [diff] [blame] | 146 | extern void calc_global_load(unsigned long ticks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | |
Steven Rostedt | 7e49fcc | 2009-01-22 19:01:40 -0500 | [diff] [blame] | 148 | extern unsigned long get_parent_ip(unsigned long addr); |
| 149 | |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 150 | struct seq_file; |
| 151 | struct cfs_rq; |
Ingo Molnar | 4cf86d7 | 2007-10-15 17:00:14 +0200 | [diff] [blame] | 152 | struct task_group; |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 153 | #ifdef CONFIG_SCHED_DEBUG |
| 154 | extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m); |
| 155 | extern void proc_sched_set_task(struct task_struct *p); |
| 156 | extern void |
Ingo Molnar | 5cef9ec | 2007-08-09 11:16:47 +0200 | [diff] [blame] | 157 | print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq); |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 158 | #else |
| 159 | static inline void |
| 160 | proc_sched_show_task(struct task_struct *p, struct seq_file *m) |
| 161 | { |
| 162 | } |
| 163 | static inline void proc_sched_set_task(struct task_struct *p) |
| 164 | { |
| 165 | } |
| 166 | static inline void |
Ingo Molnar | 5cef9ec | 2007-08-09 11:16:47 +0200 | [diff] [blame] | 167 | print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 168 | { |
| 169 | } |
| 170 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | |
Linus Torvalds | 4a8342d | 2005-09-29 15:18:21 -0700 | [diff] [blame] | 172 | /* |
| 173 | * Task state bitmask. NOTE! These bits are also |
| 174 | * encoded in fs/proc/array.c: get_task_state(). |
| 175 | * |
| 176 | * We have two separate sets of flags: task->state |
| 177 | * is about runnability, while task->exit_state are |
| 178 | * about the task exiting. Confusing, but this way |
| 179 | * modifying one set can't modify the other one by |
| 180 | * mistake. |
| 181 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | #define TASK_RUNNING 0 |
| 183 | #define TASK_INTERRUPTIBLE 1 |
| 184 | #define TASK_UNINTERRUPTIBLE 2 |
Matthew Wilcox | f021a3c | 2007-12-06 11:13:16 -0500 | [diff] [blame] | 185 | #define __TASK_STOPPED 4 |
| 186 | #define __TASK_TRACED 8 |
Linus Torvalds | 4a8342d | 2005-09-29 15:18:21 -0700 | [diff] [blame] | 187 | /* in tsk->exit_state */ |
| 188 | #define EXIT_ZOMBIE 16 |
| 189 | #define EXIT_DEAD 32 |
| 190 | /* in tsk->state again */ |
Mike Galbraith | af92723 | 2007-10-15 17:00:13 +0200 | [diff] [blame] | 191 | #define TASK_DEAD 64 |
Matthew Wilcox | f021a3c | 2007-12-06 11:13:16 -0500 | [diff] [blame] | 192 | #define TASK_WAKEKILL 128 |
Peter Zijlstra | e9c8431 | 2009-09-15 14:43:03 +0200 | [diff] [blame] | 193 | #define TASK_WAKING 256 |
Peter Zijlstra | e178153 | 2009-12-17 13:16:30 +0100 | [diff] [blame] | 194 | #define TASK_STATE_MAX 512 |
Matthew Wilcox | f021a3c | 2007-12-06 11:13:16 -0500 | [diff] [blame] | 195 | |
Peter Zijlstra | 44d90df | 2009-12-17 13:16:28 +0100 | [diff] [blame] | 196 | #define TASK_STATE_TO_CHAR_STR "RSDTtZXxKW" |
Peter Zijlstra | 7334215 | 2009-12-17 13:16:27 +0100 | [diff] [blame] | 197 | |
Peter Zijlstra | e178153 | 2009-12-17 13:16:30 +0100 | [diff] [blame] | 198 | extern char ___assert_task_state[1 - 2*!!( |
| 199 | sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)]; |
Matthew Wilcox | f021a3c | 2007-12-06 11:13:16 -0500 | [diff] [blame] | 200 | |
| 201 | /* Convenience macros for the sake of set_task_state */ |
| 202 | #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE) |
| 203 | #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED) |
| 204 | #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | |
Matthew Wilcox | 92a1f4b | 2007-12-06 10:55:25 -0500 | [diff] [blame] | 206 | /* Convenience macros for the sake of wake_up */ |
| 207 | #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) |
Matthew Wilcox | f021a3c | 2007-12-06 11:13:16 -0500 | [diff] [blame] | 208 | #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED) |
Matthew Wilcox | 92a1f4b | 2007-12-06 10:55:25 -0500 | [diff] [blame] | 209 | |
| 210 | /* get_task_state() */ |
| 211 | #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \ |
Matthew Wilcox | f021a3c | 2007-12-06 11:13:16 -0500 | [diff] [blame] | 212 | TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ |
| 213 | __TASK_TRACED) |
Matthew Wilcox | 92a1f4b | 2007-12-06 10:55:25 -0500 | [diff] [blame] | 214 | |
Matthew Wilcox | f021a3c | 2007-12-06 11:13:16 -0500 | [diff] [blame] | 215 | #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0) |
| 216 | #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0) |
David Howells | 8f92054 | 2010-07-29 12:45:55 +0100 | [diff] [blame] | 217 | #define task_is_dead(task) ((task)->exit_state != 0) |
Matthew Wilcox | 92a1f4b | 2007-12-06 10:55:25 -0500 | [diff] [blame] | 218 | #define task_is_stopped_or_traced(task) \ |
Matthew Wilcox | f021a3c | 2007-12-06 11:13:16 -0500 | [diff] [blame] | 219 | ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0) |
Matthew Wilcox | 92a1f4b | 2007-12-06 10:55:25 -0500 | [diff] [blame] | 220 | #define task_contributes_to_load(task) \ |
Nathan Lynch | e3c8ca8 | 2009-04-08 19:45:12 -0500 | [diff] [blame] | 221 | ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \ |
Tejun Heo | 376fede | 2011-11-21 12:32:24 -0800 | [diff] [blame] | 222 | (task->flags & PF_FROZEN) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | |
| 224 | #define __set_task_state(tsk, state_value) \ |
| 225 | do { (tsk)->state = (state_value); } while (0) |
| 226 | #define set_task_state(tsk, state_value) \ |
| 227 | set_mb((tsk)->state, (state_value)) |
| 228 | |
Andrew Morton | 498d0c5 | 2005-09-13 01:25:14 -0700 | [diff] [blame] | 229 | /* |
| 230 | * set_current_state() includes a barrier so that the write of current->state |
| 231 | * is correctly serialised wrt the caller's subsequent test of whether to |
| 232 | * actually sleep: |
| 233 | * |
| 234 | * set_current_state(TASK_UNINTERRUPTIBLE); |
| 235 | * if (do_i_need_to_sleep()) |
| 236 | * schedule(); |
| 237 | * |
| 238 | * If the caller does not need such serialisation then use __set_current_state() |
| 239 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | #define __set_current_state(state_value) \ |
| 241 | do { current->state = (state_value); } while (0) |
| 242 | #define set_current_state(state_value) \ |
| 243 | set_mb(current->state, (state_value)) |
| 244 | |
| 245 | /* Task command name length */ |
| 246 | #define TASK_COMM_LEN 16 |
| 247 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | #include <linux/spinlock.h> |
| 249 | |
| 250 | /* |
| 251 | * This serializes "schedule()" and also protects |
| 252 | * the run-queue from deletions/modifications (but |
| 253 | * _adding_ to the beginning of the run-queue has |
| 254 | * a separate lock). |
| 255 | */ |
| 256 | extern rwlock_t tasklist_lock; |
| 257 | extern spinlock_t mmlist_lock; |
| 258 | |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 259 | struct task_struct; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | |
Paul E. McKenney | db1466b | 2010-03-03 07:46:56 -0800 | [diff] [blame] | 261 | #ifdef CONFIG_PROVE_RCU |
| 262 | extern int lockdep_tasklist_lock_is_held(void); |
| 263 | #endif /* #ifdef CONFIG_PROVE_RCU */ |
| 264 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | extern void sched_init(void); |
| 266 | extern void sched_init_smp(void); |
Harvey Harrison | 2d07b25 | 2008-02-15 09:56:34 -0800 | [diff] [blame] | 267 | extern asmlinkage void schedule_tail(struct task_struct *prev); |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 268 | extern void init_idle(struct task_struct *idle, int cpu); |
Ingo Molnar | 1df2105 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 269 | extern void init_idle_bootup_task(struct task_struct *idle); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | |
Andrew Morton | 89f19f0 | 2009-09-19 11:55:44 -0700 | [diff] [blame] | 271 | extern int runqueue_is_locked(int cpu); |
Ingo Molnar | 017730c | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 272 | |
Siddha, Suresh B | 46cb4b7 | 2007-05-08 00:32:51 -0700 | [diff] [blame] | 273 | #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ) |
Venkatesh Pallipadi | 83cd4fe | 2010-05-21 17:09:41 -0700 | [diff] [blame] | 274 | extern void select_nohz_load_balancer(int stop_tick); |
Suresh Siddha | 69e1e81 | 2011-12-01 17:07:33 -0800 | [diff] [blame] | 275 | extern void set_cpu_sd_state_idle(void); |
Venkatesh Pallipadi | 83cd4fe | 2010-05-21 17:09:41 -0700 | [diff] [blame] | 276 | extern int get_nohz_timer_target(void); |
Siddha, Suresh B | 46cb4b7 | 2007-05-08 00:32:51 -0700 | [diff] [blame] | 277 | #else |
Venkatesh Pallipadi | 83cd4fe | 2010-05-21 17:09:41 -0700 | [diff] [blame] | 278 | static inline void select_nohz_load_balancer(int stop_tick) { } |
Peter Zijlstra | fdaabd8 | 2011-12-06 12:47:55 +0100 | [diff] [blame] | 279 | static inline void set_cpu_sd_state_idle(void) { } |
Siddha, Suresh B | 46cb4b7 | 2007-05-08 00:32:51 -0700 | [diff] [blame] | 280 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | |
Ingo Molnar | e59e2ae | 2006-12-06 20:35:59 -0800 | [diff] [blame] | 282 | /* |
Ingo Molnar | 39bc89f | 2007-04-25 20:50:03 -0700 | [diff] [blame] | 283 | * Only dump TASK_* tasks. (0 for all tasks) |
Ingo Molnar | e59e2ae | 2006-12-06 20:35:59 -0800 | [diff] [blame] | 284 | */ |
| 285 | extern void show_state_filter(unsigned long state_filter); |
| 286 | |
| 287 | static inline void show_state(void) |
| 288 | { |
Ingo Molnar | 39bc89f | 2007-04-25 20:50:03 -0700 | [diff] [blame] | 289 | show_state_filter(0); |
Ingo Molnar | e59e2ae | 2006-12-06 20:35:59 -0800 | [diff] [blame] | 290 | } |
| 291 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | extern void show_regs(struct pt_regs *); |
| 293 | |
| 294 | /* |
| 295 | * TASK is a pointer to the task whose backtrace we want to see (or NULL for current |
| 296 | * task), SP is the stack pointer of the first frame that should be shown in the back |
| 297 | * trace (or NULL if the entire call-chain of the task should be shown). |
| 298 | */ |
| 299 | extern void show_stack(struct task_struct *task, unsigned long *sp); |
| 300 | |
| 301 | void io_schedule(void); |
| 302 | long io_schedule_timeout(long timeout); |
| 303 | |
| 304 | extern void cpu_init (void); |
| 305 | extern void trap_init(void); |
| 306 | extern void update_process_times(int user); |
| 307 | extern void scheduler_tick(void); |
| 308 | |
Ingo Molnar | 82a1fcb | 2008-01-25 21:08:02 +0100 | [diff] [blame] | 309 | extern void sched_show_task(struct task_struct *p); |
| 310 | |
Frederic Weisbecker | 19cc36c | 2010-05-13 02:30:49 +0200 | [diff] [blame] | 311 | #ifdef CONFIG_LOCKUP_DETECTOR |
Ingo Molnar | 8446f1d | 2005-09-06 15:16:27 -0700 | [diff] [blame] | 312 | extern void touch_softlockup_watchdog(void); |
Jason Wessel | d6ad3e2 | 2010-01-27 16:25:22 -0600 | [diff] [blame] | 313 | extern void touch_softlockup_watchdog_sync(void); |
Jeremy Fitzhardinge | 04c9167 | 2007-05-08 00:28:05 -0700 | [diff] [blame] | 314 | extern void touch_all_softlockup_watchdogs(void); |
Don Zickus | 332fbdb | 2010-05-07 17:11:45 -0400 | [diff] [blame] | 315 | extern int proc_dowatchdog_thresh(struct ctl_table *table, int write, |
| 316 | void __user *buffer, |
| 317 | size_t *lenp, loff_t *ppos); |
Ingo Molnar | 9c44bc0 | 2008-05-12 21:21:04 +0200 | [diff] [blame] | 318 | extern unsigned int softlockup_panic; |
Peter Zijlstra | 004417a | 2010-11-25 18:38:29 +0100 | [diff] [blame] | 319 | void lockup_detector_init(void); |
Ingo Molnar | 8446f1d | 2005-09-06 15:16:27 -0700 | [diff] [blame] | 320 | #else |
Ingo Molnar | 8446f1d | 2005-09-06 15:16:27 -0700 | [diff] [blame] | 321 | static inline void touch_softlockup_watchdog(void) |
| 322 | { |
| 323 | } |
Jason Wessel | d6ad3e2 | 2010-01-27 16:25:22 -0600 | [diff] [blame] | 324 | static inline void touch_softlockup_watchdog_sync(void) |
| 325 | { |
| 326 | } |
Jeremy Fitzhardinge | 04c9167 | 2007-05-08 00:28:05 -0700 | [diff] [blame] | 327 | static inline void touch_all_softlockup_watchdogs(void) |
| 328 | { |
| 329 | } |
Peter Zijlstra | 004417a | 2010-11-25 18:38:29 +0100 | [diff] [blame] | 330 | static inline void lockup_detector_init(void) |
| 331 | { |
| 332 | } |
Ingo Molnar | 8446f1d | 2005-09-06 15:16:27 -0700 | [diff] [blame] | 333 | #endif |
| 334 | |
Mandeep Singh Baines | e162b39 | 2009-01-15 11:08:40 -0800 | [diff] [blame] | 335 | #ifdef CONFIG_DETECT_HUNG_TASK |
| 336 | extern unsigned int sysctl_hung_task_panic; |
| 337 | extern unsigned long sysctl_hung_task_check_count; |
| 338 | extern unsigned long sysctl_hung_task_timeout_secs; |
| 339 | extern unsigned long sysctl_hung_task_warnings; |
| 340 | extern int proc_dohung_task_timeout_secs(struct ctl_table *table, int write, |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 341 | void __user *buffer, |
Mandeep Singh Baines | e162b39 | 2009-01-15 11:08:40 -0800 | [diff] [blame] | 342 | size_t *lenp, loff_t *ppos); |
Mark Lord | e4ecda1 | 2010-09-25 11:17:22 +0200 | [diff] [blame] | 343 | #else |
| 344 | /* Avoid need for ifdefs elsewhere in the code */ |
| 345 | enum { sysctl_hung_task_timeout_secs = 0 }; |
Mandeep Singh Baines | e162b39 | 2009-01-15 11:08:40 -0800 | [diff] [blame] | 346 | #endif |
Ingo Molnar | 8446f1d | 2005-09-06 15:16:27 -0700 | [diff] [blame] | 347 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | /* Attach to any functions which should be ignored in wchan output. */ |
| 349 | #define __sched __attribute__((__section__(".sched.text"))) |
Ingo Molnar | deaf222 | 2007-11-28 15:52:56 +0100 | [diff] [blame] | 350 | |
| 351 | /* Linker adds these: start and end of __sched functions */ |
| 352 | extern char __sched_text_start[], __sched_text_end[]; |
| 353 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | /* Is this address in the __sched functions? */ |
| 355 | extern int in_sched_functions(unsigned long addr); |
| 356 | |
| 357 | #define MAX_SCHEDULE_TIMEOUT LONG_MAX |
Harvey Harrison | b3c9752 | 2008-02-13 15:03:15 -0800 | [diff] [blame] | 358 | extern signed long schedule_timeout(signed long timeout); |
Nishanth Aravamudan | 64ed93a | 2005-09-10 00:27:21 -0700 | [diff] [blame] | 359 | extern signed long schedule_timeout_interruptible(signed long timeout); |
Matthew Wilcox | 294d5cc | 2007-12-06 11:59:46 -0500 | [diff] [blame] | 360 | extern signed long schedule_timeout_killable(signed long timeout); |
Nishanth Aravamudan | 64ed93a | 2005-09-10 00:27:21 -0700 | [diff] [blame] | 361 | extern signed long schedule_timeout_uninterruptible(signed long timeout); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | asmlinkage void schedule(void); |
Thomas Gleixner | c5491ea | 2011-03-21 12:09:35 +0100 | [diff] [blame] | 363 | extern void schedule_preempt_disabled(void); |
Peter Zijlstra | c6eb3dd | 2011-04-05 17:23:41 +0200 | [diff] [blame] | 364 | extern int mutex_spin_on_owner(struct mutex *lock, struct task_struct *owner); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | |
Serge E. Hallyn | ab51601 | 2006-10-02 02:18:06 -0700 | [diff] [blame] | 366 | struct nsproxy; |
Cedric Le Goater | acce292 | 2007-07-15 23:40:59 -0700 | [diff] [blame] | 367 | struct user_namespace; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | |
KAMEZAWA Hiroyuki | 341c87b | 2009-06-30 11:41:23 -0700 | [diff] [blame] | 369 | /* |
| 370 | * Default maximum number of active map areas, this limits the number of vmas |
| 371 | * per mm struct. Users can overwrite this number by sysctl but there is a |
| 372 | * problem. |
| 373 | * |
| 374 | * When a program's coredump is generated as ELF format, a section is created |
| 375 | * per a vma. In ELF, the number of sections is represented in unsigned short. |
| 376 | * This means the number of sections should be smaller than 65535 at coredump. |
| 377 | * Because the kernel adds some informative sections to a image of program at |
| 378 | * generating coredump, we need some margin. The number of extra sections is |
| 379 | * 1-3 now and depends on arch. We use "5" as safe margin, here. |
| 380 | */ |
| 381 | #define MAPCOUNT_ELF_CORE_MARGIN (5) |
Alexey Dobriyan | 4be929b | 2010-05-24 14:33:03 -0700 | [diff] [blame] | 382 | #define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | |
| 384 | extern int sysctl_max_map_count; |
| 385 | |
| 386 | #include <linux/aio.h> |
| 387 | |
David Howells | efc1a3b | 2010-01-15 17:01:35 -0800 | [diff] [blame] | 388 | #ifdef CONFIG_MMU |
| 389 | extern void arch_pick_mmap_layout(struct mm_struct *mm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | extern unsigned long |
| 391 | arch_get_unmapped_area(struct file *, unsigned long, unsigned long, |
| 392 | unsigned long, unsigned long); |
| 393 | extern unsigned long |
| 394 | arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, |
| 395 | unsigned long len, unsigned long pgoff, |
| 396 | unsigned long flags); |
Wolfgang Wander | 1363c3c | 2005-06-21 17:14:49 -0700 | [diff] [blame] | 397 | extern void arch_unmap_area(struct mm_struct *, unsigned long); |
| 398 | extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long); |
David Howells | efc1a3b | 2010-01-15 17:01:35 -0800 | [diff] [blame] | 399 | #else |
| 400 | static inline void arch_pick_mmap_layout(struct mm_struct *mm) {} |
| 401 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | |
Oleg Nesterov | 901608d | 2009-01-06 14:40:29 -0800 | [diff] [blame] | 403 | |
Kawai, Hidehiro | 6c5d523 | 2007-07-19 01:48:27 -0700 | [diff] [blame] | 404 | extern void set_dumpable(struct mm_struct *mm, int value); |
| 405 | extern int get_dumpable(struct mm_struct *mm); |
| 406 | |
| 407 | /* mm flags */ |
Kawai, Hidehiro | 3cb4a0b | 2007-07-19 01:48:28 -0700 | [diff] [blame] | 408 | /* dumpable bits */ |
Kawai, Hidehiro | 6c5d523 | 2007-07-19 01:48:27 -0700 | [diff] [blame] | 409 | #define MMF_DUMPABLE 0 /* core dump is permitted */ |
| 410 | #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */ |
Hugh Dickins | f8af4da | 2009-09-21 17:01:57 -0700 | [diff] [blame] | 411 | |
Kawai, Hidehiro | 3cb4a0b | 2007-07-19 01:48:28 -0700 | [diff] [blame] | 412 | #define MMF_DUMPABLE_BITS 2 |
Hugh Dickins | f8af4da | 2009-09-21 17:01:57 -0700 | [diff] [blame] | 413 | #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1) |
Kawai, Hidehiro | 3cb4a0b | 2007-07-19 01:48:28 -0700 | [diff] [blame] | 414 | |
| 415 | /* coredump filter bits */ |
| 416 | #define MMF_DUMP_ANON_PRIVATE 2 |
| 417 | #define MMF_DUMP_ANON_SHARED 3 |
| 418 | #define MMF_DUMP_MAPPED_PRIVATE 4 |
| 419 | #define MMF_DUMP_MAPPED_SHARED 5 |
Roland McGrath | 82df397 | 2007-10-16 23:27:02 -0700 | [diff] [blame] | 420 | #define MMF_DUMP_ELF_HEADERS 6 |
KOSAKI Motohiro | e575f11 | 2008-10-18 20:27:08 -0700 | [diff] [blame] | 421 | #define MMF_DUMP_HUGETLB_PRIVATE 7 |
| 422 | #define MMF_DUMP_HUGETLB_SHARED 8 |
Hugh Dickins | f8af4da | 2009-09-21 17:01:57 -0700 | [diff] [blame] | 423 | |
Kawai, Hidehiro | 3cb4a0b | 2007-07-19 01:48:28 -0700 | [diff] [blame] | 424 | #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS |
KOSAKI Motohiro | e575f11 | 2008-10-18 20:27:08 -0700 | [diff] [blame] | 425 | #define MMF_DUMP_FILTER_BITS 7 |
Kawai, Hidehiro | 3cb4a0b | 2007-07-19 01:48:28 -0700 | [diff] [blame] | 426 | #define MMF_DUMP_FILTER_MASK \ |
| 427 | (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT) |
| 428 | #define MMF_DUMP_FILTER_DEFAULT \ |
KOSAKI Motohiro | e575f11 | 2008-10-18 20:27:08 -0700 | [diff] [blame] | 429 | ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\ |
Roland McGrath | 656eb2c | 2008-10-18 20:28:23 -0700 | [diff] [blame] | 430 | (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF) |
| 431 | |
| 432 | #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS |
| 433 | # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS) |
| 434 | #else |
| 435 | # define MMF_DUMP_MASK_DEFAULT_ELF 0 |
| 436 | #endif |
Hugh Dickins | f8af4da | 2009-09-21 17:01:57 -0700 | [diff] [blame] | 437 | /* leave room for more dump flags */ |
| 438 | #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */ |
Andrea Arcangeli | ba76149 | 2011-01-13 15:46:58 -0800 | [diff] [blame] | 439 | #define MMF_VM_HUGEPAGE 17 /* set when VM_HUGEPAGE is set on vma */ |
Hugh Dickins | f8af4da | 2009-09-21 17:01:57 -0700 | [diff] [blame] | 440 | |
| 441 | #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK) |
Kawai, Hidehiro | 6c5d523 | 2007-07-19 01:48:27 -0700 | [diff] [blame] | 442 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | struct sighand_struct { |
| 444 | atomic_t count; |
| 445 | struct k_sigaction action[_NSIG]; |
| 446 | spinlock_t siglock; |
Davide Libenzi | b8fceee | 2007-09-20 12:40:16 -0700 | [diff] [blame] | 447 | wait_queue_head_t signalfd_wqh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | }; |
| 449 | |
KaiGai Kohei | 0e46481 | 2006-06-25 05:49:24 -0700 | [diff] [blame] | 450 | struct pacct_struct { |
KaiGai Kohei | f6ec29a | 2006-06-25 05:49:25 -0700 | [diff] [blame] | 451 | int ac_flag; |
| 452 | long ac_exitcode; |
KaiGai Kohei | 0e46481 | 2006-06-25 05:49:24 -0700 | [diff] [blame] | 453 | unsigned long ac_mem; |
KaiGai Kohei | 77787bf | 2006-06-25 05:49:26 -0700 | [diff] [blame] | 454 | cputime_t ac_utime, ac_stime; |
| 455 | unsigned long ac_minflt, ac_majflt; |
KaiGai Kohei | 0e46481 | 2006-06-25 05:49:24 -0700 | [diff] [blame] | 456 | }; |
| 457 | |
Stanislaw Gruszka | 42c4ab4 | 2009-07-29 12:15:26 +0200 | [diff] [blame] | 458 | struct cpu_itimer { |
| 459 | cputime_t expires; |
| 460 | cputime_t incr; |
Stanislaw Gruszka | 8356b5f | 2009-07-29 12:15:27 +0200 | [diff] [blame] | 461 | u32 error; |
| 462 | u32 incr_error; |
Stanislaw Gruszka | 42c4ab4 | 2009-07-29 12:15:26 +0200 | [diff] [blame] | 463 | }; |
| 464 | |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 465 | /** |
| 466 | * struct task_cputime - collected CPU time counts |
| 467 | * @utime: time spent in user mode, in &cputime_t units |
| 468 | * @stime: time spent in kernel mode, in &cputime_t units |
| 469 | * @sum_exec_runtime: total time spent on the CPU, in nanoseconds |
Ingo Molnar | 5ce73a4 | 2008-09-14 17:11:46 +0200 | [diff] [blame] | 470 | * |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 471 | * This structure groups together three kinds of CPU time that are |
| 472 | * tracked for threads and thread groups. Most things considering |
| 473 | * CPU time want to group these counts together and treat all three |
| 474 | * of them in parallel. |
| 475 | */ |
| 476 | struct task_cputime { |
| 477 | cputime_t utime; |
| 478 | cputime_t stime; |
| 479 | unsigned long long sum_exec_runtime; |
| 480 | }; |
| 481 | /* Alternate field names when used to cache expirations. */ |
| 482 | #define prof_exp stime |
| 483 | #define virt_exp utime |
| 484 | #define sched_exp sum_exec_runtime |
| 485 | |
Peter Zijlstra | 4cd4c1b | 2009-02-05 12:24:16 +0100 | [diff] [blame] | 486 | #define INIT_CPUTIME \ |
| 487 | (struct task_cputime) { \ |
Martin Schwidefsky | 6486163 | 2011-12-15 14:56:09 +0100 | [diff] [blame] | 488 | .utime = 0, \ |
| 489 | .stime = 0, \ |
Peter Zijlstra | 4cd4c1b | 2009-02-05 12:24:16 +0100 | [diff] [blame] | 490 | .sum_exec_runtime = 0, \ |
| 491 | } |
| 492 | |
Peter Zijlstra | c99e6ef | 2009-07-10 14:57:56 +0200 | [diff] [blame] | 493 | /* |
| 494 | * Disable preemption until the scheduler is running. |
| 495 | * Reset by start_kernel()->sched_init()->init_idle(). |
Peter Zijlstra | d86ee48 | 2009-07-10 14:57:57 +0200 | [diff] [blame] | 496 | * |
| 497 | * We include PREEMPT_ACTIVE to avoid cond_resched() from working |
| 498 | * before the scheduler is active -- see should_resched(). |
Peter Zijlstra | c99e6ef | 2009-07-10 14:57:56 +0200 | [diff] [blame] | 499 | */ |
Peter Zijlstra | d86ee48 | 2009-07-10 14:57:57 +0200 | [diff] [blame] | 500 | #define INIT_PREEMPT_COUNT (1 + PREEMPT_ACTIVE) |
Peter Zijlstra | c99e6ef | 2009-07-10 14:57:56 +0200 | [diff] [blame] | 501 | |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 502 | /** |
Peter Zijlstra | 4cd4c1b | 2009-02-05 12:24:16 +0100 | [diff] [blame] | 503 | * struct thread_group_cputimer - thread group interval timer counts |
| 504 | * @cputime: thread group interval timers. |
| 505 | * @running: non-zero when there are timers running and |
| 506 | * @cputime receives updates. |
| 507 | * @lock: lock for fields in this struct. |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 508 | * |
| 509 | * This structure contains the version of task_cputime, above, that is |
Peter Zijlstra | 4cd4c1b | 2009-02-05 12:24:16 +0100 | [diff] [blame] | 510 | * used for thread group CPU timer calculations. |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 511 | */ |
Peter Zijlstra | 4cd4c1b | 2009-02-05 12:24:16 +0100 | [diff] [blame] | 512 | struct thread_group_cputimer { |
| 513 | struct task_cputime cputime; |
| 514 | int running; |
Thomas Gleixner | ee30a7b | 2009-07-25 18:56:56 +0200 | [diff] [blame] | 515 | raw_spinlock_t lock; |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 516 | }; |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 517 | |
Ben Blum | 4714d1d | 2011-05-26 16:25:18 -0700 | [diff] [blame] | 518 | #include <linux/rwsem.h> |
Mike Galbraith | 5091faa | 2010-11-30 14:18:03 +0100 | [diff] [blame] | 519 | struct autogroup; |
| 520 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | /* |
Jonathan Neuschäfer | e815f0a | 2011-03-21 20:24:47 +0100 | [diff] [blame] | 522 | * NOTE! "signal_struct" does not have its own |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | * locking, because a shared signal_struct always |
| 524 | * implies a shared sighand_struct, so locking |
| 525 | * sighand_struct is always a proper superset of |
| 526 | * the locking of signal_struct. |
| 527 | */ |
| 528 | struct signal_struct { |
Oleg Nesterov | ea6d290 | 2010-05-26 14:43:16 -0700 | [diff] [blame] | 529 | atomic_t sigcnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | atomic_t live; |
Oleg Nesterov | b3ac022 | 2010-05-26 14:43:24 -0700 | [diff] [blame] | 531 | int nr_threads; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | |
| 533 | wait_queue_head_t wait_chldexit; /* for wait4() */ |
| 534 | |
| 535 | /* current thread group signal load-balancing target: */ |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 536 | struct task_struct *curr_target; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | |
| 538 | /* shared signal handling: */ |
| 539 | struct sigpending shared_pending; |
| 540 | |
| 541 | /* thread group exit support */ |
| 542 | int group_exit_code; |
| 543 | /* overloaded: |
| 544 | * - notify group_exit_task when ->count is equal to notify_count |
| 545 | * - everyone except group_exit_task is stopped during signal delivery |
| 546 | * of fatal signals, group_exit_task processes the signal. |
| 547 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | int notify_count; |
Richard Kennedy | 07dd20e | 2008-08-01 13:18:04 +0100 | [diff] [blame] | 549 | struct task_struct *group_exit_task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | |
| 551 | /* thread group stop support, overloads group_exit_code too */ |
| 552 | int group_stop_count; |
| 553 | unsigned int flags; /* see SIGNAL_* flags below */ |
| 554 | |
Lennart Poettering | ebec18a | 2012-03-23 15:01:54 -0700 | [diff] [blame] | 555 | /* |
| 556 | * PR_SET_CHILD_SUBREAPER marks a process, like a service |
| 557 | * manager, to re-parent orphan (double-forking) child processes |
| 558 | * to this process instead of 'init'. The service manager is |
| 559 | * able to receive SIGCHLD signals and is able to investigate |
| 560 | * the process until it calls wait(). All children of this |
| 561 | * process will inherit a flag if they should look for a |
| 562 | * child_subreaper process at exit. |
| 563 | */ |
| 564 | unsigned int is_child_subreaper:1; |
| 565 | unsigned int has_child_subreaper:1; |
| 566 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | /* POSIX.1b Interval Timers */ |
| 568 | struct list_head posix_timers; |
| 569 | |
| 570 | /* ITIMER_REAL timer for the process */ |
Thomas Gleixner | 2ff678b | 2006-01-09 20:52:34 -0800 | [diff] [blame] | 571 | struct hrtimer real_timer; |
Oleg Nesterov | fea9d17 | 2008-02-08 04:19:19 -0800 | [diff] [blame] | 572 | struct pid *leader_pid; |
Thomas Gleixner | 2ff678b | 2006-01-09 20:52:34 -0800 | [diff] [blame] | 573 | ktime_t it_real_incr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | |
Stanislaw Gruszka | 42c4ab4 | 2009-07-29 12:15:26 +0200 | [diff] [blame] | 575 | /* |
| 576 | * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use |
| 577 | * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these |
| 578 | * values are defined to 0 and 1 respectively |
| 579 | */ |
| 580 | struct cpu_itimer it[2]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 582 | /* |
Peter Zijlstra | 4cd4c1b | 2009-02-05 12:24:16 +0100 | [diff] [blame] | 583 | * Thread group totals for process CPU timers. |
| 584 | * See thread_group_cputimer(), et al, for details. |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 585 | */ |
Peter Zijlstra | 4cd4c1b | 2009-02-05 12:24:16 +0100 | [diff] [blame] | 586 | struct thread_group_cputimer cputimer; |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 587 | |
| 588 | /* Earliest-expiration cache. */ |
| 589 | struct task_cputime cputime_expires; |
| 590 | |
| 591 | struct list_head cpu_timers[3]; |
| 592 | |
Eric W. Biederman | ab521dc | 2007-02-12 00:53:00 -0800 | [diff] [blame] | 593 | struct pid *tty_old_pgrp; |
Cedric Le Goater | 1ec320a | 2006-12-08 02:37:55 -0800 | [diff] [blame] | 594 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | /* boolean value for session group leader */ |
| 596 | int leader; |
| 597 | |
| 598 | struct tty_struct *tty; /* NULL if no tty */ |
| 599 | |
Mike Galbraith | 5091faa | 2010-11-30 14:18:03 +0100 | [diff] [blame] | 600 | #ifdef CONFIG_SCHED_AUTOGROUP |
| 601 | struct autogroup *autogroup; |
| 602 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | /* |
| 604 | * Cumulative resource counters for dead threads in the group, |
| 605 | * and for reaped dead child processes forked by this group. |
| 606 | * Live threads maintain their own counters and add to these |
| 607 | * in __exit_signal, except for the group leader. |
| 608 | */ |
Peter Zijlstra | 32bd671 | 2009-02-05 12:24:15 +0100 | [diff] [blame] | 609 | cputime_t utime, stime, cutime, cstime; |
Laurent Vivier | 9ac5231 | 2007-10-15 17:00:19 +0200 | [diff] [blame] | 610 | cputime_t gtime; |
| 611 | cputime_t cgtime; |
Hidetoshi Seto | 0cf55e1 | 2009-12-02 17:28:07 +0900 | [diff] [blame] | 612 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING |
| 613 | cputime_t prev_utime, prev_stime; |
| 614 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; |
| 616 | unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; |
Eric Dumazet | 6eaeeab | 2007-05-10 22:22:37 -0700 | [diff] [blame] | 617 | unsigned long inblock, oublock, cinblock, coublock; |
Jiri Pirko | 1f10206 | 2009-09-22 16:44:10 -0700 | [diff] [blame] | 618 | unsigned long maxrss, cmaxrss; |
Andrea Righi | 940389b | 2008-07-28 00:48:12 +0200 | [diff] [blame] | 619 | struct task_io_accounting ioac; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | |
| 621 | /* |
Peter Zijlstra | 32bd671 | 2009-02-05 12:24:15 +0100 | [diff] [blame] | 622 | * Cumulative ns of schedule CPU time fo dead threads in the |
| 623 | * group, not including a zombie group leader, (This only differs |
| 624 | * from jiffies_to_ns(utime + stime) if sched_clock uses something |
| 625 | * other than jiffies.) |
| 626 | */ |
| 627 | unsigned long long sum_sched_runtime; |
| 628 | |
| 629 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | * We don't bother to synchronize most readers of this at all, |
| 631 | * because there is no reader checking a limit that actually needs |
| 632 | * to get both rlim_cur and rlim_max atomically, and either one |
| 633 | * alone is a single word that can safely be read normally. |
| 634 | * getrlimit/setrlimit use task_lock(current->group_leader) to |
| 635 | * protect this instead of the siglock, because they really |
| 636 | * have no need to disable irqs. |
| 637 | */ |
| 638 | struct rlimit rlim[RLIM_NLIMITS]; |
| 639 | |
KaiGai Kohei | 0e46481 | 2006-06-25 05:49:24 -0700 | [diff] [blame] | 640 | #ifdef CONFIG_BSD_PROCESS_ACCT |
| 641 | struct pacct_struct pacct; /* per-process accounting information */ |
| 642 | #endif |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 643 | #ifdef CONFIG_TASKSTATS |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 644 | struct taskstats *stats; |
| 645 | #endif |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 646 | #ifdef CONFIG_AUDIT |
| 647 | unsigned audit_tty; |
| 648 | struct tty_audit_buf *tty_audit_buf; |
| 649 | #endif |
Ben Blum | 4714d1d | 2011-05-26 16:25:18 -0700 | [diff] [blame] | 650 | #ifdef CONFIG_CGROUPS |
| 651 | /* |
Tejun Heo | 77e4ef9 | 2011-12-12 18:12:21 -0800 | [diff] [blame] | 652 | * group_rwsem prevents new tasks from entering the threadgroup and |
| 653 | * member tasks from exiting,a more specifically, setting of |
| 654 | * PF_EXITING. fork and exit paths are protected with this rwsem |
| 655 | * using threadgroup_change_begin/end(). Users which require |
| 656 | * threadgroup to remain stable should use threadgroup_[un]lock() |
| 657 | * which also takes care of exec path. Currently, cgroup is the |
| 658 | * only user. |
Ben Blum | 4714d1d | 2011-05-26 16:25:18 -0700 | [diff] [blame] | 659 | */ |
Tejun Heo | 257058a | 2011-12-12 18:12:21 -0800 | [diff] [blame] | 660 | struct rw_semaphore group_rwsem; |
Ben Blum | 4714d1d | 2011-05-26 16:25:18 -0700 | [diff] [blame] | 661 | #endif |
KOSAKI Motohiro | 28b83c5 | 2009-09-21 17:03:13 -0700 | [diff] [blame] | 662 | |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 663 | int oom_adj; /* OOM kill score adjustment (bit shift) */ |
| 664 | int oom_score_adj; /* OOM kill score adjustment */ |
Mandeep Singh Baines | dabb16f | 2011-01-13 15:46:05 -0800 | [diff] [blame] | 665 | int oom_score_adj_min; /* OOM kill score adjustment minimum value. |
| 666 | * Only settable by CAP_SYS_RESOURCE. */ |
KOSAKI Motohiro | 9b1bf12 | 2010-10-27 15:34:08 -0700 | [diff] [blame] | 667 | |
| 668 | struct mutex cred_guard_mutex; /* guard against foreign influences on |
| 669 | * credential calculations |
| 670 | * (notably. ptrace) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | }; |
| 672 | |
Nick Piggin | 4866cde | 2005-06-25 14:57:23 -0700 | [diff] [blame] | 673 | /* Context switch must be unlocked if interrupts are to be enabled */ |
| 674 | #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW |
| 675 | # define __ARCH_WANT_UNLOCKED_CTXSW |
| 676 | #endif |
| 677 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | /* |
| 679 | * Bits in flags field of signal_struct. |
| 680 | */ |
| 681 | #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ |
Oleg Nesterov | ee77f07 | 2011-04-01 20:12:38 +0200 | [diff] [blame] | 682 | #define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */ |
| 683 | #define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */ |
Oleg Nesterov | e442055 | 2008-04-30 00:52:44 -0700 | [diff] [blame] | 684 | /* |
| 685 | * Pending notifications to parent. |
| 686 | */ |
| 687 | #define SIGNAL_CLD_STOPPED 0x00000010 |
| 688 | #define SIGNAL_CLD_CONTINUED 0x00000020 |
| 689 | #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | |
Oleg Nesterov | fae5fa4 | 2008-04-30 00:53:03 -0700 | [diff] [blame] | 691 | #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */ |
| 692 | |
Oleg Nesterov | ed5d2ca | 2008-02-04 22:27:24 -0800 | [diff] [blame] | 693 | /* If true, all threads except ->group_exit_task have pending SIGKILL */ |
| 694 | static inline int signal_group_exit(const struct signal_struct *sig) |
| 695 | { |
| 696 | return (sig->flags & SIGNAL_GROUP_EXIT) || |
| 697 | (sig->group_exit_task != NULL); |
| 698 | } |
| 699 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | /* |
| 701 | * Some day this will be a full-fledged user tracking system.. |
| 702 | */ |
| 703 | struct user_struct { |
| 704 | atomic_t __count; /* reference count */ |
| 705 | atomic_t processes; /* How many processes does this user have? */ |
| 706 | atomic_t files; /* How many open files does this user have? */ |
| 707 | atomic_t sigpending; /* How many pending signals does this user have? */ |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 708 | #ifdef CONFIG_INOTIFY_USER |
Robert Love | 0eeca28 | 2005-07-12 17:06:03 -0400 | [diff] [blame] | 709 | atomic_t inotify_watches; /* How many inotify watches does this user have? */ |
| 710 | atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ |
| 711 | #endif |
Eric Paris | 4afeff8 | 2010-10-28 17:21:58 -0400 | [diff] [blame] | 712 | #ifdef CONFIG_FANOTIFY |
| 713 | atomic_t fanotify_listeners; |
| 714 | #endif |
Davide Libenzi | 7ef9964 | 2008-12-01 13:13:55 -0800 | [diff] [blame] | 715 | #ifdef CONFIG_EPOLL |
Robin Holt | 52bd19f7 | 2011-01-12 17:00:01 -0800 | [diff] [blame] | 716 | atomic_long_t epoll_watches; /* The number of file descriptors currently watched */ |
Davide Libenzi | 7ef9964 | 2008-12-01 13:13:55 -0800 | [diff] [blame] | 717 | #endif |
Alexey Dobriyan | 970a864 | 2007-10-16 23:30:09 -0700 | [diff] [blame] | 718 | #ifdef CONFIG_POSIX_MQUEUE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | /* protected by mq_lock */ |
| 720 | unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ |
Alexey Dobriyan | 970a864 | 2007-10-16 23:30:09 -0700 | [diff] [blame] | 721 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | unsigned long locked_shm; /* How many pages of mlocked shm ? */ |
| 723 | |
| 724 | #ifdef CONFIG_KEYS |
| 725 | struct key *uid_keyring; /* UID specific keyring */ |
| 726 | struct key *session_keyring; /* UID's default session keyring */ |
| 727 | #endif |
| 728 | |
| 729 | /* Hash table maintenance information */ |
Pavel Emelyanov | 735de22 | 2007-09-18 22:46:44 -0700 | [diff] [blame] | 730 | struct hlist_node uidhash_node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | uid_t uid; |
Serge Hallyn | 18b6e04 | 2008-10-15 16:38:45 -0500 | [diff] [blame] | 732 | struct user_namespace *user_ns; |
Srivatsa Vaddagiri | 24e377a | 2007-10-15 17:00:09 +0200 | [diff] [blame] | 733 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 734 | #ifdef CONFIG_PERF_EVENTS |
Peter Zijlstra | 789f90f | 2009-05-15 15:19:27 +0200 | [diff] [blame] | 735 | atomic_long_t locked_vm; |
| 736 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | }; |
| 738 | |
Kay Sievers | eb41d94 | 2007-11-02 13:47:53 +0100 | [diff] [blame] | 739 | extern int uids_sysfs_init(void); |
Dhaval Giani | 5cb350b | 2007-10-15 17:00:14 +0200 | [diff] [blame] | 740 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | extern struct user_struct *find_user(uid_t); |
| 742 | |
| 743 | extern struct user_struct root_user; |
| 744 | #define INIT_USER (&root_user) |
| 745 | |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 746 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | struct backing_dev_info; |
| 748 | struct reclaim_state; |
| 749 | |
Chandra Seetharaman | 52f17b6 | 2006-07-14 00:24:38 -0700 | [diff] [blame] | 750 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | struct sched_info { |
| 752 | /* cumulative counters */ |
Ingo Molnar | 2d72376 | 2007-10-15 17:00:12 +0200 | [diff] [blame] | 753 | unsigned long pcount; /* # of times run on this cpu */ |
Ken Chen | 9c2c480 | 2008-12-16 23:41:22 -0800 | [diff] [blame] | 754 | unsigned long long run_delay; /* time spent waiting on a runqueue */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | |
| 756 | /* timestamps */ |
Balbir Singh | 172ba84 | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 757 | unsigned long long last_arrival,/* when we last ran on a cpu */ |
| 758 | last_queued; /* when we were last queued to run */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | }; |
Chandra Seetharaman | 52f17b6 | 2006-07-14 00:24:38 -0700 | [diff] [blame] | 760 | #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 762 | #ifdef CONFIG_TASK_DELAY_ACCT |
| 763 | struct task_delay_info { |
| 764 | spinlock_t lock; |
| 765 | unsigned int flags; /* Private per-task flags */ |
| 766 | |
| 767 | /* For each stat XXX, add following, aligned appropriately |
| 768 | * |
| 769 | * struct timespec XXX_start, XXX_end; |
| 770 | * u64 XXX_delay; |
| 771 | * u32 XXX_count; |
| 772 | * |
| 773 | * Atomicity of updates to XXX_delay, XXX_count protected by |
| 774 | * single lock above (split into XXX_lock if contention is an issue). |
| 775 | */ |
Shailabh Nagar | 0ff9224 | 2006-07-14 00:24:37 -0700 | [diff] [blame] | 776 | |
| 777 | /* |
| 778 | * XXX_count is incremented on every XXX operation, the delay |
| 779 | * associated with the operation is added to XXX_delay. |
| 780 | * XXX_delay contains the accumulated delay time in nanoseconds. |
| 781 | */ |
| 782 | struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */ |
| 783 | u64 blkio_delay; /* wait for sync block io completion */ |
| 784 | u64 swapin_delay; /* wait for swapin block io completion */ |
| 785 | u32 blkio_count; /* total count of the number of sync block */ |
| 786 | /* io operations performed */ |
| 787 | u32 swapin_count; /* total count of the number of swapin block */ |
| 788 | /* io operations performed */ |
Keika Kobayashi | 873b477 | 2008-07-25 01:48:52 -0700 | [diff] [blame] | 789 | |
| 790 | struct timespec freepages_start, freepages_end; |
| 791 | u64 freepages_delay; /* wait for memory reclaim */ |
| 792 | u32 freepages_count; /* total count of memory reclaim */ |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 793 | }; |
Chandra Seetharaman | 52f17b6 | 2006-07-14 00:24:38 -0700 | [diff] [blame] | 794 | #endif /* CONFIG_TASK_DELAY_ACCT */ |
| 795 | |
| 796 | static inline int sched_info_on(void) |
| 797 | { |
| 798 | #ifdef CONFIG_SCHEDSTATS |
| 799 | return 1; |
| 800 | #elif defined(CONFIG_TASK_DELAY_ACCT) |
| 801 | extern int delayacct_on; |
| 802 | return delayacct_on; |
| 803 | #else |
| 804 | return 0; |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 805 | #endif |
Chandra Seetharaman | 52f17b6 | 2006-07-14 00:24:38 -0700 | [diff] [blame] | 806 | } |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 807 | |
Ingo Molnar | d15bcfd | 2007-07-09 18:51:57 +0200 | [diff] [blame] | 808 | enum cpu_idle_type { |
| 809 | CPU_IDLE, |
| 810 | CPU_NOT_IDLE, |
| 811 | CPU_NEWLY_IDLE, |
| 812 | CPU_MAX_IDLE_TYPES |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | }; |
| 814 | |
| 815 | /* |
Nikhil Rao | c8b2811 | 2011-05-18 14:37:48 -0700 | [diff] [blame] | 816 | * Increase resolution of nice-level calculations for 64-bit architectures. |
| 817 | * The extra resolution improves shares distribution and load balancing of |
| 818 | * low-weight task groups (eg. nice +19 on an autogroup), deeper taskgroup |
| 819 | * hierarchies, especially on larger systems. This is not a user-visible change |
| 820 | * and does not change the user-interface for setting shares/weights. |
| 821 | * |
| 822 | * We increase resolution only if we have enough bits to allow this increased |
| 823 | * resolution (i.e. BITS_PER_LONG > 32). The costs for increasing resolution |
| 824 | * when BITS_PER_LONG <= 32 are pretty high and the returns do not justify the |
| 825 | * increased costs. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | */ |
Peter Zijlstra | e4c2fb0 | 2011-07-05 10:56:32 +0200 | [diff] [blame] | 827 | #if 0 /* BITS_PER_LONG > 32 -- currently broken: it increases power usage under light load */ |
Nikhil Rao | c8b2811 | 2011-05-18 14:37:48 -0700 | [diff] [blame] | 828 | # define SCHED_LOAD_RESOLUTION 10 |
| 829 | # define scale_load(w) ((w) << SCHED_LOAD_RESOLUTION) |
| 830 | # define scale_load_down(w) ((w) >> SCHED_LOAD_RESOLUTION) |
| 831 | #else |
| 832 | # define SCHED_LOAD_RESOLUTION 0 |
| 833 | # define scale_load(w) (w) |
| 834 | # define scale_load_down(w) (w) |
| 835 | #endif |
Ingo Molnar | 9aa7b36 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 836 | |
Nikhil Rao | c8b2811 | 2011-05-18 14:37:48 -0700 | [diff] [blame] | 837 | #define SCHED_LOAD_SHIFT (10 + SCHED_LOAD_RESOLUTION) |
Ingo Molnar | 9aa7b36 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 838 | #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT) |
| 839 | |
Nikhil Rao | 1399fa7 | 2011-05-18 10:09:39 -0700 | [diff] [blame] | 840 | /* |
| 841 | * Increase resolution of cpu_power calculations |
| 842 | */ |
| 843 | #define SCHED_POWER_SHIFT 10 |
| 844 | #define SCHED_POWER_SCALE (1L << SCHED_POWER_SHIFT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | |
Nikhil Rao | 1399fa7 | 2011-05-18 10:09:39 -0700 | [diff] [blame] | 846 | /* |
| 847 | * sched-domains (multiprocessor balancing) declarations: |
| 848 | */ |
Peter Williams | 2dd73a4 | 2006-06-27 02:54:34 -0700 | [diff] [blame] | 849 | #ifdef CONFIG_SMP |
Peter Zijlstra | b5d978e | 2009-09-01 10:34:33 +0200 | [diff] [blame] | 850 | #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */ |
| 851 | #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */ |
| 852 | #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */ |
| 853 | #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */ |
Peter Zijlstra | c88d591 | 2009-09-10 13:50:02 +0200 | [diff] [blame] | 854 | #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */ |
Peter Zijlstra | b5d978e | 2009-09-01 10:34:33 +0200 | [diff] [blame] | 855 | #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */ |
Peter Zijlstra | 59abf02 | 2009-09-16 08:28:30 +0200 | [diff] [blame] | 856 | #define SD_PREFER_LOCAL 0x0040 /* Prefer to keep tasks local to this domain */ |
Peter Zijlstra | b5d978e | 2009-09-01 10:34:33 +0200 | [diff] [blame] | 857 | #define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */ |
| 858 | #define SD_POWERSAVINGS_BALANCE 0x0100 /* Balance for power savings */ |
| 859 | #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */ |
| 860 | #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */ |
Michael Neuling | 532cb4c | 2010-06-08 14:57:02 +1000 | [diff] [blame] | 861 | #define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */ |
Peter Zijlstra | b5d978e | 2009-09-01 10:34:33 +0200 | [diff] [blame] | 862 | #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */ |
Peter Zijlstra | e3589f6 | 2011-07-15 10:35:52 +0200 | [diff] [blame] | 863 | #define SD_OVERLAP 0x2000 /* sched_domains of this level overlap */ |
Siddha, Suresh B | 5c45bf2 | 2006-06-27 02:54:42 -0700 | [diff] [blame] | 864 | |
Gautham R Shenoy | afb8a9b | 2008-12-18 23:26:09 +0530 | [diff] [blame] | 865 | enum powersavings_balance_level { |
| 866 | POWERSAVINGS_BALANCE_NONE = 0, /* No power saving load balance */ |
| 867 | POWERSAVINGS_BALANCE_BASIC, /* Fill one thread/core/package |
| 868 | * first for long running threads |
| 869 | */ |
| 870 | POWERSAVINGS_BALANCE_WAKEUP, /* Also bias task wakeups to semi-idle |
| 871 | * cpu package for power savings |
| 872 | */ |
| 873 | MAX_POWERSAVINGS_BALANCE_LEVELS |
| 874 | }; |
Siddha, Suresh B | 89c4710 | 2006-10-03 01:14:09 -0700 | [diff] [blame] | 875 | |
Vaidyanathan Srinivasan | 716707b | 2008-12-18 23:26:02 +0530 | [diff] [blame] | 876 | extern int sched_mc_power_savings, sched_smt_power_savings; |
Siddha, Suresh B | 89c4710 | 2006-10-03 01:14:09 -0700 | [diff] [blame] | 877 | |
Vaidyanathan Srinivasan | 716707b | 2008-12-18 23:26:02 +0530 | [diff] [blame] | 878 | static inline int sd_balance_for_mc_power(void) |
| 879 | { |
| 880 | if (sched_smt_power_savings) |
| 881 | return SD_POWERSAVINGS_BALANCE; |
Siddha, Suresh B | 5c45bf2 | 2006-06-27 02:54:42 -0700 | [diff] [blame] | 882 | |
Vaidyanathan Srinivasan | 28f5318 | 2010-02-08 15:35:55 +0530 | [diff] [blame] | 883 | if (!sched_mc_power_savings) |
| 884 | return SD_PREFER_SIBLING; |
| 885 | |
| 886 | return 0; |
Vaidyanathan Srinivasan | 716707b | 2008-12-18 23:26:02 +0530 | [diff] [blame] | 887 | } |
| 888 | |
| 889 | static inline int sd_balance_for_package_power(void) |
| 890 | { |
| 891 | if (sched_mc_power_savings | sched_smt_power_savings) |
| 892 | return SD_POWERSAVINGS_BALANCE; |
| 893 | |
Peter Zijlstra | b5d978e | 2009-09-01 10:34:33 +0200 | [diff] [blame] | 894 | return SD_PREFER_SIBLING; |
Vaidyanathan Srinivasan | 716707b | 2008-12-18 23:26:02 +0530 | [diff] [blame] | 895 | } |
Nick Piggin | 147cbb4 | 2005-06-25 14:57:19 -0700 | [diff] [blame] | 896 | |
Michael Neuling | 532cb4c | 2010-06-08 14:57:02 +1000 | [diff] [blame] | 897 | extern int __weak arch_sd_sibiling_asym_packing(void); |
| 898 | |
Vaidyanathan Srinivasan | 100fdae | 2008-12-18 23:26:47 +0530 | [diff] [blame] | 899 | /* |
| 900 | * Optimise SD flags for power savings: |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 901 | * SD_BALANCE_NEWIDLE helps aggressive task consolidation and power savings. |
Vaidyanathan Srinivasan | 100fdae | 2008-12-18 23:26:47 +0530 | [diff] [blame] | 902 | * Keep default SD flags if sched_{smt,mc}_power_saving=0 |
| 903 | */ |
| 904 | |
| 905 | static inline int sd_power_saving_flags(void) |
| 906 | { |
| 907 | if (sched_mc_power_savings | sched_smt_power_savings) |
| 908 | return SD_BALANCE_NEWIDLE; |
| 909 | |
| 910 | return 0; |
| 911 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | |
Peter Zijlstra | 9c3f75c | 2011-07-14 13:00:06 +0200 | [diff] [blame] | 913 | struct sched_group_power { |
Peter Zijlstra | e3589f6 | 2011-07-15 10:35:52 +0200 | [diff] [blame] | 914 | atomic_t ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | /* |
| 916 | * CPU power of this group, SCHED_LOAD_SCALE being max power for a |
Peter Zijlstra | 18a3885 | 2009-09-01 10:34:39 +0200 | [diff] [blame] | 917 | * single CPU. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | */ |
Peter Zijlstra | 9c3f75c | 2011-07-14 13:00:06 +0200 | [diff] [blame] | 919 | unsigned int power, power_orig; |
Vincent Guittot | 4ec4412 | 2011-12-12 20:21:08 +0100 | [diff] [blame] | 920 | unsigned long next_update; |
Suresh Siddha | 69e1e81 | 2011-12-01 17:07:33 -0800 | [diff] [blame] | 921 | /* |
| 922 | * Number of busy cpus in this group. |
| 923 | */ |
| 924 | atomic_t nr_busy_cpus; |
Peter Zijlstra | 9c3f75c | 2011-07-14 13:00:06 +0200 | [diff] [blame] | 925 | }; |
| 926 | |
| 927 | struct sched_group { |
| 928 | struct sched_group *next; /* Must be a circular list */ |
| 929 | atomic_t ref; |
| 930 | |
Suresh Siddha | aae6d3d | 2010-09-17 15:02:32 -0700 | [diff] [blame] | 931 | unsigned int group_weight; |
Peter Zijlstra | 9c3f75c | 2011-07-14 13:00:06 +0200 | [diff] [blame] | 932 | struct sched_group_power *sgp; |
Rusty Russell | 6c99e9a | 2008-11-25 02:35:04 +1030 | [diff] [blame] | 933 | |
Ingo Molnar | 4200efd | 2009-05-19 09:22:19 +0200 | [diff] [blame] | 934 | /* |
| 935 | * The CPUs this group covers. |
| 936 | * |
| 937 | * NOTE: this field is variable length. (Allocated dynamically |
| 938 | * by attaching extra space to the end of the structure, |
| 939 | * depending on how many CPUs the kernel has booted up with) |
Ingo Molnar | 4200efd | 2009-05-19 09:22:19 +0200 | [diff] [blame] | 940 | */ |
| 941 | unsigned long cpumask[0]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | }; |
| 943 | |
Rusty Russell | 758b2cd | 2008-11-25 02:35:04 +1030 | [diff] [blame] | 944 | static inline struct cpumask *sched_group_cpus(struct sched_group *sg) |
| 945 | { |
Rusty Russell | 6c99e9a | 2008-11-25 02:35:04 +1030 | [diff] [blame] | 946 | return to_cpumask(sg->cpumask); |
Rusty Russell | 758b2cd | 2008-11-25 02:35:04 +1030 | [diff] [blame] | 947 | } |
| 948 | |
Peter Zijlstra | 029632f | 2011-10-25 10:00:11 +0200 | [diff] [blame] | 949 | /** |
| 950 | * group_first_cpu - Returns the first cpu in the cpumask of a sched_group. |
| 951 | * @group: The group whose first cpu is to be returned. |
| 952 | */ |
| 953 | static inline unsigned int group_first_cpu(struct sched_group *group) |
| 954 | { |
| 955 | return cpumask_first(sched_group_cpus(group)); |
| 956 | } |
| 957 | |
Hidetoshi Seto | 1d3504f | 2008-04-15 14:04:23 +0900 | [diff] [blame] | 958 | struct sched_domain_attr { |
| 959 | int relax_domain_level; |
| 960 | }; |
| 961 | |
| 962 | #define SD_ATTR_INIT (struct sched_domain_attr) { \ |
| 963 | .relax_domain_level = -1, \ |
| 964 | } |
| 965 | |
Peter Zijlstra | 60495e7 | 2011-04-07 14:10:04 +0200 | [diff] [blame] | 966 | extern int sched_domain_level_max; |
| 967 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | struct sched_domain { |
| 969 | /* These fields must be setup */ |
| 970 | struct sched_domain *parent; /* top domain must be null terminated */ |
Siddha, Suresh B | 1a84887 | 2006-10-03 01:14:08 -0700 | [diff] [blame] | 971 | struct sched_domain *child; /* bottom domain must be null terminated */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | struct sched_group *groups; /* the balancing groups of the domain */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | unsigned long min_interval; /* Minimum balance interval ms */ |
| 974 | unsigned long max_interval; /* Maximum balance interval ms */ |
| 975 | unsigned int busy_factor; /* less balancing by factor if busy */ |
| 976 | unsigned int imbalance_pct; /* No balance until over watermark */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ |
Nick Piggin | 7897986 | 2005-06-25 14:57:13 -0700 | [diff] [blame] | 978 | unsigned int busy_idx; |
| 979 | unsigned int idle_idx; |
| 980 | unsigned int newidle_idx; |
| 981 | unsigned int wake_idx; |
Nick Piggin | 147cbb4 | 2005-06-25 14:57:19 -0700 | [diff] [blame] | 982 | unsigned int forkexec_idx; |
Peter Zijlstra | a52bfd73 | 2009-09-01 10:34:35 +0200 | [diff] [blame] | 983 | unsigned int smt_gain; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | int flags; /* See SD_* */ |
Peter Zijlstra | 60495e7 | 2011-04-07 14:10:04 +0200 | [diff] [blame] | 985 | int level; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 986 | |
| 987 | /* Runtime fields. */ |
| 988 | unsigned long last_balance; /* init to jiffies. units in jiffies */ |
| 989 | unsigned int balance_interval; /* initialise to 1. units in ms. */ |
| 990 | unsigned int nr_balance_failed; /* initialise to 0 */ |
| 991 | |
Peter Zijlstra | 2398f2c | 2008-06-27 13:41:35 +0200 | [diff] [blame] | 992 | u64 last_update; |
| 993 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | #ifdef CONFIG_SCHEDSTATS |
| 995 | /* load_balance() stats */ |
Ken Chen | 480b943 | 2007-10-18 21:32:56 +0200 | [diff] [blame] | 996 | unsigned int lb_count[CPU_MAX_IDLE_TYPES]; |
| 997 | unsigned int lb_failed[CPU_MAX_IDLE_TYPES]; |
| 998 | unsigned int lb_balanced[CPU_MAX_IDLE_TYPES]; |
| 999 | unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES]; |
| 1000 | unsigned int lb_gained[CPU_MAX_IDLE_TYPES]; |
| 1001 | unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; |
| 1002 | unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; |
| 1003 | unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | |
| 1005 | /* Active load balancing */ |
Ken Chen | 480b943 | 2007-10-18 21:32:56 +0200 | [diff] [blame] | 1006 | unsigned int alb_count; |
| 1007 | unsigned int alb_failed; |
| 1008 | unsigned int alb_pushed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1009 | |
Nick Piggin | 68767a0 | 2005-06-25 14:57:20 -0700 | [diff] [blame] | 1010 | /* SD_BALANCE_EXEC stats */ |
Ken Chen | 480b943 | 2007-10-18 21:32:56 +0200 | [diff] [blame] | 1011 | unsigned int sbe_count; |
| 1012 | unsigned int sbe_balanced; |
| 1013 | unsigned int sbe_pushed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | |
Nick Piggin | 68767a0 | 2005-06-25 14:57:20 -0700 | [diff] [blame] | 1015 | /* SD_BALANCE_FORK stats */ |
Ken Chen | 480b943 | 2007-10-18 21:32:56 +0200 | [diff] [blame] | 1016 | unsigned int sbf_count; |
| 1017 | unsigned int sbf_balanced; |
| 1018 | unsigned int sbf_pushed; |
Nick Piggin | 68767a0 | 2005-06-25 14:57:20 -0700 | [diff] [blame] | 1019 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | /* try_to_wake_up() stats */ |
Ken Chen | 480b943 | 2007-10-18 21:32:56 +0200 | [diff] [blame] | 1021 | unsigned int ttwu_wake_remote; |
| 1022 | unsigned int ttwu_move_affine; |
| 1023 | unsigned int ttwu_move_balance; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | #endif |
Ingo Molnar | a5d8c34 | 2008-10-09 11:35:51 +0200 | [diff] [blame] | 1025 | #ifdef CONFIG_SCHED_DEBUG |
| 1026 | char *name; |
| 1027 | #endif |
Peter Zijlstra | dce840a | 2011-04-07 14:09:50 +0200 | [diff] [blame] | 1028 | union { |
| 1029 | void *private; /* used during construction */ |
| 1030 | struct rcu_head rcu; /* used during destruction */ |
| 1031 | }; |
Rusty Russell | 6c99e9a | 2008-11-25 02:35:04 +1030 | [diff] [blame] | 1032 | |
Peter Zijlstra | 669c55e | 2010-04-16 14:59:29 +0200 | [diff] [blame] | 1033 | unsigned int span_weight; |
Ingo Molnar | 4200efd | 2009-05-19 09:22:19 +0200 | [diff] [blame] | 1034 | /* |
| 1035 | * Span of all CPUs in this domain. |
| 1036 | * |
| 1037 | * NOTE: this field is variable length. (Allocated dynamically |
| 1038 | * by attaching extra space to the end of the structure, |
| 1039 | * depending on how many CPUs the kernel has booted up with) |
Ingo Molnar | 4200efd | 2009-05-19 09:22:19 +0200 | [diff] [blame] | 1040 | */ |
| 1041 | unsigned long span[0]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | }; |
| 1043 | |
Rusty Russell | 758b2cd | 2008-11-25 02:35:04 +1030 | [diff] [blame] | 1044 | static inline struct cpumask *sched_domain_span(struct sched_domain *sd) |
| 1045 | { |
Rusty Russell | 6c99e9a | 2008-11-25 02:35:04 +1030 | [diff] [blame] | 1046 | return to_cpumask(sd->span); |
Rusty Russell | 758b2cd | 2008-11-25 02:35:04 +1030 | [diff] [blame] | 1047 | } |
| 1048 | |
Rusty Russell | acc3f5d | 2009-11-03 14:53:40 +1030 | [diff] [blame] | 1049 | extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], |
Hidetoshi Seto | 1d3504f | 2008-04-15 14:04:23 +0900 | [diff] [blame] | 1050 | struct sched_domain_attr *dattr_new); |
Paul Jackson | 029190c | 2007-10-18 23:40:20 -0700 | [diff] [blame] | 1051 | |
Rusty Russell | acc3f5d | 2009-11-03 14:53:40 +1030 | [diff] [blame] | 1052 | /* Allocate an array of sched domains, for partition_sched_domains(). */ |
| 1053 | cpumask_var_t *alloc_sched_domains(unsigned int ndoms); |
| 1054 | void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms); |
| 1055 | |
Ingo Molnar | 06aaf76 | 2008-12-18 21:30:23 +0100 | [diff] [blame] | 1056 | /* Test a flag in parent sched domain */ |
| 1057 | static inline int test_sd_parent(struct sched_domain *sd, int flag) |
| 1058 | { |
| 1059 | if (sd->parent && (sd->parent->flags & flag)) |
| 1060 | return 1; |
| 1061 | |
| 1062 | return 0; |
| 1063 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1064 | |
Peter Zijlstra | 47fe38f | 2009-09-02 13:49:18 +0200 | [diff] [blame] | 1065 | unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu); |
| 1066 | unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu); |
| 1067 | |
Peter Zijlstra | 39be350 | 2012-01-26 12:44:34 +0100 | [diff] [blame] | 1068 | bool cpus_share_cache(int this_cpu, int that_cpu); |
| 1069 | |
Ingo Molnar | 1b427c1 | 2008-07-18 14:01:39 +0200 | [diff] [blame] | 1070 | #else /* CONFIG_SMP */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1071 | |
Ingo Molnar | 1b427c1 | 2008-07-18 14:01:39 +0200 | [diff] [blame] | 1072 | struct sched_domain_attr; |
| 1073 | |
| 1074 | static inline void |
Rusty Russell | acc3f5d | 2009-11-03 14:53:40 +1030 | [diff] [blame] | 1075 | partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], |
Ingo Molnar | 1b427c1 | 2008-07-18 14:01:39 +0200 | [diff] [blame] | 1076 | struct sched_domain_attr *dattr_new) |
Con Kolivas | d02c7a8 | 2007-07-26 13:40:43 +0200 | [diff] [blame] | 1077 | { |
Con Kolivas | d02c7a8 | 2007-07-26 13:40:43 +0200 | [diff] [blame] | 1078 | } |
Peter Zijlstra | 39be350 | 2012-01-26 12:44:34 +0100 | [diff] [blame] | 1079 | |
| 1080 | static inline bool cpus_share_cache(int this_cpu, int that_cpu) |
| 1081 | { |
| 1082 | return true; |
| 1083 | } |
| 1084 | |
Ingo Molnar | 1b427c1 | 2008-07-18 14:01:39 +0200 | [diff] [blame] | 1085 | #endif /* !CONFIG_SMP */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1086 | |
Peter Zijlstra | 47fe38f | 2009-09-02 13:49:18 +0200 | [diff] [blame] | 1087 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1088 | struct io_context; /* See blkdev.h */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | |
Chen, Kenneth W | 383f283 | 2005-09-09 13:02:02 -0700 | [diff] [blame] | 1091 | #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 1092 | extern void prefetch_stack(struct task_struct *t); |
Chen, Kenneth W | 383f283 | 2005-09-09 13:02:02 -0700 | [diff] [blame] | 1093 | #else |
| 1094 | static inline void prefetch_stack(struct task_struct *t) { } |
| 1095 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1096 | |
| 1097 | struct audit_context; /* See audit.c */ |
| 1098 | struct mempolicy; |
Jens Axboe | b92ce55 | 2006-04-11 13:52:07 +0200 | [diff] [blame] | 1099 | struct pipe_inode_info; |
Serge E. Hallyn | 4865ecf | 2006-10-02 02:18:14 -0700 | [diff] [blame] | 1100 | struct uts_namespace; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1101 | |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 1102 | struct rq; |
| 1103 | struct sched_domain; |
| 1104 | |
Peter Zijlstra | 7d47872 | 2009-09-14 19:55:44 +0200 | [diff] [blame] | 1105 | /* |
| 1106 | * wake flags |
| 1107 | */ |
| 1108 | #define WF_SYNC 0x01 /* waker goes to sleep after wakup */ |
Peter Zijlstra | a7558e0 | 2009-09-14 20:02:34 +0200 | [diff] [blame] | 1109 | #define WF_FORK 0x02 /* child wakeup after fork */ |
Peter Zijlstra | f339b9d | 2011-05-31 10:49:20 +0200 | [diff] [blame] | 1110 | #define WF_MIGRATED 0x04 /* internal use, task got migrated */ |
Peter Zijlstra | 7d47872 | 2009-09-14 19:55:44 +0200 | [diff] [blame] | 1111 | |
Peter Zijlstra | 371fd7e | 2010-03-24 16:38:48 +0100 | [diff] [blame] | 1112 | #define ENQUEUE_WAKEUP 1 |
Peter Zijlstra | 74f8e4b | 2011-04-05 17:23:47 +0200 | [diff] [blame] | 1113 | #define ENQUEUE_HEAD 2 |
| 1114 | #ifdef CONFIG_SMP |
| 1115 | #define ENQUEUE_WAKING 4 /* sched_class::task_waking was called */ |
| 1116 | #else |
| 1117 | #define ENQUEUE_WAKING 0 |
| 1118 | #endif |
Peter Zijlstra | 371fd7e | 2010-03-24 16:38:48 +0100 | [diff] [blame] | 1119 | |
| 1120 | #define DEQUEUE_SLEEP 1 |
| 1121 | |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 1122 | struct sched_class { |
Ingo Molnar | 5522d5d | 2007-10-15 17:00:12 +0200 | [diff] [blame] | 1123 | const struct sched_class *next; |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 1124 | |
Peter Zijlstra | 371fd7e | 2010-03-24 16:38:48 +0100 | [diff] [blame] | 1125 | void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags); |
| 1126 | void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags); |
Dmitry Adamushko | 4530d7a | 2007-10-15 17:00:08 +0200 | [diff] [blame] | 1127 | void (*yield_task) (struct rq *rq); |
Mike Galbraith | d95f412 | 2011-02-01 09:50:51 -0500 | [diff] [blame] | 1128 | bool (*yield_to_task) (struct rq *rq, struct task_struct *p, bool preempt); |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 1129 | |
Peter Zijlstra | 7d47872 | 2009-09-14 19:55:44 +0200 | [diff] [blame] | 1130 | void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int flags); |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 1131 | |
Ingo Molnar | fb8d472 | 2007-08-09 11:16:48 +0200 | [diff] [blame] | 1132 | struct task_struct * (*pick_next_task) (struct rq *rq); |
Ingo Molnar | 31ee529 | 2007-08-09 11:16:49 +0200 | [diff] [blame] | 1133 | void (*put_prev_task) (struct rq *rq, struct task_struct *p); |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 1134 | |
Peter Williams | 681f3e6 | 2007-10-24 18:23:51 +0200 | [diff] [blame] | 1135 | #ifdef CONFIG_SMP |
Peter Zijlstra | 7608dec | 2011-04-05 17:23:46 +0200 | [diff] [blame] | 1136 | int (*select_task_rq)(struct task_struct *p, int sd_flag, int flags); |
Li Zefan | 4ce72a2 | 2008-10-22 15:25:26 +0800 | [diff] [blame] | 1137 | |
Steven Rostedt | 9a897c5 | 2008-01-25 21:08:22 +0100 | [diff] [blame] | 1138 | void (*pre_schedule) (struct rq *this_rq, struct task_struct *task); |
| 1139 | void (*post_schedule) (struct rq *this_rq); |
Peter Zijlstra | 74f8e4b | 2011-04-05 17:23:47 +0200 | [diff] [blame] | 1140 | void (*task_waking) (struct task_struct *task); |
Peter Zijlstra | efbbd05 | 2009-12-16 18:04:40 +0100 | [diff] [blame] | 1141 | void (*task_woken) (struct rq *this_rq, struct task_struct *task); |
Peter Williams | e1d1484 | 2007-10-24 18:23:51 +0200 | [diff] [blame] | 1142 | |
Mike Travis | cd8ba7c | 2008-03-26 14:23:49 -0700 | [diff] [blame] | 1143 | void (*set_cpus_allowed)(struct task_struct *p, |
Rusty Russell | 96f874e | 2008-11-25 02:35:14 +1030 | [diff] [blame] | 1144 | const struct cpumask *newmask); |
Gregory Haskins | 57d885f | 2008-01-25 21:08:18 +0100 | [diff] [blame] | 1145 | |
Gregory Haskins | 1f11eb6 | 2008-06-04 15:04:05 -0400 | [diff] [blame] | 1146 | void (*rq_online)(struct rq *rq); |
| 1147 | void (*rq_offline)(struct rq *rq); |
Li Zefan | 4ce72a2 | 2008-10-22 15:25:26 +0800 | [diff] [blame] | 1148 | #endif |
| 1149 | |
| 1150 | void (*set_curr_task) (struct rq *rq); |
| 1151 | void (*task_tick) (struct rq *rq, struct task_struct *p, int queued); |
Peter Zijlstra | cd29fe6 | 2009-11-27 17:32:46 +0100 | [diff] [blame] | 1152 | void (*task_fork) (struct task_struct *p); |
Steven Rostedt | cb46984 | 2008-01-25 21:08:22 +0100 | [diff] [blame] | 1153 | |
Peter Zijlstra | da7a735 | 2011-01-17 17:03:27 +0100 | [diff] [blame] | 1154 | void (*switched_from) (struct rq *this_rq, struct task_struct *task); |
| 1155 | void (*switched_to) (struct rq *this_rq, struct task_struct *task); |
Steven Rostedt | cb46984 | 2008-01-25 21:08:22 +0100 | [diff] [blame] | 1156 | void (*prio_changed) (struct rq *this_rq, struct task_struct *task, |
Peter Zijlstra | da7a735 | 2011-01-17 17:03:27 +0100 | [diff] [blame] | 1157 | int oldprio); |
Peter Zijlstra | 810b381 | 2008-02-29 15:21:01 -0500 | [diff] [blame] | 1158 | |
Thomas Gleixner | dba091b | 2009-12-09 09:32:03 +0100 | [diff] [blame] | 1159 | unsigned int (*get_rr_interval) (struct rq *rq, |
| 1160 | struct task_struct *task); |
Peter Williams | 0d721ce | 2009-09-21 01:31:53 +0000 | [diff] [blame] | 1161 | |
Peter Zijlstra | 810b381 | 2008-02-29 15:21:01 -0500 | [diff] [blame] | 1162 | #ifdef CONFIG_FAIR_GROUP_SCHED |
Peter Zijlstra | b2b5ce0 | 2010-10-15 15:24:15 +0200 | [diff] [blame] | 1163 | void (*task_move_group) (struct task_struct *p, int on_rq); |
Peter Zijlstra | 810b381 | 2008-02-29 15:21:01 -0500 | [diff] [blame] | 1164 | #endif |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 1165 | }; |
| 1166 | |
| 1167 | struct load_weight { |
| 1168 | unsigned long weight, inv_weight; |
| 1169 | }; |
| 1170 | |
Ingo Molnar | 94c1822 | 2007-08-02 17:41:40 +0200 | [diff] [blame] | 1171 | #ifdef CONFIG_SCHEDSTATS |
Lucas De Marchi | 41acab8 | 2010-03-10 23:37:45 -0300 | [diff] [blame] | 1172 | struct sched_statistics { |
Ingo Molnar | 94c1822 | 2007-08-02 17:41:40 +0200 | [diff] [blame] | 1173 | u64 wait_start; |
| 1174 | u64 wait_max; |
Arjan van de Ven | 6d08259 | 2008-01-25 21:08:35 +0100 | [diff] [blame] | 1175 | u64 wait_count; |
| 1176 | u64 wait_sum; |
Arjan van de Ven | 8f0dfc3 | 2009-07-20 11:26:58 -0700 | [diff] [blame] | 1177 | u64 iowait_count; |
| 1178 | u64 iowait_sum; |
Ingo Molnar | 94c1822 | 2007-08-02 17:41:40 +0200 | [diff] [blame] | 1179 | |
| 1180 | u64 sleep_start; |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 1181 | u64 sleep_max; |
Ingo Molnar | 94c1822 | 2007-08-02 17:41:40 +0200 | [diff] [blame] | 1182 | s64 sum_sleep_runtime; |
| 1183 | |
| 1184 | u64 block_start; |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 1185 | u64 block_max; |
| 1186 | u64 exec_max; |
Ingo Molnar | eba1ed4 | 2007-10-15 17:00:02 +0200 | [diff] [blame] | 1187 | u64 slice_max; |
Ingo Molnar | cc36773 | 2007-10-15 17:00:18 +0200 | [diff] [blame] | 1188 | |
Ingo Molnar | cc36773 | 2007-10-15 17:00:18 +0200 | [diff] [blame] | 1189 | u64 nr_migrations_cold; |
| 1190 | u64 nr_failed_migrations_affine; |
| 1191 | u64 nr_failed_migrations_running; |
| 1192 | u64 nr_failed_migrations_hot; |
| 1193 | u64 nr_forced_migrations; |
Ingo Molnar | cc36773 | 2007-10-15 17:00:18 +0200 | [diff] [blame] | 1194 | |
| 1195 | u64 nr_wakeups; |
| 1196 | u64 nr_wakeups_sync; |
| 1197 | u64 nr_wakeups_migrate; |
| 1198 | u64 nr_wakeups_local; |
| 1199 | u64 nr_wakeups_remote; |
| 1200 | u64 nr_wakeups_affine; |
| 1201 | u64 nr_wakeups_affine_attempts; |
| 1202 | u64 nr_wakeups_passive; |
| 1203 | u64 nr_wakeups_idle; |
Lucas De Marchi | 41acab8 | 2010-03-10 23:37:45 -0300 | [diff] [blame] | 1204 | }; |
| 1205 | #endif |
| 1206 | |
| 1207 | struct sched_entity { |
| 1208 | struct load_weight load; /* for load-balancing */ |
| 1209 | struct rb_node run_node; |
| 1210 | struct list_head group_node; |
| 1211 | unsigned int on_rq; |
| 1212 | |
| 1213 | u64 exec_start; |
| 1214 | u64 sum_exec_runtime; |
| 1215 | u64 vruntime; |
| 1216 | u64 prev_sum_exec_runtime; |
| 1217 | |
Lucas De Marchi | 41acab8 | 2010-03-10 23:37:45 -0300 | [diff] [blame] | 1218 | u64 nr_migrations; |
| 1219 | |
Lucas De Marchi | 41acab8 | 2010-03-10 23:37:45 -0300 | [diff] [blame] | 1220 | #ifdef CONFIG_SCHEDSTATS |
| 1221 | struct sched_statistics statistics; |
Ingo Molnar | 94c1822 | 2007-08-02 17:41:40 +0200 | [diff] [blame] | 1222 | #endif |
| 1223 | |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 1224 | #ifdef CONFIG_FAIR_GROUP_SCHED |
| 1225 | struct sched_entity *parent; |
| 1226 | /* rq on which this entity is (to be) queued: */ |
| 1227 | struct cfs_rq *cfs_rq; |
| 1228 | /* rq "owned" by this entity/group: */ |
| 1229 | struct cfs_rq *my_q; |
| 1230 | #endif |
| 1231 | }; |
Ingo Molnar | 70b97a7 | 2006-07-03 00:25:42 -0700 | [diff] [blame] | 1232 | |
Peter Zijlstra | fa71706 | 2008-01-25 21:08:27 +0100 | [diff] [blame] | 1233 | struct sched_rt_entity { |
| 1234 | struct list_head run_list; |
Peter Zijlstra | 78f2c7d | 2008-01-25 21:08:27 +0100 | [diff] [blame] | 1235 | unsigned long timeout; |
Richard Kennedy | bee367e | 2008-08-01 13:24:08 +0100 | [diff] [blame] | 1236 | unsigned int time_slice; |
Peter Zijlstra | 6f505b1 | 2008-01-25 21:08:30 +0100 | [diff] [blame] | 1237 | int nr_cpus_allowed; |
| 1238 | |
Peter Zijlstra | 58d6c2d | 2008-04-19 19:45:00 +0200 | [diff] [blame] | 1239 | struct sched_rt_entity *back; |
Peter Zijlstra | 052f1dc | 2008-02-13 15:45:40 +0100 | [diff] [blame] | 1240 | #ifdef CONFIG_RT_GROUP_SCHED |
Peter Zijlstra | 6f505b1 | 2008-01-25 21:08:30 +0100 | [diff] [blame] | 1241 | struct sched_rt_entity *parent; |
| 1242 | /* rq on which this entity is (to be) queued: */ |
| 1243 | struct rt_rq *rt_rq; |
| 1244 | /* rq "owned" by this entity/group: */ |
| 1245 | struct rt_rq *my_q; |
| 1246 | #endif |
Peter Zijlstra | fa71706 | 2008-01-25 21:08:27 +0100 | [diff] [blame] | 1247 | }; |
| 1248 | |
Hiroshi Shimamoto | de5bdff | 2012-02-16 14:52:21 +0900 | [diff] [blame] | 1249 | /* |
| 1250 | * default timeslice is 100 msecs (used only for SCHED_RR tasks). |
| 1251 | * Timeslices get refilled after they expire. |
| 1252 | */ |
| 1253 | #define RR_TIMESLICE (100 * HZ / 1000) |
| 1254 | |
Paul E. McKenney | 8684896 | 2009-08-27 15:00:12 -0700 | [diff] [blame] | 1255 | struct rcu_node; |
| 1256 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 1257 | enum perf_event_task_context { |
| 1258 | perf_invalid_context = -1, |
| 1259 | perf_hw_context = 0, |
Peter Zijlstra | 89a1e18 | 2010-09-07 17:34:50 +0200 | [diff] [blame] | 1260 | perf_sw_context, |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 1261 | perf_nr_task_contexts, |
| 1262 | }; |
| 1263 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1264 | struct task_struct { |
| 1265 | volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ |
Roman Zippel | f7e4217 | 2007-05-09 02:35:17 -0700 | [diff] [blame] | 1266 | void *stack; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1267 | atomic_t usage; |
William Cohen | 97dc32c | 2007-05-08 00:23:41 -0700 | [diff] [blame] | 1268 | unsigned int flags; /* per process flags, defined below */ |
| 1269 | unsigned int ptrace; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1270 | |
Peter Williams | 2dd73a4 | 2006-06-27 02:54:34 -0700 | [diff] [blame] | 1271 | #ifdef CONFIG_SMP |
Peter Zijlstra | fa14ff4 | 2011-09-12 13:06:17 +0200 | [diff] [blame] | 1272 | struct llist_node wake_entry; |
Peter Zijlstra | 3ca7a44 | 2011-04-05 17:23:40 +0200 | [diff] [blame] | 1273 | int on_cpu; |
Nick Piggin | 4866cde | 2005-06-25 14:57:23 -0700 | [diff] [blame] | 1274 | #endif |
Peter Zijlstra | fd2f441 | 2011-04-05 17:23:44 +0200 | [diff] [blame] | 1275 | int on_rq; |
Ingo Molnar | 50e645a | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 1276 | |
Ingo Molnar | b29739f | 2006-06-27 02:54:51 -0700 | [diff] [blame] | 1277 | int prio, static_prio, normal_prio; |
Richard Kennedy | c7aceab | 2008-05-15 12:09:15 +0100 | [diff] [blame] | 1278 | unsigned int rt_priority; |
Ingo Molnar | 5522d5d | 2007-10-15 17:00:12 +0200 | [diff] [blame] | 1279 | const struct sched_class *sched_class; |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 1280 | struct sched_entity se; |
Peter Zijlstra | fa71706 | 2008-01-25 21:08:27 +0100 | [diff] [blame] | 1281 | struct sched_rt_entity rt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1282 | |
Avi Kivity | e107be3 | 2007-07-26 13:40:43 +0200 | [diff] [blame] | 1283 | #ifdef CONFIG_PREEMPT_NOTIFIERS |
| 1284 | /* list of struct preempt_notifier: */ |
| 1285 | struct hlist_head preempt_notifiers; |
| 1286 | #endif |
| 1287 | |
Alexey Dobriyan | 18796aa | 2007-10-16 23:30:26 -0700 | [diff] [blame] | 1288 | /* |
| 1289 | * fpu_counter contains the number of consecutive context switches |
| 1290 | * that the FPU is used. If this is over a threshold, the lazy fpu |
| 1291 | * saving becomes unlazy to save the trap. This is an unsigned char |
| 1292 | * so that after 256 times the counter wraps and the behavior turns |
| 1293 | * lazy again; this to deal with bursty apps that only use FPU for |
| 1294 | * a short time |
| 1295 | */ |
| 1296 | unsigned char fpu_counter; |
Alexey Dobriyan | 6c5c934 | 2006-09-29 01:59:40 -0700 | [diff] [blame] | 1297 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
Jens Axboe | 2056a78 | 2006-03-23 20:00:26 +0100 | [diff] [blame] | 1298 | unsigned int btrace_seq; |
Alexey Dobriyan | 6c5c934 | 2006-09-29 01:59:40 -0700 | [diff] [blame] | 1299 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1300 | |
William Cohen | 97dc32c | 2007-05-08 00:23:41 -0700 | [diff] [blame] | 1301 | unsigned int policy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1302 | cpumask_t cpus_allowed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1303 | |
Paul E. McKenney | a57eb94 | 2010-06-29 16:49:16 -0700 | [diff] [blame] | 1304 | #ifdef CONFIG_PREEMPT_RCU |
Paul E. McKenney | e260be6 | 2008-01-25 21:08:24 +0100 | [diff] [blame] | 1305 | int rcu_read_lock_nesting; |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 1306 | char rcu_read_unlock_special; |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 1307 | struct list_head rcu_node_entry; |
Paul E. McKenney | a57eb94 | 2010-06-29 16:49:16 -0700 | [diff] [blame] | 1308 | #endif /* #ifdef CONFIG_PREEMPT_RCU */ |
| 1309 | #ifdef CONFIG_TREE_PREEMPT_RCU |
| 1310 | struct rcu_node *rcu_blocked_node; |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 1311 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ |
Paul E. McKenney | 24278d1 | 2010-09-27 17:25:23 -0700 | [diff] [blame] | 1312 | #ifdef CONFIG_RCU_BOOST |
| 1313 | struct rt_mutex *rcu_boost_mutex; |
| 1314 | #endif /* #ifdef CONFIG_RCU_BOOST */ |
Paul E. McKenney | e260be6 | 2008-01-25 21:08:24 +0100 | [diff] [blame] | 1315 | |
Chandra Seetharaman | 52f17b6 | 2006-07-14 00:24:38 -0700 | [diff] [blame] | 1316 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1317 | struct sched_info sched_info; |
| 1318 | #endif |
| 1319 | |
| 1320 | struct list_head tasks; |
Dario Faggioli | 806c09a | 2010-11-30 19:51:33 +0100 | [diff] [blame] | 1321 | #ifdef CONFIG_SMP |
Gregory Haskins | 917b627 | 2008-12-29 09:39:53 -0500 | [diff] [blame] | 1322 | struct plist_node pushable_tasks; |
Dario Faggioli | 806c09a | 2010-11-30 19:51:33 +0100 | [diff] [blame] | 1323 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1324 | |
| 1325 | struct mm_struct *mm, *active_mm; |
Jiri Kosina | 4471a67 | 2011-04-14 15:22:09 -0700 | [diff] [blame] | 1326 | #ifdef CONFIG_COMPAT_BRK |
| 1327 | unsigned brk_randomized:1; |
| 1328 | #endif |
KAMEZAWA Hiroyuki | 34e5523 | 2010-03-05 13:41:40 -0800 | [diff] [blame] | 1329 | #if defined(SPLIT_RSS_COUNTING) |
| 1330 | struct task_rss_stat rss_stat; |
| 1331 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1332 | /* task state */ |
William Cohen | 97dc32c | 2007-05-08 00:23:41 -0700 | [diff] [blame] | 1333 | int exit_state; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1334 | int exit_code, exit_signal; |
| 1335 | int pdeath_signal; /* The signal sent when the parent dies */ |
Tejun Heo | a8f072c | 2011-06-02 11:13:59 +0200 | [diff] [blame] | 1336 | unsigned int jobctl; /* JOBCTL_*, siglock protected */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1337 | /* ??? */ |
William Cohen | 97dc32c | 2007-05-08 00:23:41 -0700 | [diff] [blame] | 1338 | unsigned int personality; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1339 | unsigned did_exec:1; |
Kentaro Takeda | f9ce1f1 | 2009-02-05 17:18:11 +0900 | [diff] [blame] | 1340 | unsigned in_execve:1; /* Tell the LSMs that the process is doing an |
| 1341 | * execve */ |
Arjan van de Ven | 8f0dfc3 | 2009-07-20 11:26:58 -0700 | [diff] [blame] | 1342 | unsigned in_iowait:1; |
| 1343 | |
Lennart Poettering | ca94c44 | 2009-06-15 17:17:47 +0200 | [diff] [blame] | 1344 | |
| 1345 | /* Revert to default priority/policy when forking */ |
| 1346 | unsigned sched_reset_on_fork:1; |
Peter Zijlstra | a8e4f2e | 2011-04-05 17:23:49 +0200 | [diff] [blame] | 1347 | unsigned sched_contributes_to_load:1; |
Lennart Poettering | ca94c44 | 2009-06-15 17:17:47 +0200 | [diff] [blame] | 1348 | |
Alexander Gordeev | 4bcdf1d | 2012-03-09 14:59:26 +0100 | [diff] [blame] | 1349 | #ifdef CONFIG_GENERIC_HARDIRQS |
| 1350 | /* IRQ handler threads */ |
| 1351 | unsigned irq_thread:1; |
| 1352 | #endif |
| 1353 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1354 | pid_t pid; |
| 1355 | pid_t tgid; |
Arjan van de Ven | 0a42540 | 2006-09-26 10:52:38 +0200 | [diff] [blame] | 1356 | |
Hiroshi Shimamoto | 1314562 | 2009-08-18 15:06:02 +0900 | [diff] [blame] | 1357 | #ifdef CONFIG_CC_STACKPROTECTOR |
Arjan van de Ven | 0a42540 | 2006-09-26 10:52:38 +0200 | [diff] [blame] | 1358 | /* Canary value for the -fstack-protector gcc feature */ |
| 1359 | unsigned long stack_canary; |
Hiroshi Shimamoto | 1314562 | 2009-08-18 15:06:02 +0900 | [diff] [blame] | 1360 | #endif |
Ingo Molnar | e003208 | 2008-02-14 08:48:23 +0100 | [diff] [blame] | 1361 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1362 | /* |
| 1363 | * pointers to (original) parent process, youngest child, younger sibling, |
| 1364 | * older sibling, respectively. (p->father can be replaced with |
Roland McGrath | f470021 | 2008-03-24 18:36:23 -0700 | [diff] [blame] | 1365 | * p->real_parent->pid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | */ |
Kees Cook | abd63bc | 2011-12-14 14:39:26 -0800 | [diff] [blame] | 1367 | struct task_struct __rcu *real_parent; /* real parent process */ |
| 1368 | struct task_struct __rcu *parent; /* recipient of SIGCHLD, wait4() reports */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1369 | /* |
Roland McGrath | f470021 | 2008-03-24 18:36:23 -0700 | [diff] [blame] | 1370 | * children/sibling forms the list of my natural children |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1371 | */ |
| 1372 | struct list_head children; /* list of my children */ |
| 1373 | struct list_head sibling; /* linkage in my parent's children list */ |
| 1374 | struct task_struct *group_leader; /* threadgroup leader */ |
| 1375 | |
Roland McGrath | f470021 | 2008-03-24 18:36:23 -0700 | [diff] [blame] | 1376 | /* |
| 1377 | * ptraced is the list of tasks this task is using ptrace on. |
| 1378 | * This includes both natural children and PTRACE_ATTACH targets. |
| 1379 | * p->ptrace_entry is p's link on the p->parent->ptraced list. |
| 1380 | */ |
| 1381 | struct list_head ptraced; |
| 1382 | struct list_head ptrace_entry; |
| 1383 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1384 | /* PID/PID hash table linkage. */ |
Eric W. Biederman | 92476d7 | 2006-03-31 02:31:42 -0800 | [diff] [blame] | 1385 | struct pid_link pids[PIDTYPE_MAX]; |
Oleg Nesterov | 47e6532 | 2006-03-28 16:11:25 -0800 | [diff] [blame] | 1386 | struct list_head thread_group; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1387 | |
| 1388 | struct completion *vfork_done; /* for vfork() */ |
| 1389 | int __user *set_child_tid; /* CLONE_CHILD_SETTID */ |
| 1390 | int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ |
| 1391 | |
Michael Neuling | c66f08b | 2007-10-18 03:06:34 -0700 | [diff] [blame] | 1392 | cputime_t utime, stime, utimescaled, stimescaled; |
Laurent Vivier | 9ac5231 | 2007-10-15 17:00:19 +0200 | [diff] [blame] | 1393 | cputime_t gtime; |
Hidetoshi Seto | d99ca3b | 2009-12-02 17:26:47 +0900 | [diff] [blame] | 1394 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING |
Balbir Singh | 9301899 | 2007-10-30 00:26:32 +0100 | [diff] [blame] | 1395 | cputime_t prev_utime, prev_stime; |
Hidetoshi Seto | d99ca3b | 2009-12-02 17:26:47 +0900 | [diff] [blame] | 1396 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1397 | unsigned long nvcsw, nivcsw; /* context switch counts */ |
Tomas Janousek | 924b42d | 2007-07-15 23:39:42 -0700 | [diff] [blame] | 1398 | struct timespec start_time; /* monotonic time */ |
| 1399 | struct timespec real_start_time; /* boot based time */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1400 | /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ |
| 1401 | unsigned long min_flt, maj_flt; |
| 1402 | |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 1403 | struct task_cputime cputime_expires; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1404 | struct list_head cpu_timers[3]; |
| 1405 | |
| 1406 | /* process credentials */ |
Arnd Bergmann | 1b0ba1c | 2010-02-24 19:45:09 +0100 | [diff] [blame] | 1407 | const struct cred __rcu *real_cred; /* objective and real subjective task |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 1408 | * credentials (COW) */ |
Arnd Bergmann | 1b0ba1c | 2010-02-24 19:45:09 +0100 | [diff] [blame] | 1409 | const struct cred __rcu *cred; /* effective (overridable) subjective task |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 1410 | * credentials (COW) */ |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 1411 | struct cred *replacement_session_keyring; /* for KEYCTL_SESSION_TO_PARENT */ |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1412 | |
Paolo 'Blaisorblade' Giarrusso | 3677209 | 2005-05-05 16:16:12 -0700 | [diff] [blame] | 1413 | char comm[TASK_COMM_LEN]; /* executable name excluding path |
| 1414 | - access with [gs]et_task_comm (which lock |
| 1415 | it with task_lock()) |
Linus Torvalds | 221af7f | 2010-01-28 22:14:42 -0800 | [diff] [blame] | 1416 | - initialized normally by setup_new_exec */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1417 | /* file system info */ |
| 1418 | int link_count, total_link_count; |
Alexey Dobriyan | 3d5b6fc | 2006-09-29 01:59:40 -0700 | [diff] [blame] | 1419 | #ifdef CONFIG_SYSVIPC |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1420 | /* ipc stuff */ |
| 1421 | struct sysv_sem sysvsem; |
Alexey Dobriyan | 3d5b6fc | 2006-09-29 01:59:40 -0700 | [diff] [blame] | 1422 | #endif |
Mandeep Singh Baines | e162b39 | 2009-01-15 11:08:40 -0800 | [diff] [blame] | 1423 | #ifdef CONFIG_DETECT_HUNG_TASK |
Ingo Molnar | 82a1fcb | 2008-01-25 21:08:02 +0100 | [diff] [blame] | 1424 | /* hung task detection */ |
Ingo Molnar | 82a1fcb | 2008-01-25 21:08:02 +0100 | [diff] [blame] | 1425 | unsigned long last_switch_count; |
| 1426 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1427 | /* CPU-specific state of this task */ |
| 1428 | struct thread_struct thread; |
| 1429 | /* filesystem information */ |
| 1430 | struct fs_struct *fs; |
| 1431 | /* open file information */ |
| 1432 | struct files_struct *files; |
Serge E. Hallyn | 1651e14 | 2006-10-02 02:18:08 -0700 | [diff] [blame] | 1433 | /* namespaces */ |
Serge E. Hallyn | ab51601 | 2006-10-02 02:18:06 -0700 | [diff] [blame] | 1434 | struct nsproxy *nsproxy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1435 | /* signal handlers */ |
| 1436 | struct signal_struct *signal; |
| 1437 | struct sighand_struct *sighand; |
| 1438 | |
| 1439 | sigset_t blocked, real_blocked; |
Roland McGrath | f3de272 | 2008-04-30 00:53:09 -0700 | [diff] [blame] | 1440 | sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1441 | struct sigpending pending; |
| 1442 | |
| 1443 | unsigned long sas_ss_sp; |
| 1444 | size_t sas_ss_size; |
| 1445 | int (*notifier)(void *priv); |
| 1446 | void *notifier_data; |
| 1447 | sigset_t *notifier_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1448 | struct audit_context *audit_context; |
Al Viro | bfef93a | 2008-01-10 04:53:18 -0500 | [diff] [blame] | 1449 | #ifdef CONFIG_AUDITSYSCALL |
| 1450 | uid_t loginuid; |
Eric Paris | 4746ec5 | 2008-01-08 10:06:53 -0500 | [diff] [blame] | 1451 | unsigned int sessionid; |
Al Viro | bfef93a | 2008-01-10 04:53:18 -0500 | [diff] [blame] | 1452 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1453 | seccomp_t seccomp; |
| 1454 | |
| 1455 | /* Thread group tracking */ |
| 1456 | u32 parent_exec_id; |
| 1457 | u32 self_exec_id; |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 1458 | /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, |
| 1459 | * mempolicy */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1460 | spinlock_t alloc_lock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1461 | |
Ingo Molnar | b29739f | 2006-06-27 02:54:51 -0700 | [diff] [blame] | 1462 | /* Protection of the PI data structures: */ |
Thomas Gleixner | 1d61548 | 2009-11-17 14:54:03 +0100 | [diff] [blame] | 1463 | raw_spinlock_t pi_lock; |
Ingo Molnar | b29739f | 2006-06-27 02:54:51 -0700 | [diff] [blame] | 1464 | |
Ingo Molnar | 23f78d4a | 2006-06-27 02:54:53 -0700 | [diff] [blame] | 1465 | #ifdef CONFIG_RT_MUTEXES |
| 1466 | /* PI waiters blocked on a rt_mutex held by this task */ |
| 1467 | struct plist_head pi_waiters; |
| 1468 | /* Deadlock detection and priority inheritance handling */ |
| 1469 | struct rt_mutex_waiter *pi_blocked_on; |
Ingo Molnar | 23f78d4a | 2006-06-27 02:54:53 -0700 | [diff] [blame] | 1470 | #endif |
| 1471 | |
Ingo Molnar | 408894e | 2006-01-09 15:59:20 -0800 | [diff] [blame] | 1472 | #ifdef CONFIG_DEBUG_MUTEXES |
| 1473 | /* mutex deadlock detection */ |
| 1474 | struct mutex_waiter *blocked_on; |
| 1475 | #endif |
Ingo Molnar | de30a2b | 2006-07-03 00:24:42 -0700 | [diff] [blame] | 1476 | #ifdef CONFIG_TRACE_IRQFLAGS |
| 1477 | unsigned int irq_events; |
Ingo Molnar | de30a2b | 2006-07-03 00:24:42 -0700 | [diff] [blame] | 1478 | unsigned long hardirq_enable_ip; |
Ingo Molnar | de30a2b | 2006-07-03 00:24:42 -0700 | [diff] [blame] | 1479 | unsigned long hardirq_disable_ip; |
Hiroshi Shimamoto | fa1452e | 2009-11-30 14:59:44 +0900 | [diff] [blame] | 1480 | unsigned int hardirq_enable_event; |
Ingo Molnar | de30a2b | 2006-07-03 00:24:42 -0700 | [diff] [blame] | 1481 | unsigned int hardirq_disable_event; |
Hiroshi Shimamoto | fa1452e | 2009-11-30 14:59:44 +0900 | [diff] [blame] | 1482 | int hardirqs_enabled; |
Ingo Molnar | de30a2b | 2006-07-03 00:24:42 -0700 | [diff] [blame] | 1483 | int hardirq_context; |
Hiroshi Shimamoto | fa1452e | 2009-11-30 14:59:44 +0900 | [diff] [blame] | 1484 | unsigned long softirq_disable_ip; |
| 1485 | unsigned long softirq_enable_ip; |
| 1486 | unsigned int softirq_disable_event; |
| 1487 | unsigned int softirq_enable_event; |
| 1488 | int softirqs_enabled; |
Ingo Molnar | de30a2b | 2006-07-03 00:24:42 -0700 | [diff] [blame] | 1489 | int softirq_context; |
| 1490 | #endif |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 1491 | #ifdef CONFIG_LOCKDEP |
Peter Zijlstra | bdb9441 | 2008-02-25 23:02:48 +0100 | [diff] [blame] | 1492 | # define MAX_LOCK_DEPTH 48UL |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 1493 | u64 curr_chain_key; |
| 1494 | int lockdep_depth; |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 1495 | unsigned int lockdep_recursion; |
Richard Kennedy | c7aceab | 2008-05-15 12:09:15 +0100 | [diff] [blame] | 1496 | struct held_lock held_locks[MAX_LOCK_DEPTH]; |
Nick Piggin | cf40bd1 | 2009-01-21 08:12:39 +0100 | [diff] [blame] | 1497 | gfp_t lockdep_reclaim_gfp; |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 1498 | #endif |
Ingo Molnar | 408894e | 2006-01-09 15:59:20 -0800 | [diff] [blame] | 1499 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1500 | /* journalling filesystem info */ |
| 1501 | void *journal_info; |
| 1502 | |
Neil Brown | d89d879 | 2007-05-01 09:53:42 +0200 | [diff] [blame] | 1503 | /* stacked block device info */ |
Akinobu Mita | bddd87c | 2010-02-23 08:55:42 +0100 | [diff] [blame] | 1504 | struct bio_list *bio_list; |
Neil Brown | d89d879 | 2007-05-01 09:53:42 +0200 | [diff] [blame] | 1505 | |
Jens Axboe | 73c1010 | 2011-03-08 13:19:51 +0100 | [diff] [blame] | 1506 | #ifdef CONFIG_BLOCK |
| 1507 | /* stack plugging */ |
| 1508 | struct blk_plug *plug; |
| 1509 | #endif |
| 1510 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1511 | /* VM state */ |
| 1512 | struct reclaim_state *reclaim_state; |
| 1513 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1514 | struct backing_dev_info *backing_dev_info; |
| 1515 | |
| 1516 | struct io_context *io_context; |
| 1517 | |
| 1518 | unsigned long ptrace_message; |
| 1519 | siginfo_t *last_siginfo; /* For ptrace use. */ |
Andrew Morton | 7c3ab73 | 2006-12-10 02:19:19 -0800 | [diff] [blame] | 1520 | struct task_io_accounting ioac; |
Jay Lan | 8f0ab51 | 2006-09-30 23:28:59 -0700 | [diff] [blame] | 1521 | #if defined(CONFIG_TASK_XACCT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1522 | u64 acct_rss_mem1; /* accumulated rss usage */ |
| 1523 | u64 acct_vm_mem1; /* accumulated virtual memory usage */ |
Jonathan Lim | 49b5cf3 | 2008-07-25 01:48:40 -0700 | [diff] [blame] | 1524 | cputime_t acct_timexpd; /* stime + utime since last update */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1525 | #endif |
| 1526 | #ifdef CONFIG_CPUSETS |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 1527 | nodemask_t mems_allowed; /* Protected by alloc_lock */ |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 1528 | seqcount_t mems_allowed_seq; /* Seqence no to catch updates */ |
Paul Jackson | 825a46a | 2006-03-24 03:16:03 -0800 | [diff] [blame] | 1529 | int cpuset_mem_spread_rotor; |
Jack Steiner | 6adef3e | 2010-05-26 14:42:49 -0700 | [diff] [blame] | 1530 | int cpuset_slab_spread_rotor; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1531 | #endif |
Paul Menage | ddbcc7e | 2007-10-18 23:39:30 -0700 | [diff] [blame] | 1532 | #ifdef CONFIG_CGROUPS |
Paul Menage | 817929e | 2007-10-18 23:39:36 -0700 | [diff] [blame] | 1533 | /* Control Group info protected by css_set_lock */ |
Arnd Bergmann | 2c392b8 | 2010-02-24 19:41:39 +0100 | [diff] [blame] | 1534 | struct css_set __rcu *cgroups; |
Paul Menage | 817929e | 2007-10-18 23:39:36 -0700 | [diff] [blame] | 1535 | /* cg_list protected by css_set_lock and tsk->alloc_lock */ |
| 1536 | struct list_head cg_list; |
Paul Menage | ddbcc7e | 2007-10-18 23:39:30 -0700 | [diff] [blame] | 1537 | #endif |
Alexey Dobriyan | 42b2dd0 | 2007-10-16 23:27:30 -0700 | [diff] [blame] | 1538 | #ifdef CONFIG_FUTEX |
Ingo Molnar | 0771dfe | 2006-03-27 01:16:22 -0800 | [diff] [blame] | 1539 | struct robust_list_head __user *robust_list; |
Ingo Molnar | 34f192c | 2006-03-27 01:16:24 -0800 | [diff] [blame] | 1540 | #ifdef CONFIG_COMPAT |
| 1541 | struct compat_robust_list_head __user *compat_robust_list; |
| 1542 | #endif |
Ingo Molnar | c87e283 | 2006-06-27 02:54:58 -0700 | [diff] [blame] | 1543 | struct list_head pi_state_list; |
| 1544 | struct futex_pi_state *pi_state_cache; |
Alexey Dobriyan | 42b2dd0 | 2007-10-16 23:27:30 -0700 | [diff] [blame] | 1545 | #endif |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1546 | #ifdef CONFIG_PERF_EVENTS |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 1547 | struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts]; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1548 | struct mutex perf_event_mutex; |
| 1549 | struct list_head perf_event_list; |
Paul Mackerras | a63eaf3 | 2009-05-22 14:17:31 +1000 | [diff] [blame] | 1550 | #endif |
Richard Kennedy | c7aceab | 2008-05-15 12:09:15 +0100 | [diff] [blame] | 1551 | #ifdef CONFIG_NUMA |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 1552 | struct mempolicy *mempolicy; /* Protected by alloc_lock */ |
Richard Kennedy | c7aceab | 2008-05-15 12:09:15 +0100 | [diff] [blame] | 1553 | short il_next; |
Eric Dumazet | 207205a | 2011-03-22 16:30:44 -0700 | [diff] [blame] | 1554 | short pref_node_fork; |
Richard Kennedy | c7aceab | 2008-05-15 12:09:15 +0100 | [diff] [blame] | 1555 | #endif |
Ingo Molnar | e56d090 | 2006-01-08 01:01:37 -0800 | [diff] [blame] | 1556 | struct rcu_head rcu; |
Jens Axboe | b92ce55 | 2006-04-11 13:52:07 +0200 | [diff] [blame] | 1557 | |
| 1558 | /* |
| 1559 | * cache last used pipe for splice |
| 1560 | */ |
| 1561 | struct pipe_inode_info *splice_pipe; |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 1562 | #ifdef CONFIG_TASK_DELAY_ACCT |
| 1563 | struct task_delay_info *delays; |
| 1564 | #endif |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1565 | #ifdef CONFIG_FAULT_INJECTION |
| 1566 | int make_it_fail; |
| 1567 | #endif |
Wu Fengguang | 9d823e8 | 2011-06-11 18:10:12 -0600 | [diff] [blame] | 1568 | /* |
| 1569 | * when (nr_dirtied >= nr_dirtied_pause), it's time to call |
| 1570 | * balance_dirty_pages() for some dirty throttling pause |
| 1571 | */ |
| 1572 | int nr_dirtied; |
| 1573 | int nr_dirtied_pause; |
Wu Fengguang | 8371235 | 2011-06-11 19:25:42 -0600 | [diff] [blame] | 1574 | unsigned long dirty_paused_when; /* start of a write-and-pause period */ |
Wu Fengguang | 9d823e8 | 2011-06-11 18:10:12 -0600 | [diff] [blame] | 1575 | |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 1576 | #ifdef CONFIG_LATENCYTOP |
| 1577 | int latency_record_count; |
| 1578 | struct latency_record latency_record[LT_SAVECOUNT]; |
| 1579 | #endif |
Arjan van de Ven | 6976675 | 2008-09-01 15:52:40 -0700 | [diff] [blame] | 1580 | /* |
| 1581 | * time slack values; these are used to round up poll() and |
| 1582 | * select() etc timeout values. These are in nanoseconds. |
| 1583 | */ |
| 1584 | unsigned long timer_slack_ns; |
| 1585 | unsigned long default_timer_slack_ns; |
David Miller | f8d570a | 2008-11-06 00:37:40 -0800 | [diff] [blame] | 1586 | |
| 1587 | struct list_head *scm_work_list; |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 1588 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
Daniel Mack | 3ad2f3f | 2010-02-03 08:01:28 +0800 | [diff] [blame] | 1589 | /* Index of current stored address in ret_stack */ |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 1590 | int curr_ret_stack; |
| 1591 | /* Stack of return addresses for return function tracing */ |
| 1592 | struct ftrace_ret_stack *ret_stack; |
Steven Rostedt | 8aef2d2 | 2009-03-24 01:10:15 -0400 | [diff] [blame] | 1593 | /* time stamp for last schedule */ |
| 1594 | unsigned long long ftrace_timestamp; |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 1595 | /* |
| 1596 | * Number of functions that haven't been traced |
| 1597 | * because of depth overrun. |
| 1598 | */ |
| 1599 | atomic_t trace_overrun; |
Frederic Weisbecker | 380c4b1 | 2008-12-06 03:43:41 +0100 | [diff] [blame] | 1600 | /* Pause for the tracing */ |
| 1601 | atomic_t tracing_graph_pause; |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 1602 | #endif |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 1603 | #ifdef CONFIG_TRACING |
| 1604 | /* state flags for use by tracers */ |
| 1605 | unsigned long trace; |
Steven Rostedt | b1cff0a | 2011-05-25 14:27:43 -0400 | [diff] [blame] | 1606 | /* bitmask and counter of trace recursion */ |
Steven Rostedt | 261842b | 2009-04-16 21:41:52 -0400 | [diff] [blame] | 1607 | unsigned long trace_recursion; |
| 1608 | #endif /* CONFIG_TRACING */ |
KAMEZAWA Hiroyuki | 569b846 | 2009-12-15 16:47:03 -0800 | [diff] [blame] | 1609 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR /* memcg uses this to do batch job */ |
| 1610 | struct memcg_batch_info { |
| 1611 | int do_batch; /* incremented when batch uncharge started */ |
| 1612 | struct mem_cgroup *memcg; /* target memcg of uncharge */ |
Johannes Weiner | 7ffd4ca | 2011-03-23 16:42:35 -0700 | [diff] [blame] | 1613 | unsigned long nr_pages; /* uncharged usage */ |
| 1614 | unsigned long memsw_nr_pages; /* uncharged mem+swap usage */ |
KAMEZAWA Hiroyuki | 569b846 | 2009-12-15 16:47:03 -0800 | [diff] [blame] | 1615 | } memcg_batch; |
| 1616 | #endif |
Frederic Weisbecker | bf26c01 | 2011-04-07 16:53:20 +0200 | [diff] [blame] | 1617 | #ifdef CONFIG_HAVE_HW_BREAKPOINT |
| 1618 | atomic_t ptrace_bp_refcnt; |
| 1619 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1620 | }; |
| 1621 | |
Rusty Russell | 76e6eee | 2009-03-12 14:35:43 -0600 | [diff] [blame] | 1622 | /* Future-safe accessor for struct task_struct's cpus_allowed. */ |
Rusty Russell | a463681 | 2009-12-17 11:43:29 -0600 | [diff] [blame] | 1623 | #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed) |
Rusty Russell | 76e6eee | 2009-03-12 14:35:43 -0600 | [diff] [blame] | 1624 | |
Ingo Molnar | e05606d | 2007-07-09 18:51:59 +0200 | [diff] [blame] | 1625 | /* |
| 1626 | * Priority of a process goes from 0..MAX_PRIO-1, valid RT |
| 1627 | * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH |
| 1628 | * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority |
| 1629 | * values are inverted: lower p->prio value means higher priority. |
| 1630 | * |
| 1631 | * The MAX_USER_RT_PRIO value allows the actual maximum |
| 1632 | * RT priority to be separate from the value exported to |
| 1633 | * user-space. This allows kernel threads to set their |
| 1634 | * priority to a value higher than any user task. Note: |
| 1635 | * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. |
| 1636 | */ |
| 1637 | |
| 1638 | #define MAX_USER_RT_PRIO 100 |
| 1639 | #define MAX_RT_PRIO MAX_USER_RT_PRIO |
| 1640 | |
| 1641 | #define MAX_PRIO (MAX_RT_PRIO + 40) |
| 1642 | #define DEFAULT_PRIO (MAX_RT_PRIO + 20) |
| 1643 | |
| 1644 | static inline int rt_prio(int prio) |
| 1645 | { |
| 1646 | if (unlikely(prio < MAX_RT_PRIO)) |
| 1647 | return 1; |
| 1648 | return 0; |
| 1649 | } |
| 1650 | |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 1651 | static inline int rt_task(struct task_struct *p) |
Ingo Molnar | e05606d | 2007-07-09 18:51:59 +0200 | [diff] [blame] | 1652 | { |
| 1653 | return rt_prio(p->prio); |
| 1654 | } |
| 1655 | |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 1656 | static inline struct pid *task_pid(struct task_struct *task) |
Eric W. Biederman | 22c935f | 2006-10-02 02:17:09 -0700 | [diff] [blame] | 1657 | { |
| 1658 | return task->pids[PIDTYPE_PID].pid; |
| 1659 | } |
| 1660 | |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 1661 | static inline struct pid *task_tgid(struct task_struct *task) |
Eric W. Biederman | 22c935f | 2006-10-02 02:17:09 -0700 | [diff] [blame] | 1662 | { |
| 1663 | return task->group_leader->pids[PIDTYPE_PID].pid; |
| 1664 | } |
| 1665 | |
Oleg Nesterov | 6dda81f | 2009-04-02 16:58:35 -0700 | [diff] [blame] | 1666 | /* |
| 1667 | * Without tasklist or rcu lock it is not safe to dereference |
| 1668 | * the result of task_pgrp/task_session even if task == current, |
| 1669 | * we can race with another thread doing sys_setsid/sys_setpgid. |
| 1670 | */ |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 1671 | static inline struct pid *task_pgrp(struct task_struct *task) |
Eric W. Biederman | 22c935f | 2006-10-02 02:17:09 -0700 | [diff] [blame] | 1672 | { |
| 1673 | return task->group_leader->pids[PIDTYPE_PGID].pid; |
| 1674 | } |
| 1675 | |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 1676 | static inline struct pid *task_session(struct task_struct *task) |
Eric W. Biederman | 22c935f | 2006-10-02 02:17:09 -0700 | [diff] [blame] | 1677 | { |
| 1678 | return task->group_leader->pids[PIDTYPE_SID].pid; |
| 1679 | } |
| 1680 | |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1681 | struct pid_namespace; |
| 1682 | |
| 1683 | /* |
| 1684 | * the helpers to get the task's different pids as they are seen |
| 1685 | * from various namespaces |
| 1686 | * |
| 1687 | * task_xid_nr() : global id, i.e. the id seen from the init namespace; |
Eric W. Biederman | 44c4e1b | 2008-02-08 04:19:15 -0800 | [diff] [blame] | 1688 | * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of |
| 1689 | * current. |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1690 | * task_xid_nr_ns() : id seen from the ns specified; |
| 1691 | * |
| 1692 | * set_task_vxid() : assigns a virtual id to a task; |
| 1693 | * |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1694 | * see also pid_nr() etc in include/linux/pid.h |
| 1695 | */ |
Oleg Nesterov | 52ee2df | 2009-04-02 16:58:38 -0700 | [diff] [blame] | 1696 | pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, |
| 1697 | struct pid_namespace *ns); |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1698 | |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 1699 | static inline pid_t task_pid_nr(struct task_struct *tsk) |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1700 | { |
| 1701 | return tsk->pid; |
| 1702 | } |
| 1703 | |
Oleg Nesterov | 52ee2df | 2009-04-02 16:58:38 -0700 | [diff] [blame] | 1704 | static inline pid_t task_pid_nr_ns(struct task_struct *tsk, |
| 1705 | struct pid_namespace *ns) |
| 1706 | { |
| 1707 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns); |
| 1708 | } |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1709 | |
| 1710 | static inline pid_t task_pid_vnr(struct task_struct *tsk) |
| 1711 | { |
Oleg Nesterov | 52ee2df | 2009-04-02 16:58:38 -0700 | [diff] [blame] | 1712 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL); |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1713 | } |
| 1714 | |
| 1715 | |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 1716 | static inline pid_t task_tgid_nr(struct task_struct *tsk) |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1717 | { |
| 1718 | return tsk->tgid; |
| 1719 | } |
| 1720 | |
Pavel Emelyanov | 2f2a3a4 | 2007-10-18 23:40:19 -0700 | [diff] [blame] | 1721 | pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1722 | |
| 1723 | static inline pid_t task_tgid_vnr(struct task_struct *tsk) |
| 1724 | { |
| 1725 | return pid_vnr(task_tgid(tsk)); |
| 1726 | } |
| 1727 | |
| 1728 | |
Oleg Nesterov | 52ee2df | 2009-04-02 16:58:38 -0700 | [diff] [blame] | 1729 | static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, |
| 1730 | struct pid_namespace *ns) |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1731 | { |
Oleg Nesterov | 52ee2df | 2009-04-02 16:58:38 -0700 | [diff] [blame] | 1732 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns); |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1733 | } |
| 1734 | |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1735 | static inline pid_t task_pgrp_vnr(struct task_struct *tsk) |
| 1736 | { |
Oleg Nesterov | 52ee2df | 2009-04-02 16:58:38 -0700 | [diff] [blame] | 1737 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL); |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1738 | } |
| 1739 | |
| 1740 | |
Oleg Nesterov | 52ee2df | 2009-04-02 16:58:38 -0700 | [diff] [blame] | 1741 | static inline pid_t task_session_nr_ns(struct task_struct *tsk, |
| 1742 | struct pid_namespace *ns) |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1743 | { |
Oleg Nesterov | 52ee2df | 2009-04-02 16:58:38 -0700 | [diff] [blame] | 1744 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns); |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1745 | } |
| 1746 | |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1747 | static inline pid_t task_session_vnr(struct task_struct *tsk) |
| 1748 | { |
Oleg Nesterov | 52ee2df | 2009-04-02 16:58:38 -0700 | [diff] [blame] | 1749 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL); |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1750 | } |
| 1751 | |
Oleg Nesterov | 1b0f7ff | 2009-04-02 16:58:39 -0700 | [diff] [blame] | 1752 | /* obsolete, do not use */ |
| 1753 | static inline pid_t task_pgrp_nr(struct task_struct *tsk) |
| 1754 | { |
| 1755 | return task_pgrp_nr_ns(tsk, &init_pid_ns); |
| 1756 | } |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1757 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1758 | /** |
| 1759 | * pid_alive - check that a task structure is not stale |
| 1760 | * @p: Task structure to be checked. |
| 1761 | * |
| 1762 | * Test if a process is not yet dead (at most zombie state) |
| 1763 | * If pid_alive fails, then pointers within the task structure |
| 1764 | * can be stale and must not be dereferenced. |
| 1765 | */ |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 1766 | static inline int pid_alive(struct task_struct *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1767 | { |
Eric W. Biederman | 92476d7 | 2006-03-31 02:31:42 -0800 | [diff] [blame] | 1768 | return p->pids[PIDTYPE_PID].pid != NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1769 | } |
| 1770 | |
Sukadev Bhattiprolu | f400e19 | 2006-09-29 02:00:07 -0700 | [diff] [blame] | 1771 | /** |
Serge E. Hallyn | b460cbc | 2007-10-18 23:39:52 -0700 | [diff] [blame] | 1772 | * is_global_init - check if a task structure is init |
Henne | 3260259 | 2006-10-06 00:44:01 -0700 | [diff] [blame] | 1773 | * @tsk: Task structure to be checked. |
| 1774 | * |
| 1775 | * Check if a task structure is the first user space task the kernel created. |
Sukadev Bhattiprolu | f400e19 | 2006-09-29 02:00:07 -0700 | [diff] [blame] | 1776 | */ |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 1777 | static inline int is_global_init(struct task_struct *tsk) |
Pavel Emelyanov | b461cc0 | 2007-10-18 23:40:09 -0700 | [diff] [blame] | 1778 | { |
| 1779 | return tsk->pid == 1; |
| 1780 | } |
Serge E. Hallyn | b460cbc | 2007-10-18 23:39:52 -0700 | [diff] [blame] | 1781 | |
| 1782 | /* |
| 1783 | * is_container_init: |
| 1784 | * check whether in the task is init in its own pid namespace. |
| 1785 | */ |
Pavel Emelyanov | b461cc0 | 2007-10-18 23:40:09 -0700 | [diff] [blame] | 1786 | extern int is_container_init(struct task_struct *tsk); |
Sukadev Bhattiprolu | f400e19 | 2006-09-29 02:00:07 -0700 | [diff] [blame] | 1787 | |
Cedric Le Goater | 9ec5209 | 2006-10-02 02:19:00 -0700 | [diff] [blame] | 1788 | extern struct pid *cad_pid; |
| 1789 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1790 | extern void free_task(struct task_struct *tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1791 | #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) |
Ingo Molnar | e56d090 | 2006-01-08 01:01:37 -0800 | [diff] [blame] | 1792 | |
Andrew Morton | 158d9eb | 2006-03-31 02:31:34 -0800 | [diff] [blame] | 1793 | extern void __put_task_struct(struct task_struct *t); |
Ingo Molnar | e56d090 | 2006-01-08 01:01:37 -0800 | [diff] [blame] | 1794 | |
| 1795 | static inline void put_task_struct(struct task_struct *t) |
| 1796 | { |
| 1797 | if (atomic_dec_and_test(&t->usage)) |
Eric W. Biederman | 8c7904a | 2006-03-31 02:31:37 -0800 | [diff] [blame] | 1798 | __put_task_struct(t); |
Ingo Molnar | e56d090 | 2006-01-08 01:01:37 -0800 | [diff] [blame] | 1799 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1800 | |
Hidetoshi Seto | d180c5b | 2009-11-26 14:48:30 +0900 | [diff] [blame] | 1801 | extern void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st); |
Hidetoshi Seto | 0cf55e1 | 2009-12-02 17:28:07 +0900 | [diff] [blame] | 1802 | extern void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st); |
Balbir Singh | 4904862 | 2008-09-05 18:12:23 +0200 | [diff] [blame] | 1803 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1804 | /* |
| 1805 | * Per process flags |
| 1806 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1807 | #define PF_EXITING 0x00000004 /* getting shut down */ |
Alexey Kuznetsov | 778e9a9 | 2007-06-08 13:47:00 -0700 | [diff] [blame] | 1808 | #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ |
Laurent Vivier | 94886b8 | 2007-10-15 17:00:19 +0200 | [diff] [blame] | 1809 | #define PF_VCPU 0x00000010 /* I'm a virtual CPU */ |
Tejun Heo | 21aa9af | 2010-06-08 21:40:37 +0200 | [diff] [blame] | 1810 | #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1811 | #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ |
Andi Kleen | 4db96cf | 2009-09-16 11:50:14 +0200 | [diff] [blame] | 1812 | #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1813 | #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ |
| 1814 | #define PF_DUMPCORE 0x00000200 /* dumped core */ |
| 1815 | #define PF_SIGNALED 0x00000400 /* killed by a signal */ |
| 1816 | #define PF_MEMALLOC 0x00000800 /* Allocating memory */ |
Vasiliy Kulikov | 72fa599 | 2011-08-08 19:02:04 +0400 | [diff] [blame] | 1817 | #define PF_NPROC_EXCEEDED 0x00001000 /* set_user noticed that RLIMIT_NPROC was exceeded */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1818 | #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1819 | #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ |
| 1820 | #define PF_FROZEN 0x00010000 /* frozen for system suspend */ |
| 1821 | #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ |
| 1822 | #define PF_KSWAPD 0x00040000 /* I am kswapd */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1823 | #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ |
Oleg Nesterov | 246bb0b | 2008-07-25 01:47:38 -0700 | [diff] [blame] | 1824 | #define PF_KTHREAD 0x00200000 /* I am a kernel thread */ |
Jens Axboe | b31dc66 | 2006-06-13 08:26:10 +0200 | [diff] [blame] | 1825 | #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ |
| 1826 | #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ |
| 1827 | #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */ |
| 1828 | #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */ |
David Rientjes | 9985b0b | 2008-06-05 12:57:11 -0700 | [diff] [blame] | 1829 | #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */ |
Andi Kleen | 4db96cf | 2009-09-16 11:50:14 +0200 | [diff] [blame] | 1830 | #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */ |
Paul Jackson | c61afb1 | 2006-03-24 03:16:08 -0800 | [diff] [blame] | 1831 | #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */ |
Thomas Gleixner | 61a8712 | 2006-06-27 02:54:56 -0700 | [diff] [blame] | 1832 | #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ |
Tejun Heo | 58a69cb | 2011-02-16 09:25:31 +0100 | [diff] [blame] | 1833 | #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1834 | |
| 1835 | /* |
| 1836 | * Only the _current_ task can read/write to tsk->flags, but other |
| 1837 | * tasks can access tsk->flags in readonly mode for example |
| 1838 | * with tsk_used_math (like during threaded core dumping). |
| 1839 | * There is however an exception to this rule during ptrace |
| 1840 | * or during fork: the ptracer task is allowed to write to the |
| 1841 | * child->flags of its traced child (same goes for fork, the parent |
| 1842 | * can write to the child->flags), because we're guaranteed the |
| 1843 | * child is not running and in turn not changing child->flags |
| 1844 | * at the same time the parent does it. |
| 1845 | */ |
| 1846 | #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) |
| 1847 | #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) |
| 1848 | #define clear_used_math() clear_stopped_child_used_math(current) |
| 1849 | #define set_used_math() set_stopped_child_used_math(current) |
| 1850 | #define conditional_stopped_child_used_math(condition, child) \ |
| 1851 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) |
| 1852 | #define conditional_used_math(condition) \ |
| 1853 | conditional_stopped_child_used_math(condition, current) |
| 1854 | #define copy_to_stopped_child_used_math(child) \ |
| 1855 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) |
| 1856 | /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ |
| 1857 | #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) |
| 1858 | #define used_math() tsk_used_math(current) |
| 1859 | |
Tejun Heo | e5c1902 | 2011-03-23 10:37:00 +0100 | [diff] [blame] | 1860 | /* |
Tejun Heo | a8f072c | 2011-06-02 11:13:59 +0200 | [diff] [blame] | 1861 | * task->jobctl flags |
Tejun Heo | e5c1902 | 2011-03-23 10:37:00 +0100 | [diff] [blame] | 1862 | */ |
Tejun Heo | a8f072c | 2011-06-02 11:13:59 +0200 | [diff] [blame] | 1863 | #define JOBCTL_STOP_SIGMASK 0xffff /* signr of the last group stop */ |
Tejun Heo | e5c1902 | 2011-03-23 10:37:00 +0100 | [diff] [blame] | 1864 | |
Tejun Heo | a8f072c | 2011-06-02 11:13:59 +0200 | [diff] [blame] | 1865 | #define JOBCTL_STOP_DEQUEUED_BIT 16 /* stop signal dequeued */ |
| 1866 | #define JOBCTL_STOP_PENDING_BIT 17 /* task should stop for group stop */ |
| 1867 | #define JOBCTL_STOP_CONSUME_BIT 18 /* consume group stop count */ |
Tejun Heo | 73ddff2 | 2011-06-14 11:20:14 +0200 | [diff] [blame] | 1868 | #define JOBCTL_TRAP_STOP_BIT 19 /* trap for STOP */ |
Tejun Heo | fb1d910 | 2011-06-14 11:20:17 +0200 | [diff] [blame] | 1869 | #define JOBCTL_TRAP_NOTIFY_BIT 20 /* trap for NOTIFY */ |
Tejun Heo | a8f072c | 2011-06-02 11:13:59 +0200 | [diff] [blame] | 1870 | #define JOBCTL_TRAPPING_BIT 21 /* switching to TRACED */ |
Tejun Heo | 544b2c9 | 2011-06-14 11:20:18 +0200 | [diff] [blame] | 1871 | #define JOBCTL_LISTENING_BIT 22 /* ptracer is listening for events */ |
Tejun Heo | a8f072c | 2011-06-02 11:13:59 +0200 | [diff] [blame] | 1872 | |
| 1873 | #define JOBCTL_STOP_DEQUEUED (1 << JOBCTL_STOP_DEQUEUED_BIT) |
| 1874 | #define JOBCTL_STOP_PENDING (1 << JOBCTL_STOP_PENDING_BIT) |
| 1875 | #define JOBCTL_STOP_CONSUME (1 << JOBCTL_STOP_CONSUME_BIT) |
Tejun Heo | 73ddff2 | 2011-06-14 11:20:14 +0200 | [diff] [blame] | 1876 | #define JOBCTL_TRAP_STOP (1 << JOBCTL_TRAP_STOP_BIT) |
Tejun Heo | fb1d910 | 2011-06-14 11:20:17 +0200 | [diff] [blame] | 1877 | #define JOBCTL_TRAP_NOTIFY (1 << JOBCTL_TRAP_NOTIFY_BIT) |
Tejun Heo | a8f072c | 2011-06-02 11:13:59 +0200 | [diff] [blame] | 1878 | #define JOBCTL_TRAPPING (1 << JOBCTL_TRAPPING_BIT) |
Tejun Heo | 544b2c9 | 2011-06-14 11:20:18 +0200 | [diff] [blame] | 1879 | #define JOBCTL_LISTENING (1 << JOBCTL_LISTENING_BIT) |
Tejun Heo | a8f072c | 2011-06-02 11:13:59 +0200 | [diff] [blame] | 1880 | |
Tejun Heo | fb1d910 | 2011-06-14 11:20:17 +0200 | [diff] [blame] | 1881 | #define JOBCTL_TRAP_MASK (JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY) |
Tejun Heo | 73ddff2 | 2011-06-14 11:20:14 +0200 | [diff] [blame] | 1882 | #define JOBCTL_PENDING_MASK (JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK) |
Tejun Heo | 3759a0d | 2011-06-02 11:14:00 +0200 | [diff] [blame] | 1883 | |
Tejun Heo | 7dd3db5 | 2011-06-02 11:14:00 +0200 | [diff] [blame] | 1884 | extern bool task_set_jobctl_pending(struct task_struct *task, |
| 1885 | unsigned int mask); |
Tejun Heo | 73ddff2 | 2011-06-14 11:20:14 +0200 | [diff] [blame] | 1886 | extern void task_clear_jobctl_trapping(struct task_struct *task); |
Tejun Heo | 3759a0d | 2011-06-02 11:14:00 +0200 | [diff] [blame] | 1887 | extern void task_clear_jobctl_pending(struct task_struct *task, |
| 1888 | unsigned int mask); |
Tejun Heo | 39efa3e | 2011-03-23 10:37:00 +0100 | [diff] [blame] | 1889 | |
Paul E. McKenney | a57eb94 | 2010-06-29 16:49:16 -0700 | [diff] [blame] | 1890 | #ifdef CONFIG_PREEMPT_RCU |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 1891 | |
| 1892 | #define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */ |
Paul E. McKenney | 1aa03f1 | 2012-01-11 17:25:17 -0800 | [diff] [blame] | 1893 | #define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */ |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 1894 | |
| 1895 | static inline void rcu_copy_process(struct task_struct *p) |
| 1896 | { |
| 1897 | p->rcu_read_lock_nesting = 0; |
| 1898 | p->rcu_read_unlock_special = 0; |
Paul E. McKenney | a57eb94 | 2010-06-29 16:49:16 -0700 | [diff] [blame] | 1899 | #ifdef CONFIG_TREE_PREEMPT_RCU |
Paul E. McKenney | dd5d19b | 2009-08-27 14:58:16 -0700 | [diff] [blame] | 1900 | p->rcu_blocked_node = NULL; |
Paul E. McKenney | 24278d1 | 2010-09-27 17:25:23 -0700 | [diff] [blame] | 1901 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ |
| 1902 | #ifdef CONFIG_RCU_BOOST |
| 1903 | p->rcu_boost_mutex = NULL; |
| 1904 | #endif /* #ifdef CONFIG_RCU_BOOST */ |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 1905 | INIT_LIST_HEAD(&p->rcu_node_entry); |
| 1906 | } |
| 1907 | |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 1908 | #else |
| 1909 | |
| 1910 | static inline void rcu_copy_process(struct task_struct *p) |
| 1911 | { |
| 1912 | } |
| 1913 | |
| 1914 | #endif |
| 1915 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1916 | #ifdef CONFIG_SMP |
KOSAKI Motohiro | 1e1b6c5 | 2011-05-19 15:08:58 +0900 | [diff] [blame] | 1917 | extern void do_set_cpus_allowed(struct task_struct *p, |
| 1918 | const struct cpumask *new_mask); |
| 1919 | |
Mike Travis | cd8ba7c | 2008-03-26 14:23:49 -0700 | [diff] [blame] | 1920 | extern int set_cpus_allowed_ptr(struct task_struct *p, |
Rusty Russell | 96f874e | 2008-11-25 02:35:14 +1030 | [diff] [blame] | 1921 | const struct cpumask *new_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1922 | #else |
KOSAKI Motohiro | 1e1b6c5 | 2011-05-19 15:08:58 +0900 | [diff] [blame] | 1923 | static inline void do_set_cpus_allowed(struct task_struct *p, |
| 1924 | const struct cpumask *new_mask) |
| 1925 | { |
| 1926 | } |
Mike Travis | cd8ba7c | 2008-03-26 14:23:49 -0700 | [diff] [blame] | 1927 | static inline int set_cpus_allowed_ptr(struct task_struct *p, |
Rusty Russell | 96f874e | 2008-11-25 02:35:14 +1030 | [diff] [blame] | 1928 | const struct cpumask *new_mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1929 | { |
Rusty Russell | 96f874e | 2008-11-25 02:35:14 +1030 | [diff] [blame] | 1930 | if (!cpumask_test_cpu(0, new_mask)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1931 | return -EINVAL; |
| 1932 | return 0; |
| 1933 | } |
| 1934 | #endif |
Rusty Russell | e0ad955 | 2009-09-24 09:34:38 -0600 | [diff] [blame] | 1935 | |
| 1936 | #ifndef CONFIG_CPUMASK_OFFSTACK |
Mike Travis | cd8ba7c | 2008-03-26 14:23:49 -0700 | [diff] [blame] | 1937 | static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) |
| 1938 | { |
| 1939 | return set_cpus_allowed_ptr(p, &new_mask); |
| 1940 | } |
Rusty Russell | e0ad955 | 2009-09-24 09:34:38 -0600 | [diff] [blame] | 1941 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1942 | |
Ingo Molnar | b342501 | 2009-02-26 20:20:29 +0100 | [diff] [blame] | 1943 | /* |
Peter Zijlstra | c676329 | 2010-05-25 10:48:51 +0200 | [diff] [blame] | 1944 | * Do not use outside of architecture code which knows its limitations. |
| 1945 | * |
| 1946 | * sched_clock() has no promise of monotonicity or bounded drift between |
| 1947 | * CPUs, use (which you should not) requires disabling IRQs. |
| 1948 | * |
| 1949 | * Please use one of the three interfaces below. |
Ingo Molnar | b342501 | 2009-02-26 20:20:29 +0100 | [diff] [blame] | 1950 | */ |
Mike Frysinger | 1bbfa6f | 2009-12-09 20:07:03 -0500 | [diff] [blame] | 1951 | extern unsigned long long notrace sched_clock(void); |
Peter Zijlstra | c676329 | 2010-05-25 10:48:51 +0200 | [diff] [blame] | 1952 | /* |
| 1953 | * See the comment in kernel/sched_clock.c |
| 1954 | */ |
| 1955 | extern u64 cpu_clock(int cpu); |
| 1956 | extern u64 local_clock(void); |
| 1957 | extern u64 sched_clock_cpu(int cpu); |
| 1958 | |
Ingo Molnar | e436d80 | 2007-07-19 21:28:35 +0200 | [diff] [blame] | 1959 | |
Peter Zijlstra | c1955a3 | 2008-08-11 08:59:03 +0200 | [diff] [blame] | 1960 | extern void sched_clock_init(void); |
Peter Zijlstra | c1955a3 | 2008-08-11 08:59:03 +0200 | [diff] [blame] | 1961 | |
Peter Zijlstra | 3e51f33 | 2008-05-03 18:29:28 +0200 | [diff] [blame] | 1962 | #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK |
Peter Zijlstra | 3e51f33 | 2008-05-03 18:29:28 +0200 | [diff] [blame] | 1963 | static inline void sched_clock_tick(void) |
| 1964 | { |
| 1965 | } |
| 1966 | |
| 1967 | static inline void sched_clock_idle_sleep_event(void) |
| 1968 | { |
| 1969 | } |
| 1970 | |
| 1971 | static inline void sched_clock_idle_wakeup_event(u64 delta_ns) |
| 1972 | { |
| 1973 | } |
| 1974 | #else |
Peter Zijlstra | c676329 | 2010-05-25 10:48:51 +0200 | [diff] [blame] | 1975 | /* |
| 1976 | * Architectures can set this to 1 if they have specified |
| 1977 | * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig, |
| 1978 | * but then during bootup it turns out that sched_clock() |
| 1979 | * is reliable after all: |
| 1980 | */ |
| 1981 | extern int sched_clock_stable; |
| 1982 | |
Peter Zijlstra | 3e51f33 | 2008-05-03 18:29:28 +0200 | [diff] [blame] | 1983 | extern void sched_clock_tick(void); |
| 1984 | extern void sched_clock_idle_sleep_event(void); |
| 1985 | extern void sched_clock_idle_wakeup_event(u64 delta_ns); |
| 1986 | #endif |
| 1987 | |
Venkatesh Pallipadi | b52bfee | 2010-10-04 17:03:19 -0700 | [diff] [blame] | 1988 | #ifdef CONFIG_IRQ_TIME_ACCOUNTING |
| 1989 | /* |
| 1990 | * An i/f to runtime opt-in for irq time accounting based off of sched_clock. |
| 1991 | * The reason for this explicit opt-in is not to have perf penalty with |
| 1992 | * slow sched_clocks. |
| 1993 | */ |
| 1994 | extern void enable_sched_clock_irqtime(void); |
| 1995 | extern void disable_sched_clock_irqtime(void); |
| 1996 | #else |
| 1997 | static inline void enable_sched_clock_irqtime(void) {} |
| 1998 | static inline void disable_sched_clock_irqtime(void) {} |
| 1999 | #endif |
| 2000 | |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 2001 | extern unsigned long long |
Ingo Molnar | 41b86e9 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 2002 | task_sched_runtime(struct task_struct *task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2003 | |
| 2004 | /* sched_exec is called by processes performing an exec */ |
| 2005 | #ifdef CONFIG_SMP |
| 2006 | extern void sched_exec(void); |
| 2007 | #else |
| 2008 | #define sched_exec() {} |
| 2009 | #endif |
| 2010 | |
Ingo Molnar | 2aa44d0 | 2007-08-23 15:18:02 +0200 | [diff] [blame] | 2011 | extern void sched_clock_idle_sleep_event(void); |
| 2012 | extern void sched_clock_idle_wakeup_event(u64 delta_ns); |
Ingo Molnar | bb29ab2 | 2007-07-09 18:51:59 +0200 | [diff] [blame] | 2013 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2014 | #ifdef CONFIG_HOTPLUG_CPU |
| 2015 | extern void idle_task_exit(void); |
| 2016 | #else |
| 2017 | static inline void idle_task_exit(void) {} |
| 2018 | #endif |
| 2019 | |
Thomas Gleixner | 06d8308 | 2008-03-22 09:20:24 +0100 | [diff] [blame] | 2020 | #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP) |
| 2021 | extern void wake_up_idle_cpu(int cpu); |
| 2022 | #else |
| 2023 | static inline void wake_up_idle_cpu(int cpu) { } |
| 2024 | #endif |
| 2025 | |
Peter Zijlstra | 2180508 | 2007-08-25 18:41:53 +0200 | [diff] [blame] | 2026 | extern unsigned int sysctl_sched_latency; |
Peter Zijlstra | b2be5e9 | 2007-11-09 22:39:37 +0100 | [diff] [blame] | 2027 | extern unsigned int sysctl_sched_min_granularity; |
Ingo Molnar | bf0f6f2 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 2028 | extern unsigned int sysctl_sched_wakeup_granularity; |
Ingo Molnar | bf0f6f2 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 2029 | extern unsigned int sysctl_sched_child_runs_first; |
Christian Ehrhardt | 1983a92 | 2009-11-30 12:16:47 +0100 | [diff] [blame] | 2030 | |
| 2031 | enum sched_tunable_scaling { |
| 2032 | SCHED_TUNABLESCALING_NONE, |
| 2033 | SCHED_TUNABLESCALING_LOG, |
| 2034 | SCHED_TUNABLESCALING_LINEAR, |
| 2035 | SCHED_TUNABLESCALING_END, |
| 2036 | }; |
| 2037 | extern enum sched_tunable_scaling sysctl_sched_tunable_scaling; |
| 2038 | |
Mike Galbraith | 2bba22c | 2009-09-09 15:41:37 +0200 | [diff] [blame] | 2039 | #ifdef CONFIG_SCHED_DEBUG |
Ingo Molnar | da84d96 | 2007-10-15 17:00:18 +0200 | [diff] [blame] | 2040 | extern unsigned int sysctl_sched_migration_cost; |
Peter Zijlstra | b82d9fd | 2007-11-09 22:39:39 +0100 | [diff] [blame] | 2041 | extern unsigned int sysctl_sched_nr_migrate; |
Peter Zijlstra | e9e9250 | 2009-09-01 10:34:37 +0200 | [diff] [blame] | 2042 | extern unsigned int sysctl_sched_time_avg; |
Arun R Bharadwaj | cd1bb94 | 2009-04-16 12:15:34 +0530 | [diff] [blame] | 2043 | extern unsigned int sysctl_timer_migration; |
Paul Turner | a7a4f8a | 2010-11-15 15:47:06 -0800 | [diff] [blame] | 2044 | extern unsigned int sysctl_sched_shares_window; |
Peter Zijlstra | b2be5e9 | 2007-11-09 22:39:37 +0100 | [diff] [blame] | 2045 | |
Christian Ehrhardt | 1983a92 | 2009-11-30 12:16:47 +0100 | [diff] [blame] | 2046 | int sched_proc_update_handler(struct ctl_table *table, int write, |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 2047 | void __user *buffer, size_t *length, |
Peter Zijlstra | b2be5e9 | 2007-11-09 22:39:37 +0100 | [diff] [blame] | 2048 | loff_t *ppos); |
Ingo Molnar | 2bd8e6d | 2007-10-15 17:00:02 +0200 | [diff] [blame] | 2049 | #endif |
Arun R Bharadwaj | eea08f3 | 2009-04-16 12:16:41 +0530 | [diff] [blame] | 2050 | #ifdef CONFIG_SCHED_DEBUG |
| 2051 | static inline unsigned int get_sysctl_timer_migration(void) |
| 2052 | { |
| 2053 | return sysctl_timer_migration; |
| 2054 | } |
| 2055 | #else |
| 2056 | static inline unsigned int get_sysctl_timer_migration(void) |
| 2057 | { |
| 2058 | return 1; |
| 2059 | } |
| 2060 | #endif |
Peter Zijlstra | 9f0c1e5 | 2008-02-13 15:45:39 +0100 | [diff] [blame] | 2061 | extern unsigned int sysctl_sched_rt_period; |
| 2062 | extern int sysctl_sched_rt_runtime; |
Ingo Molnar | 2bd8e6d | 2007-10-15 17:00:02 +0200 | [diff] [blame] | 2063 | |
Peter Zijlstra | d0b27fa | 2008-04-19 19:44:57 +0200 | [diff] [blame] | 2064 | int sched_rt_handler(struct ctl_table *table, int write, |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 2065 | void __user *buffer, size_t *lenp, |
Peter Zijlstra | d0b27fa | 2008-04-19 19:44:57 +0200 | [diff] [blame] | 2066 | loff_t *ppos); |
| 2067 | |
Mike Galbraith | 5091faa | 2010-11-30 14:18:03 +0100 | [diff] [blame] | 2068 | #ifdef CONFIG_SCHED_AUTOGROUP |
| 2069 | extern unsigned int sysctl_sched_autogroup_enabled; |
| 2070 | |
| 2071 | extern void sched_autogroup_create_attach(struct task_struct *p); |
| 2072 | extern void sched_autogroup_detach(struct task_struct *p); |
| 2073 | extern void sched_autogroup_fork(struct signal_struct *sig); |
| 2074 | extern void sched_autogroup_exit(struct signal_struct *sig); |
| 2075 | #ifdef CONFIG_PROC_FS |
| 2076 | extern void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m); |
Hiroshi Shimamoto | 2e5b5b3 | 2012-02-23 17:41:27 +0900 | [diff] [blame] | 2077 | extern int proc_sched_autogroup_set_nice(struct task_struct *p, int nice); |
Mike Galbraith | 5091faa | 2010-11-30 14:18:03 +0100 | [diff] [blame] | 2078 | #endif |
| 2079 | #else |
| 2080 | static inline void sched_autogroup_create_attach(struct task_struct *p) { } |
| 2081 | static inline void sched_autogroup_detach(struct task_struct *p) { } |
| 2082 | static inline void sched_autogroup_fork(struct signal_struct *sig) { } |
| 2083 | static inline void sched_autogroup_exit(struct signal_struct *sig) { } |
| 2084 | #endif |
| 2085 | |
Paul Turner | ec12cb7 | 2011-07-21 09:43:30 -0700 | [diff] [blame] | 2086 | #ifdef CONFIG_CFS_BANDWIDTH |
| 2087 | extern unsigned int sysctl_sched_cfs_bandwidth_slice; |
| 2088 | #endif |
| 2089 | |
Ingo Molnar | b29739f | 2006-06-27 02:54:51 -0700 | [diff] [blame] | 2090 | #ifdef CONFIG_RT_MUTEXES |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 2091 | extern int rt_mutex_getprio(struct task_struct *p); |
| 2092 | extern void rt_mutex_setprio(struct task_struct *p, int prio); |
| 2093 | extern void rt_mutex_adjust_pi(struct task_struct *p); |
Thomas Gleixner | 3c7d518 | 2011-07-17 20:46:52 +0200 | [diff] [blame] | 2094 | static inline bool tsk_is_pi_blocked(struct task_struct *tsk) |
| 2095 | { |
| 2096 | return tsk->pi_blocked_on != NULL; |
| 2097 | } |
Ingo Molnar | b29739f | 2006-06-27 02:54:51 -0700 | [diff] [blame] | 2098 | #else |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 2099 | static inline int rt_mutex_getprio(struct task_struct *p) |
Ingo Molnar | b29739f | 2006-06-27 02:54:51 -0700 | [diff] [blame] | 2100 | { |
| 2101 | return p->normal_prio; |
| 2102 | } |
Thomas Gleixner | 95e02ca | 2006-06-27 02:55:02 -0700 | [diff] [blame] | 2103 | # define rt_mutex_adjust_pi(p) do { } while (0) |
Thomas Gleixner | 3c7d518 | 2011-07-17 20:46:52 +0200 | [diff] [blame] | 2104 | static inline bool tsk_is_pi_blocked(struct task_struct *tsk) |
| 2105 | { |
| 2106 | return false; |
| 2107 | } |
Ingo Molnar | b29739f | 2006-06-27 02:54:51 -0700 | [diff] [blame] | 2108 | #endif |
| 2109 | |
Mike Galbraith | d95f412 | 2011-02-01 09:50:51 -0500 | [diff] [blame] | 2110 | extern bool yield_to(struct task_struct *p, bool preempt); |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 2111 | extern void set_user_nice(struct task_struct *p, long nice); |
| 2112 | extern int task_prio(const struct task_struct *p); |
| 2113 | extern int task_nice(const struct task_struct *p); |
| 2114 | extern int can_nice(const struct task_struct *p, const int nice); |
| 2115 | extern int task_curr(const struct task_struct *p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2116 | extern int idle_cpu(int cpu); |
KOSAKI Motohiro | fe7de49 | 2010-10-20 16:01:12 -0700 | [diff] [blame] | 2117 | extern int sched_setscheduler(struct task_struct *, int, |
| 2118 | const struct sched_param *); |
Rusty Russell | 961ccdd | 2008-06-23 13:55:38 +1000 | [diff] [blame] | 2119 | extern int sched_setscheduler_nocheck(struct task_struct *, int, |
KOSAKI Motohiro | fe7de49 | 2010-10-20 16:01:12 -0700 | [diff] [blame] | 2120 | const struct sched_param *); |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 2121 | extern struct task_struct *idle_task(int cpu); |
Paul E. McKenney | c4f3060 | 2011-11-10 12:41:56 -0800 | [diff] [blame] | 2122 | /** |
| 2123 | * is_idle_task - is the specified task an idle task? |
Randy Dunlap | fa75728 | 2012-01-21 11:03:13 -0800 | [diff] [blame] | 2124 | * @p: the task in question. |
Paul E. McKenney | c4f3060 | 2011-11-10 12:41:56 -0800 | [diff] [blame] | 2125 | */ |
Paul E. McKenney | 7061ca3 | 2011-12-20 08:20:46 -0800 | [diff] [blame] | 2126 | static inline bool is_idle_task(const struct task_struct *p) |
Paul E. McKenney | c4f3060 | 2011-11-10 12:41:56 -0800 | [diff] [blame] | 2127 | { |
| 2128 | return p->pid == 0; |
| 2129 | } |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 2130 | extern struct task_struct *curr_task(int cpu); |
| 2131 | extern void set_curr_task(int cpu, struct task_struct *p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2132 | |
| 2133 | void yield(void); |
| 2134 | |
| 2135 | /* |
| 2136 | * The default (Linux) execution domain. |
| 2137 | */ |
| 2138 | extern struct exec_domain default_exec_domain; |
| 2139 | |
| 2140 | union thread_union { |
| 2141 | struct thread_info thread_info; |
| 2142 | unsigned long stack[THREAD_SIZE/sizeof(long)]; |
| 2143 | }; |
| 2144 | |
| 2145 | #ifndef __HAVE_ARCH_KSTACK_END |
| 2146 | static inline int kstack_end(void *addr) |
| 2147 | { |
| 2148 | /* Reliable end of stack detection: |
| 2149 | * Some APM bios versions misalign the stack |
| 2150 | */ |
| 2151 | return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); |
| 2152 | } |
| 2153 | #endif |
| 2154 | |
| 2155 | extern union thread_union init_thread_union; |
| 2156 | extern struct task_struct init_task; |
| 2157 | |
| 2158 | extern struct mm_struct init_mm; |
| 2159 | |
Pavel Emelyanov | 198fe21 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 2160 | extern struct pid_namespace init_pid_ns; |
| 2161 | |
| 2162 | /* |
| 2163 | * find a task by one of its numerical ids |
| 2164 | * |
Pavel Emelyanov | 198fe21 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 2165 | * find_task_by_pid_ns(): |
| 2166 | * finds a task by its pid in the specified namespace |
Pavel Emelyanov | 228ebcb | 2007-10-18 23:40:16 -0700 | [diff] [blame] | 2167 | * find_task_by_vpid(): |
| 2168 | * finds a task by its virtual pid |
Pavel Emelyanov | 198fe21 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 2169 | * |
Pavel Emelyanov | e49859e | 2008-07-25 01:48:36 -0700 | [diff] [blame] | 2170 | * see also find_vpid() etc in include/linux/pid.h |
Pavel Emelyanov | 198fe21 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 2171 | */ |
| 2172 | |
Pavel Emelyanov | 228ebcb | 2007-10-18 23:40:16 -0700 | [diff] [blame] | 2173 | extern struct task_struct *find_task_by_vpid(pid_t nr); |
| 2174 | extern struct task_struct *find_task_by_pid_ns(pid_t nr, |
| 2175 | struct pid_namespace *ns); |
Pavel Emelyanov | 198fe21 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 2176 | |
Oleg Nesterov | 8520d7c | 2008-02-08 04:19:09 -0800 | [diff] [blame] | 2177 | extern void __set_special_pids(struct pid *pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2178 | |
| 2179 | /* per-UID process charging. */ |
Cedric Le Goater | acce292 | 2007-07-15 23:40:59 -0700 | [diff] [blame] | 2180 | extern struct user_struct * alloc_uid(struct user_namespace *, uid_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2181 | static inline struct user_struct *get_uid(struct user_struct *u) |
| 2182 | { |
| 2183 | atomic_inc(&u->__count); |
| 2184 | return u; |
| 2185 | } |
| 2186 | extern void free_uid(struct user_struct *); |
Pavel Emelyanov | 28f300d | 2007-09-18 22:46:45 -0700 | [diff] [blame] | 2187 | extern void release_uids(struct user_namespace *ns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2188 | |
| 2189 | #include <asm/current.h> |
| 2190 | |
Torben Hohn | f0af911a9 | 2011-01-27 15:59:10 +0100 | [diff] [blame] | 2191 | extern void xtime_update(unsigned long ticks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2192 | |
Harvey Harrison | b3c9752 | 2008-02-13 15:03:15 -0800 | [diff] [blame] | 2193 | extern int wake_up_state(struct task_struct *tsk, unsigned int state); |
| 2194 | extern int wake_up_process(struct task_struct *tsk); |
Samir Bellabes | 3e51e3e | 2011-05-11 18:18:05 +0200 | [diff] [blame] | 2195 | extern void wake_up_new_task(struct task_struct *tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2196 | #ifdef CONFIG_SMP |
| 2197 | extern void kick_process(struct task_struct *tsk); |
| 2198 | #else |
| 2199 | static inline void kick_process(struct task_struct *tsk) { } |
| 2200 | #endif |
Samir Bellabes | 3e51e3e | 2011-05-11 18:18:05 +0200 | [diff] [blame] | 2201 | extern void sched_fork(struct task_struct *p); |
Ingo Molnar | ad46c2c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 2202 | extern void sched_dead(struct task_struct *p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2203 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2204 | extern void proc_caches_init(void); |
| 2205 | extern void flush_signals(struct task_struct *); |
David Howells | 3bcac02 | 2009-04-29 13:45:05 +0100 | [diff] [blame] | 2206 | extern void __flush_signals(struct task_struct *); |
Oleg Nesterov | 10ab825 | 2007-05-09 02:34:37 -0700 | [diff] [blame] | 2207 | extern void ignore_signals(struct task_struct *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2208 | extern void flush_signal_handlers(struct task_struct *, int force_default); |
| 2209 | extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); |
| 2210 | |
| 2211 | static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) |
| 2212 | { |
| 2213 | unsigned long flags; |
| 2214 | int ret; |
| 2215 | |
| 2216 | spin_lock_irqsave(&tsk->sighand->siglock, flags); |
| 2217 | ret = dequeue_signal(tsk, mask, info); |
| 2218 | spin_unlock_irqrestore(&tsk->sighand->siglock, flags); |
| 2219 | |
| 2220 | return ret; |
Oleg Nesterov | 53c8f9f | 2011-06-22 23:08:18 +0200 | [diff] [blame] | 2221 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2222 | |
| 2223 | extern void block_all_signals(int (*notifier)(void *priv), void *priv, |
| 2224 | sigset_t *mask); |
| 2225 | extern void unblock_all_signals(void); |
| 2226 | extern void release_task(struct task_struct * p); |
| 2227 | extern int send_sig_info(int, struct siginfo *, struct task_struct *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2228 | extern int force_sigsegv(int, struct task_struct *); |
| 2229 | extern int force_sig_info(int, struct siginfo *, struct task_struct *); |
Eric W. Biederman | c4b92fc | 2006-10-02 02:17:10 -0700 | [diff] [blame] | 2230 | extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); |
Eric W. Biederman | c4b92fc | 2006-10-02 02:17:10 -0700 | [diff] [blame] | 2231 | extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid); |
Serge Hallyn | d178bc3 | 2011-09-26 10:45:18 -0500 | [diff] [blame] | 2232 | extern int kill_pid_info_as_cred(int, struct siginfo *, struct pid *, |
| 2233 | const struct cred *, u32); |
Eric W. Biederman | c4b92fc | 2006-10-02 02:17:10 -0700 | [diff] [blame] | 2234 | extern int kill_pgrp(struct pid *pid, int sig, int priv); |
| 2235 | extern int kill_pid(struct pid *pid, int sig, int priv); |
Matthew Wilcox | c3de4b3 | 2007-02-09 08:11:47 -0700 | [diff] [blame] | 2236 | extern int kill_proc_info(int, struct siginfo *, pid_t); |
Oleg Nesterov | 8677347 | 2011-06-22 23:09:09 +0200 | [diff] [blame] | 2237 | extern __must_check bool do_notify_parent(struct task_struct *, int); |
Oleg Nesterov | a7f0765 | 2009-09-23 15:56:44 -0700 | [diff] [blame] | 2238 | extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2239 | extern void force_sig(int, struct task_struct *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2240 | extern int send_sig(int, struct task_struct *, int); |
Oleg Nesterov | 09faef1 | 2010-05-26 14:43:11 -0700 | [diff] [blame] | 2241 | extern int zap_other_threads(struct task_struct *p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2242 | extern struct sigqueue *sigqueue_alloc(void); |
| 2243 | extern void sigqueue_free(struct sigqueue *); |
Oleg Nesterov | ac5c215 | 2008-04-30 00:52:57 -0700 | [diff] [blame] | 2244 | extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group); |
Oleg Nesterov | 9ac95f2 | 2006-02-09 22:41:50 +0300 | [diff] [blame] | 2245 | extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2246 | extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); |
| 2247 | |
Cedric Le Goater | 9ec5209 | 2006-10-02 02:19:00 -0700 | [diff] [blame] | 2248 | static inline int kill_cad_pid(int sig, int priv) |
| 2249 | { |
| 2250 | return kill_pid(cad_pid, sig, priv); |
| 2251 | } |
| 2252 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2253 | /* These can be the second arg to send_sig_info/send_group_sig_info. */ |
| 2254 | #define SEND_SIG_NOINFO ((struct siginfo *) 0) |
| 2255 | #define SEND_SIG_PRIV ((struct siginfo *) 1) |
| 2256 | #define SEND_SIG_FORCED ((struct siginfo *) 2) |
| 2257 | |
Sebastian Andrzej Siewior | 2a855dd | 2009-10-25 15:37:58 +0100 | [diff] [blame] | 2258 | /* |
| 2259 | * True if we are on the alternate signal stack. |
| 2260 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2261 | static inline int on_sig_stack(unsigned long sp) |
| 2262 | { |
Sebastian Andrzej Siewior | 2a855dd | 2009-10-25 15:37:58 +0100 | [diff] [blame] | 2263 | #ifdef CONFIG_STACK_GROWSUP |
| 2264 | return sp >= current->sas_ss_sp && |
| 2265 | sp - current->sas_ss_sp < current->sas_ss_size; |
| 2266 | #else |
| 2267 | return sp > current->sas_ss_sp && |
| 2268 | sp - current->sas_ss_sp <= current->sas_ss_size; |
| 2269 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2270 | } |
| 2271 | |
| 2272 | static inline int sas_ss_flags(unsigned long sp) |
| 2273 | { |
| 2274 | return (current->sas_ss_size == 0 ? SS_DISABLE |
| 2275 | : on_sig_stack(sp) ? SS_ONSTACK : 0); |
| 2276 | } |
| 2277 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2278 | /* |
| 2279 | * Routines for handling mm_structs |
| 2280 | */ |
| 2281 | extern struct mm_struct * mm_alloc(void); |
| 2282 | |
| 2283 | /* mmdrop drops the mm and the page tables */ |
Harvey Harrison | b3c9752 | 2008-02-13 15:03:15 -0800 | [diff] [blame] | 2284 | extern void __mmdrop(struct mm_struct *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2285 | static inline void mmdrop(struct mm_struct * mm) |
| 2286 | { |
Ingo Molnar | 6fb43d7 | 2007-07-09 18:52:01 +0200 | [diff] [blame] | 2287 | if (unlikely(atomic_dec_and_test(&mm->mm_count))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2288 | __mmdrop(mm); |
| 2289 | } |
| 2290 | |
| 2291 | /* mmput gets rid of the mappings and all user-space */ |
| 2292 | extern void mmput(struct mm_struct *); |
| 2293 | /* Grab a reference to a task's mm, if it is not already going away */ |
| 2294 | extern struct mm_struct *get_task_mm(struct task_struct *task); |
Christopher Yeoh | 8cdb878 | 2012-02-02 11:34:09 +1030 | [diff] [blame] | 2295 | /* |
| 2296 | * Grab a reference to a task's mm, if it is not already going away |
| 2297 | * and ptrace_may_access with the mode parameter passed to it |
| 2298 | * succeeds. |
| 2299 | */ |
| 2300 | extern struct mm_struct *mm_access(struct task_struct *task, unsigned int mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2301 | /* Remove the current tasks stale references to the old mm_struct */ |
| 2302 | extern void mm_release(struct task_struct *, struct mm_struct *); |
Carsten Otte | 402b086 | 2008-03-25 18:47:10 +0100 | [diff] [blame] | 2303 | /* Allocate a new mm structure and copy contents from tsk->mm */ |
| 2304 | extern struct mm_struct *dup_mm(struct task_struct *tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2305 | |
Alexey Dobriyan | 6f2c55b | 2009-04-02 16:56:59 -0700 | [diff] [blame] | 2306 | extern int copy_thread(unsigned long, unsigned long, unsigned long, |
| 2307 | struct task_struct *, struct pt_regs *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2308 | extern void flush_thread(void); |
| 2309 | extern void exit_thread(void); |
| 2310 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2311 | extern void exit_files(struct task_struct *); |
Oleg Nesterov | a7e5328 | 2006-03-28 16:11:27 -0800 | [diff] [blame] | 2312 | extern void __cleanup_sighand(struct sighand_struct *); |
Oleg Nesterov | cbaffba | 2008-05-26 20:55:42 +0400 | [diff] [blame] | 2313 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2314 | extern void exit_itimers(struct signal_struct *); |
Oleg Nesterov | cbaffba | 2008-05-26 20:55:42 +0400 | [diff] [blame] | 2315 | extern void flush_itimer_signals(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2316 | |
Joe Perches | 9402c95 | 2012-01-12 17:17:17 -0800 | [diff] [blame] | 2317 | extern void do_group_exit(int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2318 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2319 | extern void daemonize(const char *, ...); |
| 2320 | extern int allow_signal(int); |
| 2321 | extern int disallow_signal(int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2322 | |
David Howells | d762746 | 2010-08-17 23:52:56 +0100 | [diff] [blame] | 2323 | extern int do_execve(const char *, |
| 2324 | const char __user * const __user *, |
| 2325 | const char __user * const __user *, struct pt_regs *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2326 | extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *); |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 2327 | struct task_struct *fork_idle(int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2328 | |
| 2329 | extern void set_task_comm(struct task_struct *tsk, char *from); |
Andrew Morton | 59714d6 | 2008-02-04 22:27:21 -0800 | [diff] [blame] | 2330 | extern char *get_task_comm(char *to, struct task_struct *tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2331 | |
| 2332 | #ifdef CONFIG_SMP |
Peter Zijlstra | 317f394 | 2011-04-05 17:23:58 +0200 | [diff] [blame] | 2333 | void scheduler_ipi(void); |
Roland McGrath | 85ba2d8 | 2008-07-25 19:45:58 -0700 | [diff] [blame] | 2334 | extern unsigned long wait_task_inactive(struct task_struct *, long match_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2335 | #else |
Peter Zijlstra | 184748c | 2011-04-05 17:23:39 +0200 | [diff] [blame] | 2336 | static inline void scheduler_ipi(void) { } |
Roland McGrath | 85ba2d8 | 2008-07-25 19:45:58 -0700 | [diff] [blame] | 2337 | static inline unsigned long wait_task_inactive(struct task_struct *p, |
| 2338 | long match_state) |
| 2339 | { |
| 2340 | return 1; |
| 2341 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2342 | #endif |
| 2343 | |
Jiri Pirko | 05725f7 | 2009-04-14 20:17:16 +0200 | [diff] [blame] | 2344 | #define next_task(p) \ |
| 2345 | list_entry_rcu((p)->tasks.next, struct task_struct, tasks) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2346 | |
| 2347 | #define for_each_process(p) \ |
| 2348 | for (p = &init_task ; (p = next_task(p)) != &init_task ; ) |
| 2349 | |
Oleg Nesterov | 5bb459b | 2009-07-10 03:48:23 +0200 | [diff] [blame] | 2350 | extern bool current_is_single_threaded(void); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 2351 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2352 | /* |
| 2353 | * Careful: do_each_thread/while_each_thread is a double loop so |
| 2354 | * 'break' will not work as expected - use goto instead. |
| 2355 | */ |
| 2356 | #define do_each_thread(g, t) \ |
| 2357 | for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do |
| 2358 | |
| 2359 | #define while_each_thread(g, t) \ |
| 2360 | while ((t = next_thread(t)) != g) |
| 2361 | |
Oleg Nesterov | 7e49827 | 2010-05-26 14:43:22 -0700 | [diff] [blame] | 2362 | static inline int get_nr_threads(struct task_struct *tsk) |
| 2363 | { |
Oleg Nesterov | b3ac022 | 2010-05-26 14:43:24 -0700 | [diff] [blame] | 2364 | return tsk->signal->nr_threads; |
Oleg Nesterov | 7e49827 | 2010-05-26 14:43:22 -0700 | [diff] [blame] | 2365 | } |
| 2366 | |
Oleg Nesterov | 087806b | 2011-06-22 23:10:26 +0200 | [diff] [blame] | 2367 | static inline bool thread_group_leader(struct task_struct *p) |
| 2368 | { |
| 2369 | return p->exit_signal >= 0; |
| 2370 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2371 | |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 2372 | /* Do to the insanities of de_thread it is possible for a process |
| 2373 | * to have the pid of the thread group leader without actually being |
| 2374 | * the thread group leader. For iteration through the pids in proc |
| 2375 | * all we care about is that we have a task with the appropriate |
| 2376 | * pid, we don't actually care if we have the right task. |
| 2377 | */ |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 2378 | static inline int has_group_leader_pid(struct task_struct *p) |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 2379 | { |
| 2380 | return p->pid == p->tgid; |
| 2381 | } |
| 2382 | |
Pavel Emelyanov | bac0abd | 2007-10-18 23:40:18 -0700 | [diff] [blame] | 2383 | static inline |
| 2384 | int same_thread_group(struct task_struct *p1, struct task_struct *p2) |
| 2385 | { |
| 2386 | return p1->tgid == p2->tgid; |
| 2387 | } |
| 2388 | |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 2389 | static inline struct task_struct *next_thread(const struct task_struct *p) |
Oleg Nesterov | 47e6532 | 2006-03-28 16:11:25 -0800 | [diff] [blame] | 2390 | { |
Jiri Pirko | 05725f7 | 2009-04-14 20:17:16 +0200 | [diff] [blame] | 2391 | return list_entry_rcu(p->thread_group.next, |
| 2392 | struct task_struct, thread_group); |
Oleg Nesterov | 47e6532 | 2006-03-28 16:11:25 -0800 | [diff] [blame] | 2393 | } |
| 2394 | |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 2395 | static inline int thread_group_empty(struct task_struct *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2396 | { |
Oleg Nesterov | 47e6532 | 2006-03-28 16:11:25 -0800 | [diff] [blame] | 2397 | return list_empty(&p->thread_group); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2398 | } |
| 2399 | |
| 2400 | #define delay_group_leader(p) \ |
| 2401 | (thread_group_leader(p) && !thread_group_empty(p)) |
| 2402 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2403 | /* |
Eric W. Biederman | 260ea10 | 2006-06-23 02:05:18 -0700 | [diff] [blame] | 2404 | * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 2405 | * subscriptions and synchronises with wait4(). Also used in procfs. Also |
Paul Menage | ddbcc7e | 2007-10-18 23:39:30 -0700 | [diff] [blame] | 2406 | * pins the final release of task.io_context. Also protects ->cpuset and |
Oleg Nesterov | d68b46f | 2012-03-05 14:59:13 -0800 | [diff] [blame] | 2407 | * ->cgroup.subsys[]. And ->vfork_done. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2408 | * |
| 2409 | * Nests both inside and outside of read_lock(&tasklist_lock). |
| 2410 | * It must not be nested with write_lock_irq(&tasklist_lock), |
| 2411 | * neither inside nor outside. |
| 2412 | */ |
| 2413 | static inline void task_lock(struct task_struct *p) |
| 2414 | { |
| 2415 | spin_lock(&p->alloc_lock); |
| 2416 | } |
| 2417 | |
| 2418 | static inline void task_unlock(struct task_struct *p) |
| 2419 | { |
| 2420 | spin_unlock(&p->alloc_lock); |
| 2421 | } |
| 2422 | |
Namhyung Kim | b8ed374 | 2010-10-27 15:34:06 -0700 | [diff] [blame] | 2423 | extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk, |
Oleg Nesterov | f63ee72 | 2006-03-28 16:11:13 -0800 | [diff] [blame] | 2424 | unsigned long *flags); |
| 2425 | |
Anton Vorontsov | 9388dc3 | 2012-02-09 20:45:19 +0400 | [diff] [blame] | 2426 | static inline struct sighand_struct *lock_task_sighand(struct task_struct *tsk, |
| 2427 | unsigned long *flags) |
| 2428 | { |
| 2429 | struct sighand_struct *ret; |
| 2430 | |
| 2431 | ret = __lock_task_sighand(tsk, flags); |
| 2432 | (void)__cond_lock(&tsk->sighand->siglock, ret); |
| 2433 | return ret; |
| 2434 | } |
Namhyung Kim | b8ed374 | 2010-10-27 15:34:06 -0700 | [diff] [blame] | 2435 | |
Oleg Nesterov | f63ee72 | 2006-03-28 16:11:13 -0800 | [diff] [blame] | 2436 | static inline void unlock_task_sighand(struct task_struct *tsk, |
| 2437 | unsigned long *flags) |
| 2438 | { |
| 2439 | spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); |
| 2440 | } |
| 2441 | |
Ben Blum | 4714d1d | 2011-05-26 16:25:18 -0700 | [diff] [blame] | 2442 | #ifdef CONFIG_CGROUPS |
Tejun Heo | 257058a | 2011-12-12 18:12:21 -0800 | [diff] [blame] | 2443 | static inline void threadgroup_change_begin(struct task_struct *tsk) |
Ben Blum | 4714d1d | 2011-05-26 16:25:18 -0700 | [diff] [blame] | 2444 | { |
Tejun Heo | 257058a | 2011-12-12 18:12:21 -0800 | [diff] [blame] | 2445 | down_read(&tsk->signal->group_rwsem); |
Ben Blum | 4714d1d | 2011-05-26 16:25:18 -0700 | [diff] [blame] | 2446 | } |
Tejun Heo | 257058a | 2011-12-12 18:12:21 -0800 | [diff] [blame] | 2447 | static inline void threadgroup_change_end(struct task_struct *tsk) |
Ben Blum | 4714d1d | 2011-05-26 16:25:18 -0700 | [diff] [blame] | 2448 | { |
Tejun Heo | 257058a | 2011-12-12 18:12:21 -0800 | [diff] [blame] | 2449 | up_read(&tsk->signal->group_rwsem); |
Ben Blum | 4714d1d | 2011-05-26 16:25:18 -0700 | [diff] [blame] | 2450 | } |
Tejun Heo | 77e4ef9 | 2011-12-12 18:12:21 -0800 | [diff] [blame] | 2451 | |
| 2452 | /** |
| 2453 | * threadgroup_lock - lock threadgroup |
| 2454 | * @tsk: member task of the threadgroup to lock |
| 2455 | * |
| 2456 | * Lock the threadgroup @tsk belongs to. No new task is allowed to enter |
| 2457 | * and member tasks aren't allowed to exit (as indicated by PF_EXITING) or |
| 2458 | * perform exec. This is useful for cases where the threadgroup needs to |
| 2459 | * stay stable across blockable operations. |
| 2460 | * |
| 2461 | * fork and exit paths explicitly call threadgroup_change_{begin|end}() for |
| 2462 | * synchronization. While held, no new task will be added to threadgroup |
| 2463 | * and no existing live task will have its PF_EXITING set. |
| 2464 | * |
| 2465 | * During exec, a task goes and puts its thread group through unusual |
| 2466 | * changes. After de-threading, exclusive access is assumed to resources |
| 2467 | * which are usually shared by tasks in the same group - e.g. sighand may |
| 2468 | * be replaced with a new one. Also, the exec'ing task takes over group |
| 2469 | * leader role including its pid. Exclude these changes while locked by |
| 2470 | * grabbing cred_guard_mutex which is used to synchronize exec path. |
| 2471 | */ |
Tejun Heo | 257058a | 2011-12-12 18:12:21 -0800 | [diff] [blame] | 2472 | static inline void threadgroup_lock(struct task_struct *tsk) |
Ben Blum | 4714d1d | 2011-05-26 16:25:18 -0700 | [diff] [blame] | 2473 | { |
Tejun Heo | 77e4ef9 | 2011-12-12 18:12:21 -0800 | [diff] [blame] | 2474 | /* |
| 2475 | * exec uses exit for de-threading nesting group_rwsem inside |
| 2476 | * cred_guard_mutex. Grab cred_guard_mutex first. |
| 2477 | */ |
| 2478 | mutex_lock(&tsk->signal->cred_guard_mutex); |
Tejun Heo | 257058a | 2011-12-12 18:12:21 -0800 | [diff] [blame] | 2479 | down_write(&tsk->signal->group_rwsem); |
Ben Blum | 4714d1d | 2011-05-26 16:25:18 -0700 | [diff] [blame] | 2480 | } |
Tejun Heo | 77e4ef9 | 2011-12-12 18:12:21 -0800 | [diff] [blame] | 2481 | |
| 2482 | /** |
| 2483 | * threadgroup_unlock - unlock threadgroup |
| 2484 | * @tsk: member task of the threadgroup to unlock |
| 2485 | * |
| 2486 | * Reverse threadgroup_lock(). |
| 2487 | */ |
Tejun Heo | 257058a | 2011-12-12 18:12:21 -0800 | [diff] [blame] | 2488 | static inline void threadgroup_unlock(struct task_struct *tsk) |
Ben Blum | 4714d1d | 2011-05-26 16:25:18 -0700 | [diff] [blame] | 2489 | { |
Tejun Heo | 257058a | 2011-12-12 18:12:21 -0800 | [diff] [blame] | 2490 | up_write(&tsk->signal->group_rwsem); |
Tejun Heo | 77e4ef9 | 2011-12-12 18:12:21 -0800 | [diff] [blame] | 2491 | mutex_unlock(&tsk->signal->cred_guard_mutex); |
Ben Blum | 4714d1d | 2011-05-26 16:25:18 -0700 | [diff] [blame] | 2492 | } |
| 2493 | #else |
Tejun Heo | 257058a | 2011-12-12 18:12:21 -0800 | [diff] [blame] | 2494 | static inline void threadgroup_change_begin(struct task_struct *tsk) {} |
| 2495 | static inline void threadgroup_change_end(struct task_struct *tsk) {} |
| 2496 | static inline void threadgroup_lock(struct task_struct *tsk) {} |
| 2497 | static inline void threadgroup_unlock(struct task_struct *tsk) {} |
Ben Blum | 4714d1d | 2011-05-26 16:25:18 -0700 | [diff] [blame] | 2498 | #endif |
| 2499 | |
Al Viro | f037360 | 2005-11-13 16:06:57 -0800 | [diff] [blame] | 2500 | #ifndef __HAVE_THREAD_FUNCTIONS |
| 2501 | |
Roman Zippel | f7e4217 | 2007-05-09 02:35:17 -0700 | [diff] [blame] | 2502 | #define task_thread_info(task) ((struct thread_info *)(task)->stack) |
| 2503 | #define task_stack_page(task) ((task)->stack) |
Al Viro | a1261f5 | 2005-11-13 16:06:55 -0800 | [diff] [blame] | 2504 | |
Al Viro | 10ebffd | 2005-11-13 16:06:56 -0800 | [diff] [blame] | 2505 | static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) |
| 2506 | { |
| 2507 | *task_thread_info(p) = *task_thread_info(org); |
| 2508 | task_thread_info(p)->task = p; |
| 2509 | } |
| 2510 | |
| 2511 | static inline unsigned long *end_of_stack(struct task_struct *p) |
| 2512 | { |
Roman Zippel | f7e4217 | 2007-05-09 02:35:17 -0700 | [diff] [blame] | 2513 | return (unsigned long *)(task_thread_info(p) + 1); |
Al Viro | 10ebffd | 2005-11-13 16:06:56 -0800 | [diff] [blame] | 2514 | } |
| 2515 | |
Al Viro | f037360 | 2005-11-13 16:06:57 -0800 | [diff] [blame] | 2516 | #endif |
| 2517 | |
FUJITA Tomonori | 8b05c7e | 2008-07-23 21:26:53 -0700 | [diff] [blame] | 2518 | static inline int object_is_on_stack(void *obj) |
| 2519 | { |
| 2520 | void *stack = task_stack_page(current); |
| 2521 | |
| 2522 | return (obj >= stack) && (obj < (stack + THREAD_SIZE)); |
| 2523 | } |
| 2524 | |
Benjamin Herrenschmidt | 8c9843e | 2008-04-18 16:56:15 +1000 | [diff] [blame] | 2525 | extern void thread_info_cache_init(void); |
| 2526 | |
Eric Sandeen | 7c9f886 | 2008-04-22 16:38:23 -0500 | [diff] [blame] | 2527 | #ifdef CONFIG_DEBUG_STACK_USAGE |
| 2528 | static inline unsigned long stack_not_used(struct task_struct *p) |
| 2529 | { |
| 2530 | unsigned long *n = end_of_stack(p); |
| 2531 | |
| 2532 | do { /* Skip over canary */ |
| 2533 | n++; |
| 2534 | } while (!*n); |
| 2535 | |
| 2536 | return (unsigned long)n - (unsigned long)end_of_stack(p); |
| 2537 | } |
| 2538 | #endif |
| 2539 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2540 | /* set thread flags in other task's structures |
| 2541 | * - see asm/thread_info.h for TIF_xxxx flags available |
| 2542 | */ |
| 2543 | static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) |
| 2544 | { |
Al Viro | a1261f5 | 2005-11-13 16:06:55 -0800 | [diff] [blame] | 2545 | set_ti_thread_flag(task_thread_info(tsk), flag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2546 | } |
| 2547 | |
| 2548 | static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) |
| 2549 | { |
Al Viro | a1261f5 | 2005-11-13 16:06:55 -0800 | [diff] [blame] | 2550 | clear_ti_thread_flag(task_thread_info(tsk), flag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2551 | } |
| 2552 | |
| 2553 | static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) |
| 2554 | { |
Al Viro | a1261f5 | 2005-11-13 16:06:55 -0800 | [diff] [blame] | 2555 | return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2556 | } |
| 2557 | |
| 2558 | static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) |
| 2559 | { |
Al Viro | a1261f5 | 2005-11-13 16:06:55 -0800 | [diff] [blame] | 2560 | return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2561 | } |
| 2562 | |
| 2563 | static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) |
| 2564 | { |
Al Viro | a1261f5 | 2005-11-13 16:06:55 -0800 | [diff] [blame] | 2565 | return test_ti_thread_flag(task_thread_info(tsk), flag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2566 | } |
| 2567 | |
| 2568 | static inline void set_tsk_need_resched(struct task_struct *tsk) |
| 2569 | { |
| 2570 | set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); |
| 2571 | } |
| 2572 | |
| 2573 | static inline void clear_tsk_need_resched(struct task_struct *tsk) |
| 2574 | { |
| 2575 | clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); |
| 2576 | } |
| 2577 | |
Gregory Haskins | 8ae121a | 2008-04-23 07:13:29 -0400 | [diff] [blame] | 2578 | static inline int test_tsk_need_resched(struct task_struct *tsk) |
| 2579 | { |
| 2580 | return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); |
| 2581 | } |
| 2582 | |
Eric W. Biederman | 690cc3f | 2009-05-13 16:55:10 +0000 | [diff] [blame] | 2583 | static inline int restart_syscall(void) |
| 2584 | { |
| 2585 | set_tsk_thread_flag(current, TIF_SIGPENDING); |
| 2586 | return -ERESTARTNOINTR; |
| 2587 | } |
| 2588 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2589 | static inline int signal_pending(struct task_struct *p) |
| 2590 | { |
| 2591 | return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); |
| 2592 | } |
Matthew Wilcox | f776d12 | 2007-12-06 11:15:50 -0500 | [diff] [blame] | 2593 | |
Roland McGrath | d958872 | 2009-09-23 15:57:04 -0700 | [diff] [blame] | 2594 | static inline int __fatal_signal_pending(struct task_struct *p) |
| 2595 | { |
| 2596 | return unlikely(sigismember(&p->pending.signal, SIGKILL)); |
| 2597 | } |
Matthew Wilcox | f776d12 | 2007-12-06 11:15:50 -0500 | [diff] [blame] | 2598 | |
| 2599 | static inline int fatal_signal_pending(struct task_struct *p) |
| 2600 | { |
| 2601 | return signal_pending(p) && __fatal_signal_pending(p); |
| 2602 | } |
| 2603 | |
Oleg Nesterov | 16882c1 | 2008-06-08 21:20:41 +0400 | [diff] [blame] | 2604 | static inline int signal_pending_state(long state, struct task_struct *p) |
| 2605 | { |
| 2606 | if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL))) |
| 2607 | return 0; |
| 2608 | if (!signal_pending(p)) |
| 2609 | return 0; |
| 2610 | |
Oleg Nesterov | 16882c1 | 2008-06-08 21:20:41 +0400 | [diff] [blame] | 2611 | return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p); |
| 2612 | } |
| 2613 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2614 | static inline int need_resched(void) |
| 2615 | { |
Linus Torvalds | 9404ef0 | 2008-05-12 10:14:22 -0700 | [diff] [blame] | 2616 | return unlikely(test_thread_flag(TIF_NEED_RESCHED)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2617 | } |
| 2618 | |
| 2619 | /* |
| 2620 | * cond_resched() and cond_resched_lock(): latency reduction via |
| 2621 | * explicit rescheduling in places that are safe. The return |
| 2622 | * value indicates whether a reschedule was done in fact. |
| 2623 | * cond_resched_lock() will drop the spinlock before scheduling, |
| 2624 | * cond_resched_softirq() will enable bhs before scheduling. |
| 2625 | */ |
Linus Torvalds | c3921ab | 2008-05-11 16:04:48 -0700 | [diff] [blame] | 2626 | extern int _cond_resched(void); |
Frederic Weisbecker | 6f80bd9 | 2009-07-16 15:44:29 +0200 | [diff] [blame] | 2627 | |
Frederic Weisbecker | 613afbf | 2009-07-16 15:44:29 +0200 | [diff] [blame] | 2628 | #define cond_resched() ({ \ |
| 2629 | __might_sleep(__FILE__, __LINE__, 0); \ |
| 2630 | _cond_resched(); \ |
| 2631 | }) |
Frederic Weisbecker | 6f80bd9 | 2009-07-16 15:44:29 +0200 | [diff] [blame] | 2632 | |
Frederic Weisbecker | 613afbf | 2009-07-16 15:44:29 +0200 | [diff] [blame] | 2633 | extern int __cond_resched_lock(spinlock_t *lock); |
| 2634 | |
Frederic Weisbecker | bdd4e85 | 2011-06-08 01:13:27 +0200 | [diff] [blame] | 2635 | #ifdef CONFIG_PREEMPT_COUNT |
Frederic Weisbecker | 716a423 | 2009-07-24 20:05:23 +0200 | [diff] [blame] | 2636 | #define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET |
Herbert Xu | 02b67cc3 | 2008-01-25 21:08:28 +0100 | [diff] [blame] | 2637 | #else |
Frederic Weisbecker | 716a423 | 2009-07-24 20:05:23 +0200 | [diff] [blame] | 2638 | #define PREEMPT_LOCK_OFFSET 0 |
Herbert Xu | 02b67cc3 | 2008-01-25 21:08:28 +0100 | [diff] [blame] | 2639 | #endif |
Frederic Weisbecker | 716a423 | 2009-07-24 20:05:23 +0200 | [diff] [blame] | 2640 | |
Frederic Weisbecker | 613afbf | 2009-07-16 15:44:29 +0200 | [diff] [blame] | 2641 | #define cond_resched_lock(lock) ({ \ |
Frederic Weisbecker | 716a423 | 2009-07-24 20:05:23 +0200 | [diff] [blame] | 2642 | __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \ |
Frederic Weisbecker | 613afbf | 2009-07-16 15:44:29 +0200 | [diff] [blame] | 2643 | __cond_resched_lock(lock); \ |
| 2644 | }) |
| 2645 | |
| 2646 | extern int __cond_resched_softirq(void); |
| 2647 | |
Venkatesh Pallipadi | 75e1056 | 2010-10-04 17:03:16 -0700 | [diff] [blame] | 2648 | #define cond_resched_softirq() ({ \ |
| 2649 | __might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \ |
| 2650 | __cond_resched_softirq(); \ |
Frederic Weisbecker | 613afbf | 2009-07-16 15:44:29 +0200 | [diff] [blame] | 2651 | }) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2652 | |
| 2653 | /* |
| 2654 | * Does a critical section need to be broken due to another |
Nick Piggin | 95c354f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 2655 | * task waiting?: (technically does not depend on CONFIG_PREEMPT, |
| 2656 | * but a general need for low latency) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2657 | */ |
Nick Piggin | 95c354f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 2658 | static inline int spin_needbreak(spinlock_t *lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2659 | { |
Nick Piggin | 95c354f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 2660 | #ifdef CONFIG_PREEMPT |
| 2661 | return spin_is_contended(lock); |
| 2662 | #else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2663 | return 0; |
Nick Piggin | 95c354f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 2664 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2665 | } |
| 2666 | |
Roland McGrath | 7bb44ad | 2007-05-23 13:57:44 -0700 | [diff] [blame] | 2667 | /* |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 2668 | * Thread group CPU time accounting. |
| 2669 | */ |
Peter Zijlstra | 4cd4c1b | 2009-02-05 12:24:16 +0100 | [diff] [blame] | 2670 | void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times); |
Peter Zijlstra | 4da94d49 | 2009-02-11 11:30:27 +0100 | [diff] [blame] | 2671 | void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times); |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 2672 | |
| 2673 | static inline void thread_group_cputime_init(struct signal_struct *sig) |
| 2674 | { |
Thomas Gleixner | ee30a7b | 2009-07-25 18:56:56 +0200 | [diff] [blame] | 2675 | raw_spin_lock_init(&sig->cputimer.lock); |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 2676 | } |
| 2677 | |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 2678 | /* |
Roland McGrath | 7bb44ad | 2007-05-23 13:57:44 -0700 | [diff] [blame] | 2679 | * Reevaluate whether the task has signals pending delivery. |
| 2680 | * Wake the task if so. |
| 2681 | * This is required every time the blocked sigset_t changes. |
| 2682 | * callers must hold sighand->siglock. |
| 2683 | */ |
| 2684 | extern void recalc_sigpending_and_wake(struct task_struct *t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2685 | extern void recalc_sigpending(void); |
| 2686 | |
| 2687 | extern void signal_wake_up(struct task_struct *t, int resume_stopped); |
| 2688 | |
| 2689 | /* |
| 2690 | * Wrappers for p->thread_info->cpu access. No-op on UP. |
| 2691 | */ |
| 2692 | #ifdef CONFIG_SMP |
| 2693 | |
| 2694 | static inline unsigned int task_cpu(const struct task_struct *p) |
| 2695 | { |
Al Viro | a1261f5 | 2005-11-13 16:06:55 -0800 | [diff] [blame] | 2696 | return task_thread_info(p)->cpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2697 | } |
| 2698 | |
Ingo Molnar | c65cc87 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 2699 | extern void set_task_cpu(struct task_struct *p, unsigned int cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2700 | |
| 2701 | #else |
| 2702 | |
| 2703 | static inline unsigned int task_cpu(const struct task_struct *p) |
| 2704 | { |
| 2705 | return 0; |
| 2706 | } |
| 2707 | |
| 2708 | static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) |
| 2709 | { |
| 2710 | } |
| 2711 | |
| 2712 | #endif /* CONFIG_SMP */ |
| 2713 | |
Rusty Russell | 96f874e | 2008-11-25 02:35:14 +1030 | [diff] [blame] | 2714 | extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); |
| 2715 | extern long sched_getaffinity(pid_t pid, struct cpumask *mask); |
Siddha, Suresh B | 5c45bf2 | 2006-06-27 02:54:42 -0700 | [diff] [blame] | 2716 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2717 | extern void normalize_rt_tasks(void); |
| 2718 | |
Dhaval Giani | 7c94143 | 2010-01-20 13:26:18 +0100 | [diff] [blame] | 2719 | #ifdef CONFIG_CGROUP_SCHED |
Srivatsa Vaddagiri | 9b5b775 | 2007-10-15 17:00:09 +0200 | [diff] [blame] | 2720 | |
Yong Zhang | 07e06b0 | 2011-01-07 15:17:36 +0800 | [diff] [blame] | 2721 | extern struct task_group root_task_group; |
Srivatsa Vaddagiri | 9b5b775 | 2007-10-15 17:00:09 +0200 | [diff] [blame] | 2722 | |
Dhaval Giani | ec7dc8a | 2008-04-19 19:44:59 +0200 | [diff] [blame] | 2723 | extern struct task_group *sched_create_group(struct task_group *parent); |
Ingo Molnar | 4cf86d7 | 2007-10-15 17:00:14 +0200 | [diff] [blame] | 2724 | extern void sched_destroy_group(struct task_group *tg); |
Srivatsa Vaddagiri | 9b5b775 | 2007-10-15 17:00:09 +0200 | [diff] [blame] | 2725 | extern void sched_move_task(struct task_struct *tsk); |
Peter Zijlstra | 052f1dc | 2008-02-13 15:45:40 +0100 | [diff] [blame] | 2726 | #ifdef CONFIG_FAIR_GROUP_SCHED |
Ingo Molnar | 4cf86d7 | 2007-10-15 17:00:14 +0200 | [diff] [blame] | 2727 | extern int sched_group_set_shares(struct task_group *tg, unsigned long shares); |
Dhaval Giani | 5cb350b | 2007-10-15 17:00:14 +0200 | [diff] [blame] | 2728 | extern unsigned long sched_group_shares(struct task_group *tg); |
Peter Zijlstra | 052f1dc | 2008-02-13 15:45:40 +0100 | [diff] [blame] | 2729 | #endif |
| 2730 | #ifdef CONFIG_RT_GROUP_SCHED |
Peter Zijlstra | 9f0c1e5 | 2008-02-13 15:45:39 +0100 | [diff] [blame] | 2731 | extern int sched_group_set_rt_runtime(struct task_group *tg, |
| 2732 | long rt_runtime_us); |
| 2733 | extern long sched_group_rt_runtime(struct task_group *tg); |
Peter Zijlstra | d0b27fa | 2008-04-19 19:44:57 +0200 | [diff] [blame] | 2734 | extern int sched_group_set_rt_period(struct task_group *tg, |
| 2735 | long rt_period_us); |
| 2736 | extern long sched_group_rt_period(struct task_group *tg); |
Dhaval Giani | 54e9912 | 2009-02-27 15:13:54 +0530 | [diff] [blame] | 2737 | extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk); |
Peter Zijlstra | 052f1dc | 2008-02-13 15:45:40 +0100 | [diff] [blame] | 2738 | #endif |
Srivatsa Vaddagiri | 9b5b775 | 2007-10-15 17:00:09 +0200 | [diff] [blame] | 2739 | #endif |
| 2740 | |
Dhaval Giani | 54e9912 | 2009-02-27 15:13:54 +0530 | [diff] [blame] | 2741 | extern int task_can_switch_user(struct user_struct *up, |
| 2742 | struct task_struct *tsk); |
| 2743 | |
Alexey Dobriyan | 4b98d11 | 2007-02-10 01:46:45 -0800 | [diff] [blame] | 2744 | #ifdef CONFIG_TASK_XACCT |
| 2745 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) |
| 2746 | { |
Andrea Righi | 940389b | 2008-07-28 00:48:12 +0200 | [diff] [blame] | 2747 | tsk->ioac.rchar += amt; |
Alexey Dobriyan | 4b98d11 | 2007-02-10 01:46:45 -0800 | [diff] [blame] | 2748 | } |
| 2749 | |
| 2750 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) |
| 2751 | { |
Andrea Righi | 940389b | 2008-07-28 00:48:12 +0200 | [diff] [blame] | 2752 | tsk->ioac.wchar += amt; |
Alexey Dobriyan | 4b98d11 | 2007-02-10 01:46:45 -0800 | [diff] [blame] | 2753 | } |
| 2754 | |
| 2755 | static inline void inc_syscr(struct task_struct *tsk) |
| 2756 | { |
Andrea Righi | 940389b | 2008-07-28 00:48:12 +0200 | [diff] [blame] | 2757 | tsk->ioac.syscr++; |
Alexey Dobriyan | 4b98d11 | 2007-02-10 01:46:45 -0800 | [diff] [blame] | 2758 | } |
| 2759 | |
| 2760 | static inline void inc_syscw(struct task_struct *tsk) |
| 2761 | { |
Andrea Righi | 940389b | 2008-07-28 00:48:12 +0200 | [diff] [blame] | 2762 | tsk->ioac.syscw++; |
Alexey Dobriyan | 4b98d11 | 2007-02-10 01:46:45 -0800 | [diff] [blame] | 2763 | } |
| 2764 | #else |
| 2765 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) |
| 2766 | { |
| 2767 | } |
| 2768 | |
| 2769 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) |
| 2770 | { |
| 2771 | } |
| 2772 | |
| 2773 | static inline void inc_syscr(struct task_struct *tsk) |
| 2774 | { |
| 2775 | } |
| 2776 | |
| 2777 | static inline void inc_syscw(struct task_struct *tsk) |
| 2778 | { |
| 2779 | } |
| 2780 | #endif |
| 2781 | |
Dave Hansen | 8245525 | 2008-02-04 22:28:59 -0800 | [diff] [blame] | 2782 | #ifndef TASK_SIZE_OF |
| 2783 | #define TASK_SIZE_OF(tsk) TASK_SIZE |
| 2784 | #endif |
| 2785 | |
Balbir Singh | cf475ad | 2008-04-29 01:00:16 -0700 | [diff] [blame] | 2786 | #ifdef CONFIG_MM_OWNER |
| 2787 | extern void mm_update_next_owner(struct mm_struct *mm); |
| 2788 | extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p); |
| 2789 | #else |
| 2790 | static inline void mm_update_next_owner(struct mm_struct *mm) |
| 2791 | { |
| 2792 | } |
| 2793 | |
| 2794 | static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p) |
| 2795 | { |
| 2796 | } |
| 2797 | #endif /* CONFIG_MM_OWNER */ |
| 2798 | |
Jiri Slaby | 3e10e71 | 2009-11-19 17:16:37 +0100 | [diff] [blame] | 2799 | static inline unsigned long task_rlimit(const struct task_struct *tsk, |
| 2800 | unsigned int limit) |
| 2801 | { |
| 2802 | return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur); |
| 2803 | } |
| 2804 | |
| 2805 | static inline unsigned long task_rlimit_max(const struct task_struct *tsk, |
| 2806 | unsigned int limit) |
| 2807 | { |
| 2808 | return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max); |
| 2809 | } |
| 2810 | |
| 2811 | static inline unsigned long rlimit(unsigned int limit) |
| 2812 | { |
| 2813 | return task_rlimit(current, limit); |
| 2814 | } |
| 2815 | |
| 2816 | static inline unsigned long rlimit_max(unsigned int limit) |
| 2817 | { |
| 2818 | return task_rlimit_max(current, limit); |
| 2819 | } |
| 2820 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2821 | #endif /* __KERNEL__ */ |
| 2822 | |
| 2823 | #endif |