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 | |
| 66 | #include <asm/system.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | #include <asm/page.h> |
| 68 | #include <asm/ptrace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | #include <asm/cputime.h> |
| 70 | |
| 71 | #include <linux/smp.h> |
| 72 | #include <linux/sem.h> |
| 73 | #include <linux/signal.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | #include <linux/compiler.h> |
| 75 | #include <linux/completion.h> |
| 76 | #include <linux/pid.h> |
| 77 | #include <linux/percpu.h> |
| 78 | #include <linux/topology.h> |
Peter Zijlstra | 3e26c14 | 2007-10-16 23:25:50 -0700 | [diff] [blame] | 79 | #include <linux/proportions.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | #include <linux/seccomp.h> |
Ingo Molnar | e56d090 | 2006-01-08 01:01:37 -0800 | [diff] [blame] | 81 | #include <linux/rcupdate.h> |
Jiri Pirko | 05725f7 | 2009-04-14 20:17:16 +0200 | [diff] [blame] | 82 | #include <linux/rculist.h> |
Ingo Molnar | 23f78d4a | 2006-06-27 02:54:53 -0700 | [diff] [blame] | 83 | #include <linux/rtmutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | |
David Woodhouse | a3b6714 | 2006-04-25 14:54:40 +0100 | [diff] [blame] | 85 | #include <linux/time.h> |
| 86 | #include <linux/param.h> |
| 87 | #include <linux/resource.h> |
| 88 | #include <linux/timer.h> |
| 89 | #include <linux/hrtimer.h> |
Andrew Morton | 7c3ab73 | 2006-12-10 02:19:19 -0800 | [diff] [blame] | 90 | #include <linux/task_io_accounting.h> |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 91 | #include <linux/latencytop.h> |
David Howells | 9e2b2dc | 2008-08-13 16:20:04 +0100 | [diff] [blame] | 92 | #include <linux/cred.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 && \ |
Thomas Gleixner | 6301cb9 | 2009-07-17 14:15:47 +0200 | [diff] [blame] | 222 | (task->flags & PF_FREEZING) == 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 | |
Rusty Russell | 6a7b3dc | 2008-11-25 02:35:04 +1030 | [diff] [blame] | 273 | extern cpumask_var_t nohz_cpu_mask; |
Siddha, Suresh B | 46cb4b7 | 2007-05-08 00:32:51 -0700 | [diff] [blame] | 274 | #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ) |
Venkatesh Pallipadi | 83cd4fe | 2010-05-21 17:09:41 -0700 | [diff] [blame] | 275 | extern void select_nohz_load_balancer(int stop_tick); |
| 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) { } |
Siddha, Suresh B | 46cb4b7 | 2007-05-08 00:32:51 -0700 | [diff] [blame] | 279 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | |
Ingo Molnar | e59e2ae | 2006-12-06 20:35:59 -0800 | [diff] [blame] | 281 | /* |
Ingo Molnar | 39bc89f | 2007-04-25 20:50:03 -0700 | [diff] [blame] | 282 | * Only dump TASK_* tasks. (0 for all tasks) |
Ingo Molnar | e59e2ae | 2006-12-06 20:35:59 -0800 | [diff] [blame] | 283 | */ |
| 284 | extern void show_state_filter(unsigned long state_filter); |
| 285 | |
| 286 | static inline void show_state(void) |
| 287 | { |
Ingo Molnar | 39bc89f | 2007-04-25 20:50:03 -0700 | [diff] [blame] | 288 | show_state_filter(0); |
Ingo Molnar | e59e2ae | 2006-12-06 20:35:59 -0800 | [diff] [blame] | 289 | } |
| 290 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | extern void show_regs(struct pt_regs *); |
| 292 | |
| 293 | /* |
| 294 | * TASK is a pointer to the task whose backtrace we want to see (or NULL for current |
| 295 | * task), SP is the stack pointer of the first frame that should be shown in the back |
| 296 | * trace (or NULL if the entire call-chain of the task should be shown). |
| 297 | */ |
| 298 | extern void show_stack(struct task_struct *task, unsigned long *sp); |
| 299 | |
| 300 | void io_schedule(void); |
| 301 | long io_schedule_timeout(long timeout); |
| 302 | |
| 303 | extern void cpu_init (void); |
| 304 | extern void trap_init(void); |
| 305 | extern void update_process_times(int user); |
| 306 | extern void scheduler_tick(void); |
| 307 | |
Ingo Molnar | 82a1fcb | 2008-01-25 21:08:02 +0100 | [diff] [blame] | 308 | extern void sched_show_task(struct task_struct *p); |
| 309 | |
Frederic Weisbecker | 19cc36c | 2010-05-13 02:30:49 +0200 | [diff] [blame] | 310 | #ifdef CONFIG_LOCKUP_DETECTOR |
Ingo Molnar | 8446f1d | 2005-09-06 15:16:27 -0700 | [diff] [blame] | 311 | extern void touch_softlockup_watchdog(void); |
Jason Wessel | d6ad3e2 | 2010-01-27 16:25:22 -0600 | [diff] [blame] | 312 | extern void touch_softlockup_watchdog_sync(void); |
Jeremy Fitzhardinge | 04c9167 | 2007-05-08 00:28:05 -0700 | [diff] [blame] | 313 | extern void touch_all_softlockup_watchdogs(void); |
Don Zickus | 332fbdb | 2010-05-07 17:11:45 -0400 | [diff] [blame] | 314 | extern int proc_dowatchdog_thresh(struct ctl_table *table, int write, |
| 315 | void __user *buffer, |
| 316 | size_t *lenp, loff_t *ppos); |
Ingo Molnar | 9c44bc0 | 2008-05-12 21:21:04 +0200 | [diff] [blame] | 317 | extern unsigned int softlockup_panic; |
Peter Zijlstra | 004417a | 2010-11-25 18:38:29 +0100 | [diff] [blame] | 318 | void lockup_detector_init(void); |
Ingo Molnar | 8446f1d | 2005-09-06 15:16:27 -0700 | [diff] [blame] | 319 | #else |
Ingo Molnar | 8446f1d | 2005-09-06 15:16:27 -0700 | [diff] [blame] | 320 | static inline void touch_softlockup_watchdog(void) |
| 321 | { |
| 322 | } |
Jason Wessel | d6ad3e2 | 2010-01-27 16:25:22 -0600 | [diff] [blame] | 323 | static inline void touch_softlockup_watchdog_sync(void) |
| 324 | { |
| 325 | } |
Jeremy Fitzhardinge | 04c9167 | 2007-05-08 00:28:05 -0700 | [diff] [blame] | 326 | static inline void touch_all_softlockup_watchdogs(void) |
| 327 | { |
| 328 | } |
Peter Zijlstra | 004417a | 2010-11-25 18:38:29 +0100 | [diff] [blame] | 329 | static inline void lockup_detector_init(void) |
| 330 | { |
| 331 | } |
Ingo Molnar | 8446f1d | 2005-09-06 15:16:27 -0700 | [diff] [blame] | 332 | #endif |
| 333 | |
Mandeep Singh Baines | e162b39 | 2009-01-15 11:08:40 -0800 | [diff] [blame] | 334 | #ifdef CONFIG_DETECT_HUNG_TASK |
| 335 | extern unsigned int sysctl_hung_task_panic; |
| 336 | extern unsigned long sysctl_hung_task_check_count; |
| 337 | extern unsigned long sysctl_hung_task_timeout_secs; |
| 338 | extern unsigned long sysctl_hung_task_warnings; |
| 339 | 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] | 340 | void __user *buffer, |
Mandeep Singh Baines | e162b39 | 2009-01-15 11:08:40 -0800 | [diff] [blame] | 341 | size_t *lenp, loff_t *ppos); |
Mark Lord | e4ecda1 | 2010-09-25 11:17:22 +0200 | [diff] [blame] | 342 | #else |
| 343 | /* Avoid need for ifdefs elsewhere in the code */ |
| 344 | enum { sysctl_hung_task_timeout_secs = 0 }; |
Mandeep Singh Baines | e162b39 | 2009-01-15 11:08:40 -0800 | [diff] [blame] | 345 | #endif |
Ingo Molnar | 8446f1d | 2005-09-06 15:16:27 -0700 | [diff] [blame] | 346 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | /* Attach to any functions which should be ignored in wchan output. */ |
| 348 | #define __sched __attribute__((__section__(".sched.text"))) |
Ingo Molnar | deaf222 | 2007-11-28 15:52:56 +0100 | [diff] [blame] | 349 | |
| 350 | /* Linker adds these: start and end of __sched functions */ |
| 351 | extern char __sched_text_start[], __sched_text_end[]; |
| 352 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | /* Is this address in the __sched functions? */ |
| 354 | extern int in_sched_functions(unsigned long addr); |
| 355 | |
| 356 | #define MAX_SCHEDULE_TIMEOUT LONG_MAX |
Harvey Harrison | b3c9752 | 2008-02-13 15:03:15 -0800 | [diff] [blame] | 357 | extern signed long schedule_timeout(signed long timeout); |
Nishanth Aravamudan | 64ed93a | 2005-09-10 00:27:21 -0700 | [diff] [blame] | 358 | extern signed long schedule_timeout_interruptible(signed long timeout); |
Matthew Wilcox | 294d5cc | 2007-12-06 11:59:46 -0500 | [diff] [blame] | 359 | extern signed long schedule_timeout_killable(signed long timeout); |
Nishanth Aravamudan | 64ed93a | 2005-09-10 00:27:21 -0700 | [diff] [blame] | 360 | extern signed long schedule_timeout_uninterruptible(signed long timeout); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | asmlinkage void schedule(void); |
Peter Zijlstra | c6eb3dd | 2011-04-05 17:23:41 +0200 | [diff] [blame] | 362 | 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] | 363 | |
Serge E. Hallyn | ab51601 | 2006-10-02 02:18:06 -0700 | [diff] [blame] | 364 | struct nsproxy; |
Cedric Le Goater | acce292 | 2007-07-15 23:40:59 -0700 | [diff] [blame] | 365 | struct user_namespace; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | |
KAMEZAWA Hiroyuki | 341c87b | 2009-06-30 11:41:23 -0700 | [diff] [blame] | 367 | /* |
| 368 | * Default maximum number of active map areas, this limits the number of vmas |
| 369 | * per mm struct. Users can overwrite this number by sysctl but there is a |
| 370 | * problem. |
| 371 | * |
| 372 | * When a program's coredump is generated as ELF format, a section is created |
| 373 | * per a vma. In ELF, the number of sections is represented in unsigned short. |
| 374 | * This means the number of sections should be smaller than 65535 at coredump. |
| 375 | * Because the kernel adds some informative sections to a image of program at |
| 376 | * generating coredump, we need some margin. The number of extra sections is |
| 377 | * 1-3 now and depends on arch. We use "5" as safe margin, here. |
| 378 | */ |
| 379 | #define MAPCOUNT_ELF_CORE_MARGIN (5) |
Alexey Dobriyan | 4be929b | 2010-05-24 14:33:03 -0700 | [diff] [blame] | 380 | #define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | |
| 382 | extern int sysctl_max_map_count; |
| 383 | |
| 384 | #include <linux/aio.h> |
| 385 | |
David Howells | efc1a3b | 2010-01-15 17:01:35 -0800 | [diff] [blame] | 386 | #ifdef CONFIG_MMU |
| 387 | extern void arch_pick_mmap_layout(struct mm_struct *mm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | extern unsigned long |
| 389 | arch_get_unmapped_area(struct file *, unsigned long, unsigned long, |
| 390 | unsigned long, unsigned long); |
| 391 | extern unsigned long |
| 392 | arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, |
| 393 | unsigned long len, unsigned long pgoff, |
| 394 | unsigned long flags); |
Wolfgang Wander | 1363c3c | 2005-06-21 17:14:49 -0700 | [diff] [blame] | 395 | extern void arch_unmap_area(struct mm_struct *, unsigned long); |
| 396 | extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long); |
David Howells | efc1a3b | 2010-01-15 17:01:35 -0800 | [diff] [blame] | 397 | #else |
| 398 | static inline void arch_pick_mmap_layout(struct mm_struct *mm) {} |
| 399 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | |
Oleg Nesterov | 901608d | 2009-01-06 14:40:29 -0800 | [diff] [blame] | 401 | |
Kawai, Hidehiro | 6c5d523 | 2007-07-19 01:48:27 -0700 | [diff] [blame] | 402 | extern void set_dumpable(struct mm_struct *mm, int value); |
| 403 | extern int get_dumpable(struct mm_struct *mm); |
| 404 | |
| 405 | /* mm flags */ |
Kawai, Hidehiro | 3cb4a0b | 2007-07-19 01:48:28 -0700 | [diff] [blame] | 406 | /* dumpable bits */ |
Kawai, Hidehiro | 6c5d523 | 2007-07-19 01:48:27 -0700 | [diff] [blame] | 407 | #define MMF_DUMPABLE 0 /* core dump is permitted */ |
| 408 | #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */ |
Hugh Dickins | f8af4da | 2009-09-21 17:01:57 -0700 | [diff] [blame] | 409 | |
Kawai, Hidehiro | 3cb4a0b | 2007-07-19 01:48:28 -0700 | [diff] [blame] | 410 | #define MMF_DUMPABLE_BITS 2 |
Hugh Dickins | f8af4da | 2009-09-21 17:01:57 -0700 | [diff] [blame] | 411 | #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1) |
Kawai, Hidehiro | 3cb4a0b | 2007-07-19 01:48:28 -0700 | [diff] [blame] | 412 | |
| 413 | /* coredump filter bits */ |
| 414 | #define MMF_DUMP_ANON_PRIVATE 2 |
| 415 | #define MMF_DUMP_ANON_SHARED 3 |
| 416 | #define MMF_DUMP_MAPPED_PRIVATE 4 |
| 417 | #define MMF_DUMP_MAPPED_SHARED 5 |
Roland McGrath | 82df397 | 2007-10-16 23:27:02 -0700 | [diff] [blame] | 418 | #define MMF_DUMP_ELF_HEADERS 6 |
KOSAKI Motohiro | e575f11 | 2008-10-18 20:27:08 -0700 | [diff] [blame] | 419 | #define MMF_DUMP_HUGETLB_PRIVATE 7 |
| 420 | #define MMF_DUMP_HUGETLB_SHARED 8 |
Hugh Dickins | f8af4da | 2009-09-21 17:01:57 -0700 | [diff] [blame] | 421 | |
Kawai, Hidehiro | 3cb4a0b | 2007-07-19 01:48:28 -0700 | [diff] [blame] | 422 | #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS |
KOSAKI Motohiro | e575f11 | 2008-10-18 20:27:08 -0700 | [diff] [blame] | 423 | #define MMF_DUMP_FILTER_BITS 7 |
Kawai, Hidehiro | 3cb4a0b | 2007-07-19 01:48:28 -0700 | [diff] [blame] | 424 | #define MMF_DUMP_FILTER_MASK \ |
| 425 | (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT) |
| 426 | #define MMF_DUMP_FILTER_DEFAULT \ |
KOSAKI Motohiro | e575f11 | 2008-10-18 20:27:08 -0700 | [diff] [blame] | 427 | ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\ |
Roland McGrath | 656eb2c | 2008-10-18 20:28:23 -0700 | [diff] [blame] | 428 | (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF) |
| 429 | |
| 430 | #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS |
| 431 | # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS) |
| 432 | #else |
| 433 | # define MMF_DUMP_MASK_DEFAULT_ELF 0 |
| 434 | #endif |
Hugh Dickins | f8af4da | 2009-09-21 17:01:57 -0700 | [diff] [blame] | 435 | /* leave room for more dump flags */ |
| 436 | #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */ |
Andrea Arcangeli | ba76149 | 2011-01-13 15:46:58 -0800 | [diff] [blame] | 437 | #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] | 438 | |
| 439 | #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK) |
Kawai, Hidehiro | 6c5d523 | 2007-07-19 01:48:27 -0700 | [diff] [blame] | 440 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | struct sighand_struct { |
| 442 | atomic_t count; |
| 443 | struct k_sigaction action[_NSIG]; |
| 444 | spinlock_t siglock; |
Davide Libenzi | b8fceee | 2007-09-20 12:40:16 -0700 | [diff] [blame] | 445 | wait_queue_head_t signalfd_wqh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | }; |
| 447 | |
KaiGai Kohei | 0e46481 | 2006-06-25 05:49:24 -0700 | [diff] [blame] | 448 | struct pacct_struct { |
KaiGai Kohei | f6ec29a | 2006-06-25 05:49:25 -0700 | [diff] [blame] | 449 | int ac_flag; |
| 450 | long ac_exitcode; |
KaiGai Kohei | 0e46481 | 2006-06-25 05:49:24 -0700 | [diff] [blame] | 451 | unsigned long ac_mem; |
KaiGai Kohei | 77787bf | 2006-06-25 05:49:26 -0700 | [diff] [blame] | 452 | cputime_t ac_utime, ac_stime; |
| 453 | unsigned long ac_minflt, ac_majflt; |
KaiGai Kohei | 0e46481 | 2006-06-25 05:49:24 -0700 | [diff] [blame] | 454 | }; |
| 455 | |
Stanislaw Gruszka | 42c4ab4 | 2009-07-29 12:15:26 +0200 | [diff] [blame] | 456 | struct cpu_itimer { |
| 457 | cputime_t expires; |
| 458 | cputime_t incr; |
Stanislaw Gruszka | 8356b5f | 2009-07-29 12:15:27 +0200 | [diff] [blame] | 459 | u32 error; |
| 460 | u32 incr_error; |
Stanislaw Gruszka | 42c4ab4 | 2009-07-29 12:15:26 +0200 | [diff] [blame] | 461 | }; |
| 462 | |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 463 | /** |
| 464 | * struct task_cputime - collected CPU time counts |
| 465 | * @utime: time spent in user mode, in &cputime_t units |
| 466 | * @stime: time spent in kernel mode, in &cputime_t units |
| 467 | * @sum_exec_runtime: total time spent on the CPU, in nanoseconds |
Ingo Molnar | 5ce73a4 | 2008-09-14 17:11:46 +0200 | [diff] [blame] | 468 | * |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 469 | * This structure groups together three kinds of CPU time that are |
| 470 | * tracked for threads and thread groups. Most things considering |
| 471 | * CPU time want to group these counts together and treat all three |
| 472 | * of them in parallel. |
| 473 | */ |
| 474 | struct task_cputime { |
| 475 | cputime_t utime; |
| 476 | cputime_t stime; |
| 477 | unsigned long long sum_exec_runtime; |
| 478 | }; |
| 479 | /* Alternate field names when used to cache expirations. */ |
| 480 | #define prof_exp stime |
| 481 | #define virt_exp utime |
| 482 | #define sched_exp sum_exec_runtime |
| 483 | |
Peter Zijlstra | 4cd4c1b | 2009-02-05 12:24:16 +0100 | [diff] [blame] | 484 | #define INIT_CPUTIME \ |
| 485 | (struct task_cputime) { \ |
| 486 | .utime = cputime_zero, \ |
| 487 | .stime = cputime_zero, \ |
| 488 | .sum_exec_runtime = 0, \ |
| 489 | } |
| 490 | |
Peter Zijlstra | c99e6ef | 2009-07-10 14:57:56 +0200 | [diff] [blame] | 491 | /* |
| 492 | * Disable preemption until the scheduler is running. |
| 493 | * Reset by start_kernel()->sched_init()->init_idle(). |
Peter Zijlstra | d86ee48 | 2009-07-10 14:57:57 +0200 | [diff] [blame] | 494 | * |
| 495 | * We include PREEMPT_ACTIVE to avoid cond_resched() from working |
| 496 | * before the scheduler is active -- see should_resched(). |
Peter Zijlstra | c99e6ef | 2009-07-10 14:57:56 +0200 | [diff] [blame] | 497 | */ |
Peter Zijlstra | d86ee48 | 2009-07-10 14:57:57 +0200 | [diff] [blame] | 498 | #define INIT_PREEMPT_COUNT (1 + PREEMPT_ACTIVE) |
Peter Zijlstra | c99e6ef | 2009-07-10 14:57:56 +0200 | [diff] [blame] | 499 | |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 500 | /** |
Peter Zijlstra | 4cd4c1b | 2009-02-05 12:24:16 +0100 | [diff] [blame] | 501 | * struct thread_group_cputimer - thread group interval timer counts |
| 502 | * @cputime: thread group interval timers. |
| 503 | * @running: non-zero when there are timers running and |
| 504 | * @cputime receives updates. |
| 505 | * @lock: lock for fields in this struct. |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 506 | * |
| 507 | * This structure contains the version of task_cputime, above, that is |
Peter Zijlstra | 4cd4c1b | 2009-02-05 12:24:16 +0100 | [diff] [blame] | 508 | * used for thread group CPU timer calculations. |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 509 | */ |
Peter Zijlstra | 4cd4c1b | 2009-02-05 12:24:16 +0100 | [diff] [blame] | 510 | struct thread_group_cputimer { |
| 511 | struct task_cputime cputime; |
| 512 | int running; |
| 513 | spinlock_t lock; |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 514 | }; |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 515 | |
Ben Blum | 4714d1d | 2011-05-26 16:25:18 -0700 | [diff] [blame] | 516 | #include <linux/rwsem.h> |
Mike Galbraith | 5091faa | 2010-11-30 14:18:03 +0100 | [diff] [blame] | 517 | struct autogroup; |
| 518 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | /* |
Jonathan Neuschäfer | e815f0a | 2011-03-21 20:24:47 +0100 | [diff] [blame] | 520 | * NOTE! "signal_struct" does not have its own |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | * locking, because a shared signal_struct always |
| 522 | * implies a shared sighand_struct, so locking |
| 523 | * sighand_struct is always a proper superset of |
| 524 | * the locking of signal_struct. |
| 525 | */ |
| 526 | struct signal_struct { |
Oleg Nesterov | ea6d290 | 2010-05-26 14:43:16 -0700 | [diff] [blame] | 527 | atomic_t sigcnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | atomic_t live; |
Oleg Nesterov | b3ac022 | 2010-05-26 14:43:24 -0700 | [diff] [blame] | 529 | int nr_threads; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | |
| 531 | wait_queue_head_t wait_chldexit; /* for wait4() */ |
| 532 | |
| 533 | /* current thread group signal load-balancing target: */ |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 534 | struct task_struct *curr_target; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | |
| 536 | /* shared signal handling: */ |
| 537 | struct sigpending shared_pending; |
| 538 | |
| 539 | /* thread group exit support */ |
| 540 | int group_exit_code; |
| 541 | /* overloaded: |
| 542 | * - notify group_exit_task when ->count is equal to notify_count |
| 543 | * - everyone except group_exit_task is stopped during signal delivery |
| 544 | * of fatal signals, group_exit_task processes the signal. |
| 545 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | int notify_count; |
Richard Kennedy | 07dd20e | 2008-08-01 13:18:04 +0100 | [diff] [blame] | 547 | struct task_struct *group_exit_task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | |
| 549 | /* thread group stop support, overloads group_exit_code too */ |
| 550 | int group_stop_count; |
| 551 | unsigned int flags; /* see SIGNAL_* flags below */ |
| 552 | |
| 553 | /* POSIX.1b Interval Timers */ |
| 554 | struct list_head posix_timers; |
| 555 | |
| 556 | /* ITIMER_REAL timer for the process */ |
Thomas Gleixner | 2ff678b | 2006-01-09 20:52:34 -0800 | [diff] [blame] | 557 | struct hrtimer real_timer; |
Oleg Nesterov | fea9d17 | 2008-02-08 04:19:19 -0800 | [diff] [blame] | 558 | struct pid *leader_pid; |
Thomas Gleixner | 2ff678b | 2006-01-09 20:52:34 -0800 | [diff] [blame] | 559 | ktime_t it_real_incr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | |
Stanislaw Gruszka | 42c4ab4 | 2009-07-29 12:15:26 +0200 | [diff] [blame] | 561 | /* |
| 562 | * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use |
| 563 | * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these |
| 564 | * values are defined to 0 and 1 respectively |
| 565 | */ |
| 566 | struct cpu_itimer it[2]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 568 | /* |
Peter Zijlstra | 4cd4c1b | 2009-02-05 12:24:16 +0100 | [diff] [blame] | 569 | * Thread group totals for process CPU timers. |
| 570 | * See thread_group_cputimer(), et al, for details. |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 571 | */ |
Peter Zijlstra | 4cd4c1b | 2009-02-05 12:24:16 +0100 | [diff] [blame] | 572 | struct thread_group_cputimer cputimer; |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 573 | |
| 574 | /* Earliest-expiration cache. */ |
| 575 | struct task_cputime cputime_expires; |
| 576 | |
| 577 | struct list_head cpu_timers[3]; |
| 578 | |
Eric W. Biederman | ab521dc | 2007-02-12 00:53:00 -0800 | [diff] [blame] | 579 | struct pid *tty_old_pgrp; |
Cedric Le Goater | 1ec320a | 2006-12-08 02:37:55 -0800 | [diff] [blame] | 580 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | /* boolean value for session group leader */ |
| 582 | int leader; |
| 583 | |
| 584 | struct tty_struct *tty; /* NULL if no tty */ |
| 585 | |
Mike Galbraith | 5091faa | 2010-11-30 14:18:03 +0100 | [diff] [blame] | 586 | #ifdef CONFIG_SCHED_AUTOGROUP |
| 587 | struct autogroup *autogroup; |
| 588 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | /* |
| 590 | * Cumulative resource counters for dead threads in the group, |
| 591 | * and for reaped dead child processes forked by this group. |
| 592 | * Live threads maintain their own counters and add to these |
| 593 | * in __exit_signal, except for the group leader. |
| 594 | */ |
Peter Zijlstra | 32bd671 | 2009-02-05 12:24:15 +0100 | [diff] [blame] | 595 | cputime_t utime, stime, cutime, cstime; |
Laurent Vivier | 9ac5231 | 2007-10-15 17:00:19 +0200 | [diff] [blame] | 596 | cputime_t gtime; |
| 597 | cputime_t cgtime; |
Hidetoshi Seto | 0cf55e1 | 2009-12-02 17:28:07 +0900 | [diff] [blame] | 598 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING |
| 599 | cputime_t prev_utime, prev_stime; |
| 600 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; |
| 602 | unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; |
Eric Dumazet | 6eaeeab | 2007-05-10 22:22:37 -0700 | [diff] [blame] | 603 | unsigned long inblock, oublock, cinblock, coublock; |
Jiri Pirko | 1f10206 | 2009-09-22 16:44:10 -0700 | [diff] [blame] | 604 | unsigned long maxrss, cmaxrss; |
Andrea Righi | 940389b | 2008-07-28 00:48:12 +0200 | [diff] [blame] | 605 | struct task_io_accounting ioac; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | |
| 607 | /* |
Peter Zijlstra | 32bd671 | 2009-02-05 12:24:15 +0100 | [diff] [blame] | 608 | * Cumulative ns of schedule CPU time fo dead threads in the |
| 609 | * group, not including a zombie group leader, (This only differs |
| 610 | * from jiffies_to_ns(utime + stime) if sched_clock uses something |
| 611 | * other than jiffies.) |
| 612 | */ |
| 613 | unsigned long long sum_sched_runtime; |
| 614 | |
| 615 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | * We don't bother to synchronize most readers of this at all, |
| 617 | * because there is no reader checking a limit that actually needs |
| 618 | * to get both rlim_cur and rlim_max atomically, and either one |
| 619 | * alone is a single word that can safely be read normally. |
| 620 | * getrlimit/setrlimit use task_lock(current->group_leader) to |
| 621 | * protect this instead of the siglock, because they really |
| 622 | * have no need to disable irqs. |
| 623 | */ |
| 624 | struct rlimit rlim[RLIM_NLIMITS]; |
| 625 | |
KaiGai Kohei | 0e46481 | 2006-06-25 05:49:24 -0700 | [diff] [blame] | 626 | #ifdef CONFIG_BSD_PROCESS_ACCT |
| 627 | struct pacct_struct pacct; /* per-process accounting information */ |
| 628 | #endif |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 629 | #ifdef CONFIG_TASKSTATS |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 630 | struct taskstats *stats; |
| 631 | #endif |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 632 | #ifdef CONFIG_AUDIT |
| 633 | unsigned audit_tty; |
| 634 | struct tty_audit_buf *tty_audit_buf; |
| 635 | #endif |
Ben Blum | 4714d1d | 2011-05-26 16:25:18 -0700 | [diff] [blame] | 636 | #ifdef CONFIG_CGROUPS |
| 637 | /* |
| 638 | * The threadgroup_fork_lock prevents threads from forking with |
| 639 | * CLONE_THREAD while held for writing. Use this for fork-sensitive |
| 640 | * threadgroup-wide operations. It's taken for reading in fork.c in |
| 641 | * copy_process(). |
| 642 | * Currently only needed write-side by cgroups. |
| 643 | */ |
| 644 | struct rw_semaphore threadgroup_fork_lock; |
| 645 | #endif |
KOSAKI Motohiro | 28b83c5 | 2009-09-21 17:03:13 -0700 | [diff] [blame] | 646 | |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 647 | int oom_adj; /* OOM kill score adjustment (bit shift) */ |
| 648 | int oom_score_adj; /* OOM kill score adjustment */ |
Mandeep Singh Baines | dabb16f | 2011-01-13 15:46:05 -0800 | [diff] [blame] | 649 | int oom_score_adj_min; /* OOM kill score adjustment minimum value. |
| 650 | * Only settable by CAP_SYS_RESOURCE. */ |
KOSAKI Motohiro | 9b1bf12 | 2010-10-27 15:34:08 -0700 | [diff] [blame] | 651 | |
| 652 | struct mutex cred_guard_mutex; /* guard against foreign influences on |
| 653 | * credential calculations |
| 654 | * (notably. ptrace) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | }; |
| 656 | |
Nick Piggin | 4866cde | 2005-06-25 14:57:23 -0700 | [diff] [blame] | 657 | /* Context switch must be unlocked if interrupts are to be enabled */ |
| 658 | #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW |
| 659 | # define __ARCH_WANT_UNLOCKED_CTXSW |
| 660 | #endif |
| 661 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | /* |
| 663 | * Bits in flags field of signal_struct. |
| 664 | */ |
| 665 | #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ |
Oleg Nesterov | ee77f07 | 2011-04-01 20:12:38 +0200 | [diff] [blame] | 666 | #define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */ |
| 667 | #define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */ |
Oleg Nesterov | e442055 | 2008-04-30 00:52:44 -0700 | [diff] [blame] | 668 | /* |
| 669 | * Pending notifications to parent. |
| 670 | */ |
| 671 | #define SIGNAL_CLD_STOPPED 0x00000010 |
| 672 | #define SIGNAL_CLD_CONTINUED 0x00000020 |
| 673 | #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | |
Oleg Nesterov | fae5fa4 | 2008-04-30 00:53:03 -0700 | [diff] [blame] | 675 | #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */ |
| 676 | |
Oleg Nesterov | ed5d2ca | 2008-02-04 22:27:24 -0800 | [diff] [blame] | 677 | /* If true, all threads except ->group_exit_task have pending SIGKILL */ |
| 678 | static inline int signal_group_exit(const struct signal_struct *sig) |
| 679 | { |
| 680 | return (sig->flags & SIGNAL_GROUP_EXIT) || |
| 681 | (sig->group_exit_task != NULL); |
| 682 | } |
| 683 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | /* |
| 685 | * Some day this will be a full-fledged user tracking system.. |
| 686 | */ |
| 687 | struct user_struct { |
| 688 | atomic_t __count; /* reference count */ |
| 689 | atomic_t processes; /* How many processes does this user have? */ |
| 690 | atomic_t files; /* How many open files does this user have? */ |
| 691 | atomic_t sigpending; /* How many pending signals does this user have? */ |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 692 | #ifdef CONFIG_INOTIFY_USER |
Robert Love | 0eeca28 | 2005-07-12 17:06:03 -0400 | [diff] [blame] | 693 | atomic_t inotify_watches; /* How many inotify watches does this user have? */ |
| 694 | atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ |
| 695 | #endif |
Eric Paris | 4afeff8 | 2010-10-28 17:21:58 -0400 | [diff] [blame] | 696 | #ifdef CONFIG_FANOTIFY |
| 697 | atomic_t fanotify_listeners; |
| 698 | #endif |
Davide Libenzi | 7ef9964 | 2008-12-01 13:13:55 -0800 | [diff] [blame] | 699 | #ifdef CONFIG_EPOLL |
Robin Holt | 52bd19f7 | 2011-01-12 17:00:01 -0800 | [diff] [blame] | 700 | atomic_long_t epoll_watches; /* The number of file descriptors currently watched */ |
Davide Libenzi | 7ef9964 | 2008-12-01 13:13:55 -0800 | [diff] [blame] | 701 | #endif |
Alexey Dobriyan | 970a864 | 2007-10-16 23:30:09 -0700 | [diff] [blame] | 702 | #ifdef CONFIG_POSIX_MQUEUE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | /* protected by mq_lock */ |
| 704 | unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ |
Alexey Dobriyan | 970a864 | 2007-10-16 23:30:09 -0700 | [diff] [blame] | 705 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | unsigned long locked_shm; /* How many pages of mlocked shm ? */ |
| 707 | |
| 708 | #ifdef CONFIG_KEYS |
| 709 | struct key *uid_keyring; /* UID specific keyring */ |
| 710 | struct key *session_keyring; /* UID's default session keyring */ |
| 711 | #endif |
| 712 | |
| 713 | /* Hash table maintenance information */ |
Pavel Emelyanov | 735de22 | 2007-09-18 22:46:44 -0700 | [diff] [blame] | 714 | struct hlist_node uidhash_node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | uid_t uid; |
Serge Hallyn | 18b6e04 | 2008-10-15 16:38:45 -0500 | [diff] [blame] | 716 | struct user_namespace *user_ns; |
Srivatsa Vaddagiri | 24e377a | 2007-10-15 17:00:09 +0200 | [diff] [blame] | 717 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 718 | #ifdef CONFIG_PERF_EVENTS |
Peter Zijlstra | 789f90f | 2009-05-15 15:19:27 +0200 | [diff] [blame] | 719 | atomic_long_t locked_vm; |
| 720 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | }; |
| 722 | |
Kay Sievers | eb41d94 | 2007-11-02 13:47:53 +0100 | [diff] [blame] | 723 | extern int uids_sysfs_init(void); |
Dhaval Giani | 5cb350b | 2007-10-15 17:00:14 +0200 | [diff] [blame] | 724 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | extern struct user_struct *find_user(uid_t); |
| 726 | |
| 727 | extern struct user_struct root_user; |
| 728 | #define INIT_USER (&root_user) |
| 729 | |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 730 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | struct backing_dev_info; |
| 732 | struct reclaim_state; |
| 733 | |
Chandra Seetharaman | 52f17b6 | 2006-07-14 00:24:38 -0700 | [diff] [blame] | 734 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | struct sched_info { |
| 736 | /* cumulative counters */ |
Ingo Molnar | 2d72376 | 2007-10-15 17:00:12 +0200 | [diff] [blame] | 737 | unsigned long pcount; /* # of times run on this cpu */ |
Ken Chen | 9c2c480 | 2008-12-16 23:41:22 -0800 | [diff] [blame] | 738 | unsigned long long run_delay; /* time spent waiting on a runqueue */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | |
| 740 | /* timestamps */ |
Balbir Singh | 172ba84 | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 741 | unsigned long long last_arrival,/* when we last ran on a cpu */ |
| 742 | last_queued; /* when we were last queued to run */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | }; |
Chandra Seetharaman | 52f17b6 | 2006-07-14 00:24:38 -0700 | [diff] [blame] | 744 | #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 746 | #ifdef CONFIG_TASK_DELAY_ACCT |
| 747 | struct task_delay_info { |
| 748 | spinlock_t lock; |
| 749 | unsigned int flags; /* Private per-task flags */ |
| 750 | |
| 751 | /* For each stat XXX, add following, aligned appropriately |
| 752 | * |
| 753 | * struct timespec XXX_start, XXX_end; |
| 754 | * u64 XXX_delay; |
| 755 | * u32 XXX_count; |
| 756 | * |
| 757 | * Atomicity of updates to XXX_delay, XXX_count protected by |
| 758 | * single lock above (split into XXX_lock if contention is an issue). |
| 759 | */ |
Shailabh Nagar | 0ff9224 | 2006-07-14 00:24:37 -0700 | [diff] [blame] | 760 | |
| 761 | /* |
| 762 | * XXX_count is incremented on every XXX operation, the delay |
| 763 | * associated with the operation is added to XXX_delay. |
| 764 | * XXX_delay contains the accumulated delay time in nanoseconds. |
| 765 | */ |
| 766 | struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */ |
| 767 | u64 blkio_delay; /* wait for sync block io completion */ |
| 768 | u64 swapin_delay; /* wait for swapin block io completion */ |
| 769 | u32 blkio_count; /* total count of the number of sync block */ |
| 770 | /* io operations performed */ |
| 771 | u32 swapin_count; /* total count of the number of swapin block */ |
| 772 | /* io operations performed */ |
Keika Kobayashi | 873b477 | 2008-07-25 01:48:52 -0700 | [diff] [blame] | 773 | |
| 774 | struct timespec freepages_start, freepages_end; |
| 775 | u64 freepages_delay; /* wait for memory reclaim */ |
| 776 | u32 freepages_count; /* total count of memory reclaim */ |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 777 | }; |
Chandra Seetharaman | 52f17b6 | 2006-07-14 00:24:38 -0700 | [diff] [blame] | 778 | #endif /* CONFIG_TASK_DELAY_ACCT */ |
| 779 | |
| 780 | static inline int sched_info_on(void) |
| 781 | { |
| 782 | #ifdef CONFIG_SCHEDSTATS |
| 783 | return 1; |
| 784 | #elif defined(CONFIG_TASK_DELAY_ACCT) |
| 785 | extern int delayacct_on; |
| 786 | return delayacct_on; |
| 787 | #else |
| 788 | return 0; |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 789 | #endif |
Chandra Seetharaman | 52f17b6 | 2006-07-14 00:24:38 -0700 | [diff] [blame] | 790 | } |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 791 | |
Ingo Molnar | d15bcfd | 2007-07-09 18:51:57 +0200 | [diff] [blame] | 792 | enum cpu_idle_type { |
| 793 | CPU_IDLE, |
| 794 | CPU_NOT_IDLE, |
| 795 | CPU_NEWLY_IDLE, |
| 796 | CPU_MAX_IDLE_TYPES |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | }; |
| 798 | |
| 799 | /* |
Nikhil Rao | c8b2811 | 2011-05-18 14:37:48 -0700 | [diff] [blame] | 800 | * Increase resolution of nice-level calculations for 64-bit architectures. |
| 801 | * The extra resolution improves shares distribution and load balancing of |
| 802 | * low-weight task groups (eg. nice +19 on an autogroup), deeper taskgroup |
| 803 | * hierarchies, especially on larger systems. This is not a user-visible change |
| 804 | * and does not change the user-interface for setting shares/weights. |
| 805 | * |
| 806 | * We increase resolution only if we have enough bits to allow this increased |
| 807 | * resolution (i.e. BITS_PER_LONG > 32). The costs for increasing resolution |
| 808 | * when BITS_PER_LONG <= 32 are pretty high and the returns do not justify the |
| 809 | * increased costs. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | */ |
Peter Zijlstra | e4c2fb0 | 2011-07-05 10:56:32 +0200 | [diff] [blame] | 811 | #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] | 812 | # define SCHED_LOAD_RESOLUTION 10 |
| 813 | # define scale_load(w) ((w) << SCHED_LOAD_RESOLUTION) |
| 814 | # define scale_load_down(w) ((w) >> SCHED_LOAD_RESOLUTION) |
| 815 | #else |
| 816 | # define SCHED_LOAD_RESOLUTION 0 |
| 817 | # define scale_load(w) (w) |
| 818 | # define scale_load_down(w) (w) |
| 819 | #endif |
Ingo Molnar | 9aa7b36 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 820 | |
Nikhil Rao | c8b2811 | 2011-05-18 14:37:48 -0700 | [diff] [blame] | 821 | #define SCHED_LOAD_SHIFT (10 + SCHED_LOAD_RESOLUTION) |
Ingo Molnar | 9aa7b36 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 822 | #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT) |
| 823 | |
Nikhil Rao | 1399fa7 | 2011-05-18 10:09:39 -0700 | [diff] [blame] | 824 | /* |
| 825 | * Increase resolution of cpu_power calculations |
| 826 | */ |
| 827 | #define SCHED_POWER_SHIFT 10 |
| 828 | #define SCHED_POWER_SCALE (1L << SCHED_POWER_SHIFT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | |
Nikhil Rao | 1399fa7 | 2011-05-18 10:09:39 -0700 | [diff] [blame] | 830 | /* |
| 831 | * sched-domains (multiprocessor balancing) declarations: |
| 832 | */ |
Peter Williams | 2dd73a4 | 2006-06-27 02:54:34 -0700 | [diff] [blame] | 833 | #ifdef CONFIG_SMP |
Peter Zijlstra | b5d978e | 2009-09-01 10:34:33 +0200 | [diff] [blame] | 834 | #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */ |
| 835 | #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */ |
| 836 | #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */ |
| 837 | #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */ |
Peter Zijlstra | c88d591 | 2009-09-10 13:50:02 +0200 | [diff] [blame] | 838 | #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */ |
Peter Zijlstra | b5d978e | 2009-09-01 10:34:33 +0200 | [diff] [blame] | 839 | #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */ |
Peter Zijlstra | 59abf02 | 2009-09-16 08:28:30 +0200 | [diff] [blame] | 840 | #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] | 841 | #define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */ |
| 842 | #define SD_POWERSAVINGS_BALANCE 0x0100 /* Balance for power savings */ |
| 843 | #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */ |
| 844 | #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */ |
Michael Neuling | 532cb4c | 2010-06-08 14:57:02 +1000 | [diff] [blame] | 845 | #define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */ |
Peter Zijlstra | b5d978e | 2009-09-01 10:34:33 +0200 | [diff] [blame] | 846 | #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] | 847 | #define SD_OVERLAP 0x2000 /* sched_domains of this level overlap */ |
Siddha, Suresh B | 5c45bf2 | 2006-06-27 02:54:42 -0700 | [diff] [blame] | 848 | |
Gautham R Shenoy | afb8a9b | 2008-12-18 23:26:09 +0530 | [diff] [blame] | 849 | enum powersavings_balance_level { |
| 850 | POWERSAVINGS_BALANCE_NONE = 0, /* No power saving load balance */ |
| 851 | POWERSAVINGS_BALANCE_BASIC, /* Fill one thread/core/package |
| 852 | * first for long running threads |
| 853 | */ |
| 854 | POWERSAVINGS_BALANCE_WAKEUP, /* Also bias task wakeups to semi-idle |
| 855 | * cpu package for power savings |
| 856 | */ |
| 857 | MAX_POWERSAVINGS_BALANCE_LEVELS |
| 858 | }; |
Siddha, Suresh B | 89c4710 | 2006-10-03 01:14:09 -0700 | [diff] [blame] | 859 | |
Vaidyanathan Srinivasan | 716707b | 2008-12-18 23:26:02 +0530 | [diff] [blame] | 860 | extern int sched_mc_power_savings, sched_smt_power_savings; |
Siddha, Suresh B | 89c4710 | 2006-10-03 01:14:09 -0700 | [diff] [blame] | 861 | |
Vaidyanathan Srinivasan | 716707b | 2008-12-18 23:26:02 +0530 | [diff] [blame] | 862 | static inline int sd_balance_for_mc_power(void) |
| 863 | { |
| 864 | if (sched_smt_power_savings) |
| 865 | return SD_POWERSAVINGS_BALANCE; |
Siddha, Suresh B | 5c45bf2 | 2006-06-27 02:54:42 -0700 | [diff] [blame] | 866 | |
Vaidyanathan Srinivasan | 28f5318 | 2010-02-08 15:35:55 +0530 | [diff] [blame] | 867 | if (!sched_mc_power_savings) |
| 868 | return SD_PREFER_SIBLING; |
| 869 | |
| 870 | return 0; |
Vaidyanathan Srinivasan | 716707b | 2008-12-18 23:26:02 +0530 | [diff] [blame] | 871 | } |
| 872 | |
| 873 | static inline int sd_balance_for_package_power(void) |
| 874 | { |
| 875 | if (sched_mc_power_savings | sched_smt_power_savings) |
| 876 | return SD_POWERSAVINGS_BALANCE; |
| 877 | |
Peter Zijlstra | b5d978e | 2009-09-01 10:34:33 +0200 | [diff] [blame] | 878 | return SD_PREFER_SIBLING; |
Vaidyanathan Srinivasan | 716707b | 2008-12-18 23:26:02 +0530 | [diff] [blame] | 879 | } |
Nick Piggin | 147cbb4 | 2005-06-25 14:57:19 -0700 | [diff] [blame] | 880 | |
Michael Neuling | 532cb4c | 2010-06-08 14:57:02 +1000 | [diff] [blame] | 881 | extern int __weak arch_sd_sibiling_asym_packing(void); |
| 882 | |
Vaidyanathan Srinivasan | 100fdae | 2008-12-18 23:26:47 +0530 | [diff] [blame] | 883 | /* |
| 884 | * Optimise SD flags for power savings: |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 885 | * SD_BALANCE_NEWIDLE helps aggressive task consolidation and power savings. |
Vaidyanathan Srinivasan | 100fdae | 2008-12-18 23:26:47 +0530 | [diff] [blame] | 886 | * Keep default SD flags if sched_{smt,mc}_power_saving=0 |
| 887 | */ |
| 888 | |
| 889 | static inline int sd_power_saving_flags(void) |
| 890 | { |
| 891 | if (sched_mc_power_savings | sched_smt_power_savings) |
| 892 | return SD_BALANCE_NEWIDLE; |
| 893 | |
| 894 | return 0; |
| 895 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | |
Peter Zijlstra | 9c3f75c | 2011-07-14 13:00:06 +0200 | [diff] [blame] | 897 | struct sched_group_power { |
Peter Zijlstra | e3589f6 | 2011-07-15 10:35:52 +0200 | [diff] [blame] | 898 | atomic_t ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | /* |
| 900 | * 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] | 901 | * single CPU. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | */ |
Peter Zijlstra | 9c3f75c | 2011-07-14 13:00:06 +0200 | [diff] [blame] | 903 | unsigned int power, power_orig; |
| 904 | }; |
| 905 | |
| 906 | struct sched_group { |
| 907 | struct sched_group *next; /* Must be a circular list */ |
| 908 | atomic_t ref; |
| 909 | |
Suresh Siddha | aae6d3d | 2010-09-17 15:02:32 -0700 | [diff] [blame] | 910 | unsigned int group_weight; |
Peter Zijlstra | 9c3f75c | 2011-07-14 13:00:06 +0200 | [diff] [blame] | 911 | struct sched_group_power *sgp; |
Rusty Russell | 6c99e9a | 2008-11-25 02:35:04 +1030 | [diff] [blame] | 912 | |
Ingo Molnar | 4200efd | 2009-05-19 09:22:19 +0200 | [diff] [blame] | 913 | /* |
| 914 | * The CPUs this group covers. |
| 915 | * |
| 916 | * NOTE: this field is variable length. (Allocated dynamically |
| 917 | * by attaching extra space to the end of the structure, |
| 918 | * depending on how many CPUs the kernel has booted up with) |
Ingo Molnar | 4200efd | 2009-05-19 09:22:19 +0200 | [diff] [blame] | 919 | */ |
| 920 | unsigned long cpumask[0]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | }; |
| 922 | |
Rusty Russell | 758b2cd | 2008-11-25 02:35:04 +1030 | [diff] [blame] | 923 | static inline struct cpumask *sched_group_cpus(struct sched_group *sg) |
| 924 | { |
Rusty Russell | 6c99e9a | 2008-11-25 02:35:04 +1030 | [diff] [blame] | 925 | return to_cpumask(sg->cpumask); |
Rusty Russell | 758b2cd | 2008-11-25 02:35:04 +1030 | [diff] [blame] | 926 | } |
| 927 | |
Hidetoshi Seto | 1d3504f | 2008-04-15 14:04:23 +0900 | [diff] [blame] | 928 | struct sched_domain_attr { |
| 929 | int relax_domain_level; |
| 930 | }; |
| 931 | |
| 932 | #define SD_ATTR_INIT (struct sched_domain_attr) { \ |
| 933 | .relax_domain_level = -1, \ |
| 934 | } |
| 935 | |
Peter Zijlstra | 60495e7 | 2011-04-07 14:10:04 +0200 | [diff] [blame] | 936 | extern int sched_domain_level_max; |
| 937 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | struct sched_domain { |
| 939 | /* These fields must be setup */ |
| 940 | struct sched_domain *parent; /* top domain must be null terminated */ |
Siddha, Suresh B | 1a84887 | 2006-10-03 01:14:08 -0700 | [diff] [blame] | 941 | struct sched_domain *child; /* bottom domain must be null terminated */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | struct sched_group *groups; /* the balancing groups of the domain */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | unsigned long min_interval; /* Minimum balance interval ms */ |
| 944 | unsigned long max_interval; /* Maximum balance interval ms */ |
| 945 | unsigned int busy_factor; /* less balancing by factor if busy */ |
| 946 | unsigned int imbalance_pct; /* No balance until over watermark */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ |
Nick Piggin | 7897986 | 2005-06-25 14:57:13 -0700 | [diff] [blame] | 948 | unsigned int busy_idx; |
| 949 | unsigned int idle_idx; |
| 950 | unsigned int newidle_idx; |
| 951 | unsigned int wake_idx; |
Nick Piggin | 147cbb4 | 2005-06-25 14:57:19 -0700 | [diff] [blame] | 952 | unsigned int forkexec_idx; |
Peter Zijlstra | a52bfd73 | 2009-09-01 10:34:35 +0200 | [diff] [blame] | 953 | unsigned int smt_gain; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | int flags; /* See SD_* */ |
Peter Zijlstra | 60495e7 | 2011-04-07 14:10:04 +0200 | [diff] [blame] | 955 | int level; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | |
| 957 | /* Runtime fields. */ |
| 958 | unsigned long last_balance; /* init to jiffies. units in jiffies */ |
| 959 | unsigned int balance_interval; /* initialise to 1. units in ms. */ |
| 960 | unsigned int nr_balance_failed; /* initialise to 0 */ |
| 961 | |
Peter Zijlstra | 2398f2c | 2008-06-27 13:41:35 +0200 | [diff] [blame] | 962 | u64 last_update; |
| 963 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 964 | #ifdef CONFIG_SCHEDSTATS |
| 965 | /* load_balance() stats */ |
Ken Chen | 480b943 | 2007-10-18 21:32:56 +0200 | [diff] [blame] | 966 | unsigned int lb_count[CPU_MAX_IDLE_TYPES]; |
| 967 | unsigned int lb_failed[CPU_MAX_IDLE_TYPES]; |
| 968 | unsigned int lb_balanced[CPU_MAX_IDLE_TYPES]; |
| 969 | unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES]; |
| 970 | unsigned int lb_gained[CPU_MAX_IDLE_TYPES]; |
| 971 | unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; |
| 972 | unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; |
| 973 | unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | |
| 975 | /* Active load balancing */ |
Ken Chen | 480b943 | 2007-10-18 21:32:56 +0200 | [diff] [blame] | 976 | unsigned int alb_count; |
| 977 | unsigned int alb_failed; |
| 978 | unsigned int alb_pushed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | |
Nick Piggin | 68767a0 | 2005-06-25 14:57:20 -0700 | [diff] [blame] | 980 | /* SD_BALANCE_EXEC stats */ |
Ken Chen | 480b943 | 2007-10-18 21:32:56 +0200 | [diff] [blame] | 981 | unsigned int sbe_count; |
| 982 | unsigned int sbe_balanced; |
| 983 | unsigned int sbe_pushed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | |
Nick Piggin | 68767a0 | 2005-06-25 14:57:20 -0700 | [diff] [blame] | 985 | /* SD_BALANCE_FORK stats */ |
Ken Chen | 480b943 | 2007-10-18 21:32:56 +0200 | [diff] [blame] | 986 | unsigned int sbf_count; |
| 987 | unsigned int sbf_balanced; |
| 988 | unsigned int sbf_pushed; |
Nick Piggin | 68767a0 | 2005-06-25 14:57:20 -0700 | [diff] [blame] | 989 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | /* try_to_wake_up() stats */ |
Ken Chen | 480b943 | 2007-10-18 21:32:56 +0200 | [diff] [blame] | 991 | unsigned int ttwu_wake_remote; |
| 992 | unsigned int ttwu_move_affine; |
| 993 | unsigned int ttwu_move_balance; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | #endif |
Ingo Molnar | a5d8c34 | 2008-10-09 11:35:51 +0200 | [diff] [blame] | 995 | #ifdef CONFIG_SCHED_DEBUG |
| 996 | char *name; |
| 997 | #endif |
Peter Zijlstra | dce840a | 2011-04-07 14:09:50 +0200 | [diff] [blame] | 998 | union { |
| 999 | void *private; /* used during construction */ |
| 1000 | struct rcu_head rcu; /* used during destruction */ |
| 1001 | }; |
Rusty Russell | 6c99e9a | 2008-11-25 02:35:04 +1030 | [diff] [blame] | 1002 | |
Peter Zijlstra | 669c55e | 2010-04-16 14:59:29 +0200 | [diff] [blame] | 1003 | unsigned int span_weight; |
Ingo Molnar | 4200efd | 2009-05-19 09:22:19 +0200 | [diff] [blame] | 1004 | /* |
| 1005 | * Span of all CPUs in this domain. |
| 1006 | * |
| 1007 | * NOTE: this field is variable length. (Allocated dynamically |
| 1008 | * by attaching extra space to the end of the structure, |
| 1009 | * depending on how many CPUs the kernel has booted up with) |
Ingo Molnar | 4200efd | 2009-05-19 09:22:19 +0200 | [diff] [blame] | 1010 | */ |
| 1011 | unsigned long span[0]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1012 | }; |
| 1013 | |
Rusty Russell | 758b2cd | 2008-11-25 02:35:04 +1030 | [diff] [blame] | 1014 | static inline struct cpumask *sched_domain_span(struct sched_domain *sd) |
| 1015 | { |
Rusty Russell | 6c99e9a | 2008-11-25 02:35:04 +1030 | [diff] [blame] | 1016 | return to_cpumask(sd->span); |
Rusty Russell | 758b2cd | 2008-11-25 02:35:04 +1030 | [diff] [blame] | 1017 | } |
| 1018 | |
Rusty Russell | acc3f5d | 2009-11-03 14:53:40 +1030 | [diff] [blame] | 1019 | 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] | 1020 | struct sched_domain_attr *dattr_new); |
Paul Jackson | 029190c | 2007-10-18 23:40:20 -0700 | [diff] [blame] | 1021 | |
Rusty Russell | acc3f5d | 2009-11-03 14:53:40 +1030 | [diff] [blame] | 1022 | /* Allocate an array of sched domains, for partition_sched_domains(). */ |
| 1023 | cpumask_var_t *alloc_sched_domains(unsigned int ndoms); |
| 1024 | void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms); |
| 1025 | |
Ingo Molnar | 06aaf76 | 2008-12-18 21:30:23 +0100 | [diff] [blame] | 1026 | /* Test a flag in parent sched domain */ |
| 1027 | static inline int test_sd_parent(struct sched_domain *sd, int flag) |
| 1028 | { |
| 1029 | if (sd->parent && (sd->parent->flags & flag)) |
| 1030 | return 1; |
| 1031 | |
| 1032 | return 0; |
| 1033 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1034 | |
Peter Zijlstra | 47fe38f | 2009-09-02 13:49:18 +0200 | [diff] [blame] | 1035 | unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu); |
| 1036 | unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu); |
| 1037 | |
Ingo Molnar | 1b427c1 | 2008-07-18 14:01:39 +0200 | [diff] [blame] | 1038 | #else /* CONFIG_SMP */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1039 | |
Ingo Molnar | 1b427c1 | 2008-07-18 14:01:39 +0200 | [diff] [blame] | 1040 | struct sched_domain_attr; |
| 1041 | |
| 1042 | static inline void |
Rusty Russell | acc3f5d | 2009-11-03 14:53:40 +1030 | [diff] [blame] | 1043 | partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], |
Ingo Molnar | 1b427c1 | 2008-07-18 14:01:39 +0200 | [diff] [blame] | 1044 | struct sched_domain_attr *dattr_new) |
Con Kolivas | d02c7a8 | 2007-07-26 13:40:43 +0200 | [diff] [blame] | 1045 | { |
Con Kolivas | d02c7a8 | 2007-07-26 13:40:43 +0200 | [diff] [blame] | 1046 | } |
Ingo Molnar | 1b427c1 | 2008-07-18 14:01:39 +0200 | [diff] [blame] | 1047 | #endif /* !CONFIG_SMP */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | |
Peter Zijlstra | 47fe38f | 2009-09-02 13:49:18 +0200 | [diff] [blame] | 1049 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1050 | struct io_context; /* See blkdev.h */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1051 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | |
Chen, Kenneth W | 383f283 | 2005-09-09 13:02:02 -0700 | [diff] [blame] | 1053 | #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 1054 | extern void prefetch_stack(struct task_struct *t); |
Chen, Kenneth W | 383f283 | 2005-09-09 13:02:02 -0700 | [diff] [blame] | 1055 | #else |
| 1056 | static inline void prefetch_stack(struct task_struct *t) { } |
| 1057 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | |
| 1059 | struct audit_context; /* See audit.c */ |
| 1060 | struct mempolicy; |
Jens Axboe | b92ce55 | 2006-04-11 13:52:07 +0200 | [diff] [blame] | 1061 | struct pipe_inode_info; |
Serge E. Hallyn | 4865ecf | 2006-10-02 02:18:14 -0700 | [diff] [blame] | 1062 | struct uts_namespace; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1063 | |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 1064 | struct rq; |
| 1065 | struct sched_domain; |
| 1066 | |
Peter Zijlstra | 7d47872 | 2009-09-14 19:55:44 +0200 | [diff] [blame] | 1067 | /* |
| 1068 | * wake flags |
| 1069 | */ |
| 1070 | #define WF_SYNC 0x01 /* waker goes to sleep after wakup */ |
Peter Zijlstra | a7558e0 | 2009-09-14 20:02:34 +0200 | [diff] [blame] | 1071 | #define WF_FORK 0x02 /* child wakeup after fork */ |
Peter Zijlstra | f339b9d | 2011-05-31 10:49:20 +0200 | [diff] [blame] | 1072 | #define WF_MIGRATED 0x04 /* internal use, task got migrated */ |
Peter Zijlstra | 7d47872 | 2009-09-14 19:55:44 +0200 | [diff] [blame] | 1073 | |
Peter Zijlstra | 371fd7e | 2010-03-24 16:38:48 +0100 | [diff] [blame] | 1074 | #define ENQUEUE_WAKEUP 1 |
Peter Zijlstra | 74f8e4b | 2011-04-05 17:23:47 +0200 | [diff] [blame] | 1075 | #define ENQUEUE_HEAD 2 |
| 1076 | #ifdef CONFIG_SMP |
| 1077 | #define ENQUEUE_WAKING 4 /* sched_class::task_waking was called */ |
| 1078 | #else |
| 1079 | #define ENQUEUE_WAKING 0 |
| 1080 | #endif |
Peter Zijlstra | 371fd7e | 2010-03-24 16:38:48 +0100 | [diff] [blame] | 1081 | |
| 1082 | #define DEQUEUE_SLEEP 1 |
| 1083 | |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 1084 | struct sched_class { |
Ingo Molnar | 5522d5d | 2007-10-15 17:00:12 +0200 | [diff] [blame] | 1085 | const struct sched_class *next; |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 1086 | |
Peter Zijlstra | 371fd7e | 2010-03-24 16:38:48 +0100 | [diff] [blame] | 1087 | void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags); |
| 1088 | void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags); |
Dmitry Adamushko | 4530d7a | 2007-10-15 17:00:08 +0200 | [diff] [blame] | 1089 | void (*yield_task) (struct rq *rq); |
Mike Galbraith | d95f412 | 2011-02-01 09:50:51 -0500 | [diff] [blame] | 1090 | 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] | 1091 | |
Peter Zijlstra | 7d47872 | 2009-09-14 19:55:44 +0200 | [diff] [blame] | 1092 | 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] | 1093 | |
Ingo Molnar | fb8d472 | 2007-08-09 11:16:48 +0200 | [diff] [blame] | 1094 | struct task_struct * (*pick_next_task) (struct rq *rq); |
Ingo Molnar | 31ee529 | 2007-08-09 11:16:49 +0200 | [diff] [blame] | 1095 | void (*put_prev_task) (struct rq *rq, struct task_struct *p); |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 1096 | |
Peter Williams | 681f3e6 | 2007-10-24 18:23:51 +0200 | [diff] [blame] | 1097 | #ifdef CONFIG_SMP |
Peter Zijlstra | 7608dec | 2011-04-05 17:23:46 +0200 | [diff] [blame] | 1098 | 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] | 1099 | |
Steven Rostedt | 9a897c5 | 2008-01-25 21:08:22 +0100 | [diff] [blame] | 1100 | void (*pre_schedule) (struct rq *this_rq, struct task_struct *task); |
| 1101 | void (*post_schedule) (struct rq *this_rq); |
Peter Zijlstra | 74f8e4b | 2011-04-05 17:23:47 +0200 | [diff] [blame] | 1102 | void (*task_waking) (struct task_struct *task); |
Peter Zijlstra | efbbd05 | 2009-12-16 18:04:40 +0100 | [diff] [blame] | 1103 | void (*task_woken) (struct rq *this_rq, struct task_struct *task); |
Peter Williams | e1d1484 | 2007-10-24 18:23:51 +0200 | [diff] [blame] | 1104 | |
Mike Travis | cd8ba7c | 2008-03-26 14:23:49 -0700 | [diff] [blame] | 1105 | void (*set_cpus_allowed)(struct task_struct *p, |
Rusty Russell | 96f874e | 2008-11-25 02:35:14 +1030 | [diff] [blame] | 1106 | const struct cpumask *newmask); |
Gregory Haskins | 57d885f | 2008-01-25 21:08:18 +0100 | [diff] [blame] | 1107 | |
Gregory Haskins | 1f11eb6 | 2008-06-04 15:04:05 -0400 | [diff] [blame] | 1108 | void (*rq_online)(struct rq *rq); |
| 1109 | void (*rq_offline)(struct rq *rq); |
Li Zefan | 4ce72a2 | 2008-10-22 15:25:26 +0800 | [diff] [blame] | 1110 | #endif |
| 1111 | |
| 1112 | void (*set_curr_task) (struct rq *rq); |
| 1113 | void (*task_tick) (struct rq *rq, struct task_struct *p, int queued); |
Peter Zijlstra | cd29fe6 | 2009-11-27 17:32:46 +0100 | [diff] [blame] | 1114 | void (*task_fork) (struct task_struct *p); |
Steven Rostedt | cb46984 | 2008-01-25 21:08:22 +0100 | [diff] [blame] | 1115 | |
Peter Zijlstra | da7a735 | 2011-01-17 17:03:27 +0100 | [diff] [blame] | 1116 | void (*switched_from) (struct rq *this_rq, struct task_struct *task); |
| 1117 | void (*switched_to) (struct rq *this_rq, struct task_struct *task); |
Steven Rostedt | cb46984 | 2008-01-25 21:08:22 +0100 | [diff] [blame] | 1118 | void (*prio_changed) (struct rq *this_rq, struct task_struct *task, |
Peter Zijlstra | da7a735 | 2011-01-17 17:03:27 +0100 | [diff] [blame] | 1119 | int oldprio); |
Peter Zijlstra | 810b381 | 2008-02-29 15:21:01 -0500 | [diff] [blame] | 1120 | |
Thomas Gleixner | dba091b | 2009-12-09 09:32:03 +0100 | [diff] [blame] | 1121 | unsigned int (*get_rr_interval) (struct rq *rq, |
| 1122 | struct task_struct *task); |
Peter Williams | 0d721ce | 2009-09-21 01:31:53 +0000 | [diff] [blame] | 1123 | |
Peter Zijlstra | 810b381 | 2008-02-29 15:21:01 -0500 | [diff] [blame] | 1124 | #ifdef CONFIG_FAIR_GROUP_SCHED |
Peter Zijlstra | b2b5ce0 | 2010-10-15 15:24:15 +0200 | [diff] [blame] | 1125 | void (*task_move_group) (struct task_struct *p, int on_rq); |
Peter Zijlstra | 810b381 | 2008-02-29 15:21:01 -0500 | [diff] [blame] | 1126 | #endif |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 1127 | }; |
| 1128 | |
| 1129 | struct load_weight { |
| 1130 | unsigned long weight, inv_weight; |
| 1131 | }; |
| 1132 | |
Ingo Molnar | 94c1822 | 2007-08-02 17:41:40 +0200 | [diff] [blame] | 1133 | #ifdef CONFIG_SCHEDSTATS |
Lucas De Marchi | 41acab8 | 2010-03-10 23:37:45 -0300 | [diff] [blame] | 1134 | struct sched_statistics { |
Ingo Molnar | 94c1822 | 2007-08-02 17:41:40 +0200 | [diff] [blame] | 1135 | u64 wait_start; |
| 1136 | u64 wait_max; |
Arjan van de Ven | 6d08259 | 2008-01-25 21:08:35 +0100 | [diff] [blame] | 1137 | u64 wait_count; |
| 1138 | u64 wait_sum; |
Arjan van de Ven | 8f0dfc3 | 2009-07-20 11:26:58 -0700 | [diff] [blame] | 1139 | u64 iowait_count; |
| 1140 | u64 iowait_sum; |
Ingo Molnar | 94c1822 | 2007-08-02 17:41:40 +0200 | [diff] [blame] | 1141 | |
| 1142 | u64 sleep_start; |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 1143 | u64 sleep_max; |
Ingo Molnar | 94c1822 | 2007-08-02 17:41:40 +0200 | [diff] [blame] | 1144 | s64 sum_sleep_runtime; |
| 1145 | |
| 1146 | u64 block_start; |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 1147 | u64 block_max; |
| 1148 | u64 exec_max; |
Ingo Molnar | eba1ed4 | 2007-10-15 17:00:02 +0200 | [diff] [blame] | 1149 | u64 slice_max; |
Ingo Molnar | cc36773 | 2007-10-15 17:00:18 +0200 | [diff] [blame] | 1150 | |
Ingo Molnar | cc36773 | 2007-10-15 17:00:18 +0200 | [diff] [blame] | 1151 | u64 nr_migrations_cold; |
| 1152 | u64 nr_failed_migrations_affine; |
| 1153 | u64 nr_failed_migrations_running; |
| 1154 | u64 nr_failed_migrations_hot; |
| 1155 | u64 nr_forced_migrations; |
Ingo Molnar | cc36773 | 2007-10-15 17:00:18 +0200 | [diff] [blame] | 1156 | |
| 1157 | u64 nr_wakeups; |
| 1158 | u64 nr_wakeups_sync; |
| 1159 | u64 nr_wakeups_migrate; |
| 1160 | u64 nr_wakeups_local; |
| 1161 | u64 nr_wakeups_remote; |
| 1162 | u64 nr_wakeups_affine; |
| 1163 | u64 nr_wakeups_affine_attempts; |
| 1164 | u64 nr_wakeups_passive; |
| 1165 | u64 nr_wakeups_idle; |
Lucas De Marchi | 41acab8 | 2010-03-10 23:37:45 -0300 | [diff] [blame] | 1166 | }; |
| 1167 | #endif |
| 1168 | |
| 1169 | struct sched_entity { |
| 1170 | struct load_weight load; /* for load-balancing */ |
| 1171 | struct rb_node run_node; |
| 1172 | struct list_head group_node; |
| 1173 | unsigned int on_rq; |
| 1174 | |
| 1175 | u64 exec_start; |
| 1176 | u64 sum_exec_runtime; |
| 1177 | u64 vruntime; |
| 1178 | u64 prev_sum_exec_runtime; |
| 1179 | |
Lucas De Marchi | 41acab8 | 2010-03-10 23:37:45 -0300 | [diff] [blame] | 1180 | u64 nr_migrations; |
| 1181 | |
Lucas De Marchi | 41acab8 | 2010-03-10 23:37:45 -0300 | [diff] [blame] | 1182 | #ifdef CONFIG_SCHEDSTATS |
| 1183 | struct sched_statistics statistics; |
Ingo Molnar | 94c1822 | 2007-08-02 17:41:40 +0200 | [diff] [blame] | 1184 | #endif |
| 1185 | |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 1186 | #ifdef CONFIG_FAIR_GROUP_SCHED |
| 1187 | struct sched_entity *parent; |
| 1188 | /* rq on which this entity is (to be) queued: */ |
| 1189 | struct cfs_rq *cfs_rq; |
| 1190 | /* rq "owned" by this entity/group: */ |
| 1191 | struct cfs_rq *my_q; |
| 1192 | #endif |
| 1193 | }; |
Ingo Molnar | 70b97a7 | 2006-07-03 00:25:42 -0700 | [diff] [blame] | 1194 | |
Peter Zijlstra | fa71706 | 2008-01-25 21:08:27 +0100 | [diff] [blame] | 1195 | struct sched_rt_entity { |
| 1196 | struct list_head run_list; |
Peter Zijlstra | 78f2c7d | 2008-01-25 21:08:27 +0100 | [diff] [blame] | 1197 | unsigned long timeout; |
Richard Kennedy | bee367e | 2008-08-01 13:24:08 +0100 | [diff] [blame] | 1198 | unsigned int time_slice; |
Peter Zijlstra | 6f505b1 | 2008-01-25 21:08:30 +0100 | [diff] [blame] | 1199 | int nr_cpus_allowed; |
| 1200 | |
Peter Zijlstra | 58d6c2d | 2008-04-19 19:45:00 +0200 | [diff] [blame] | 1201 | struct sched_rt_entity *back; |
Peter Zijlstra | 052f1dc | 2008-02-13 15:45:40 +0100 | [diff] [blame] | 1202 | #ifdef CONFIG_RT_GROUP_SCHED |
Peter Zijlstra | 6f505b1 | 2008-01-25 21:08:30 +0100 | [diff] [blame] | 1203 | struct sched_rt_entity *parent; |
| 1204 | /* rq on which this entity is (to be) queued: */ |
| 1205 | struct rt_rq *rt_rq; |
| 1206 | /* rq "owned" by this entity/group: */ |
| 1207 | struct rt_rq *my_q; |
| 1208 | #endif |
Peter Zijlstra | fa71706 | 2008-01-25 21:08:27 +0100 | [diff] [blame] | 1209 | }; |
| 1210 | |
Paul E. McKenney | 8684896 | 2009-08-27 15:00:12 -0700 | [diff] [blame] | 1211 | struct rcu_node; |
| 1212 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 1213 | enum perf_event_task_context { |
| 1214 | perf_invalid_context = -1, |
| 1215 | perf_hw_context = 0, |
Peter Zijlstra | 89a1e18 | 2010-09-07 17:34:50 +0200 | [diff] [blame] | 1216 | perf_sw_context, |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 1217 | perf_nr_task_contexts, |
| 1218 | }; |
| 1219 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1220 | struct task_struct { |
| 1221 | volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ |
Roman Zippel | f7e4217 | 2007-05-09 02:35:17 -0700 | [diff] [blame] | 1222 | void *stack; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1223 | atomic_t usage; |
William Cohen | 97dc32c | 2007-05-08 00:23:41 -0700 | [diff] [blame] | 1224 | unsigned int flags; /* per process flags, defined below */ |
| 1225 | unsigned int ptrace; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | |
Peter Williams | 2dd73a4 | 2006-06-27 02:54:34 -0700 | [diff] [blame] | 1227 | #ifdef CONFIG_SMP |
Peter Zijlstra | 317f394 | 2011-04-05 17:23:58 +0200 | [diff] [blame] | 1228 | struct task_struct *wake_entry; |
Peter Zijlstra | 3ca7a44 | 2011-04-05 17:23:40 +0200 | [diff] [blame] | 1229 | int on_cpu; |
Nick Piggin | 4866cde | 2005-06-25 14:57:23 -0700 | [diff] [blame] | 1230 | #endif |
Peter Zijlstra | fd2f441 | 2011-04-05 17:23:44 +0200 | [diff] [blame] | 1231 | int on_rq; |
Ingo Molnar | 50e645a | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 1232 | |
Ingo Molnar | b29739f | 2006-06-27 02:54:51 -0700 | [diff] [blame] | 1233 | int prio, static_prio, normal_prio; |
Richard Kennedy | c7aceab | 2008-05-15 12:09:15 +0100 | [diff] [blame] | 1234 | unsigned int rt_priority; |
Ingo Molnar | 5522d5d | 2007-10-15 17:00:12 +0200 | [diff] [blame] | 1235 | const struct sched_class *sched_class; |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 1236 | struct sched_entity se; |
Peter Zijlstra | fa71706 | 2008-01-25 21:08:27 +0100 | [diff] [blame] | 1237 | struct sched_rt_entity rt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1238 | |
Avi Kivity | e107be3 | 2007-07-26 13:40:43 +0200 | [diff] [blame] | 1239 | #ifdef CONFIG_PREEMPT_NOTIFIERS |
| 1240 | /* list of struct preempt_notifier: */ |
| 1241 | struct hlist_head preempt_notifiers; |
| 1242 | #endif |
| 1243 | |
Alexey Dobriyan | 18796aa | 2007-10-16 23:30:26 -0700 | [diff] [blame] | 1244 | /* |
| 1245 | * fpu_counter contains the number of consecutive context switches |
| 1246 | * that the FPU is used. If this is over a threshold, the lazy fpu |
| 1247 | * saving becomes unlazy to save the trap. This is an unsigned char |
| 1248 | * so that after 256 times the counter wraps and the behavior turns |
| 1249 | * lazy again; this to deal with bursty apps that only use FPU for |
| 1250 | * a short time |
| 1251 | */ |
| 1252 | unsigned char fpu_counter; |
Alexey Dobriyan | 6c5c934 | 2006-09-29 01:59:40 -0700 | [diff] [blame] | 1253 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
Jens Axboe | 2056a78 | 2006-03-23 20:00:26 +0100 | [diff] [blame] | 1254 | unsigned int btrace_seq; |
Alexey Dobriyan | 6c5c934 | 2006-09-29 01:59:40 -0700 | [diff] [blame] | 1255 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1256 | |
William Cohen | 97dc32c | 2007-05-08 00:23:41 -0700 | [diff] [blame] | 1257 | unsigned int policy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1258 | cpumask_t cpus_allowed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1259 | |
Paul E. McKenney | a57eb94 | 2010-06-29 16:49:16 -0700 | [diff] [blame] | 1260 | #ifdef CONFIG_PREEMPT_RCU |
Paul E. McKenney | e260be6 | 2008-01-25 21:08:24 +0100 | [diff] [blame] | 1261 | int rcu_read_lock_nesting; |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 1262 | char rcu_read_unlock_special; |
Paul E. McKenney | 7765be2 | 2011-07-14 12:24:11 -0700 | [diff] [blame] | 1263 | #if defined(CONFIG_RCU_BOOST) && defined(CONFIG_TREE_PREEMPT_RCU) |
| 1264 | int rcu_boosted; |
| 1265 | #endif /* #if defined(CONFIG_RCU_BOOST) && defined(CONFIG_TREE_PREEMPT_RCU) */ |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 1266 | struct list_head rcu_node_entry; |
Paul E. McKenney | a57eb94 | 2010-06-29 16:49:16 -0700 | [diff] [blame] | 1267 | #endif /* #ifdef CONFIG_PREEMPT_RCU */ |
| 1268 | #ifdef CONFIG_TREE_PREEMPT_RCU |
| 1269 | struct rcu_node *rcu_blocked_node; |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 1270 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ |
Paul E. McKenney | 24278d1 | 2010-09-27 17:25:23 -0700 | [diff] [blame] | 1271 | #ifdef CONFIG_RCU_BOOST |
| 1272 | struct rt_mutex *rcu_boost_mutex; |
| 1273 | #endif /* #ifdef CONFIG_RCU_BOOST */ |
Paul E. McKenney | e260be6 | 2008-01-25 21:08:24 +0100 | [diff] [blame] | 1274 | |
Chandra Seetharaman | 52f17b6 | 2006-07-14 00:24:38 -0700 | [diff] [blame] | 1275 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1276 | struct sched_info sched_info; |
| 1277 | #endif |
| 1278 | |
| 1279 | struct list_head tasks; |
Dario Faggioli | 806c09a | 2010-11-30 19:51:33 +0100 | [diff] [blame] | 1280 | #ifdef CONFIG_SMP |
Gregory Haskins | 917b627 | 2008-12-29 09:39:53 -0500 | [diff] [blame] | 1281 | struct plist_node pushable_tasks; |
Dario Faggioli | 806c09a | 2010-11-30 19:51:33 +0100 | [diff] [blame] | 1282 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1283 | |
| 1284 | struct mm_struct *mm, *active_mm; |
Jiri Kosina | 4471a67 | 2011-04-14 15:22:09 -0700 | [diff] [blame] | 1285 | #ifdef CONFIG_COMPAT_BRK |
| 1286 | unsigned brk_randomized:1; |
| 1287 | #endif |
KAMEZAWA Hiroyuki | 34e5523 | 2010-03-05 13:41:40 -0800 | [diff] [blame] | 1288 | #if defined(SPLIT_RSS_COUNTING) |
| 1289 | struct task_rss_stat rss_stat; |
| 1290 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1291 | /* task state */ |
William Cohen | 97dc32c | 2007-05-08 00:23:41 -0700 | [diff] [blame] | 1292 | int exit_state; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1293 | int exit_code, exit_signal; |
| 1294 | int pdeath_signal; /* The signal sent when the parent dies */ |
Tejun Heo | e5c1902 | 2011-03-23 10:37:00 +0100 | [diff] [blame] | 1295 | unsigned int group_stop; /* GROUP_STOP_*, siglock protected */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1296 | /* ??? */ |
William Cohen | 97dc32c | 2007-05-08 00:23:41 -0700 | [diff] [blame] | 1297 | unsigned int personality; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1298 | unsigned did_exec:1; |
Kentaro Takeda | f9ce1f1 | 2009-02-05 17:18:11 +0900 | [diff] [blame] | 1299 | unsigned in_execve:1; /* Tell the LSMs that the process is doing an |
| 1300 | * execve */ |
Arjan van de Ven | 8f0dfc3 | 2009-07-20 11:26:58 -0700 | [diff] [blame] | 1301 | unsigned in_iowait:1; |
| 1302 | |
Lennart Poettering | ca94c44 | 2009-06-15 17:17:47 +0200 | [diff] [blame] | 1303 | |
| 1304 | /* Revert to default priority/policy when forking */ |
| 1305 | unsigned sched_reset_on_fork:1; |
Peter Zijlstra | a8e4f2e | 2011-04-05 17:23:49 +0200 | [diff] [blame] | 1306 | unsigned sched_contributes_to_load:1; |
Lennart Poettering | ca94c44 | 2009-06-15 17:17:47 +0200 | [diff] [blame] | 1307 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1308 | pid_t pid; |
| 1309 | pid_t tgid; |
Arjan van de Ven | 0a42540 | 2006-09-26 10:52:38 +0200 | [diff] [blame] | 1310 | |
Hiroshi Shimamoto | 1314562 | 2009-08-18 15:06:02 +0900 | [diff] [blame] | 1311 | #ifdef CONFIG_CC_STACKPROTECTOR |
Arjan van de Ven | 0a42540 | 2006-09-26 10:52:38 +0200 | [diff] [blame] | 1312 | /* Canary value for the -fstack-protector gcc feature */ |
| 1313 | unsigned long stack_canary; |
Hiroshi Shimamoto | 1314562 | 2009-08-18 15:06:02 +0900 | [diff] [blame] | 1314 | #endif |
Ingo Molnar | e003208 | 2008-02-14 08:48:23 +0100 | [diff] [blame] | 1315 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1316 | /* |
| 1317 | * pointers to (original) parent process, youngest child, younger sibling, |
| 1318 | * older sibling, respectively. (p->father can be replaced with |
Roland McGrath | f470021 | 2008-03-24 18:36:23 -0700 | [diff] [blame] | 1319 | * p->real_parent->pid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1320 | */ |
Roland McGrath | f470021 | 2008-03-24 18:36:23 -0700 | [diff] [blame] | 1321 | struct task_struct *real_parent; /* real parent process */ |
| 1322 | struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1323 | /* |
Roland McGrath | f470021 | 2008-03-24 18:36:23 -0700 | [diff] [blame] | 1324 | * children/sibling forms the list of my natural children |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1325 | */ |
| 1326 | struct list_head children; /* list of my children */ |
| 1327 | struct list_head sibling; /* linkage in my parent's children list */ |
| 1328 | struct task_struct *group_leader; /* threadgroup leader */ |
| 1329 | |
Roland McGrath | f470021 | 2008-03-24 18:36:23 -0700 | [diff] [blame] | 1330 | /* |
| 1331 | * ptraced is the list of tasks this task is using ptrace on. |
| 1332 | * This includes both natural children and PTRACE_ATTACH targets. |
| 1333 | * p->ptrace_entry is p's link on the p->parent->ptraced list. |
| 1334 | */ |
| 1335 | struct list_head ptraced; |
| 1336 | struct list_head ptrace_entry; |
| 1337 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1338 | /* PID/PID hash table linkage. */ |
Eric W. Biederman | 92476d7 | 2006-03-31 02:31:42 -0800 | [diff] [blame] | 1339 | struct pid_link pids[PIDTYPE_MAX]; |
Oleg Nesterov | 47e6532 | 2006-03-28 16:11:25 -0800 | [diff] [blame] | 1340 | struct list_head thread_group; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1341 | |
| 1342 | struct completion *vfork_done; /* for vfork() */ |
| 1343 | int __user *set_child_tid; /* CLONE_CHILD_SETTID */ |
| 1344 | int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ |
| 1345 | |
Michael Neuling | c66f08b | 2007-10-18 03:06:34 -0700 | [diff] [blame] | 1346 | cputime_t utime, stime, utimescaled, stimescaled; |
Laurent Vivier | 9ac5231 | 2007-10-15 17:00:19 +0200 | [diff] [blame] | 1347 | cputime_t gtime; |
Hidetoshi Seto | d99ca3b | 2009-12-02 17:26:47 +0900 | [diff] [blame] | 1348 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING |
Balbir Singh | 9301899 | 2007-10-30 00:26:32 +0100 | [diff] [blame] | 1349 | cputime_t prev_utime, prev_stime; |
Hidetoshi Seto | d99ca3b | 2009-12-02 17:26:47 +0900 | [diff] [blame] | 1350 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1351 | unsigned long nvcsw, nivcsw; /* context switch counts */ |
Tomas Janousek | 924b42d | 2007-07-15 23:39:42 -0700 | [diff] [blame] | 1352 | struct timespec start_time; /* monotonic time */ |
| 1353 | struct timespec real_start_time; /* boot based time */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1354 | /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ |
| 1355 | unsigned long min_flt, maj_flt; |
| 1356 | |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 1357 | struct task_cputime cputime_expires; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1358 | struct list_head cpu_timers[3]; |
| 1359 | |
| 1360 | /* process credentials */ |
Arnd Bergmann | 1b0ba1c | 2010-02-24 19:45:09 +0100 | [diff] [blame] | 1361 | const struct cred __rcu *real_cred; /* objective and real subjective task |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 1362 | * credentials (COW) */ |
Arnd Bergmann | 1b0ba1c | 2010-02-24 19:45:09 +0100 | [diff] [blame] | 1363 | const struct cred __rcu *cred; /* effective (overridable) subjective task |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 1364 | * credentials (COW) */ |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 1365 | struct cred *replacement_session_keyring; /* for KEYCTL_SESSION_TO_PARENT */ |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1366 | |
Paolo 'Blaisorblade' Giarrusso | 3677209 | 2005-05-05 16:16:12 -0700 | [diff] [blame] | 1367 | char comm[TASK_COMM_LEN]; /* executable name excluding path |
| 1368 | - access with [gs]et_task_comm (which lock |
| 1369 | it with task_lock()) |
Linus Torvalds | 221af7f | 2010-01-28 22:14:42 -0800 | [diff] [blame] | 1370 | - initialized normally by setup_new_exec */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1371 | /* file system info */ |
| 1372 | int link_count, total_link_count; |
Alexey Dobriyan | 3d5b6fc | 2006-09-29 01:59:40 -0700 | [diff] [blame] | 1373 | #ifdef CONFIG_SYSVIPC |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1374 | /* ipc stuff */ |
| 1375 | struct sysv_sem sysvsem; |
Alexey Dobriyan | 3d5b6fc | 2006-09-29 01:59:40 -0700 | [diff] [blame] | 1376 | #endif |
Mandeep Singh Baines | e162b39 | 2009-01-15 11:08:40 -0800 | [diff] [blame] | 1377 | #ifdef CONFIG_DETECT_HUNG_TASK |
Ingo Molnar | 82a1fcb | 2008-01-25 21:08:02 +0100 | [diff] [blame] | 1378 | /* hung task detection */ |
Ingo Molnar | 82a1fcb | 2008-01-25 21:08:02 +0100 | [diff] [blame] | 1379 | unsigned long last_switch_count; |
| 1380 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1381 | /* CPU-specific state of this task */ |
| 1382 | struct thread_struct thread; |
| 1383 | /* filesystem information */ |
| 1384 | struct fs_struct *fs; |
| 1385 | /* open file information */ |
| 1386 | struct files_struct *files; |
Serge E. Hallyn | 1651e14 | 2006-10-02 02:18:08 -0700 | [diff] [blame] | 1387 | /* namespaces */ |
Serge E. Hallyn | ab51601 | 2006-10-02 02:18:06 -0700 | [diff] [blame] | 1388 | struct nsproxy *nsproxy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1389 | /* signal handlers */ |
| 1390 | struct signal_struct *signal; |
| 1391 | struct sighand_struct *sighand; |
| 1392 | |
| 1393 | sigset_t blocked, real_blocked; |
Roland McGrath | f3de272 | 2008-04-30 00:53:09 -0700 | [diff] [blame] | 1394 | sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1395 | struct sigpending pending; |
| 1396 | |
| 1397 | unsigned long sas_ss_sp; |
| 1398 | size_t sas_ss_size; |
| 1399 | int (*notifier)(void *priv); |
| 1400 | void *notifier_data; |
| 1401 | sigset_t *notifier_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1402 | struct audit_context *audit_context; |
Al Viro | bfef93a | 2008-01-10 04:53:18 -0500 | [diff] [blame] | 1403 | #ifdef CONFIG_AUDITSYSCALL |
| 1404 | uid_t loginuid; |
Eric Paris | 4746ec5 | 2008-01-08 10:06:53 -0500 | [diff] [blame] | 1405 | unsigned int sessionid; |
Al Viro | bfef93a | 2008-01-10 04:53:18 -0500 | [diff] [blame] | 1406 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1407 | seccomp_t seccomp; |
| 1408 | |
| 1409 | /* Thread group tracking */ |
| 1410 | u32 parent_exec_id; |
| 1411 | u32 self_exec_id; |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 1412 | /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, |
| 1413 | * mempolicy */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1414 | spinlock_t alloc_lock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1415 | |
Thomas Gleixner | 3aa551c | 2009-03-23 18:28:15 +0100 | [diff] [blame] | 1416 | #ifdef CONFIG_GENERIC_HARDIRQS |
| 1417 | /* IRQ handler threads */ |
| 1418 | struct irqaction *irqaction; |
| 1419 | #endif |
| 1420 | |
Ingo Molnar | b29739f | 2006-06-27 02:54:51 -0700 | [diff] [blame] | 1421 | /* Protection of the PI data structures: */ |
Thomas Gleixner | 1d61548 | 2009-11-17 14:54:03 +0100 | [diff] [blame] | 1422 | raw_spinlock_t pi_lock; |
Ingo Molnar | b29739f | 2006-06-27 02:54:51 -0700 | [diff] [blame] | 1423 | |
Ingo Molnar | 23f78d4a | 2006-06-27 02:54:53 -0700 | [diff] [blame] | 1424 | #ifdef CONFIG_RT_MUTEXES |
| 1425 | /* PI waiters blocked on a rt_mutex held by this task */ |
| 1426 | struct plist_head pi_waiters; |
| 1427 | /* Deadlock detection and priority inheritance handling */ |
| 1428 | struct rt_mutex_waiter *pi_blocked_on; |
Ingo Molnar | 23f78d4a | 2006-06-27 02:54:53 -0700 | [diff] [blame] | 1429 | #endif |
| 1430 | |
Ingo Molnar | 408894e | 2006-01-09 15:59:20 -0800 | [diff] [blame] | 1431 | #ifdef CONFIG_DEBUG_MUTEXES |
| 1432 | /* mutex deadlock detection */ |
| 1433 | struct mutex_waiter *blocked_on; |
| 1434 | #endif |
Ingo Molnar | de30a2b | 2006-07-03 00:24:42 -0700 | [diff] [blame] | 1435 | #ifdef CONFIG_TRACE_IRQFLAGS |
| 1436 | unsigned int irq_events; |
Ingo Molnar | de30a2b | 2006-07-03 00:24:42 -0700 | [diff] [blame] | 1437 | unsigned long hardirq_enable_ip; |
Ingo Molnar | de30a2b | 2006-07-03 00:24:42 -0700 | [diff] [blame] | 1438 | unsigned long hardirq_disable_ip; |
Hiroshi Shimamoto | fa1452e | 2009-11-30 14:59:44 +0900 | [diff] [blame] | 1439 | unsigned int hardirq_enable_event; |
Ingo Molnar | de30a2b | 2006-07-03 00:24:42 -0700 | [diff] [blame] | 1440 | unsigned int hardirq_disable_event; |
Hiroshi Shimamoto | fa1452e | 2009-11-30 14:59:44 +0900 | [diff] [blame] | 1441 | int hardirqs_enabled; |
Ingo Molnar | de30a2b | 2006-07-03 00:24:42 -0700 | [diff] [blame] | 1442 | int hardirq_context; |
Hiroshi Shimamoto | fa1452e | 2009-11-30 14:59:44 +0900 | [diff] [blame] | 1443 | unsigned long softirq_disable_ip; |
| 1444 | unsigned long softirq_enable_ip; |
| 1445 | unsigned int softirq_disable_event; |
| 1446 | unsigned int softirq_enable_event; |
| 1447 | int softirqs_enabled; |
Ingo Molnar | de30a2b | 2006-07-03 00:24:42 -0700 | [diff] [blame] | 1448 | int softirq_context; |
| 1449 | #endif |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 1450 | #ifdef CONFIG_LOCKDEP |
Peter Zijlstra | bdb9441 | 2008-02-25 23:02:48 +0100 | [diff] [blame] | 1451 | # define MAX_LOCK_DEPTH 48UL |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 1452 | u64 curr_chain_key; |
| 1453 | int lockdep_depth; |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 1454 | unsigned int lockdep_recursion; |
Richard Kennedy | c7aceab | 2008-05-15 12:09:15 +0100 | [diff] [blame] | 1455 | struct held_lock held_locks[MAX_LOCK_DEPTH]; |
Nick Piggin | cf40bd1 | 2009-01-21 08:12:39 +0100 | [diff] [blame] | 1456 | gfp_t lockdep_reclaim_gfp; |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 1457 | #endif |
Ingo Molnar | 408894e | 2006-01-09 15:59:20 -0800 | [diff] [blame] | 1458 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1459 | /* journalling filesystem info */ |
| 1460 | void *journal_info; |
| 1461 | |
Neil Brown | d89d879 | 2007-05-01 09:53:42 +0200 | [diff] [blame] | 1462 | /* stacked block device info */ |
Akinobu Mita | bddd87c | 2010-02-23 08:55:42 +0100 | [diff] [blame] | 1463 | struct bio_list *bio_list; |
Neil Brown | d89d879 | 2007-05-01 09:53:42 +0200 | [diff] [blame] | 1464 | |
Jens Axboe | 73c1010 | 2011-03-08 13:19:51 +0100 | [diff] [blame] | 1465 | #ifdef CONFIG_BLOCK |
| 1466 | /* stack plugging */ |
| 1467 | struct blk_plug *plug; |
| 1468 | #endif |
| 1469 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1470 | /* VM state */ |
| 1471 | struct reclaim_state *reclaim_state; |
| 1472 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1473 | struct backing_dev_info *backing_dev_info; |
| 1474 | |
| 1475 | struct io_context *io_context; |
| 1476 | |
| 1477 | unsigned long ptrace_message; |
| 1478 | siginfo_t *last_siginfo; /* For ptrace use. */ |
Andrew Morton | 7c3ab73 | 2006-12-10 02:19:19 -0800 | [diff] [blame] | 1479 | struct task_io_accounting ioac; |
Jay Lan | 8f0ab51 | 2006-09-30 23:28:59 -0700 | [diff] [blame] | 1480 | #if defined(CONFIG_TASK_XACCT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1481 | u64 acct_rss_mem1; /* accumulated rss usage */ |
| 1482 | u64 acct_vm_mem1; /* accumulated virtual memory usage */ |
Jonathan Lim | 49b5cf3 | 2008-07-25 01:48:40 -0700 | [diff] [blame] | 1483 | cputime_t acct_timexpd; /* stime + utime since last update */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1484 | #endif |
| 1485 | #ifdef CONFIG_CPUSETS |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 1486 | nodemask_t mems_allowed; /* Protected by alloc_lock */ |
Miao Xie | c0ff745 | 2010-05-24 14:32:08 -0700 | [diff] [blame] | 1487 | int mems_allowed_change_disable; |
Paul Jackson | 825a46a | 2006-03-24 03:16:03 -0800 | [diff] [blame] | 1488 | int cpuset_mem_spread_rotor; |
Jack Steiner | 6adef3e | 2010-05-26 14:42:49 -0700 | [diff] [blame] | 1489 | int cpuset_slab_spread_rotor; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1490 | #endif |
Paul Menage | ddbcc7e | 2007-10-18 23:39:30 -0700 | [diff] [blame] | 1491 | #ifdef CONFIG_CGROUPS |
Paul Menage | 817929e | 2007-10-18 23:39:36 -0700 | [diff] [blame] | 1492 | /* Control Group info protected by css_set_lock */ |
Arnd Bergmann | 2c392b8 | 2010-02-24 19:41:39 +0100 | [diff] [blame] | 1493 | struct css_set __rcu *cgroups; |
Paul Menage | 817929e | 2007-10-18 23:39:36 -0700 | [diff] [blame] | 1494 | /* cg_list protected by css_set_lock and tsk->alloc_lock */ |
| 1495 | struct list_head cg_list; |
Paul Menage | ddbcc7e | 2007-10-18 23:39:30 -0700 | [diff] [blame] | 1496 | #endif |
Alexey Dobriyan | 42b2dd0 | 2007-10-16 23:27:30 -0700 | [diff] [blame] | 1497 | #ifdef CONFIG_FUTEX |
Ingo Molnar | 0771dfe | 2006-03-27 01:16:22 -0800 | [diff] [blame] | 1498 | struct robust_list_head __user *robust_list; |
Ingo Molnar | 34f192c | 2006-03-27 01:16:24 -0800 | [diff] [blame] | 1499 | #ifdef CONFIG_COMPAT |
| 1500 | struct compat_robust_list_head __user *compat_robust_list; |
| 1501 | #endif |
Ingo Molnar | c87e283 | 2006-06-27 02:54:58 -0700 | [diff] [blame] | 1502 | struct list_head pi_state_list; |
| 1503 | struct futex_pi_state *pi_state_cache; |
Alexey Dobriyan | 42b2dd0 | 2007-10-16 23:27:30 -0700 | [diff] [blame] | 1504 | #endif |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1505 | #ifdef CONFIG_PERF_EVENTS |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 1506 | struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts]; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1507 | struct mutex perf_event_mutex; |
| 1508 | struct list_head perf_event_list; |
Paul Mackerras | a63eaf3 | 2009-05-22 14:17:31 +1000 | [diff] [blame] | 1509 | #endif |
Richard Kennedy | c7aceab | 2008-05-15 12:09:15 +0100 | [diff] [blame] | 1510 | #ifdef CONFIG_NUMA |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 1511 | struct mempolicy *mempolicy; /* Protected by alloc_lock */ |
Richard Kennedy | c7aceab | 2008-05-15 12:09:15 +0100 | [diff] [blame] | 1512 | short il_next; |
Eric Dumazet | 207205a | 2011-03-22 16:30:44 -0700 | [diff] [blame] | 1513 | short pref_node_fork; |
Richard Kennedy | c7aceab | 2008-05-15 12:09:15 +0100 | [diff] [blame] | 1514 | #endif |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 1515 | atomic_t fs_excl; /* holding fs exclusive resources */ |
Ingo Molnar | e56d090 | 2006-01-08 01:01:37 -0800 | [diff] [blame] | 1516 | struct rcu_head rcu; |
Jens Axboe | b92ce55 | 2006-04-11 13:52:07 +0200 | [diff] [blame] | 1517 | |
| 1518 | /* |
| 1519 | * cache last used pipe for splice |
| 1520 | */ |
| 1521 | struct pipe_inode_info *splice_pipe; |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 1522 | #ifdef CONFIG_TASK_DELAY_ACCT |
| 1523 | struct task_delay_info *delays; |
| 1524 | #endif |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1525 | #ifdef CONFIG_FAULT_INJECTION |
| 1526 | int make_it_fail; |
| 1527 | #endif |
Peter Zijlstra | 3e26c14 | 2007-10-16 23:25:50 -0700 | [diff] [blame] | 1528 | struct prop_local_single dirties; |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 1529 | #ifdef CONFIG_LATENCYTOP |
| 1530 | int latency_record_count; |
| 1531 | struct latency_record latency_record[LT_SAVECOUNT]; |
| 1532 | #endif |
Arjan van de Ven | 6976675 | 2008-09-01 15:52:40 -0700 | [diff] [blame] | 1533 | /* |
| 1534 | * time slack values; these are used to round up poll() and |
| 1535 | * select() etc timeout values. These are in nanoseconds. |
| 1536 | */ |
| 1537 | unsigned long timer_slack_ns; |
| 1538 | unsigned long default_timer_slack_ns; |
David Miller | f8d570a | 2008-11-06 00:37:40 -0800 | [diff] [blame] | 1539 | |
| 1540 | struct list_head *scm_work_list; |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 1541 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
Daniel Mack | 3ad2f3f | 2010-02-03 08:01:28 +0800 | [diff] [blame] | 1542 | /* Index of current stored address in ret_stack */ |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 1543 | int curr_ret_stack; |
| 1544 | /* Stack of return addresses for return function tracing */ |
| 1545 | struct ftrace_ret_stack *ret_stack; |
Steven Rostedt | 8aef2d2 | 2009-03-24 01:10:15 -0400 | [diff] [blame] | 1546 | /* time stamp for last schedule */ |
| 1547 | unsigned long long ftrace_timestamp; |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 1548 | /* |
| 1549 | * Number of functions that haven't been traced |
| 1550 | * because of depth overrun. |
| 1551 | */ |
| 1552 | atomic_t trace_overrun; |
Frederic Weisbecker | 380c4b1 | 2008-12-06 03:43:41 +0100 | [diff] [blame] | 1553 | /* Pause for the tracing */ |
| 1554 | atomic_t tracing_graph_pause; |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 1555 | #endif |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 1556 | #ifdef CONFIG_TRACING |
| 1557 | /* state flags for use by tracers */ |
| 1558 | unsigned long trace; |
Steven Rostedt | b1cff0a | 2011-05-25 14:27:43 -0400 | [diff] [blame] | 1559 | /* bitmask and counter of trace recursion */ |
Steven Rostedt | 261842b | 2009-04-16 21:41:52 -0400 | [diff] [blame] | 1560 | unsigned long trace_recursion; |
| 1561 | #endif /* CONFIG_TRACING */ |
KAMEZAWA Hiroyuki | 569b846 | 2009-12-15 16:47:03 -0800 | [diff] [blame] | 1562 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR /* memcg uses this to do batch job */ |
| 1563 | struct memcg_batch_info { |
| 1564 | int do_batch; /* incremented when batch uncharge started */ |
| 1565 | struct mem_cgroup *memcg; /* target memcg of uncharge */ |
Johannes Weiner | 7ffd4ca | 2011-03-23 16:42:35 -0700 | [diff] [blame] | 1566 | unsigned long nr_pages; /* uncharged usage */ |
| 1567 | unsigned long memsw_nr_pages; /* uncharged mem+swap usage */ |
KAMEZAWA Hiroyuki | 569b846 | 2009-12-15 16:47:03 -0800 | [diff] [blame] | 1568 | } memcg_batch; |
| 1569 | #endif |
Frederic Weisbecker | bf26c01 | 2011-04-07 16:53:20 +0200 | [diff] [blame] | 1570 | #ifdef CONFIG_HAVE_HW_BREAKPOINT |
| 1571 | atomic_t ptrace_bp_refcnt; |
| 1572 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1573 | }; |
| 1574 | |
Rusty Russell | 76e6eee | 2009-03-12 14:35:43 -0600 | [diff] [blame] | 1575 | /* Future-safe accessor for struct task_struct's cpus_allowed. */ |
Rusty Russell | a463681 | 2009-12-17 11:43:29 -0600 | [diff] [blame] | 1576 | #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed) |
Rusty Russell | 76e6eee | 2009-03-12 14:35:43 -0600 | [diff] [blame] | 1577 | |
Ingo Molnar | e05606d | 2007-07-09 18:51:59 +0200 | [diff] [blame] | 1578 | /* |
| 1579 | * Priority of a process goes from 0..MAX_PRIO-1, valid RT |
| 1580 | * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH |
| 1581 | * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority |
| 1582 | * values are inverted: lower p->prio value means higher priority. |
| 1583 | * |
| 1584 | * The MAX_USER_RT_PRIO value allows the actual maximum |
| 1585 | * RT priority to be separate from the value exported to |
| 1586 | * user-space. This allows kernel threads to set their |
| 1587 | * priority to a value higher than any user task. Note: |
| 1588 | * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. |
| 1589 | */ |
| 1590 | |
| 1591 | #define MAX_USER_RT_PRIO 100 |
| 1592 | #define MAX_RT_PRIO MAX_USER_RT_PRIO |
| 1593 | |
| 1594 | #define MAX_PRIO (MAX_RT_PRIO + 40) |
| 1595 | #define DEFAULT_PRIO (MAX_RT_PRIO + 20) |
| 1596 | |
| 1597 | static inline int rt_prio(int prio) |
| 1598 | { |
| 1599 | if (unlikely(prio < MAX_RT_PRIO)) |
| 1600 | return 1; |
| 1601 | return 0; |
| 1602 | } |
| 1603 | |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 1604 | static inline int rt_task(struct task_struct *p) |
Ingo Molnar | e05606d | 2007-07-09 18:51:59 +0200 | [diff] [blame] | 1605 | { |
| 1606 | return rt_prio(p->prio); |
| 1607 | } |
| 1608 | |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 1609 | static inline struct pid *task_pid(struct task_struct *task) |
Eric W. Biederman | 22c935f | 2006-10-02 02:17:09 -0700 | [diff] [blame] | 1610 | { |
| 1611 | return task->pids[PIDTYPE_PID].pid; |
| 1612 | } |
| 1613 | |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 1614 | static inline struct pid *task_tgid(struct task_struct *task) |
Eric W. Biederman | 22c935f | 2006-10-02 02:17:09 -0700 | [diff] [blame] | 1615 | { |
| 1616 | return task->group_leader->pids[PIDTYPE_PID].pid; |
| 1617 | } |
| 1618 | |
Oleg Nesterov | 6dda81f | 2009-04-02 16:58:35 -0700 | [diff] [blame] | 1619 | /* |
| 1620 | * Without tasklist or rcu lock it is not safe to dereference |
| 1621 | * the result of task_pgrp/task_session even if task == current, |
| 1622 | * we can race with another thread doing sys_setsid/sys_setpgid. |
| 1623 | */ |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 1624 | static inline struct pid *task_pgrp(struct task_struct *task) |
Eric W. Biederman | 22c935f | 2006-10-02 02:17:09 -0700 | [diff] [blame] | 1625 | { |
| 1626 | return task->group_leader->pids[PIDTYPE_PGID].pid; |
| 1627 | } |
| 1628 | |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 1629 | static inline struct pid *task_session(struct task_struct *task) |
Eric W. Biederman | 22c935f | 2006-10-02 02:17:09 -0700 | [diff] [blame] | 1630 | { |
| 1631 | return task->group_leader->pids[PIDTYPE_SID].pid; |
| 1632 | } |
| 1633 | |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1634 | struct pid_namespace; |
| 1635 | |
| 1636 | /* |
| 1637 | * the helpers to get the task's different pids as they are seen |
| 1638 | * from various namespaces |
| 1639 | * |
| 1640 | * 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] | 1641 | * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of |
| 1642 | * current. |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1643 | * task_xid_nr_ns() : id seen from the ns specified; |
| 1644 | * |
| 1645 | * set_task_vxid() : assigns a virtual id to a task; |
| 1646 | * |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1647 | * see also pid_nr() etc in include/linux/pid.h |
| 1648 | */ |
Oleg Nesterov | 52ee2df | 2009-04-02 16:58:38 -0700 | [diff] [blame] | 1649 | pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, |
| 1650 | struct pid_namespace *ns); |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1651 | |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 1652 | static inline pid_t task_pid_nr(struct task_struct *tsk) |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1653 | { |
| 1654 | return tsk->pid; |
| 1655 | } |
| 1656 | |
Oleg Nesterov | 52ee2df | 2009-04-02 16:58:38 -0700 | [diff] [blame] | 1657 | static inline pid_t task_pid_nr_ns(struct task_struct *tsk, |
| 1658 | struct pid_namespace *ns) |
| 1659 | { |
| 1660 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns); |
| 1661 | } |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1662 | |
| 1663 | static inline pid_t task_pid_vnr(struct task_struct *tsk) |
| 1664 | { |
Oleg Nesterov | 52ee2df | 2009-04-02 16:58:38 -0700 | [diff] [blame] | 1665 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL); |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1666 | } |
| 1667 | |
| 1668 | |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 1669 | static inline pid_t task_tgid_nr(struct task_struct *tsk) |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1670 | { |
| 1671 | return tsk->tgid; |
| 1672 | } |
| 1673 | |
Pavel Emelyanov | 2f2a3a4 | 2007-10-18 23:40:19 -0700 | [diff] [blame] | 1674 | 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] | 1675 | |
| 1676 | static inline pid_t task_tgid_vnr(struct task_struct *tsk) |
| 1677 | { |
| 1678 | return pid_vnr(task_tgid(tsk)); |
| 1679 | } |
| 1680 | |
| 1681 | |
Oleg Nesterov | 52ee2df | 2009-04-02 16:58:38 -0700 | [diff] [blame] | 1682 | static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, |
| 1683 | struct pid_namespace *ns) |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1684 | { |
Oleg Nesterov | 52ee2df | 2009-04-02 16:58:38 -0700 | [diff] [blame] | 1685 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns); |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1686 | } |
| 1687 | |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1688 | static inline pid_t task_pgrp_vnr(struct task_struct *tsk) |
| 1689 | { |
Oleg Nesterov | 52ee2df | 2009-04-02 16:58:38 -0700 | [diff] [blame] | 1690 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL); |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1691 | } |
| 1692 | |
| 1693 | |
Oleg Nesterov | 52ee2df | 2009-04-02 16:58:38 -0700 | [diff] [blame] | 1694 | static inline pid_t task_session_nr_ns(struct task_struct *tsk, |
| 1695 | struct pid_namespace *ns) |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1696 | { |
Oleg Nesterov | 52ee2df | 2009-04-02 16:58:38 -0700 | [diff] [blame] | 1697 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns); |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1698 | } |
| 1699 | |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1700 | static inline pid_t task_session_vnr(struct task_struct *tsk) |
| 1701 | { |
Oleg Nesterov | 52ee2df | 2009-04-02 16:58:38 -0700 | [diff] [blame] | 1702 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL); |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1703 | } |
| 1704 | |
Oleg Nesterov | 1b0f7ff | 2009-04-02 16:58:39 -0700 | [diff] [blame] | 1705 | /* obsolete, do not use */ |
| 1706 | static inline pid_t task_pgrp_nr(struct task_struct *tsk) |
| 1707 | { |
| 1708 | return task_pgrp_nr_ns(tsk, &init_pid_ns); |
| 1709 | } |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1710 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1711 | /** |
| 1712 | * pid_alive - check that a task structure is not stale |
| 1713 | * @p: Task structure to be checked. |
| 1714 | * |
| 1715 | * Test if a process is not yet dead (at most zombie state) |
| 1716 | * If pid_alive fails, then pointers within the task structure |
| 1717 | * can be stale and must not be dereferenced. |
| 1718 | */ |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 1719 | static inline int pid_alive(struct task_struct *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1720 | { |
Eric W. Biederman | 92476d7 | 2006-03-31 02:31:42 -0800 | [diff] [blame] | 1721 | return p->pids[PIDTYPE_PID].pid != NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1722 | } |
| 1723 | |
Sukadev Bhattiprolu | f400e19 | 2006-09-29 02:00:07 -0700 | [diff] [blame] | 1724 | /** |
Serge E. Hallyn | b460cbc | 2007-10-18 23:39:52 -0700 | [diff] [blame] | 1725 | * is_global_init - check if a task structure is init |
Henne | 3260259 | 2006-10-06 00:44:01 -0700 | [diff] [blame] | 1726 | * @tsk: Task structure to be checked. |
| 1727 | * |
| 1728 | * 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] | 1729 | */ |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 1730 | static inline int is_global_init(struct task_struct *tsk) |
Pavel Emelyanov | b461cc0 | 2007-10-18 23:40:09 -0700 | [diff] [blame] | 1731 | { |
| 1732 | return tsk->pid == 1; |
| 1733 | } |
Serge E. Hallyn | b460cbc | 2007-10-18 23:39:52 -0700 | [diff] [blame] | 1734 | |
| 1735 | /* |
| 1736 | * is_container_init: |
| 1737 | * check whether in the task is init in its own pid namespace. |
| 1738 | */ |
Pavel Emelyanov | b461cc0 | 2007-10-18 23:40:09 -0700 | [diff] [blame] | 1739 | extern int is_container_init(struct task_struct *tsk); |
Sukadev Bhattiprolu | f400e19 | 2006-09-29 02:00:07 -0700 | [diff] [blame] | 1740 | |
Cedric Le Goater | 9ec5209 | 2006-10-02 02:19:00 -0700 | [diff] [blame] | 1741 | extern struct pid *cad_pid; |
| 1742 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1743 | extern void free_task(struct task_struct *tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1744 | #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) |
Ingo Molnar | e56d090 | 2006-01-08 01:01:37 -0800 | [diff] [blame] | 1745 | |
Andrew Morton | 158d9eb | 2006-03-31 02:31:34 -0800 | [diff] [blame] | 1746 | extern void __put_task_struct(struct task_struct *t); |
Ingo Molnar | e56d090 | 2006-01-08 01:01:37 -0800 | [diff] [blame] | 1747 | |
| 1748 | static inline void put_task_struct(struct task_struct *t) |
| 1749 | { |
| 1750 | if (atomic_dec_and_test(&t->usage)) |
Eric W. Biederman | 8c7904a | 2006-03-31 02:31:37 -0800 | [diff] [blame] | 1751 | __put_task_struct(t); |
Ingo Molnar | e56d090 | 2006-01-08 01:01:37 -0800 | [diff] [blame] | 1752 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1753 | |
Hidetoshi Seto | d180c5b | 2009-11-26 14:48:30 +0900 | [diff] [blame] | 1754 | 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] | 1755 | 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] | 1756 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1757 | /* |
| 1758 | * Per process flags |
| 1759 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1760 | #define PF_STARTING 0x00000002 /* being created */ |
| 1761 | #define PF_EXITING 0x00000004 /* getting shut down */ |
Alexey Kuznetsov | 778e9a9 | 2007-06-08 13:47:00 -0700 | [diff] [blame] | 1762 | #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ |
Laurent Vivier | 94886b8 | 2007-10-15 17:00:19 +0200 | [diff] [blame] | 1763 | #define PF_VCPU 0x00000010 /* I'm a virtual CPU */ |
Tejun Heo | 21aa9af | 2010-06-08 21:40:37 +0200 | [diff] [blame] | 1764 | #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1765 | #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ |
Andi Kleen | 4db96cf | 2009-09-16 11:50:14 +0200 | [diff] [blame] | 1766 | #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1767 | #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ |
| 1768 | #define PF_DUMPCORE 0x00000200 /* dumped core */ |
| 1769 | #define PF_SIGNALED 0x00000400 /* killed by a signal */ |
| 1770 | #define PF_MEMALLOC 0x00000800 /* Allocating memory */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1771 | #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ |
Thomas Gleixner | 6301cb9 | 2009-07-17 14:15:47 +0200 | [diff] [blame] | 1772 | #define PF_FREEZING 0x00004000 /* freeze in progress. do not account to load */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1773 | #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ |
| 1774 | #define PF_FROZEN 0x00010000 /* frozen for system suspend */ |
| 1775 | #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ |
| 1776 | #define PF_KSWAPD 0x00040000 /* I am kswapd */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1777 | #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ |
Oleg Nesterov | 246bb0b | 2008-07-25 01:47:38 -0700 | [diff] [blame] | 1778 | #define PF_KTHREAD 0x00200000 /* I am a kernel thread */ |
Jens Axboe | b31dc66 | 2006-06-13 08:26:10 +0200 | [diff] [blame] | 1779 | #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ |
| 1780 | #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ |
| 1781 | #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */ |
| 1782 | #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */ |
David Rientjes | 9985b0b | 2008-06-05 12:57:11 -0700 | [diff] [blame] | 1783 | #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */ |
Andi Kleen | 4db96cf | 2009-09-16 11:50:14 +0200 | [diff] [blame] | 1784 | #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */ |
Paul Jackson | c61afb1 | 2006-03-24 03:16:08 -0800 | [diff] [blame] | 1785 | #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */ |
Thomas Gleixner | 61a8712 | 2006-06-27 02:54:56 -0700 | [diff] [blame] | 1786 | #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ |
Tejun Heo | 58a69cb | 2011-02-16 09:25:31 +0100 | [diff] [blame] | 1787 | #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */ |
Rafael J. Wysocki | ebb12db | 2008-06-11 22:04:29 +0200 | [diff] [blame] | 1788 | #define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1789 | |
| 1790 | /* |
| 1791 | * Only the _current_ task can read/write to tsk->flags, but other |
| 1792 | * tasks can access tsk->flags in readonly mode for example |
| 1793 | * with tsk_used_math (like during threaded core dumping). |
| 1794 | * There is however an exception to this rule during ptrace |
| 1795 | * or during fork: the ptracer task is allowed to write to the |
| 1796 | * child->flags of its traced child (same goes for fork, the parent |
| 1797 | * can write to the child->flags), because we're guaranteed the |
| 1798 | * child is not running and in turn not changing child->flags |
| 1799 | * at the same time the parent does it. |
| 1800 | */ |
| 1801 | #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) |
| 1802 | #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) |
| 1803 | #define clear_used_math() clear_stopped_child_used_math(current) |
| 1804 | #define set_used_math() set_stopped_child_used_math(current) |
| 1805 | #define conditional_stopped_child_used_math(condition, child) \ |
| 1806 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) |
| 1807 | #define conditional_used_math(condition) \ |
| 1808 | conditional_stopped_child_used_math(condition, current) |
| 1809 | #define copy_to_stopped_child_used_math(child) \ |
| 1810 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) |
| 1811 | /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ |
| 1812 | #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) |
| 1813 | #define used_math() tsk_used_math(current) |
| 1814 | |
Tejun Heo | e5c1902 | 2011-03-23 10:37:00 +0100 | [diff] [blame] | 1815 | /* |
| 1816 | * task->group_stop flags |
| 1817 | */ |
Tejun Heo | d79fdd6 | 2011-03-23 10:37:00 +0100 | [diff] [blame] | 1818 | #define GROUP_STOP_SIGMASK 0xffff /* signr of the last group stop */ |
Tejun Heo | 39efa3e | 2011-03-23 10:37:00 +0100 | [diff] [blame] | 1819 | #define GROUP_STOP_PENDING (1 << 16) /* task should stop for group stop */ |
Tejun Heo | e5c1902 | 2011-03-23 10:37:00 +0100 | [diff] [blame] | 1820 | #define GROUP_STOP_CONSUME (1 << 17) /* consume group stop count */ |
Tejun Heo | d79fdd6 | 2011-03-23 10:37:00 +0100 | [diff] [blame] | 1821 | #define GROUP_STOP_TRAPPING (1 << 18) /* switching from STOPPED to TRACED */ |
Oleg Nesterov | ee77f07 | 2011-04-01 20:12:38 +0200 | [diff] [blame] | 1822 | #define GROUP_STOP_DEQUEUED (1 << 19) /* stop signal dequeued */ |
Tejun Heo | e5c1902 | 2011-03-23 10:37:00 +0100 | [diff] [blame] | 1823 | |
Tejun Heo | 39efa3e | 2011-03-23 10:37:00 +0100 | [diff] [blame] | 1824 | extern void task_clear_group_stop_pending(struct task_struct *task); |
| 1825 | |
Paul E. McKenney | a57eb94 | 2010-06-29 16:49:16 -0700 | [diff] [blame] | 1826 | #ifdef CONFIG_PREEMPT_RCU |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 1827 | |
| 1828 | #define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */ |
Paul E. McKenney | 24278d1 | 2010-09-27 17:25:23 -0700 | [diff] [blame] | 1829 | #define RCU_READ_UNLOCK_BOOSTED (1 << 1) /* boosted while in RCU read-side. */ |
| 1830 | #define RCU_READ_UNLOCK_NEED_QS (1 << 2) /* RCU core needs CPU response. */ |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 1831 | |
| 1832 | static inline void rcu_copy_process(struct task_struct *p) |
| 1833 | { |
| 1834 | p->rcu_read_lock_nesting = 0; |
| 1835 | p->rcu_read_unlock_special = 0; |
Paul E. McKenney | a57eb94 | 2010-06-29 16:49:16 -0700 | [diff] [blame] | 1836 | #ifdef CONFIG_TREE_PREEMPT_RCU |
Paul E. McKenney | dd5d19b | 2009-08-27 14:58:16 -0700 | [diff] [blame] | 1837 | p->rcu_blocked_node = NULL; |
Paul E. McKenney | 24278d1 | 2010-09-27 17:25:23 -0700 | [diff] [blame] | 1838 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ |
| 1839 | #ifdef CONFIG_RCU_BOOST |
| 1840 | p->rcu_boost_mutex = NULL; |
| 1841 | #endif /* #ifdef CONFIG_RCU_BOOST */ |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 1842 | INIT_LIST_HEAD(&p->rcu_node_entry); |
| 1843 | } |
| 1844 | |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 1845 | #else |
| 1846 | |
| 1847 | static inline void rcu_copy_process(struct task_struct *p) |
| 1848 | { |
| 1849 | } |
| 1850 | |
| 1851 | #endif |
| 1852 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1853 | #ifdef CONFIG_SMP |
KOSAKI Motohiro | 1e1b6c5 | 2011-05-19 15:08:58 +0900 | [diff] [blame] | 1854 | extern void do_set_cpus_allowed(struct task_struct *p, |
| 1855 | const struct cpumask *new_mask); |
| 1856 | |
Mike Travis | cd8ba7c | 2008-03-26 14:23:49 -0700 | [diff] [blame] | 1857 | extern int set_cpus_allowed_ptr(struct task_struct *p, |
Rusty Russell | 96f874e | 2008-11-25 02:35:14 +1030 | [diff] [blame] | 1858 | const struct cpumask *new_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1859 | #else |
KOSAKI Motohiro | 1e1b6c5 | 2011-05-19 15:08:58 +0900 | [diff] [blame] | 1860 | static inline void do_set_cpus_allowed(struct task_struct *p, |
| 1861 | const struct cpumask *new_mask) |
| 1862 | { |
| 1863 | } |
Mike Travis | cd8ba7c | 2008-03-26 14:23:49 -0700 | [diff] [blame] | 1864 | static inline int set_cpus_allowed_ptr(struct task_struct *p, |
Rusty Russell | 96f874e | 2008-11-25 02:35:14 +1030 | [diff] [blame] | 1865 | const struct cpumask *new_mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1866 | { |
Rusty Russell | 96f874e | 2008-11-25 02:35:14 +1030 | [diff] [blame] | 1867 | if (!cpumask_test_cpu(0, new_mask)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1868 | return -EINVAL; |
| 1869 | return 0; |
| 1870 | } |
| 1871 | #endif |
Rusty Russell | e0ad955 | 2009-09-24 09:34:38 -0600 | [diff] [blame] | 1872 | |
| 1873 | #ifndef CONFIG_CPUMASK_OFFSTACK |
Mike Travis | cd8ba7c | 2008-03-26 14:23:49 -0700 | [diff] [blame] | 1874 | static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) |
| 1875 | { |
| 1876 | return set_cpus_allowed_ptr(p, &new_mask); |
| 1877 | } |
Rusty Russell | e0ad955 | 2009-09-24 09:34:38 -0600 | [diff] [blame] | 1878 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1879 | |
Ingo Molnar | b342501 | 2009-02-26 20:20:29 +0100 | [diff] [blame] | 1880 | /* |
Peter Zijlstra | c676329 | 2010-05-25 10:48:51 +0200 | [diff] [blame] | 1881 | * Do not use outside of architecture code which knows its limitations. |
| 1882 | * |
| 1883 | * sched_clock() has no promise of monotonicity or bounded drift between |
| 1884 | * CPUs, use (which you should not) requires disabling IRQs. |
| 1885 | * |
| 1886 | * Please use one of the three interfaces below. |
Ingo Molnar | b342501 | 2009-02-26 20:20:29 +0100 | [diff] [blame] | 1887 | */ |
Mike Frysinger | 1bbfa6f | 2009-12-09 20:07:03 -0500 | [diff] [blame] | 1888 | extern unsigned long long notrace sched_clock(void); |
Peter Zijlstra | c676329 | 2010-05-25 10:48:51 +0200 | [diff] [blame] | 1889 | /* |
| 1890 | * See the comment in kernel/sched_clock.c |
| 1891 | */ |
| 1892 | extern u64 cpu_clock(int cpu); |
| 1893 | extern u64 local_clock(void); |
| 1894 | extern u64 sched_clock_cpu(int cpu); |
| 1895 | |
Ingo Molnar | e436d80 | 2007-07-19 21:28:35 +0200 | [diff] [blame] | 1896 | |
Peter Zijlstra | c1955a3 | 2008-08-11 08:59:03 +0200 | [diff] [blame] | 1897 | extern void sched_clock_init(void); |
Peter Zijlstra | c1955a3 | 2008-08-11 08:59:03 +0200 | [diff] [blame] | 1898 | |
Peter Zijlstra | 3e51f33 | 2008-05-03 18:29:28 +0200 | [diff] [blame] | 1899 | #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK |
Peter Zijlstra | 3e51f33 | 2008-05-03 18:29:28 +0200 | [diff] [blame] | 1900 | static inline void sched_clock_tick(void) |
| 1901 | { |
| 1902 | } |
| 1903 | |
| 1904 | static inline void sched_clock_idle_sleep_event(void) |
| 1905 | { |
| 1906 | } |
| 1907 | |
| 1908 | static inline void sched_clock_idle_wakeup_event(u64 delta_ns) |
| 1909 | { |
| 1910 | } |
| 1911 | #else |
Peter Zijlstra | c676329 | 2010-05-25 10:48:51 +0200 | [diff] [blame] | 1912 | /* |
| 1913 | * Architectures can set this to 1 if they have specified |
| 1914 | * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig, |
| 1915 | * but then during bootup it turns out that sched_clock() |
| 1916 | * is reliable after all: |
| 1917 | */ |
| 1918 | extern int sched_clock_stable; |
| 1919 | |
Peter Zijlstra | 3e51f33 | 2008-05-03 18:29:28 +0200 | [diff] [blame] | 1920 | extern void sched_clock_tick(void); |
| 1921 | extern void sched_clock_idle_sleep_event(void); |
| 1922 | extern void sched_clock_idle_wakeup_event(u64 delta_ns); |
| 1923 | #endif |
| 1924 | |
Venkatesh Pallipadi | b52bfee | 2010-10-04 17:03:19 -0700 | [diff] [blame] | 1925 | #ifdef CONFIG_IRQ_TIME_ACCOUNTING |
| 1926 | /* |
| 1927 | * An i/f to runtime opt-in for irq time accounting based off of sched_clock. |
| 1928 | * The reason for this explicit opt-in is not to have perf penalty with |
| 1929 | * slow sched_clocks. |
| 1930 | */ |
| 1931 | extern void enable_sched_clock_irqtime(void); |
| 1932 | extern void disable_sched_clock_irqtime(void); |
| 1933 | #else |
| 1934 | static inline void enable_sched_clock_irqtime(void) {} |
| 1935 | static inline void disable_sched_clock_irqtime(void) {} |
| 1936 | #endif |
| 1937 | |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 1938 | extern unsigned long long |
Ingo Molnar | 41b86e9 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 1939 | task_sched_runtime(struct task_struct *task); |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 1940 | extern unsigned long long thread_group_sched_runtime(struct task_struct *task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1941 | |
| 1942 | /* sched_exec is called by processes performing an exec */ |
| 1943 | #ifdef CONFIG_SMP |
| 1944 | extern void sched_exec(void); |
| 1945 | #else |
| 1946 | #define sched_exec() {} |
| 1947 | #endif |
| 1948 | |
Ingo Molnar | 2aa44d0 | 2007-08-23 15:18:02 +0200 | [diff] [blame] | 1949 | extern void sched_clock_idle_sleep_event(void); |
| 1950 | extern void sched_clock_idle_wakeup_event(u64 delta_ns); |
Ingo Molnar | bb29ab2 | 2007-07-09 18:51:59 +0200 | [diff] [blame] | 1951 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1952 | #ifdef CONFIG_HOTPLUG_CPU |
| 1953 | extern void idle_task_exit(void); |
| 1954 | #else |
| 1955 | static inline void idle_task_exit(void) {} |
| 1956 | #endif |
| 1957 | |
Thomas Gleixner | 06d8308 | 2008-03-22 09:20:24 +0100 | [diff] [blame] | 1958 | #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP) |
| 1959 | extern void wake_up_idle_cpu(int cpu); |
| 1960 | #else |
| 1961 | static inline void wake_up_idle_cpu(int cpu) { } |
| 1962 | #endif |
| 1963 | |
Peter Zijlstra | 2180508 | 2007-08-25 18:41:53 +0200 | [diff] [blame] | 1964 | extern unsigned int sysctl_sched_latency; |
Peter Zijlstra | b2be5e9 | 2007-11-09 22:39:37 +0100 | [diff] [blame] | 1965 | extern unsigned int sysctl_sched_min_granularity; |
Ingo Molnar | bf0f6f2 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 1966 | extern unsigned int sysctl_sched_wakeup_granularity; |
Ingo Molnar | bf0f6f2 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 1967 | extern unsigned int sysctl_sched_child_runs_first; |
Christian Ehrhardt | 1983a92 | 2009-11-30 12:16:47 +0100 | [diff] [blame] | 1968 | |
| 1969 | enum sched_tunable_scaling { |
| 1970 | SCHED_TUNABLESCALING_NONE, |
| 1971 | SCHED_TUNABLESCALING_LOG, |
| 1972 | SCHED_TUNABLESCALING_LINEAR, |
| 1973 | SCHED_TUNABLESCALING_END, |
| 1974 | }; |
| 1975 | extern enum sched_tunable_scaling sysctl_sched_tunable_scaling; |
| 1976 | |
Mike Galbraith | 2bba22c | 2009-09-09 15:41:37 +0200 | [diff] [blame] | 1977 | #ifdef CONFIG_SCHED_DEBUG |
Ingo Molnar | da84d96 | 2007-10-15 17:00:18 +0200 | [diff] [blame] | 1978 | extern unsigned int sysctl_sched_migration_cost; |
Peter Zijlstra | b82d9fd | 2007-11-09 22:39:39 +0100 | [diff] [blame] | 1979 | extern unsigned int sysctl_sched_nr_migrate; |
Peter Zijlstra | e9e9250 | 2009-09-01 10:34:37 +0200 | [diff] [blame] | 1980 | extern unsigned int sysctl_sched_time_avg; |
Arun R Bharadwaj | cd1bb94 | 2009-04-16 12:15:34 +0530 | [diff] [blame] | 1981 | extern unsigned int sysctl_timer_migration; |
Paul Turner | a7a4f8a | 2010-11-15 15:47:06 -0800 | [diff] [blame] | 1982 | extern unsigned int sysctl_sched_shares_window; |
Peter Zijlstra | b2be5e9 | 2007-11-09 22:39:37 +0100 | [diff] [blame] | 1983 | |
Christian Ehrhardt | 1983a92 | 2009-11-30 12:16:47 +0100 | [diff] [blame] | 1984 | int sched_proc_update_handler(struct ctl_table *table, int write, |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 1985 | void __user *buffer, size_t *length, |
Peter Zijlstra | b2be5e9 | 2007-11-09 22:39:37 +0100 | [diff] [blame] | 1986 | loff_t *ppos); |
Ingo Molnar | 2bd8e6d | 2007-10-15 17:00:02 +0200 | [diff] [blame] | 1987 | #endif |
Arun R Bharadwaj | eea08f3 | 2009-04-16 12:16:41 +0530 | [diff] [blame] | 1988 | #ifdef CONFIG_SCHED_DEBUG |
| 1989 | static inline unsigned int get_sysctl_timer_migration(void) |
| 1990 | { |
| 1991 | return sysctl_timer_migration; |
| 1992 | } |
| 1993 | #else |
| 1994 | static inline unsigned int get_sysctl_timer_migration(void) |
| 1995 | { |
| 1996 | return 1; |
| 1997 | } |
| 1998 | #endif |
Peter Zijlstra | 9f0c1e5 | 2008-02-13 15:45:39 +0100 | [diff] [blame] | 1999 | extern unsigned int sysctl_sched_rt_period; |
| 2000 | extern int sysctl_sched_rt_runtime; |
Ingo Molnar | 2bd8e6d | 2007-10-15 17:00:02 +0200 | [diff] [blame] | 2001 | |
Peter Zijlstra | d0b27fa | 2008-04-19 19:44:57 +0200 | [diff] [blame] | 2002 | int sched_rt_handler(struct ctl_table *table, int write, |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 2003 | void __user *buffer, size_t *lenp, |
Peter Zijlstra | d0b27fa | 2008-04-19 19:44:57 +0200 | [diff] [blame] | 2004 | loff_t *ppos); |
| 2005 | |
Mike Galbraith | 5091faa | 2010-11-30 14:18:03 +0100 | [diff] [blame] | 2006 | #ifdef CONFIG_SCHED_AUTOGROUP |
| 2007 | extern unsigned int sysctl_sched_autogroup_enabled; |
| 2008 | |
| 2009 | extern void sched_autogroup_create_attach(struct task_struct *p); |
| 2010 | extern void sched_autogroup_detach(struct task_struct *p); |
| 2011 | extern void sched_autogroup_fork(struct signal_struct *sig); |
| 2012 | extern void sched_autogroup_exit(struct signal_struct *sig); |
| 2013 | #ifdef CONFIG_PROC_FS |
| 2014 | extern void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m); |
| 2015 | extern int proc_sched_autogroup_set_nice(struct task_struct *p, int *nice); |
| 2016 | #endif |
| 2017 | #else |
| 2018 | static inline void sched_autogroup_create_attach(struct task_struct *p) { } |
| 2019 | static inline void sched_autogroup_detach(struct task_struct *p) { } |
| 2020 | static inline void sched_autogroup_fork(struct signal_struct *sig) { } |
| 2021 | static inline void sched_autogroup_exit(struct signal_struct *sig) { } |
| 2022 | #endif |
| 2023 | |
Ingo Molnar | b29739f | 2006-06-27 02:54:51 -0700 | [diff] [blame] | 2024 | #ifdef CONFIG_RT_MUTEXES |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 2025 | extern int rt_mutex_getprio(struct task_struct *p); |
| 2026 | extern void rt_mutex_setprio(struct task_struct *p, int prio); |
| 2027 | extern void rt_mutex_adjust_pi(struct task_struct *p); |
Ingo Molnar | b29739f | 2006-06-27 02:54:51 -0700 | [diff] [blame] | 2028 | #else |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 2029 | static inline int rt_mutex_getprio(struct task_struct *p) |
Ingo Molnar | b29739f | 2006-06-27 02:54:51 -0700 | [diff] [blame] | 2030 | { |
| 2031 | return p->normal_prio; |
| 2032 | } |
Thomas Gleixner | 95e02ca | 2006-06-27 02:55:02 -0700 | [diff] [blame] | 2033 | # define rt_mutex_adjust_pi(p) do { } while (0) |
Ingo Molnar | b29739f | 2006-06-27 02:54:51 -0700 | [diff] [blame] | 2034 | #endif |
| 2035 | |
Mike Galbraith | d95f412 | 2011-02-01 09:50:51 -0500 | [diff] [blame] | 2036 | extern bool yield_to(struct task_struct *p, bool preempt); |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 2037 | extern void set_user_nice(struct task_struct *p, long nice); |
| 2038 | extern int task_prio(const struct task_struct *p); |
| 2039 | extern int task_nice(const struct task_struct *p); |
| 2040 | extern int can_nice(const struct task_struct *p, const int nice); |
| 2041 | extern int task_curr(const struct task_struct *p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2042 | extern int idle_cpu(int cpu); |
KOSAKI Motohiro | fe7de49 | 2010-10-20 16:01:12 -0700 | [diff] [blame] | 2043 | extern int sched_setscheduler(struct task_struct *, int, |
| 2044 | const struct sched_param *); |
Rusty Russell | 961ccdd | 2008-06-23 13:55:38 +1000 | [diff] [blame] | 2045 | extern int sched_setscheduler_nocheck(struct task_struct *, int, |
KOSAKI Motohiro | fe7de49 | 2010-10-20 16:01:12 -0700 | [diff] [blame] | 2046 | const struct sched_param *); |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 2047 | extern struct task_struct *idle_task(int cpu); |
| 2048 | extern struct task_struct *curr_task(int cpu); |
| 2049 | extern void set_curr_task(int cpu, struct task_struct *p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2050 | |
| 2051 | void yield(void); |
| 2052 | |
| 2053 | /* |
| 2054 | * The default (Linux) execution domain. |
| 2055 | */ |
| 2056 | extern struct exec_domain default_exec_domain; |
| 2057 | |
| 2058 | union thread_union { |
| 2059 | struct thread_info thread_info; |
| 2060 | unsigned long stack[THREAD_SIZE/sizeof(long)]; |
| 2061 | }; |
| 2062 | |
| 2063 | #ifndef __HAVE_ARCH_KSTACK_END |
| 2064 | static inline int kstack_end(void *addr) |
| 2065 | { |
| 2066 | /* Reliable end of stack detection: |
| 2067 | * Some APM bios versions misalign the stack |
| 2068 | */ |
| 2069 | return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); |
| 2070 | } |
| 2071 | #endif |
| 2072 | |
| 2073 | extern union thread_union init_thread_union; |
| 2074 | extern struct task_struct init_task; |
| 2075 | |
| 2076 | extern struct mm_struct init_mm; |
| 2077 | |
Pavel Emelyanov | 198fe21 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 2078 | extern struct pid_namespace init_pid_ns; |
| 2079 | |
| 2080 | /* |
| 2081 | * find a task by one of its numerical ids |
| 2082 | * |
Pavel Emelyanov | 198fe21 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 2083 | * find_task_by_pid_ns(): |
| 2084 | * finds a task by its pid in the specified namespace |
Pavel Emelyanov | 228ebcb | 2007-10-18 23:40:16 -0700 | [diff] [blame] | 2085 | * find_task_by_vpid(): |
| 2086 | * finds a task by its virtual pid |
Pavel Emelyanov | 198fe21 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 2087 | * |
Pavel Emelyanov | e49859e | 2008-07-25 01:48:36 -0700 | [diff] [blame] | 2088 | * see also find_vpid() etc in include/linux/pid.h |
Pavel Emelyanov | 198fe21 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 2089 | */ |
| 2090 | |
Pavel Emelyanov | 228ebcb | 2007-10-18 23:40:16 -0700 | [diff] [blame] | 2091 | extern struct task_struct *find_task_by_vpid(pid_t nr); |
| 2092 | extern struct task_struct *find_task_by_pid_ns(pid_t nr, |
| 2093 | struct pid_namespace *ns); |
Pavel Emelyanov | 198fe21 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 2094 | |
Oleg Nesterov | 8520d7c | 2008-02-08 04:19:09 -0800 | [diff] [blame] | 2095 | extern void __set_special_pids(struct pid *pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2096 | |
| 2097 | /* per-UID process charging. */ |
Cedric Le Goater | acce292 | 2007-07-15 23:40:59 -0700 | [diff] [blame] | 2098 | extern struct user_struct * alloc_uid(struct user_namespace *, uid_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2099 | static inline struct user_struct *get_uid(struct user_struct *u) |
| 2100 | { |
| 2101 | atomic_inc(&u->__count); |
| 2102 | return u; |
| 2103 | } |
| 2104 | extern void free_uid(struct user_struct *); |
Pavel Emelyanov | 28f300d | 2007-09-18 22:46:45 -0700 | [diff] [blame] | 2105 | extern void release_uids(struct user_namespace *ns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2106 | |
| 2107 | #include <asm/current.h> |
| 2108 | |
Torben Hohn | f0af911a9 | 2011-01-27 15:59:10 +0100 | [diff] [blame] | 2109 | extern void xtime_update(unsigned long ticks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2110 | |
Harvey Harrison | b3c9752 | 2008-02-13 15:03:15 -0800 | [diff] [blame] | 2111 | extern int wake_up_state(struct task_struct *tsk, unsigned int state); |
| 2112 | extern int wake_up_process(struct task_struct *tsk); |
Samir Bellabes | 3e51e3e | 2011-05-11 18:18:05 +0200 | [diff] [blame] | 2113 | extern void wake_up_new_task(struct task_struct *tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2114 | #ifdef CONFIG_SMP |
| 2115 | extern void kick_process(struct task_struct *tsk); |
| 2116 | #else |
| 2117 | static inline void kick_process(struct task_struct *tsk) { } |
| 2118 | #endif |
Samir Bellabes | 3e51e3e | 2011-05-11 18:18:05 +0200 | [diff] [blame] | 2119 | extern void sched_fork(struct task_struct *p); |
Ingo Molnar | ad46c2c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 2120 | extern void sched_dead(struct task_struct *p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2121 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2122 | extern void proc_caches_init(void); |
| 2123 | extern void flush_signals(struct task_struct *); |
David Howells | 3bcac02 | 2009-04-29 13:45:05 +0100 | [diff] [blame] | 2124 | extern void __flush_signals(struct task_struct *); |
Oleg Nesterov | 10ab825 | 2007-05-09 02:34:37 -0700 | [diff] [blame] | 2125 | extern void ignore_signals(struct task_struct *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2126 | extern void flush_signal_handlers(struct task_struct *, int force_default); |
| 2127 | extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); |
| 2128 | |
| 2129 | static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) |
| 2130 | { |
| 2131 | unsigned long flags; |
| 2132 | int ret; |
| 2133 | |
| 2134 | spin_lock_irqsave(&tsk->sighand->siglock, flags); |
| 2135 | ret = dequeue_signal(tsk, mask, info); |
| 2136 | spin_unlock_irqrestore(&tsk->sighand->siglock, flags); |
| 2137 | |
| 2138 | return ret; |
| 2139 | } |
| 2140 | |
| 2141 | extern void block_all_signals(int (*notifier)(void *priv), void *priv, |
| 2142 | sigset_t *mask); |
| 2143 | extern void unblock_all_signals(void); |
| 2144 | extern void release_task(struct task_struct * p); |
| 2145 | extern int send_sig_info(int, struct siginfo *, struct task_struct *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2146 | extern int force_sigsegv(int, struct task_struct *); |
| 2147 | extern int force_sig_info(int, struct siginfo *, struct task_struct *); |
Eric W. Biederman | c4b92fc | 2006-10-02 02:17:10 -0700 | [diff] [blame] | 2148 | 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] | 2149 | extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid); |
Eric W. Biederman | 2425c08 | 2006-10-02 02:17:28 -0700 | [diff] [blame] | 2150 | extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32); |
Eric W. Biederman | c4b92fc | 2006-10-02 02:17:10 -0700 | [diff] [blame] | 2151 | extern int kill_pgrp(struct pid *pid, int sig, int priv); |
| 2152 | extern int kill_pid(struct pid *pid, int sig, int priv); |
Matthew Wilcox | c3de4b3 | 2007-02-09 08:11:47 -0700 | [diff] [blame] | 2153 | extern int kill_proc_info(int, struct siginfo *, pid_t); |
Roland McGrath | 2b2a1ff | 2008-07-25 19:45:54 -0700 | [diff] [blame] | 2154 | extern int do_notify_parent(struct task_struct *, int); |
Oleg Nesterov | a7f0765 | 2009-09-23 15:56:44 -0700 | [diff] [blame] | 2155 | 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] | 2156 | extern void force_sig(int, struct task_struct *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2157 | extern int send_sig(int, struct task_struct *, int); |
Oleg Nesterov | 09faef1 | 2010-05-26 14:43:11 -0700 | [diff] [blame] | 2158 | extern int zap_other_threads(struct task_struct *p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2159 | extern struct sigqueue *sigqueue_alloc(void); |
| 2160 | extern void sigqueue_free(struct sigqueue *); |
Oleg Nesterov | ac5c215 | 2008-04-30 00:52:57 -0700 | [diff] [blame] | 2161 | extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group); |
Oleg Nesterov | 9ac95f2 | 2006-02-09 22:41:50 +0300 | [diff] [blame] | 2162 | extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2163 | extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); |
| 2164 | |
Cedric Le Goater | 9ec5209 | 2006-10-02 02:19:00 -0700 | [diff] [blame] | 2165 | static inline int kill_cad_pid(int sig, int priv) |
| 2166 | { |
| 2167 | return kill_pid(cad_pid, sig, priv); |
| 2168 | } |
| 2169 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2170 | /* These can be the second arg to send_sig_info/send_group_sig_info. */ |
| 2171 | #define SEND_SIG_NOINFO ((struct siginfo *) 0) |
| 2172 | #define SEND_SIG_PRIV ((struct siginfo *) 1) |
| 2173 | #define SEND_SIG_FORCED ((struct siginfo *) 2) |
| 2174 | |
Sebastian Andrzej Siewior | 2a855dd | 2009-10-25 15:37:58 +0100 | [diff] [blame] | 2175 | /* |
| 2176 | * True if we are on the alternate signal stack. |
| 2177 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2178 | static inline int on_sig_stack(unsigned long sp) |
| 2179 | { |
Sebastian Andrzej Siewior | 2a855dd | 2009-10-25 15:37:58 +0100 | [diff] [blame] | 2180 | #ifdef CONFIG_STACK_GROWSUP |
| 2181 | return sp >= current->sas_ss_sp && |
| 2182 | sp - current->sas_ss_sp < current->sas_ss_size; |
| 2183 | #else |
| 2184 | return sp > current->sas_ss_sp && |
| 2185 | sp - current->sas_ss_sp <= current->sas_ss_size; |
| 2186 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2187 | } |
| 2188 | |
| 2189 | static inline int sas_ss_flags(unsigned long sp) |
| 2190 | { |
| 2191 | return (current->sas_ss_size == 0 ? SS_DISABLE |
| 2192 | : on_sig_stack(sp) ? SS_ONSTACK : 0); |
| 2193 | } |
| 2194 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2195 | /* |
| 2196 | * Routines for handling mm_structs |
| 2197 | */ |
| 2198 | extern struct mm_struct * mm_alloc(void); |
| 2199 | |
| 2200 | /* mmdrop drops the mm and the page tables */ |
Harvey Harrison | b3c9752 | 2008-02-13 15:03:15 -0800 | [diff] [blame] | 2201 | extern void __mmdrop(struct mm_struct *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2202 | static inline void mmdrop(struct mm_struct * mm) |
| 2203 | { |
Ingo Molnar | 6fb43d7 | 2007-07-09 18:52:01 +0200 | [diff] [blame] | 2204 | if (unlikely(atomic_dec_and_test(&mm->mm_count))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2205 | __mmdrop(mm); |
| 2206 | } |
| 2207 | |
| 2208 | /* mmput gets rid of the mappings and all user-space */ |
| 2209 | extern void mmput(struct mm_struct *); |
| 2210 | /* Grab a reference to a task's mm, if it is not already going away */ |
| 2211 | extern struct mm_struct *get_task_mm(struct task_struct *task); |
| 2212 | /* Remove the current tasks stale references to the old mm_struct */ |
| 2213 | extern void mm_release(struct task_struct *, struct mm_struct *); |
Carsten Otte | 402b086 | 2008-03-25 18:47:10 +0100 | [diff] [blame] | 2214 | /* Allocate a new mm structure and copy contents from tsk->mm */ |
| 2215 | extern struct mm_struct *dup_mm(struct task_struct *tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2216 | |
Alexey Dobriyan | 6f2c55b | 2009-04-02 16:56:59 -0700 | [diff] [blame] | 2217 | extern int copy_thread(unsigned long, unsigned long, unsigned long, |
| 2218 | struct task_struct *, struct pt_regs *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2219 | extern void flush_thread(void); |
| 2220 | extern void exit_thread(void); |
| 2221 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2222 | extern void exit_files(struct task_struct *); |
Oleg Nesterov | a7e5328 | 2006-03-28 16:11:27 -0800 | [diff] [blame] | 2223 | extern void __cleanup_sighand(struct sighand_struct *); |
Oleg Nesterov | cbaffba | 2008-05-26 20:55:42 +0400 | [diff] [blame] | 2224 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2225 | extern void exit_itimers(struct signal_struct *); |
Oleg Nesterov | cbaffba | 2008-05-26 20:55:42 +0400 | [diff] [blame] | 2226 | extern void flush_itimer_signals(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2227 | |
| 2228 | extern NORET_TYPE void do_group_exit(int); |
| 2229 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2230 | extern void daemonize(const char *, ...); |
| 2231 | extern int allow_signal(int); |
| 2232 | extern int disallow_signal(int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2233 | |
David Howells | d762746 | 2010-08-17 23:52:56 +0100 | [diff] [blame] | 2234 | extern int do_execve(const char *, |
| 2235 | const char __user * const __user *, |
| 2236 | const char __user * const __user *, struct pt_regs *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2237 | 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] | 2238 | struct task_struct *fork_idle(int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2239 | |
| 2240 | extern void set_task_comm(struct task_struct *tsk, char *from); |
Andrew Morton | 59714d6 | 2008-02-04 22:27:21 -0800 | [diff] [blame] | 2241 | extern char *get_task_comm(char *to, struct task_struct *tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2242 | |
| 2243 | #ifdef CONFIG_SMP |
Peter Zijlstra | 317f394 | 2011-04-05 17:23:58 +0200 | [diff] [blame] | 2244 | void scheduler_ipi(void); |
Roland McGrath | 85ba2d8 | 2008-07-25 19:45:58 -0700 | [diff] [blame] | 2245 | extern unsigned long wait_task_inactive(struct task_struct *, long match_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2246 | #else |
Peter Zijlstra | 184748c | 2011-04-05 17:23:39 +0200 | [diff] [blame] | 2247 | static inline void scheduler_ipi(void) { } |
Roland McGrath | 85ba2d8 | 2008-07-25 19:45:58 -0700 | [diff] [blame] | 2248 | static inline unsigned long wait_task_inactive(struct task_struct *p, |
| 2249 | long match_state) |
| 2250 | { |
| 2251 | return 1; |
| 2252 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2253 | #endif |
| 2254 | |
Jiri Pirko | 05725f7 | 2009-04-14 20:17:16 +0200 | [diff] [blame] | 2255 | #define next_task(p) \ |
| 2256 | list_entry_rcu((p)->tasks.next, struct task_struct, tasks) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2257 | |
| 2258 | #define for_each_process(p) \ |
| 2259 | for (p = &init_task ; (p = next_task(p)) != &init_task ; ) |
| 2260 | |
Oleg Nesterov | 5bb459b | 2009-07-10 03:48:23 +0200 | [diff] [blame] | 2261 | extern bool current_is_single_threaded(void); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 2262 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2263 | /* |
| 2264 | * Careful: do_each_thread/while_each_thread is a double loop so |
| 2265 | * 'break' will not work as expected - use goto instead. |
| 2266 | */ |
| 2267 | #define do_each_thread(g, t) \ |
| 2268 | for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do |
| 2269 | |
| 2270 | #define while_each_thread(g, t) \ |
| 2271 | while ((t = next_thread(t)) != g) |
| 2272 | |
Oleg Nesterov | 7e49827 | 2010-05-26 14:43:22 -0700 | [diff] [blame] | 2273 | static inline int get_nr_threads(struct task_struct *tsk) |
| 2274 | { |
Oleg Nesterov | b3ac022 | 2010-05-26 14:43:24 -0700 | [diff] [blame] | 2275 | return tsk->signal->nr_threads; |
Oleg Nesterov | 7e49827 | 2010-05-26 14:43:22 -0700 | [diff] [blame] | 2276 | } |
| 2277 | |
Eric W. Biederman | de12a78 | 2006-04-10 17:16:49 -0600 | [diff] [blame] | 2278 | /* de_thread depends on thread_group_leader not being a pid based check */ |
| 2279 | #define thread_group_leader(p) (p == p->group_leader) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2280 | |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 2281 | /* Do to the insanities of de_thread it is possible for a process |
| 2282 | * to have the pid of the thread group leader without actually being |
| 2283 | * the thread group leader. For iteration through the pids in proc |
| 2284 | * all we care about is that we have a task with the appropriate |
| 2285 | * pid, we don't actually care if we have the right task. |
| 2286 | */ |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 2287 | static inline int has_group_leader_pid(struct task_struct *p) |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 2288 | { |
| 2289 | return p->pid == p->tgid; |
| 2290 | } |
| 2291 | |
Pavel Emelyanov | bac0abd | 2007-10-18 23:40:18 -0700 | [diff] [blame] | 2292 | static inline |
| 2293 | int same_thread_group(struct task_struct *p1, struct task_struct *p2) |
| 2294 | { |
| 2295 | return p1->tgid == p2->tgid; |
| 2296 | } |
| 2297 | |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 2298 | static inline struct task_struct *next_thread(const struct task_struct *p) |
Oleg Nesterov | 47e6532 | 2006-03-28 16:11:25 -0800 | [diff] [blame] | 2299 | { |
Jiri Pirko | 05725f7 | 2009-04-14 20:17:16 +0200 | [diff] [blame] | 2300 | return list_entry_rcu(p->thread_group.next, |
| 2301 | struct task_struct, thread_group); |
Oleg Nesterov | 47e6532 | 2006-03-28 16:11:25 -0800 | [diff] [blame] | 2302 | } |
| 2303 | |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 2304 | static inline int thread_group_empty(struct task_struct *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2305 | { |
Oleg Nesterov | 47e6532 | 2006-03-28 16:11:25 -0800 | [diff] [blame] | 2306 | return list_empty(&p->thread_group); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2307 | } |
| 2308 | |
| 2309 | #define delay_group_leader(p) \ |
| 2310 | (thread_group_leader(p) && !thread_group_empty(p)) |
| 2311 | |
Oleg Nesterov | 39c626a | 2009-04-02 16:58:18 -0700 | [diff] [blame] | 2312 | static inline int task_detached(struct task_struct *p) |
| 2313 | { |
| 2314 | return p->exit_signal == -1; |
| 2315 | } |
| 2316 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2317 | /* |
Eric W. Biederman | 260ea10 | 2006-06-23 02:05:18 -0700 | [diff] [blame] | 2318 | * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 2319 | * subscriptions and synchronises with wait4(). Also used in procfs. Also |
Paul Menage | ddbcc7e | 2007-10-18 23:39:30 -0700 | [diff] [blame] | 2320 | * pins the final release of task.io_context. Also protects ->cpuset and |
| 2321 | * ->cgroup.subsys[]. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2322 | * |
| 2323 | * Nests both inside and outside of read_lock(&tasklist_lock). |
| 2324 | * It must not be nested with write_lock_irq(&tasklist_lock), |
| 2325 | * neither inside nor outside. |
| 2326 | */ |
| 2327 | static inline void task_lock(struct task_struct *p) |
| 2328 | { |
| 2329 | spin_lock(&p->alloc_lock); |
| 2330 | } |
| 2331 | |
| 2332 | static inline void task_unlock(struct task_struct *p) |
| 2333 | { |
| 2334 | spin_unlock(&p->alloc_lock); |
| 2335 | } |
| 2336 | |
Namhyung Kim | b8ed374 | 2010-10-27 15:34:06 -0700 | [diff] [blame] | 2337 | extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk, |
Oleg Nesterov | f63ee72 | 2006-03-28 16:11:13 -0800 | [diff] [blame] | 2338 | unsigned long *flags); |
| 2339 | |
Namhyung Kim | b8ed374 | 2010-10-27 15:34:06 -0700 | [diff] [blame] | 2340 | #define lock_task_sighand(tsk, flags) \ |
| 2341 | ({ struct sighand_struct *__ss; \ |
| 2342 | __cond_lock(&(tsk)->sighand->siglock, \ |
| 2343 | (__ss = __lock_task_sighand(tsk, flags))); \ |
| 2344 | __ss; \ |
| 2345 | }) \ |
| 2346 | |
Oleg Nesterov | f63ee72 | 2006-03-28 16:11:13 -0800 | [diff] [blame] | 2347 | static inline void unlock_task_sighand(struct task_struct *tsk, |
| 2348 | unsigned long *flags) |
| 2349 | { |
| 2350 | spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); |
| 2351 | } |
| 2352 | |
Ben Blum | 4714d1d | 2011-05-26 16:25:18 -0700 | [diff] [blame] | 2353 | /* See the declaration of threadgroup_fork_lock in signal_struct. */ |
| 2354 | #ifdef CONFIG_CGROUPS |
| 2355 | static inline void threadgroup_fork_read_lock(struct task_struct *tsk) |
| 2356 | { |
| 2357 | down_read(&tsk->signal->threadgroup_fork_lock); |
| 2358 | } |
| 2359 | static inline void threadgroup_fork_read_unlock(struct task_struct *tsk) |
| 2360 | { |
| 2361 | up_read(&tsk->signal->threadgroup_fork_lock); |
| 2362 | } |
| 2363 | static inline void threadgroup_fork_write_lock(struct task_struct *tsk) |
| 2364 | { |
| 2365 | down_write(&tsk->signal->threadgroup_fork_lock); |
| 2366 | } |
| 2367 | static inline void threadgroup_fork_write_unlock(struct task_struct *tsk) |
| 2368 | { |
| 2369 | up_write(&tsk->signal->threadgroup_fork_lock); |
| 2370 | } |
| 2371 | #else |
| 2372 | static inline void threadgroup_fork_read_lock(struct task_struct *tsk) {} |
| 2373 | static inline void threadgroup_fork_read_unlock(struct task_struct *tsk) {} |
| 2374 | static inline void threadgroup_fork_write_lock(struct task_struct *tsk) {} |
| 2375 | static inline void threadgroup_fork_write_unlock(struct task_struct *tsk) {} |
| 2376 | #endif |
| 2377 | |
Al Viro | f037360 | 2005-11-13 16:06:57 -0800 | [diff] [blame] | 2378 | #ifndef __HAVE_THREAD_FUNCTIONS |
| 2379 | |
Roman Zippel | f7e4217 | 2007-05-09 02:35:17 -0700 | [diff] [blame] | 2380 | #define task_thread_info(task) ((struct thread_info *)(task)->stack) |
| 2381 | #define task_stack_page(task) ((task)->stack) |
Al Viro | a1261f5 | 2005-11-13 16:06:55 -0800 | [diff] [blame] | 2382 | |
Al Viro | 10ebffd | 2005-11-13 16:06:56 -0800 | [diff] [blame] | 2383 | static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) |
| 2384 | { |
| 2385 | *task_thread_info(p) = *task_thread_info(org); |
| 2386 | task_thread_info(p)->task = p; |
| 2387 | } |
| 2388 | |
| 2389 | static inline unsigned long *end_of_stack(struct task_struct *p) |
| 2390 | { |
Roman Zippel | f7e4217 | 2007-05-09 02:35:17 -0700 | [diff] [blame] | 2391 | return (unsigned long *)(task_thread_info(p) + 1); |
Al Viro | 10ebffd | 2005-11-13 16:06:56 -0800 | [diff] [blame] | 2392 | } |
| 2393 | |
Al Viro | f037360 | 2005-11-13 16:06:57 -0800 | [diff] [blame] | 2394 | #endif |
| 2395 | |
FUJITA Tomonori | 8b05c7e | 2008-07-23 21:26:53 -0700 | [diff] [blame] | 2396 | static inline int object_is_on_stack(void *obj) |
| 2397 | { |
| 2398 | void *stack = task_stack_page(current); |
| 2399 | |
| 2400 | return (obj >= stack) && (obj < (stack + THREAD_SIZE)); |
| 2401 | } |
| 2402 | |
Benjamin Herrenschmidt | 8c9843e | 2008-04-18 16:56:15 +1000 | [diff] [blame] | 2403 | extern void thread_info_cache_init(void); |
| 2404 | |
Eric Sandeen | 7c9f886 | 2008-04-22 16:38:23 -0500 | [diff] [blame] | 2405 | #ifdef CONFIG_DEBUG_STACK_USAGE |
| 2406 | static inline unsigned long stack_not_used(struct task_struct *p) |
| 2407 | { |
| 2408 | unsigned long *n = end_of_stack(p); |
| 2409 | |
| 2410 | do { /* Skip over canary */ |
| 2411 | n++; |
| 2412 | } while (!*n); |
| 2413 | |
| 2414 | return (unsigned long)n - (unsigned long)end_of_stack(p); |
| 2415 | } |
| 2416 | #endif |
| 2417 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2418 | /* set thread flags in other task's structures |
| 2419 | * - see asm/thread_info.h for TIF_xxxx flags available |
| 2420 | */ |
| 2421 | static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) |
| 2422 | { |
Al Viro | a1261f5 | 2005-11-13 16:06:55 -0800 | [diff] [blame] | 2423 | set_ti_thread_flag(task_thread_info(tsk), flag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2424 | } |
| 2425 | |
| 2426 | static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) |
| 2427 | { |
Al Viro | a1261f5 | 2005-11-13 16:06:55 -0800 | [diff] [blame] | 2428 | clear_ti_thread_flag(task_thread_info(tsk), flag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2429 | } |
| 2430 | |
| 2431 | static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) |
| 2432 | { |
Al Viro | a1261f5 | 2005-11-13 16:06:55 -0800 | [diff] [blame] | 2433 | return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2434 | } |
| 2435 | |
| 2436 | static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) |
| 2437 | { |
Al Viro | a1261f5 | 2005-11-13 16:06:55 -0800 | [diff] [blame] | 2438 | return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2439 | } |
| 2440 | |
| 2441 | static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) |
| 2442 | { |
Al Viro | a1261f5 | 2005-11-13 16:06:55 -0800 | [diff] [blame] | 2443 | return test_ti_thread_flag(task_thread_info(tsk), flag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2444 | } |
| 2445 | |
| 2446 | static inline void set_tsk_need_resched(struct task_struct *tsk) |
| 2447 | { |
| 2448 | set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); |
| 2449 | } |
| 2450 | |
| 2451 | static inline void clear_tsk_need_resched(struct task_struct *tsk) |
| 2452 | { |
| 2453 | clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); |
| 2454 | } |
| 2455 | |
Gregory Haskins | 8ae121a | 2008-04-23 07:13:29 -0400 | [diff] [blame] | 2456 | static inline int test_tsk_need_resched(struct task_struct *tsk) |
| 2457 | { |
| 2458 | return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); |
| 2459 | } |
| 2460 | |
Eric W. Biederman | 690cc3f | 2009-05-13 16:55:10 +0000 | [diff] [blame] | 2461 | static inline int restart_syscall(void) |
| 2462 | { |
| 2463 | set_tsk_thread_flag(current, TIF_SIGPENDING); |
| 2464 | return -ERESTARTNOINTR; |
| 2465 | } |
| 2466 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2467 | static inline int signal_pending(struct task_struct *p) |
| 2468 | { |
| 2469 | return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); |
| 2470 | } |
Matthew Wilcox | f776d12 | 2007-12-06 11:15:50 -0500 | [diff] [blame] | 2471 | |
Roland McGrath | d958872 | 2009-09-23 15:57:04 -0700 | [diff] [blame] | 2472 | static inline int __fatal_signal_pending(struct task_struct *p) |
| 2473 | { |
| 2474 | return unlikely(sigismember(&p->pending.signal, SIGKILL)); |
| 2475 | } |
Matthew Wilcox | f776d12 | 2007-12-06 11:15:50 -0500 | [diff] [blame] | 2476 | |
| 2477 | static inline int fatal_signal_pending(struct task_struct *p) |
| 2478 | { |
| 2479 | return signal_pending(p) && __fatal_signal_pending(p); |
| 2480 | } |
| 2481 | |
Oleg Nesterov | 16882c1 | 2008-06-08 21:20:41 +0400 | [diff] [blame] | 2482 | static inline int signal_pending_state(long state, struct task_struct *p) |
| 2483 | { |
| 2484 | if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL))) |
| 2485 | return 0; |
| 2486 | if (!signal_pending(p)) |
| 2487 | return 0; |
| 2488 | |
Oleg Nesterov | 16882c1 | 2008-06-08 21:20:41 +0400 | [diff] [blame] | 2489 | return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p); |
| 2490 | } |
| 2491 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2492 | static inline int need_resched(void) |
| 2493 | { |
Linus Torvalds | 9404ef0 | 2008-05-12 10:14:22 -0700 | [diff] [blame] | 2494 | return unlikely(test_thread_flag(TIF_NEED_RESCHED)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2495 | } |
| 2496 | |
| 2497 | /* |
| 2498 | * cond_resched() and cond_resched_lock(): latency reduction via |
| 2499 | * explicit rescheduling in places that are safe. The return |
| 2500 | * value indicates whether a reschedule was done in fact. |
| 2501 | * cond_resched_lock() will drop the spinlock before scheduling, |
| 2502 | * cond_resched_softirq() will enable bhs before scheduling. |
| 2503 | */ |
Linus Torvalds | c3921ab | 2008-05-11 16:04:48 -0700 | [diff] [blame] | 2504 | extern int _cond_resched(void); |
Frederic Weisbecker | 6f80bd9 | 2009-07-16 15:44:29 +0200 | [diff] [blame] | 2505 | |
Frederic Weisbecker | 613afbf | 2009-07-16 15:44:29 +0200 | [diff] [blame] | 2506 | #define cond_resched() ({ \ |
| 2507 | __might_sleep(__FILE__, __LINE__, 0); \ |
| 2508 | _cond_resched(); \ |
| 2509 | }) |
Frederic Weisbecker | 6f80bd9 | 2009-07-16 15:44:29 +0200 | [diff] [blame] | 2510 | |
Frederic Weisbecker | 613afbf | 2009-07-16 15:44:29 +0200 | [diff] [blame] | 2511 | extern int __cond_resched_lock(spinlock_t *lock); |
| 2512 | |
Frederic Weisbecker | 716a423 | 2009-07-24 20:05:23 +0200 | [diff] [blame] | 2513 | #ifdef CONFIG_PREEMPT |
| 2514 | #define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET |
Herbert Xu | 02b67cc3 | 2008-01-25 21:08:28 +0100 | [diff] [blame] | 2515 | #else |
Frederic Weisbecker | 716a423 | 2009-07-24 20:05:23 +0200 | [diff] [blame] | 2516 | #define PREEMPT_LOCK_OFFSET 0 |
Herbert Xu | 02b67cc3 | 2008-01-25 21:08:28 +0100 | [diff] [blame] | 2517 | #endif |
Frederic Weisbecker | 716a423 | 2009-07-24 20:05:23 +0200 | [diff] [blame] | 2518 | |
Frederic Weisbecker | 613afbf | 2009-07-16 15:44:29 +0200 | [diff] [blame] | 2519 | #define cond_resched_lock(lock) ({ \ |
Frederic Weisbecker | 716a423 | 2009-07-24 20:05:23 +0200 | [diff] [blame] | 2520 | __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \ |
Frederic Weisbecker | 613afbf | 2009-07-16 15:44:29 +0200 | [diff] [blame] | 2521 | __cond_resched_lock(lock); \ |
| 2522 | }) |
| 2523 | |
| 2524 | extern int __cond_resched_softirq(void); |
| 2525 | |
Venkatesh Pallipadi | 75e1056 | 2010-10-04 17:03:16 -0700 | [diff] [blame] | 2526 | #define cond_resched_softirq() ({ \ |
| 2527 | __might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \ |
| 2528 | __cond_resched_softirq(); \ |
Frederic Weisbecker | 613afbf | 2009-07-16 15:44:29 +0200 | [diff] [blame] | 2529 | }) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2530 | |
| 2531 | /* |
| 2532 | * Does a critical section need to be broken due to another |
Nick Piggin | 95c354f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 2533 | * task waiting?: (technically does not depend on CONFIG_PREEMPT, |
| 2534 | * but a general need for low latency) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2535 | */ |
Nick Piggin | 95c354f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 2536 | static inline int spin_needbreak(spinlock_t *lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2537 | { |
Nick Piggin | 95c354f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 2538 | #ifdef CONFIG_PREEMPT |
| 2539 | return spin_is_contended(lock); |
| 2540 | #else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2541 | return 0; |
Nick Piggin | 95c354f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 2542 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2543 | } |
| 2544 | |
Roland McGrath | 7bb44ad | 2007-05-23 13:57:44 -0700 | [diff] [blame] | 2545 | /* |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 2546 | * Thread group CPU time accounting. |
| 2547 | */ |
Peter Zijlstra | 4cd4c1b | 2009-02-05 12:24:16 +0100 | [diff] [blame] | 2548 | void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times); |
Peter Zijlstra | 4da94d49 | 2009-02-11 11:30:27 +0100 | [diff] [blame] | 2549 | void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times); |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 2550 | |
| 2551 | static inline void thread_group_cputime_init(struct signal_struct *sig) |
| 2552 | { |
Peter Zijlstra | 4cd4c1b | 2009-02-05 12:24:16 +0100 | [diff] [blame] | 2553 | spin_lock_init(&sig->cputimer.lock); |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 2554 | } |
| 2555 | |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 2556 | /* |
Roland McGrath | 7bb44ad | 2007-05-23 13:57:44 -0700 | [diff] [blame] | 2557 | * Reevaluate whether the task has signals pending delivery. |
| 2558 | * Wake the task if so. |
| 2559 | * This is required every time the blocked sigset_t changes. |
| 2560 | * callers must hold sighand->siglock. |
| 2561 | */ |
| 2562 | extern void recalc_sigpending_and_wake(struct task_struct *t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2563 | extern void recalc_sigpending(void); |
| 2564 | |
| 2565 | extern void signal_wake_up(struct task_struct *t, int resume_stopped); |
| 2566 | |
| 2567 | /* |
| 2568 | * Wrappers for p->thread_info->cpu access. No-op on UP. |
| 2569 | */ |
| 2570 | #ifdef CONFIG_SMP |
| 2571 | |
| 2572 | static inline unsigned int task_cpu(const struct task_struct *p) |
| 2573 | { |
Al Viro | a1261f5 | 2005-11-13 16:06:55 -0800 | [diff] [blame] | 2574 | return task_thread_info(p)->cpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2575 | } |
| 2576 | |
Ingo Molnar | c65cc87 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 2577 | extern void set_task_cpu(struct task_struct *p, unsigned int cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2578 | |
| 2579 | #else |
| 2580 | |
| 2581 | static inline unsigned int task_cpu(const struct task_struct *p) |
| 2582 | { |
| 2583 | return 0; |
| 2584 | } |
| 2585 | |
| 2586 | static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) |
| 2587 | { |
| 2588 | } |
| 2589 | |
| 2590 | #endif /* CONFIG_SMP */ |
| 2591 | |
Rusty Russell | 96f874e | 2008-11-25 02:35:14 +1030 | [diff] [blame] | 2592 | extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); |
| 2593 | extern long sched_getaffinity(pid_t pid, struct cpumask *mask); |
Siddha, Suresh B | 5c45bf2 | 2006-06-27 02:54:42 -0700 | [diff] [blame] | 2594 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2595 | extern void normalize_rt_tasks(void); |
| 2596 | |
Dhaval Giani | 7c94143 | 2010-01-20 13:26:18 +0100 | [diff] [blame] | 2597 | #ifdef CONFIG_CGROUP_SCHED |
Srivatsa Vaddagiri | 9b5b775 | 2007-10-15 17:00:09 +0200 | [diff] [blame] | 2598 | |
Yong Zhang | 07e06b0 | 2011-01-07 15:17:36 +0800 | [diff] [blame] | 2599 | extern struct task_group root_task_group; |
Srivatsa Vaddagiri | 9b5b775 | 2007-10-15 17:00:09 +0200 | [diff] [blame] | 2600 | |
Dhaval Giani | ec7dc8a | 2008-04-19 19:44:59 +0200 | [diff] [blame] | 2601 | extern struct task_group *sched_create_group(struct task_group *parent); |
Ingo Molnar | 4cf86d7 | 2007-10-15 17:00:14 +0200 | [diff] [blame] | 2602 | extern void sched_destroy_group(struct task_group *tg); |
Srivatsa Vaddagiri | 9b5b775 | 2007-10-15 17:00:09 +0200 | [diff] [blame] | 2603 | extern void sched_move_task(struct task_struct *tsk); |
Peter Zijlstra | 052f1dc | 2008-02-13 15:45:40 +0100 | [diff] [blame] | 2604 | #ifdef CONFIG_FAIR_GROUP_SCHED |
Ingo Molnar | 4cf86d7 | 2007-10-15 17:00:14 +0200 | [diff] [blame] | 2605 | 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] | 2606 | extern unsigned long sched_group_shares(struct task_group *tg); |
Peter Zijlstra | 052f1dc | 2008-02-13 15:45:40 +0100 | [diff] [blame] | 2607 | #endif |
| 2608 | #ifdef CONFIG_RT_GROUP_SCHED |
Peter Zijlstra | 9f0c1e5 | 2008-02-13 15:45:39 +0100 | [diff] [blame] | 2609 | extern int sched_group_set_rt_runtime(struct task_group *tg, |
| 2610 | long rt_runtime_us); |
| 2611 | extern long sched_group_rt_runtime(struct task_group *tg); |
Peter Zijlstra | d0b27fa | 2008-04-19 19:44:57 +0200 | [diff] [blame] | 2612 | extern int sched_group_set_rt_period(struct task_group *tg, |
| 2613 | long rt_period_us); |
| 2614 | extern long sched_group_rt_period(struct task_group *tg); |
Dhaval Giani | 54e9912 | 2009-02-27 15:13:54 +0530 | [diff] [blame] | 2615 | 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] | 2616 | #endif |
Srivatsa Vaddagiri | 9b5b775 | 2007-10-15 17:00:09 +0200 | [diff] [blame] | 2617 | #endif |
| 2618 | |
Dhaval Giani | 54e9912 | 2009-02-27 15:13:54 +0530 | [diff] [blame] | 2619 | extern int task_can_switch_user(struct user_struct *up, |
| 2620 | struct task_struct *tsk); |
| 2621 | |
Alexey Dobriyan | 4b98d11 | 2007-02-10 01:46:45 -0800 | [diff] [blame] | 2622 | #ifdef CONFIG_TASK_XACCT |
| 2623 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) |
| 2624 | { |
Andrea Righi | 940389b | 2008-07-28 00:48:12 +0200 | [diff] [blame] | 2625 | tsk->ioac.rchar += amt; |
Alexey Dobriyan | 4b98d11 | 2007-02-10 01:46:45 -0800 | [diff] [blame] | 2626 | } |
| 2627 | |
| 2628 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) |
| 2629 | { |
Andrea Righi | 940389b | 2008-07-28 00:48:12 +0200 | [diff] [blame] | 2630 | tsk->ioac.wchar += amt; |
Alexey Dobriyan | 4b98d11 | 2007-02-10 01:46:45 -0800 | [diff] [blame] | 2631 | } |
| 2632 | |
| 2633 | static inline void inc_syscr(struct task_struct *tsk) |
| 2634 | { |
Andrea Righi | 940389b | 2008-07-28 00:48:12 +0200 | [diff] [blame] | 2635 | tsk->ioac.syscr++; |
Alexey Dobriyan | 4b98d11 | 2007-02-10 01:46:45 -0800 | [diff] [blame] | 2636 | } |
| 2637 | |
| 2638 | static inline void inc_syscw(struct task_struct *tsk) |
| 2639 | { |
Andrea Righi | 940389b | 2008-07-28 00:48:12 +0200 | [diff] [blame] | 2640 | tsk->ioac.syscw++; |
Alexey Dobriyan | 4b98d11 | 2007-02-10 01:46:45 -0800 | [diff] [blame] | 2641 | } |
| 2642 | #else |
| 2643 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) |
| 2644 | { |
| 2645 | } |
| 2646 | |
| 2647 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) |
| 2648 | { |
| 2649 | } |
| 2650 | |
| 2651 | static inline void inc_syscr(struct task_struct *tsk) |
| 2652 | { |
| 2653 | } |
| 2654 | |
| 2655 | static inline void inc_syscw(struct task_struct *tsk) |
| 2656 | { |
| 2657 | } |
| 2658 | #endif |
| 2659 | |
Dave Hansen | 8245525 | 2008-02-04 22:28:59 -0800 | [diff] [blame] | 2660 | #ifndef TASK_SIZE_OF |
| 2661 | #define TASK_SIZE_OF(tsk) TASK_SIZE |
| 2662 | #endif |
| 2663 | |
Balbir Singh | cf475ad | 2008-04-29 01:00:16 -0700 | [diff] [blame] | 2664 | #ifdef CONFIG_MM_OWNER |
| 2665 | extern void mm_update_next_owner(struct mm_struct *mm); |
| 2666 | extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p); |
| 2667 | #else |
| 2668 | static inline void mm_update_next_owner(struct mm_struct *mm) |
| 2669 | { |
| 2670 | } |
| 2671 | |
| 2672 | static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p) |
| 2673 | { |
| 2674 | } |
| 2675 | #endif /* CONFIG_MM_OWNER */ |
| 2676 | |
Jiri Slaby | 3e10e71 | 2009-11-19 17:16:37 +0100 | [diff] [blame] | 2677 | static inline unsigned long task_rlimit(const struct task_struct *tsk, |
| 2678 | unsigned int limit) |
| 2679 | { |
| 2680 | return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur); |
| 2681 | } |
| 2682 | |
| 2683 | static inline unsigned long task_rlimit_max(const struct task_struct *tsk, |
| 2684 | unsigned int limit) |
| 2685 | { |
| 2686 | return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max); |
| 2687 | } |
| 2688 | |
| 2689 | static inline unsigned long rlimit(unsigned int limit) |
| 2690 | { |
| 2691 | return task_rlimit(current, limit); |
| 2692 | } |
| 2693 | |
| 2694 | static inline unsigned long rlimit_max(unsigned int limit) |
| 2695 | { |
| 2696 | return task_rlimit_max(current, limit); |
| 2697 | } |
| 2698 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2699 | #endif /* __KERNEL__ */ |
| 2700 | |
| 2701 | #endif |