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 */ |
| 24 | #define CLONE_STOPPED 0x02000000 /* Start in stopped state */ |
Serge E. Hallyn | 071df10 | 2006-10-02 02:18:17 -0700 | [diff] [blame] | 25 | #define CLONE_NEWUTS 0x04000000 /* New utsname group? */ |
Kirill Korotaev | 25b21cb | 2006-10-02 02:18:19 -0700 | [diff] [blame] | 26 | #define CLONE_NEWIPC 0x08000000 /* New ipcs */ |
Serge E. Hallyn | 77ec739 | 2007-07-15 23:41:01 -0700 | [diff] [blame] | 27 | #define CLONE_NEWUSER 0x10000000 /* New user namespace */ |
Pavel Emelyanov | 30e49c2 | 2007-10-18 23:40:10 -0700 | [diff] [blame] | 28 | #define CLONE_NEWPID 0x20000000 /* New pid namespace */ |
Eric W. Biederman | 169e367 | 2007-09-27 17:10:06 -0700 | [diff] [blame] | 29 | #define CLONE_NEWNET 0x40000000 /* New network namespace */ |
Jens Axboe | fadad878 | 2008-01-24 08:54:47 +0100 | [diff] [blame] | 30 | #define CLONE_IO 0x80000000 /* Clone io context */ |
David Woodhouse | b7b3c76 | 2006-04-27 00:12:56 +0100 | [diff] [blame] | 31 | |
| 32 | /* |
| 33 | * Scheduling policies |
| 34 | */ |
| 35 | #define SCHED_NORMAL 0 |
| 36 | #define SCHED_FIFO 1 |
| 37 | #define SCHED_RR 2 |
| 38 | #define SCHED_BATCH 3 |
Ingo Molnar | 0e6aca4 | 2007-07-09 18:51:57 +0200 | [diff] [blame] | 39 | /* SCHED_ISO: reserved but not implemented yet */ |
| 40 | #define SCHED_IDLE 5 |
David Woodhouse | b7b3c76 | 2006-04-27 00:12:56 +0100 | [diff] [blame] | 41 | |
David Woodhouse | a3b6714 | 2006-04-25 14:54:40 +0100 | [diff] [blame] | 42 | #ifdef __KERNEL__ |
David Woodhouse | b7b3c76 | 2006-04-27 00:12:56 +0100 | [diff] [blame] | 43 | |
| 44 | struct sched_param { |
| 45 | int sched_priority; |
| 46 | }; |
| 47 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | #include <asm/param.h> /* for HZ */ |
| 49 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | #include <linux/capability.h> |
| 51 | #include <linux/threads.h> |
| 52 | #include <linux/kernel.h> |
| 53 | #include <linux/types.h> |
| 54 | #include <linux/timex.h> |
| 55 | #include <linux/jiffies.h> |
| 56 | #include <linux/rbtree.h> |
| 57 | #include <linux/thread_info.h> |
| 58 | #include <linux/cpumask.h> |
| 59 | #include <linux/errno.h> |
| 60 | #include <linux/nodemask.h> |
Martin Schwidefsky | c92ff1b | 2007-10-16 01:24:43 -0700 | [diff] [blame] | 61 | #include <linux/mm_types.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | |
| 63 | #include <asm/system.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | #include <asm/page.h> |
| 65 | #include <asm/ptrace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | #include <asm/cputime.h> |
| 67 | |
| 68 | #include <linux/smp.h> |
| 69 | #include <linux/sem.h> |
| 70 | #include <linux/signal.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | #include <linux/fs_struct.h> |
| 72 | #include <linux/compiler.h> |
| 73 | #include <linux/completion.h> |
| 74 | #include <linux/pid.h> |
| 75 | #include <linux/percpu.h> |
| 76 | #include <linux/topology.h> |
Peter Zijlstra | 3e26c14 | 2007-10-16 23:25:50 -0700 | [diff] [blame] | 77 | #include <linux/proportions.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | #include <linux/seccomp.h> |
Ingo Molnar | e56d090 | 2006-01-08 01:01:37 -0800 | [diff] [blame] | 79 | #include <linux/rcupdate.h> |
Ingo Molnar | 23f78d4a | 2006-06-27 02:54:53 -0700 | [diff] [blame] | 80 | #include <linux/rtmutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | |
David Woodhouse | a3b6714 | 2006-04-25 14:54:40 +0100 | [diff] [blame] | 82 | #include <linux/time.h> |
| 83 | #include <linux/param.h> |
| 84 | #include <linux/resource.h> |
| 85 | #include <linux/timer.h> |
| 86 | #include <linux/hrtimer.h> |
Andrew Morton | 7c3ab73 | 2006-12-10 02:19:19 -0800 | [diff] [blame] | 87 | #include <linux/task_io_accounting.h> |
Dhaval Giani | 5cb350b | 2007-10-15 17:00:14 +0200 | [diff] [blame] | 88 | #include <linux/kobject.h> |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 89 | #include <linux/latencytop.h> |
David Woodhouse | a3b6714 | 2006-04-25 14:54:40 +0100 | [diff] [blame] | 90 | |
| 91 | #include <asm/processor.h> |
H. J. Lu | 36d57ac | 2005-09-06 15:16:49 -0700 | [diff] [blame] | 92 | |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 93 | struct mem_cgroup; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | struct exec_domain; |
Ingo Molnar | c87e283 | 2006-06-27 02:54:58 -0700 | [diff] [blame] | 95 | struct futex_pi_state; |
Alexey Dobriyan | 286100a | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 96 | struct robust_list_head; |
Neil Brown | d89d879 | 2007-05-01 09:53:42 +0200 | [diff] [blame] | 97 | struct bio; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | |
| 99 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | * List of flags we want to share for kernel threads, |
| 101 | * if only because they are not used by them anyway. |
| 102 | */ |
| 103 | #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND) |
| 104 | |
| 105 | /* |
| 106 | * These are the constant used to fake the fixed-point load-average |
| 107 | * counting. Some notes: |
| 108 | * - 11 bit fractions expand to 22 bits by the multiplies: this gives |
| 109 | * a load-average precision of 10 bits integer + 11 bits fractional |
| 110 | * - if you want to count load-averages more often, you need more |
| 111 | * precision, or rounding will get you. With 2-second counting freq, |
| 112 | * the EXP_n values would be 1981, 2034 and 2043 if still using only |
| 113 | * 11 bit fractions. |
| 114 | */ |
| 115 | extern unsigned long avenrun[]; /* Load averages */ |
| 116 | |
| 117 | #define FSHIFT 11 /* nr of bits of precision */ |
| 118 | #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ |
Linus Torvalds | 0c2043a | 2007-10-07 16:17:38 -0700 | [diff] [blame] | 119 | #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ |
| 121 | #define EXP_5 2014 /* 1/exp(5sec/5min) */ |
| 122 | #define EXP_15 2037 /* 1/exp(5sec/15min) */ |
| 123 | |
| 124 | #define CALC_LOAD(load,exp,n) \ |
| 125 | load *= exp; \ |
| 126 | load += n*(FIXED_1-exp); \ |
| 127 | load >>= FSHIFT; |
| 128 | |
| 129 | extern unsigned long total_forks; |
| 130 | extern int nr_threads; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | DECLARE_PER_CPU(unsigned long, process_counts); |
| 132 | extern int nr_processes(void); |
| 133 | extern unsigned long nr_running(void); |
| 134 | extern unsigned long nr_uninterruptible(void); |
Jack Steiner | db1b1fe | 2006-03-31 02:31:21 -0800 | [diff] [blame] | 135 | extern unsigned long nr_active(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | extern unsigned long nr_iowait(void); |
| 137 | |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 138 | struct seq_file; |
| 139 | struct cfs_rq; |
Ingo Molnar | 4cf86d7 | 2007-10-15 17:00:14 +0200 | [diff] [blame] | 140 | struct task_group; |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 141 | #ifdef CONFIG_SCHED_DEBUG |
| 142 | extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m); |
| 143 | extern void proc_sched_set_task(struct task_struct *p); |
| 144 | extern void |
Ingo Molnar | 5cef9ec | 2007-08-09 11:16:47 +0200 | [diff] [blame] | 145 | 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] | 146 | #else |
| 147 | static inline void |
| 148 | proc_sched_show_task(struct task_struct *p, struct seq_file *m) |
| 149 | { |
| 150 | } |
| 151 | static inline void proc_sched_set_task(struct task_struct *p) |
| 152 | { |
| 153 | } |
| 154 | static inline void |
Ingo Molnar | 5cef9ec | 2007-08-09 11:16:47 +0200 | [diff] [blame] | 155 | 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] | 156 | { |
| 157 | } |
| 158 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | |
Ingo Molnar | 690229a | 2008-04-23 09:31:35 +0200 | [diff] [blame] | 160 | extern unsigned long long time_sync_thresh; |
| 161 | |
Linus Torvalds | 4a8342d | 2005-09-29 15:18:21 -0700 | [diff] [blame] | 162 | /* |
| 163 | * Task state bitmask. NOTE! These bits are also |
| 164 | * encoded in fs/proc/array.c: get_task_state(). |
| 165 | * |
| 166 | * We have two separate sets of flags: task->state |
| 167 | * is about runnability, while task->exit_state are |
| 168 | * about the task exiting. Confusing, but this way |
| 169 | * modifying one set can't modify the other one by |
| 170 | * mistake. |
| 171 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | #define TASK_RUNNING 0 |
| 173 | #define TASK_INTERRUPTIBLE 1 |
| 174 | #define TASK_UNINTERRUPTIBLE 2 |
Matthew Wilcox | f021a3c | 2007-12-06 11:13:16 -0500 | [diff] [blame] | 175 | #define __TASK_STOPPED 4 |
| 176 | #define __TASK_TRACED 8 |
Linus Torvalds | 4a8342d | 2005-09-29 15:18:21 -0700 | [diff] [blame] | 177 | /* in tsk->exit_state */ |
| 178 | #define EXIT_ZOMBIE 16 |
| 179 | #define EXIT_DEAD 32 |
| 180 | /* in tsk->state again */ |
Mike Galbraith | af92723 | 2007-10-15 17:00:13 +0200 | [diff] [blame] | 181 | #define TASK_DEAD 64 |
Matthew Wilcox | f021a3c | 2007-12-06 11:13:16 -0500 | [diff] [blame] | 182 | #define TASK_WAKEKILL 128 |
| 183 | |
| 184 | /* Convenience macros for the sake of set_task_state */ |
| 185 | #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE) |
| 186 | #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED) |
| 187 | #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | |
Matthew Wilcox | 92a1f4b | 2007-12-06 10:55:25 -0500 | [diff] [blame] | 189 | /* Convenience macros for the sake of wake_up */ |
| 190 | #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) |
Matthew Wilcox | f021a3c | 2007-12-06 11:13:16 -0500 | [diff] [blame] | 191 | #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED) |
Matthew Wilcox | 92a1f4b | 2007-12-06 10:55:25 -0500 | [diff] [blame] | 192 | |
| 193 | /* get_task_state() */ |
| 194 | #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \ |
Matthew Wilcox | f021a3c | 2007-12-06 11:13:16 -0500 | [diff] [blame] | 195 | TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ |
| 196 | __TASK_TRACED) |
Matthew Wilcox | 92a1f4b | 2007-12-06 10:55:25 -0500 | [diff] [blame] | 197 | |
Matthew Wilcox | f021a3c | 2007-12-06 11:13:16 -0500 | [diff] [blame] | 198 | #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0) |
| 199 | #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0) |
Matthew Wilcox | 92a1f4b | 2007-12-06 10:55:25 -0500 | [diff] [blame] | 200 | #define task_is_stopped_or_traced(task) \ |
Matthew Wilcox | f021a3c | 2007-12-06 11:13:16 -0500 | [diff] [blame] | 201 | ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0) |
Matthew Wilcox | 92a1f4b | 2007-12-06 10:55:25 -0500 | [diff] [blame] | 202 | #define task_contributes_to_load(task) \ |
| 203 | ((task->state & TASK_UNINTERRUPTIBLE) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | |
| 205 | #define __set_task_state(tsk, state_value) \ |
| 206 | do { (tsk)->state = (state_value); } while (0) |
| 207 | #define set_task_state(tsk, state_value) \ |
| 208 | set_mb((tsk)->state, (state_value)) |
| 209 | |
Andrew Morton | 498d0c5 | 2005-09-13 01:25:14 -0700 | [diff] [blame] | 210 | /* |
| 211 | * set_current_state() includes a barrier so that the write of current->state |
| 212 | * is correctly serialised wrt the caller's subsequent test of whether to |
| 213 | * actually sleep: |
| 214 | * |
| 215 | * set_current_state(TASK_UNINTERRUPTIBLE); |
| 216 | * if (do_i_need_to_sleep()) |
| 217 | * schedule(); |
| 218 | * |
| 219 | * If the caller does not need such serialisation then use __set_current_state() |
| 220 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | #define __set_current_state(state_value) \ |
| 222 | do { current->state = (state_value); } while (0) |
| 223 | #define set_current_state(state_value) \ |
| 224 | set_mb(current->state, (state_value)) |
| 225 | |
| 226 | /* Task command name length */ |
| 227 | #define TASK_COMM_LEN 16 |
| 228 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | #include <linux/spinlock.h> |
| 230 | |
| 231 | /* |
| 232 | * This serializes "schedule()" and also protects |
| 233 | * the run-queue from deletions/modifications (but |
| 234 | * _adding_ to the beginning of the run-queue has |
| 235 | * a separate lock). |
| 236 | */ |
| 237 | extern rwlock_t tasklist_lock; |
| 238 | extern spinlock_t mmlist_lock; |
| 239 | |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 240 | struct task_struct; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | |
| 242 | extern void sched_init(void); |
| 243 | extern void sched_init_smp(void); |
Harvey Harrison | 2d07b25 | 2008-02-15 09:56:34 -0800 | [diff] [blame] | 244 | extern asmlinkage void schedule_tail(struct task_struct *prev); |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 245 | extern void init_idle(struct task_struct *idle, int cpu); |
Ingo Molnar | 1df2105 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 246 | extern void init_idle_bootup_task(struct task_struct *idle); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | |
Ingo Molnar | 017730c | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 248 | extern int runqueue_is_locked(void); |
| 249 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | extern cpumask_t nohz_cpu_mask; |
Siddha, Suresh B | 46cb4b7 | 2007-05-08 00:32:51 -0700 | [diff] [blame] | 251 | #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ) |
| 252 | extern int select_nohz_load_balancer(int cpu); |
| 253 | #else |
| 254 | static inline int select_nohz_load_balancer(int cpu) |
| 255 | { |
| 256 | return 0; |
| 257 | } |
| 258 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | |
Peter Zijlstra | 48d5e25 | 2008-01-25 21:08:31 +0100 | [diff] [blame] | 260 | extern unsigned long rt_needs_cpu(int cpu); |
| 261 | |
Ingo Molnar | e59e2ae | 2006-12-06 20:35:59 -0800 | [diff] [blame] | 262 | /* |
Ingo Molnar | 39bc89f | 2007-04-25 20:50:03 -0700 | [diff] [blame] | 263 | * Only dump TASK_* tasks. (0 for all tasks) |
Ingo Molnar | e59e2ae | 2006-12-06 20:35:59 -0800 | [diff] [blame] | 264 | */ |
| 265 | extern void show_state_filter(unsigned long state_filter); |
| 266 | |
| 267 | static inline void show_state(void) |
| 268 | { |
Ingo Molnar | 39bc89f | 2007-04-25 20:50:03 -0700 | [diff] [blame] | 269 | show_state_filter(0); |
Ingo Molnar | e59e2ae | 2006-12-06 20:35:59 -0800 | [diff] [blame] | 270 | } |
| 271 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | extern void show_regs(struct pt_regs *); |
| 273 | |
| 274 | /* |
| 275 | * TASK is a pointer to the task whose backtrace we want to see (or NULL for current |
| 276 | * task), SP is the stack pointer of the first frame that should be shown in the back |
| 277 | * trace (or NULL if the entire call-chain of the task should be shown). |
| 278 | */ |
| 279 | extern void show_stack(struct task_struct *task, unsigned long *sp); |
| 280 | |
| 281 | void io_schedule(void); |
| 282 | long io_schedule_timeout(long timeout); |
| 283 | |
| 284 | extern void cpu_init (void); |
| 285 | extern void trap_init(void); |
Paul Mackerras | fa13a5a | 2007-11-09 22:39:38 +0100 | [diff] [blame] | 286 | extern void account_process_tick(struct task_struct *task, int user); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | extern void update_process_times(int user); |
| 288 | extern void scheduler_tick(void); |
Peter Zijlstra | 8f4d37e | 2008-01-25 21:08:29 +0100 | [diff] [blame] | 289 | extern void hrtick_resched(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | |
Ingo Molnar | 82a1fcb | 2008-01-25 21:08:02 +0100 | [diff] [blame] | 291 | extern void sched_show_task(struct task_struct *p); |
| 292 | |
Ingo Molnar | 8446f1d | 2005-09-06 15:16:27 -0700 | [diff] [blame] | 293 | #ifdef CONFIG_DETECT_SOFTLOCKUP |
Ingo Molnar | 6687a97 | 2006-03-24 03:18:41 -0800 | [diff] [blame] | 294 | extern void softlockup_tick(void); |
Ingo Molnar | 8446f1d | 2005-09-06 15:16:27 -0700 | [diff] [blame] | 295 | extern void spawn_softlockup_task(void); |
| 296 | extern void touch_softlockup_watchdog(void); |
Jeremy Fitzhardinge | 04c9167 | 2007-05-08 00:28:05 -0700 | [diff] [blame] | 297 | extern void touch_all_softlockup_watchdogs(void); |
Ingo Molnar | 9c44bc0 | 2008-05-12 21:21:04 +0200 | [diff] [blame] | 298 | extern unsigned int softlockup_panic; |
Ingo Molnar | 82a1fcb | 2008-01-25 21:08:02 +0100 | [diff] [blame] | 299 | extern unsigned long sysctl_hung_task_check_count; |
| 300 | extern unsigned long sysctl_hung_task_timeout_secs; |
Ingo Molnar | 9073908 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 301 | extern unsigned long sysctl_hung_task_warnings; |
Dimitri Sivanich | 9383d96 | 2008-05-12 21:21:14 +0200 | [diff] [blame] | 302 | extern int softlockup_thresh; |
Ingo Molnar | 8446f1d | 2005-09-06 15:16:27 -0700 | [diff] [blame] | 303 | #else |
Ingo Molnar | 6687a97 | 2006-03-24 03:18:41 -0800 | [diff] [blame] | 304 | static inline void softlockup_tick(void) |
Ingo Molnar | 8446f1d | 2005-09-06 15:16:27 -0700 | [diff] [blame] | 305 | { |
| 306 | } |
| 307 | static inline void spawn_softlockup_task(void) |
| 308 | { |
| 309 | } |
| 310 | static inline void touch_softlockup_watchdog(void) |
| 311 | { |
| 312 | } |
Jeremy Fitzhardinge | 04c9167 | 2007-05-08 00:28:05 -0700 | [diff] [blame] | 313 | static inline void touch_all_softlockup_watchdogs(void) |
| 314 | { |
| 315 | } |
Ingo Molnar | 8446f1d | 2005-09-06 15:16:27 -0700 | [diff] [blame] | 316 | #endif |
| 317 | |
| 318 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | /* Attach to any functions which should be ignored in wchan output. */ |
| 320 | #define __sched __attribute__((__section__(".sched.text"))) |
Ingo Molnar | deaf222 | 2007-11-28 15:52:56 +0100 | [diff] [blame] | 321 | |
| 322 | /* Linker adds these: start and end of __sched functions */ |
| 323 | extern char __sched_text_start[], __sched_text_end[]; |
| 324 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | /* Is this address in the __sched functions? */ |
| 326 | extern int in_sched_functions(unsigned long addr); |
| 327 | |
| 328 | #define MAX_SCHEDULE_TIMEOUT LONG_MAX |
Harvey Harrison | b3c9752 | 2008-02-13 15:03:15 -0800 | [diff] [blame] | 329 | extern signed long schedule_timeout(signed long timeout); |
Nishanth Aravamudan | 64ed93a | 2005-09-10 00:27:21 -0700 | [diff] [blame] | 330 | extern signed long schedule_timeout_interruptible(signed long timeout); |
Matthew Wilcox | 294d5cc | 2007-12-06 11:59:46 -0500 | [diff] [blame] | 331 | extern signed long schedule_timeout_killable(signed long timeout); |
Nishanth Aravamudan | 64ed93a | 2005-09-10 00:27:21 -0700 | [diff] [blame] | 332 | extern signed long schedule_timeout_uninterruptible(signed long timeout); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | asmlinkage void schedule(void); |
| 334 | |
Serge E. Hallyn | ab51601 | 2006-10-02 02:18:06 -0700 | [diff] [blame] | 335 | struct nsproxy; |
Cedric Le Goater | acce292 | 2007-07-15 23:40:59 -0700 | [diff] [blame] | 336 | struct user_namespace; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | |
| 338 | /* Maximum number of active map areas.. This is a random (large) number */ |
| 339 | #define DEFAULT_MAX_MAP_COUNT 65536 |
| 340 | |
| 341 | extern int sysctl_max_map_count; |
| 342 | |
| 343 | #include <linux/aio.h> |
| 344 | |
| 345 | extern unsigned long |
| 346 | arch_get_unmapped_area(struct file *, unsigned long, unsigned long, |
| 347 | unsigned long, unsigned long); |
| 348 | extern unsigned long |
| 349 | arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, |
| 350 | unsigned long len, unsigned long pgoff, |
| 351 | unsigned long flags); |
Wolfgang Wander | 1363c3c | 2005-06-21 17:14:49 -0700 | [diff] [blame] | 352 | extern void arch_unmap_area(struct mm_struct *, unsigned long); |
| 353 | extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | |
Hugh Dickins | f412ac0 | 2005-10-29 18:16:41 -0700 | [diff] [blame] | 355 | #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS |
| 356 | /* |
| 357 | * The mm counters are not protected by its page_table_lock, |
| 358 | * so must be incremented atomically. |
| 359 | */ |
Christoph Lameter | d3cb487 | 2006-01-06 00:11:20 -0800 | [diff] [blame] | 360 | #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value) |
| 361 | #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member)) |
| 362 | #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member) |
| 363 | #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member) |
| 364 | #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member) |
Hugh Dickins | f412ac0 | 2005-10-29 18:16:41 -0700 | [diff] [blame] | 365 | |
| 366 | #else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */ |
| 367 | /* |
| 368 | * The mm counters are protected by its page_table_lock, |
| 369 | * so can be incremented directly. |
| 370 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | #define set_mm_counter(mm, member, value) (mm)->_##member = (value) |
| 372 | #define get_mm_counter(mm, member) ((mm)->_##member) |
| 373 | #define add_mm_counter(mm, member, value) (mm)->_##member += (value) |
| 374 | #define inc_mm_counter(mm, member) (mm)->_##member++ |
| 375 | #define dec_mm_counter(mm, member) (mm)->_##member-- |
Hugh Dickins | 4294621 | 2005-10-29 18:16:05 -0700 | [diff] [blame] | 376 | |
Hugh Dickins | f412ac0 | 2005-10-29 18:16:41 -0700 | [diff] [blame] | 377 | #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */ |
| 378 | |
| 379 | #define get_mm_rss(mm) \ |
| 380 | (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss)) |
Hugh Dickins | 365e9c87 | 2005-10-29 18:16:18 -0700 | [diff] [blame] | 381 | #define update_hiwater_rss(mm) do { \ |
| 382 | unsigned long _rss = get_mm_rss(mm); \ |
| 383 | if ((mm)->hiwater_rss < _rss) \ |
| 384 | (mm)->hiwater_rss = _rss; \ |
| 385 | } while (0) |
| 386 | #define update_hiwater_vm(mm) do { \ |
| 387 | if ((mm)->hiwater_vm < (mm)->total_vm) \ |
| 388 | (mm)->hiwater_vm = (mm)->total_vm; \ |
| 389 | } while (0) |
| 390 | |
Kawai, Hidehiro | 6c5d523 | 2007-07-19 01:48:27 -0700 | [diff] [blame] | 391 | extern void set_dumpable(struct mm_struct *mm, int value); |
| 392 | extern int get_dumpable(struct mm_struct *mm); |
| 393 | |
| 394 | /* mm flags */ |
Kawai, Hidehiro | 3cb4a0b | 2007-07-19 01:48:28 -0700 | [diff] [blame] | 395 | /* dumpable bits */ |
Kawai, Hidehiro | 6c5d523 | 2007-07-19 01:48:27 -0700 | [diff] [blame] | 396 | #define MMF_DUMPABLE 0 /* core dump is permitted */ |
| 397 | #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */ |
Kawai, Hidehiro | 3cb4a0b | 2007-07-19 01:48:28 -0700 | [diff] [blame] | 398 | #define MMF_DUMPABLE_BITS 2 |
| 399 | |
| 400 | /* coredump filter bits */ |
| 401 | #define MMF_DUMP_ANON_PRIVATE 2 |
| 402 | #define MMF_DUMP_ANON_SHARED 3 |
| 403 | #define MMF_DUMP_MAPPED_PRIVATE 4 |
| 404 | #define MMF_DUMP_MAPPED_SHARED 5 |
Roland McGrath | 82df397 | 2007-10-16 23:27:02 -0700 | [diff] [blame] | 405 | #define MMF_DUMP_ELF_HEADERS 6 |
Kawai, Hidehiro | 3cb4a0b | 2007-07-19 01:48:28 -0700 | [diff] [blame] | 406 | #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS |
Roland McGrath | 82df397 | 2007-10-16 23:27:02 -0700 | [diff] [blame] | 407 | #define MMF_DUMP_FILTER_BITS 5 |
Kawai, Hidehiro | 3cb4a0b | 2007-07-19 01:48:28 -0700 | [diff] [blame] | 408 | #define MMF_DUMP_FILTER_MASK \ |
| 409 | (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT) |
| 410 | #define MMF_DUMP_FILTER_DEFAULT \ |
| 411 | ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED)) |
Kawai, Hidehiro | 6c5d523 | 2007-07-19 01:48:27 -0700 | [diff] [blame] | 412 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | struct sighand_struct { |
| 414 | atomic_t count; |
| 415 | struct k_sigaction action[_NSIG]; |
| 416 | spinlock_t siglock; |
Davide Libenzi | b8fceee | 2007-09-20 12:40:16 -0700 | [diff] [blame] | 417 | wait_queue_head_t signalfd_wqh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | }; |
| 419 | |
KaiGai Kohei | 0e46481 | 2006-06-25 05:49:24 -0700 | [diff] [blame] | 420 | struct pacct_struct { |
KaiGai Kohei | f6ec29a | 2006-06-25 05:49:25 -0700 | [diff] [blame] | 421 | int ac_flag; |
| 422 | long ac_exitcode; |
KaiGai Kohei | 0e46481 | 2006-06-25 05:49:24 -0700 | [diff] [blame] | 423 | unsigned long ac_mem; |
KaiGai Kohei | 77787bf | 2006-06-25 05:49:26 -0700 | [diff] [blame] | 424 | cputime_t ac_utime, ac_stime; |
| 425 | unsigned long ac_minflt, ac_majflt; |
KaiGai Kohei | 0e46481 | 2006-06-25 05:49:24 -0700 | [diff] [blame] | 426 | }; |
| 427 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | /* |
| 429 | * NOTE! "signal_struct" does not have it's own |
| 430 | * locking, because a shared signal_struct always |
| 431 | * implies a shared sighand_struct, so locking |
| 432 | * sighand_struct is always a proper superset of |
| 433 | * the locking of signal_struct. |
| 434 | */ |
| 435 | struct signal_struct { |
| 436 | atomic_t count; |
| 437 | atomic_t live; |
| 438 | |
| 439 | wait_queue_head_t wait_chldexit; /* for wait4() */ |
| 440 | |
| 441 | /* current thread group signal load-balancing target: */ |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 442 | struct task_struct *curr_target; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | |
| 444 | /* shared signal handling: */ |
| 445 | struct sigpending shared_pending; |
| 446 | |
| 447 | /* thread group exit support */ |
| 448 | int group_exit_code; |
| 449 | /* overloaded: |
| 450 | * - notify group_exit_task when ->count is equal to notify_count |
| 451 | * - everyone except group_exit_task is stopped during signal delivery |
| 452 | * of fatal signals, group_exit_task processes the signal. |
| 453 | */ |
| 454 | struct task_struct *group_exit_task; |
| 455 | int notify_count; |
| 456 | |
| 457 | /* thread group stop support, overloads group_exit_code too */ |
| 458 | int group_stop_count; |
| 459 | unsigned int flags; /* see SIGNAL_* flags below */ |
| 460 | |
| 461 | /* POSIX.1b Interval Timers */ |
| 462 | struct list_head posix_timers; |
| 463 | |
| 464 | /* ITIMER_REAL timer for the process */ |
Thomas Gleixner | 2ff678b | 2006-01-09 20:52:34 -0800 | [diff] [blame] | 465 | struct hrtimer real_timer; |
Oleg Nesterov | fea9d17 | 2008-02-08 04:19:19 -0800 | [diff] [blame] | 466 | struct pid *leader_pid; |
Thomas Gleixner | 2ff678b | 2006-01-09 20:52:34 -0800 | [diff] [blame] | 467 | ktime_t it_real_incr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | |
| 469 | /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */ |
| 470 | cputime_t it_prof_expires, it_virt_expires; |
| 471 | cputime_t it_prof_incr, it_virt_incr; |
| 472 | |
| 473 | /* job control IDs */ |
Pavel Emelyanov | 9a2e705 | 2007-10-18 23:40:39 -0700 | [diff] [blame] | 474 | |
| 475 | /* |
| 476 | * pgrp and session fields are deprecated. |
| 477 | * use the task_session_Xnr and task_pgrp_Xnr routines below |
| 478 | */ |
| 479 | |
| 480 | union { |
| 481 | pid_t pgrp __deprecated; |
| 482 | pid_t __pgrp; |
| 483 | }; |
| 484 | |
Eric W. Biederman | ab521dc | 2007-02-12 00:53:00 -0800 | [diff] [blame] | 485 | struct pid *tty_old_pgrp; |
Cedric Le Goater | 1ec320a | 2006-12-08 02:37:55 -0800 | [diff] [blame] | 486 | |
| 487 | union { |
| 488 | pid_t session __deprecated; |
| 489 | pid_t __session; |
| 490 | }; |
| 491 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | /* boolean value for session group leader */ |
| 493 | int leader; |
| 494 | |
| 495 | struct tty_struct *tty; /* NULL if no tty */ |
| 496 | |
| 497 | /* |
| 498 | * Cumulative resource counters for dead threads in the group, |
| 499 | * and for reaped dead child processes forked by this group. |
| 500 | * Live threads maintain their own counters and add to these |
| 501 | * in __exit_signal, except for the group leader. |
| 502 | */ |
| 503 | cputime_t utime, stime, cutime, cstime; |
Laurent Vivier | 9ac5231 | 2007-10-15 17:00:19 +0200 | [diff] [blame] | 504 | cputime_t gtime; |
| 505 | cputime_t cgtime; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; |
| 507 | unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; |
Eric Dumazet | 6eaeeab | 2007-05-10 22:22:37 -0700 | [diff] [blame] | 508 | unsigned long inblock, oublock, cinblock, coublock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | |
| 510 | /* |
| 511 | * Cumulative ns of scheduled CPU time for dead threads in the |
| 512 | * group, not including a zombie group leader. (This only differs |
| 513 | * from jiffies_to_ns(utime + stime) if sched_clock uses something |
| 514 | * other than jiffies.) |
| 515 | */ |
Ingo Molnar | 41b86e9 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 516 | unsigned long long sum_sched_runtime; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | |
| 518 | /* |
| 519 | * We don't bother to synchronize most readers of this at all, |
| 520 | * because there is no reader checking a limit that actually needs |
| 521 | * to get both rlim_cur and rlim_max atomically, and either one |
| 522 | * alone is a single word that can safely be read normally. |
| 523 | * getrlimit/setrlimit use task_lock(current->group_leader) to |
| 524 | * protect this instead of the siglock, because they really |
| 525 | * have no need to disable irqs. |
| 526 | */ |
| 527 | struct rlimit rlim[RLIM_NLIMITS]; |
| 528 | |
| 529 | struct list_head cpu_timers[3]; |
| 530 | |
| 531 | /* keep the process-shared keyrings here so that they do the right |
| 532 | * thing in threads created with CLONE_THREAD */ |
| 533 | #ifdef CONFIG_KEYS |
| 534 | struct key *session_keyring; /* keyring inherited over fork */ |
| 535 | struct key *process_keyring; /* keyring private to this process */ |
| 536 | #endif |
KaiGai Kohei | 0e46481 | 2006-06-25 05:49:24 -0700 | [diff] [blame] | 537 | #ifdef CONFIG_BSD_PROCESS_ACCT |
| 538 | struct pacct_struct pacct; /* per-process accounting information */ |
| 539 | #endif |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 540 | #ifdef CONFIG_TASKSTATS |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 541 | struct taskstats *stats; |
| 542 | #endif |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 543 | #ifdef CONFIG_AUDIT |
| 544 | unsigned audit_tty; |
| 545 | struct tty_audit_buf *tty_audit_buf; |
| 546 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | }; |
| 548 | |
Nick Piggin | 4866cde | 2005-06-25 14:57:23 -0700 | [diff] [blame] | 549 | /* Context switch must be unlocked if interrupts are to be enabled */ |
| 550 | #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW |
| 551 | # define __ARCH_WANT_UNLOCKED_CTXSW |
| 552 | #endif |
| 553 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | /* |
| 555 | * Bits in flags field of signal_struct. |
| 556 | */ |
| 557 | #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ |
| 558 | #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */ |
| 559 | #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */ |
| 560 | #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */ |
Oleg Nesterov | e442055 | 2008-04-30 00:52:44 -0700 | [diff] [blame] | 561 | /* |
| 562 | * Pending notifications to parent. |
| 563 | */ |
| 564 | #define SIGNAL_CLD_STOPPED 0x00000010 |
| 565 | #define SIGNAL_CLD_CONTINUED 0x00000020 |
| 566 | #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | |
Oleg Nesterov | fae5fa4 | 2008-04-30 00:53:03 -0700 | [diff] [blame] | 568 | #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */ |
| 569 | |
Oleg Nesterov | ed5d2ca | 2008-02-04 22:27:24 -0800 | [diff] [blame] | 570 | /* If true, all threads except ->group_exit_task have pending SIGKILL */ |
| 571 | static inline int signal_group_exit(const struct signal_struct *sig) |
| 572 | { |
| 573 | return (sig->flags & SIGNAL_GROUP_EXIT) || |
| 574 | (sig->group_exit_task != NULL); |
| 575 | } |
| 576 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | /* |
| 578 | * Some day this will be a full-fledged user tracking system.. |
| 579 | */ |
| 580 | struct user_struct { |
| 581 | atomic_t __count; /* reference count */ |
| 582 | atomic_t processes; /* How many processes does this user have? */ |
| 583 | atomic_t files; /* How many open files does this user have? */ |
| 584 | atomic_t sigpending; /* How many pending signals does this user have? */ |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 585 | #ifdef CONFIG_INOTIFY_USER |
Robert Love | 0eeca28 | 2005-07-12 17:06:03 -0400 | [diff] [blame] | 586 | atomic_t inotify_watches; /* How many inotify watches does this user have? */ |
| 587 | atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ |
| 588 | #endif |
Alexey Dobriyan | 970a864 | 2007-10-16 23:30:09 -0700 | [diff] [blame] | 589 | #ifdef CONFIG_POSIX_MQUEUE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | /* protected by mq_lock */ |
| 591 | unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ |
Alexey Dobriyan | 970a864 | 2007-10-16 23:30:09 -0700 | [diff] [blame] | 592 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | unsigned long locked_shm; /* How many pages of mlocked shm ? */ |
| 594 | |
| 595 | #ifdef CONFIG_KEYS |
| 596 | struct key *uid_keyring; /* UID specific keyring */ |
| 597 | struct key *session_keyring; /* UID's default session keyring */ |
| 598 | #endif |
| 599 | |
| 600 | /* Hash table maintenance information */ |
Pavel Emelyanov | 735de22 | 2007-09-18 22:46:44 -0700 | [diff] [blame] | 601 | struct hlist_node uidhash_node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | uid_t uid; |
Srivatsa Vaddagiri | 24e377a | 2007-10-15 17:00:09 +0200 | [diff] [blame] | 603 | |
Peter Zijlstra | 052f1dc | 2008-02-13 15:45:40 +0100 | [diff] [blame] | 604 | #ifdef CONFIG_USER_SCHED |
Ingo Molnar | 4cf86d7 | 2007-10-15 17:00:14 +0200 | [diff] [blame] | 605 | struct task_group *tg; |
Dhaval Giani | b1a8c17 | 2007-10-17 16:55:11 +0200 | [diff] [blame] | 606 | #ifdef CONFIG_SYSFS |
Kay Sievers | eb41d94 | 2007-11-02 13:47:53 +0100 | [diff] [blame] | 607 | struct kobject kobj; |
Dhaval Giani | 5cb350b | 2007-10-15 17:00:14 +0200 | [diff] [blame] | 608 | struct work_struct work; |
Srivatsa Vaddagiri | 24e377a | 2007-10-15 17:00:09 +0200 | [diff] [blame] | 609 | #endif |
Dhaval Giani | b1a8c17 | 2007-10-17 16:55:11 +0200 | [diff] [blame] | 610 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | }; |
| 612 | |
Kay Sievers | eb41d94 | 2007-11-02 13:47:53 +0100 | [diff] [blame] | 613 | extern int uids_sysfs_init(void); |
Dhaval Giani | 5cb350b | 2007-10-15 17:00:14 +0200 | [diff] [blame] | 614 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | extern struct user_struct *find_user(uid_t); |
| 616 | |
| 617 | extern struct user_struct root_user; |
| 618 | #define INIT_USER (&root_user) |
| 619 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | struct backing_dev_info; |
| 621 | struct reclaim_state; |
| 622 | |
Chandra Seetharaman | 52f17b6 | 2006-07-14 00:24:38 -0700 | [diff] [blame] | 623 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | struct sched_info { |
| 625 | /* cumulative counters */ |
Ingo Molnar | 2d72376 | 2007-10-15 17:00:12 +0200 | [diff] [blame] | 626 | unsigned long pcount; /* # of times run on this cpu */ |
Balbir Singh | 172ba84 | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 627 | unsigned long long cpu_time, /* time spent on the cpu */ |
| 628 | run_delay; /* time spent waiting on a runqueue */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | |
| 630 | /* timestamps */ |
Balbir Singh | 172ba84 | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 631 | unsigned long long last_arrival,/* when we last ran on a cpu */ |
| 632 | last_queued; /* when we were last queued to run */ |
Ingo Molnar | b8efb56 | 2007-10-15 17:00:10 +0200 | [diff] [blame] | 633 | #ifdef CONFIG_SCHEDSTATS |
| 634 | /* BKL stats */ |
Ken Chen | 480b943 | 2007-10-18 21:32:56 +0200 | [diff] [blame] | 635 | unsigned int bkl_count; |
Ingo Molnar | b8efb56 | 2007-10-15 17:00:10 +0200 | [diff] [blame] | 636 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | }; |
Chandra Seetharaman | 52f17b6 | 2006-07-14 00:24:38 -0700 | [diff] [blame] | 638 | #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | |
Chandra Seetharaman | 52f17b6 | 2006-07-14 00:24:38 -0700 | [diff] [blame] | 640 | #ifdef CONFIG_SCHEDSTATS |
Helge Deller | 15ad7cd | 2006-12-06 20:40:36 -0800 | [diff] [blame] | 641 | extern const struct file_operations proc_schedstat_operations; |
Chandra Seetharaman | 52f17b6 | 2006-07-14 00:24:38 -0700 | [diff] [blame] | 642 | #endif /* CONFIG_SCHEDSTATS */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 644 | #ifdef CONFIG_TASK_DELAY_ACCT |
| 645 | struct task_delay_info { |
| 646 | spinlock_t lock; |
| 647 | unsigned int flags; /* Private per-task flags */ |
| 648 | |
| 649 | /* For each stat XXX, add following, aligned appropriately |
| 650 | * |
| 651 | * struct timespec XXX_start, XXX_end; |
| 652 | * u64 XXX_delay; |
| 653 | * u32 XXX_count; |
| 654 | * |
| 655 | * Atomicity of updates to XXX_delay, XXX_count protected by |
| 656 | * single lock above (split into XXX_lock if contention is an issue). |
| 657 | */ |
Shailabh Nagar | 0ff9224 | 2006-07-14 00:24:37 -0700 | [diff] [blame] | 658 | |
| 659 | /* |
| 660 | * XXX_count is incremented on every XXX operation, the delay |
| 661 | * associated with the operation is added to XXX_delay. |
| 662 | * XXX_delay contains the accumulated delay time in nanoseconds. |
| 663 | */ |
| 664 | struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */ |
| 665 | u64 blkio_delay; /* wait for sync block io completion */ |
| 666 | u64 swapin_delay; /* wait for swapin block io completion */ |
| 667 | u32 blkio_count; /* total count of the number of sync block */ |
| 668 | /* io operations performed */ |
| 669 | u32 swapin_count; /* total count of the number of swapin block */ |
| 670 | /* io operations performed */ |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 671 | }; |
Chandra Seetharaman | 52f17b6 | 2006-07-14 00:24:38 -0700 | [diff] [blame] | 672 | #endif /* CONFIG_TASK_DELAY_ACCT */ |
| 673 | |
| 674 | static inline int sched_info_on(void) |
| 675 | { |
| 676 | #ifdef CONFIG_SCHEDSTATS |
| 677 | return 1; |
| 678 | #elif defined(CONFIG_TASK_DELAY_ACCT) |
| 679 | extern int delayacct_on; |
| 680 | return delayacct_on; |
| 681 | #else |
| 682 | return 0; |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 683 | #endif |
Chandra Seetharaman | 52f17b6 | 2006-07-14 00:24:38 -0700 | [diff] [blame] | 684 | } |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 685 | |
Ingo Molnar | d15bcfd | 2007-07-09 18:51:57 +0200 | [diff] [blame] | 686 | enum cpu_idle_type { |
| 687 | CPU_IDLE, |
| 688 | CPU_NOT_IDLE, |
| 689 | CPU_NEWLY_IDLE, |
| 690 | CPU_MAX_IDLE_TYPES |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | }; |
| 692 | |
| 693 | /* |
| 694 | * sched-domains (multiprocessor balancing) declarations: |
| 695 | */ |
Ingo Molnar | 9aa7b36 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 696 | |
| 697 | /* |
| 698 | * Increase resolution of nice-level calculations: |
| 699 | */ |
| 700 | #define SCHED_LOAD_SHIFT 10 |
| 701 | #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT) |
| 702 | |
Suresh Siddha | f8700df | 2007-08-23 15:18:02 +0200 | [diff] [blame] | 703 | #define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | |
Peter Williams | 2dd73a4 | 2006-06-27 02:54:34 -0700 | [diff] [blame] | 705 | #ifdef CONFIG_SMP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */ |
| 707 | #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */ |
| 708 | #define SD_BALANCE_EXEC 4 /* Balance on exec */ |
Nick Piggin | 147cbb4 | 2005-06-25 14:57:19 -0700 | [diff] [blame] | 709 | #define SD_BALANCE_FORK 8 /* Balance on fork, clone */ |
| 710 | #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */ |
| 711 | #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */ |
| 712 | #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */ |
| 713 | #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */ |
Siddha, Suresh B | 5c45bf2 | 2006-06-27 02:54:42 -0700 | [diff] [blame] | 714 | #define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */ |
Siddha, Suresh B | 89c4710 | 2006-10-03 01:14:09 -0700 | [diff] [blame] | 715 | #define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */ |
Christoph Lameter | 08c183f | 2006-12-10 02:20:29 -0800 | [diff] [blame] | 716 | #define SD_SERIALIZE 1024 /* Only a single load balancing instance */ |
Hidetoshi Seto | 1d3504f | 2008-04-15 14:04:23 +0900 | [diff] [blame] | 717 | #define SD_WAKE_IDLE_FAR 2048 /* Gain latency sacrificing cache hit */ |
Siddha, Suresh B | 5c45bf2 | 2006-06-27 02:54:42 -0700 | [diff] [blame] | 718 | |
Siddha, Suresh B | 89c4710 | 2006-10-03 01:14:09 -0700 | [diff] [blame] | 719 | #define BALANCE_FOR_MC_POWER \ |
| 720 | (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0) |
| 721 | |
| 722 | #define BALANCE_FOR_PKG_POWER \ |
| 723 | ((sched_mc_power_savings || sched_smt_power_savings) ? \ |
| 724 | SD_POWERSAVINGS_BALANCE : 0) |
| 725 | |
| 726 | #define test_sd_parent(sd, flag) ((sd->parent && \ |
| 727 | (sd->parent->flags & flag)) ? 1 : 0) |
Siddha, Suresh B | 5c45bf2 | 2006-06-27 02:54:42 -0700 | [diff] [blame] | 728 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | |
| 730 | struct sched_group { |
| 731 | struct sched_group *next; /* Must be a circular list */ |
| 732 | cpumask_t cpumask; |
| 733 | |
| 734 | /* |
| 735 | * CPU power of this group, SCHED_LOAD_SCALE being max power for a |
| 736 | * single CPU. This is read only (except for setup, hotplug CPU). |
Eric Dumazet | 5517d86 | 2007-05-08 00:32:57 -0700 | [diff] [blame] | 737 | * Note : Never change cpu_power without recompute its reciprocal |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | */ |
Eric Dumazet | 5517d86 | 2007-05-08 00:32:57 -0700 | [diff] [blame] | 739 | unsigned int __cpu_power; |
| 740 | /* |
| 741 | * reciprocal value of cpu_power to avoid expensive divides |
| 742 | * (see include/linux/reciprocal_div.h) |
| 743 | */ |
| 744 | u32 reciprocal_cpu_power; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | }; |
| 746 | |
Hidetoshi Seto | 1d3504f | 2008-04-15 14:04:23 +0900 | [diff] [blame] | 747 | enum sched_domain_level { |
| 748 | SD_LV_NONE = 0, |
| 749 | SD_LV_SIBLING, |
| 750 | SD_LV_MC, |
| 751 | SD_LV_CPU, |
| 752 | SD_LV_NODE, |
| 753 | SD_LV_ALLNODES, |
| 754 | SD_LV_MAX |
| 755 | }; |
| 756 | |
| 757 | struct sched_domain_attr { |
| 758 | int relax_domain_level; |
| 759 | }; |
| 760 | |
| 761 | #define SD_ATTR_INIT (struct sched_domain_attr) { \ |
| 762 | .relax_domain_level = -1, \ |
| 763 | } |
| 764 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | struct sched_domain { |
| 766 | /* These fields must be setup */ |
| 767 | struct sched_domain *parent; /* top domain must be null terminated */ |
Siddha, Suresh B | 1a84887 | 2006-10-03 01:14:08 -0700 | [diff] [blame] | 768 | struct sched_domain *child; /* bottom domain must be null terminated */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | struct sched_group *groups; /* the balancing groups of the domain */ |
| 770 | cpumask_t span; /* span of all CPUs in this domain */ |
| 771 | unsigned long min_interval; /* Minimum balance interval ms */ |
| 772 | unsigned long max_interval; /* Maximum balance interval ms */ |
| 773 | unsigned int busy_factor; /* less balancing by factor if busy */ |
| 774 | unsigned int imbalance_pct; /* No balance until over watermark */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ |
Nick Piggin | 7897986 | 2005-06-25 14:57:13 -0700 | [diff] [blame] | 776 | unsigned int busy_idx; |
| 777 | unsigned int idle_idx; |
| 778 | unsigned int newidle_idx; |
| 779 | unsigned int wake_idx; |
Nick Piggin | 147cbb4 | 2005-06-25 14:57:19 -0700 | [diff] [blame] | 780 | unsigned int forkexec_idx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | int flags; /* See SD_* */ |
Hidetoshi Seto | 1d3504f | 2008-04-15 14:04:23 +0900 | [diff] [blame] | 782 | enum sched_domain_level level; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | |
| 784 | /* Runtime fields. */ |
| 785 | unsigned long last_balance; /* init to jiffies. units in jiffies */ |
| 786 | unsigned int balance_interval; /* initialise to 1. units in ms. */ |
| 787 | unsigned int nr_balance_failed; /* initialise to 0 */ |
| 788 | |
Peter Zijlstra | 2398f2c | 2008-06-27 13:41:35 +0200 | [diff] [blame] | 789 | u64 last_update; |
| 790 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | #ifdef CONFIG_SCHEDSTATS |
| 792 | /* load_balance() stats */ |
Ken Chen | 480b943 | 2007-10-18 21:32:56 +0200 | [diff] [blame] | 793 | unsigned int lb_count[CPU_MAX_IDLE_TYPES]; |
| 794 | unsigned int lb_failed[CPU_MAX_IDLE_TYPES]; |
| 795 | unsigned int lb_balanced[CPU_MAX_IDLE_TYPES]; |
| 796 | unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES]; |
| 797 | unsigned int lb_gained[CPU_MAX_IDLE_TYPES]; |
| 798 | unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; |
| 799 | unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; |
| 800 | unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | |
| 802 | /* Active load balancing */ |
Ken Chen | 480b943 | 2007-10-18 21:32:56 +0200 | [diff] [blame] | 803 | unsigned int alb_count; |
| 804 | unsigned int alb_failed; |
| 805 | unsigned int alb_pushed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | |
Nick Piggin | 68767a0 | 2005-06-25 14:57:20 -0700 | [diff] [blame] | 807 | /* SD_BALANCE_EXEC stats */ |
Ken Chen | 480b943 | 2007-10-18 21:32:56 +0200 | [diff] [blame] | 808 | unsigned int sbe_count; |
| 809 | unsigned int sbe_balanced; |
| 810 | unsigned int sbe_pushed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | |
Nick Piggin | 68767a0 | 2005-06-25 14:57:20 -0700 | [diff] [blame] | 812 | /* SD_BALANCE_FORK stats */ |
Ken Chen | 480b943 | 2007-10-18 21:32:56 +0200 | [diff] [blame] | 813 | unsigned int sbf_count; |
| 814 | unsigned int sbf_balanced; |
| 815 | unsigned int sbf_pushed; |
Nick Piggin | 68767a0 | 2005-06-25 14:57:20 -0700 | [diff] [blame] | 816 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | /* try_to_wake_up() stats */ |
Ken Chen | 480b943 | 2007-10-18 21:32:56 +0200 | [diff] [blame] | 818 | unsigned int ttwu_wake_remote; |
| 819 | unsigned int ttwu_move_affine; |
| 820 | unsigned int ttwu_move_balance; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | #endif |
| 822 | }; |
| 823 | |
Hidetoshi Seto | 1d3504f | 2008-04-15 14:04:23 +0900 | [diff] [blame] | 824 | extern void partition_sched_domains(int ndoms_new, cpumask_t *doms_new, |
| 825 | struct sched_domain_attr *dattr_new); |
Heiko Carstens | 9aefd0a | 2008-03-12 18:31:58 +0100 | [diff] [blame] | 826 | extern int arch_reinit_sched_domains(void); |
Paul Jackson | 029190c | 2007-10-18 23:40:20 -0700 | [diff] [blame] | 827 | |
Ingo Molnar | 1b427c1 | 2008-07-18 14:01:39 +0200 | [diff] [blame] | 828 | #else /* CONFIG_SMP */ |
| 829 | |
| 830 | struct sched_domain_attr; |
| 831 | |
| 832 | static inline void |
| 833 | partition_sched_domains(int ndoms_new, cpumask_t *doms_new, |
| 834 | struct sched_domain_attr *dattr_new) |
| 835 | { |
| 836 | } |
| 837 | #endif /* !CONFIG_SMP */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | struct io_context; /* See blkdev.h */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | #define NGROUPS_SMALL 32 |
Eric Dumazet | 1bf4734 | 2008-02-06 01:37:56 -0800 | [diff] [blame] | 841 | #define NGROUPS_PER_BLOCK ((unsigned int)(PAGE_SIZE / sizeof(gid_t))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | struct group_info { |
| 843 | int ngroups; |
| 844 | atomic_t usage; |
| 845 | gid_t small_block[NGROUPS_SMALL]; |
| 846 | int nblocks; |
| 847 | gid_t *blocks[0]; |
| 848 | }; |
| 849 | |
| 850 | /* |
| 851 | * get_group_info() must be called with the owning task locked (via task_lock()) |
| 852 | * when task != current. The reason being that the vast majority of callers are |
| 853 | * looking at current->group_info, which can not be changed except by the |
| 854 | * current task. Changing current->group_info requires the task lock, too. |
| 855 | */ |
| 856 | #define get_group_info(group_info) do { \ |
| 857 | atomic_inc(&(group_info)->usage); \ |
| 858 | } while (0) |
| 859 | |
| 860 | #define put_group_info(group_info) do { \ |
| 861 | if (atomic_dec_and_test(&(group_info)->usage)) \ |
| 862 | groups_free(group_info); \ |
| 863 | } while (0) |
| 864 | |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 865 | extern struct group_info *groups_alloc(int gidsetsize); |
| 866 | extern void groups_free(struct group_info *group_info); |
| 867 | extern int set_current_groups(struct group_info *group_info); |
| 868 | extern int groups_search(struct group_info *group_info, gid_t grp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | /* access the groups "array" with this macro */ |
| 870 | #define GROUP_AT(gi, i) \ |
| 871 | ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK]) |
| 872 | |
Chen, Kenneth W | 383f283 | 2005-09-09 13:02:02 -0700 | [diff] [blame] | 873 | #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 874 | extern void prefetch_stack(struct task_struct *t); |
Chen, Kenneth W | 383f283 | 2005-09-09 13:02:02 -0700 | [diff] [blame] | 875 | #else |
| 876 | static inline void prefetch_stack(struct task_struct *t) { } |
| 877 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | |
| 879 | struct audit_context; /* See audit.c */ |
| 880 | struct mempolicy; |
Jens Axboe | b92ce55 | 2006-04-11 13:52:07 +0200 | [diff] [blame] | 881 | struct pipe_inode_info; |
Serge E. Hallyn | 4865ecf | 2006-10-02 02:18:14 -0700 | [diff] [blame] | 882 | struct uts_namespace; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 884 | struct rq; |
| 885 | struct sched_domain; |
| 886 | |
| 887 | struct sched_class { |
Ingo Molnar | 5522d5d | 2007-10-15 17:00:12 +0200 | [diff] [blame] | 888 | const struct sched_class *next; |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 889 | |
Ingo Molnar | fd390f6 | 2007-08-09 11:16:48 +0200 | [diff] [blame] | 890 | void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup); |
Ingo Molnar | f02231e | 2007-08-09 11:16:48 +0200 | [diff] [blame] | 891 | void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep); |
Dmitry Adamushko | 4530d7a | 2007-10-15 17:00:08 +0200 | [diff] [blame] | 892 | void (*yield_task) (struct rq *rq); |
Gregory Haskins | e7693a3 | 2008-01-25 21:08:09 +0100 | [diff] [blame] | 893 | int (*select_task_rq)(struct task_struct *p, int sync); |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 894 | |
| 895 | void (*check_preempt_curr) (struct rq *rq, struct task_struct *p); |
| 896 | |
Ingo Molnar | fb8d472 | 2007-08-09 11:16:48 +0200 | [diff] [blame] | 897 | struct task_struct * (*pick_next_task) (struct rq *rq); |
Ingo Molnar | 31ee529 | 2007-08-09 11:16:49 +0200 | [diff] [blame] | 898 | void (*put_prev_task) (struct rq *rq, struct task_struct *p); |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 899 | |
Peter Williams | 681f3e6 | 2007-10-24 18:23:51 +0200 | [diff] [blame] | 900 | #ifdef CONFIG_SMP |
Peter Williams | 4301065 | 2007-08-09 11:16:46 +0200 | [diff] [blame] | 901 | unsigned long (*load_balance) (struct rq *this_rq, int this_cpu, |
Peter Williams | e1d1484 | 2007-10-24 18:23:51 +0200 | [diff] [blame] | 902 | struct rq *busiest, unsigned long max_load_move, |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 903 | struct sched_domain *sd, enum cpu_idle_type idle, |
Peter Williams | a4ac01c | 2007-08-09 11:16:46 +0200 | [diff] [blame] | 904 | int *all_pinned, int *this_best_prio); |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 905 | |
Peter Williams | e1d1484 | 2007-10-24 18:23:51 +0200 | [diff] [blame] | 906 | int (*move_one_task) (struct rq *this_rq, int this_cpu, |
| 907 | struct rq *busiest, struct sched_domain *sd, |
| 908 | enum cpu_idle_type idle); |
Steven Rostedt | 9a897c5 | 2008-01-25 21:08:22 +0100 | [diff] [blame] | 909 | void (*pre_schedule) (struct rq *this_rq, struct task_struct *task); |
| 910 | void (*post_schedule) (struct rq *this_rq); |
| 911 | void (*task_wake_up) (struct rq *this_rq, struct task_struct *task); |
Peter Williams | 681f3e6 | 2007-10-24 18:23:51 +0200 | [diff] [blame] | 912 | #endif |
Peter Williams | e1d1484 | 2007-10-24 18:23:51 +0200 | [diff] [blame] | 913 | |
Srivatsa Vaddagiri | 83b699e | 2007-10-15 17:00:08 +0200 | [diff] [blame] | 914 | void (*set_curr_task) (struct rq *rq); |
Peter Zijlstra | 8f4d37e | 2008-01-25 21:08:29 +0100 | [diff] [blame] | 915 | void (*task_tick) (struct rq *rq, struct task_struct *p, int queued); |
Ingo Molnar | ee0827d | 2007-08-09 11:16:49 +0200 | [diff] [blame] | 916 | void (*task_new) (struct rq *rq, struct task_struct *p); |
Mike Travis | cd8ba7c | 2008-03-26 14:23:49 -0700 | [diff] [blame] | 917 | void (*set_cpus_allowed)(struct task_struct *p, |
| 918 | const cpumask_t *newmask); |
Gregory Haskins | 57d885f | 2008-01-25 21:08:18 +0100 | [diff] [blame] | 919 | |
Gregory Haskins | 1f11eb6 | 2008-06-04 15:04:05 -0400 | [diff] [blame] | 920 | void (*rq_online)(struct rq *rq); |
| 921 | void (*rq_offline)(struct rq *rq); |
Steven Rostedt | cb46984 | 2008-01-25 21:08:22 +0100 | [diff] [blame] | 922 | |
| 923 | void (*switched_from) (struct rq *this_rq, struct task_struct *task, |
| 924 | int running); |
| 925 | void (*switched_to) (struct rq *this_rq, struct task_struct *task, |
| 926 | int running); |
| 927 | void (*prio_changed) (struct rq *this_rq, struct task_struct *task, |
| 928 | int oldprio, int running); |
Peter Zijlstra | 810b381 | 2008-02-29 15:21:01 -0500 | [diff] [blame] | 929 | |
| 930 | #ifdef CONFIG_FAIR_GROUP_SCHED |
| 931 | void (*moved_group) (struct task_struct *p); |
| 932 | #endif |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 933 | }; |
| 934 | |
| 935 | struct load_weight { |
| 936 | unsigned long weight, inv_weight; |
| 937 | }; |
| 938 | |
| 939 | /* |
| 940 | * CFS stats for a schedulable entity (task, task-group etc) |
| 941 | * |
| 942 | * Current field usage histogram: |
| 943 | * |
| 944 | * 4 se->block_start |
| 945 | * 4 se->run_node |
| 946 | * 4 se->sleep_start |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 947 | * 6 se->load.weight |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 948 | */ |
| 949 | struct sched_entity { |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 950 | struct load_weight load; /* for load-balancing */ |
| 951 | struct rb_node run_node; |
Peter Zijlstra | 4a55bd5 | 2008-04-19 19:45:00 +0200 | [diff] [blame] | 952 | struct list_head group_node; |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 953 | unsigned int on_rq; |
| 954 | |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 955 | u64 exec_start; |
Ingo Molnar | 94c1822 | 2007-08-02 17:41:40 +0200 | [diff] [blame] | 956 | u64 sum_exec_runtime; |
Ingo Molnar | e9acbff | 2007-10-15 17:00:04 +0200 | [diff] [blame] | 957 | u64 vruntime; |
Ingo Molnar | f6cf891 | 2007-08-28 12:53:24 +0200 | [diff] [blame] | 958 | u64 prev_sum_exec_runtime; |
Ingo Molnar | 94c1822 | 2007-08-02 17:41:40 +0200 | [diff] [blame] | 959 | |
Ingo Molnar | 4ae7d5c | 2008-03-19 01:42:00 +0100 | [diff] [blame] | 960 | u64 last_wakeup; |
| 961 | u64 avg_overlap; |
| 962 | |
Ingo Molnar | 94c1822 | 2007-08-02 17:41:40 +0200 | [diff] [blame] | 963 | #ifdef CONFIG_SCHEDSTATS |
| 964 | u64 wait_start; |
| 965 | u64 wait_max; |
Arjan van de Ven | 6d08259 | 2008-01-25 21:08:35 +0100 | [diff] [blame] | 966 | u64 wait_count; |
| 967 | u64 wait_sum; |
Ingo Molnar | 94c1822 | 2007-08-02 17:41:40 +0200 | [diff] [blame] | 968 | |
| 969 | u64 sleep_start; |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 970 | u64 sleep_max; |
Ingo Molnar | 94c1822 | 2007-08-02 17:41:40 +0200 | [diff] [blame] | 971 | s64 sum_sleep_runtime; |
| 972 | |
| 973 | u64 block_start; |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 974 | u64 block_max; |
| 975 | u64 exec_max; |
Ingo Molnar | eba1ed4 | 2007-10-15 17:00:02 +0200 | [diff] [blame] | 976 | u64 slice_max; |
Ingo Molnar | cc36773 | 2007-10-15 17:00:18 +0200 | [diff] [blame] | 977 | |
| 978 | u64 nr_migrations; |
| 979 | u64 nr_migrations_cold; |
| 980 | u64 nr_failed_migrations_affine; |
| 981 | u64 nr_failed_migrations_running; |
| 982 | u64 nr_failed_migrations_hot; |
| 983 | u64 nr_forced_migrations; |
| 984 | u64 nr_forced2_migrations; |
| 985 | |
| 986 | u64 nr_wakeups; |
| 987 | u64 nr_wakeups_sync; |
| 988 | u64 nr_wakeups_migrate; |
| 989 | u64 nr_wakeups_local; |
| 990 | u64 nr_wakeups_remote; |
| 991 | u64 nr_wakeups_affine; |
| 992 | u64 nr_wakeups_affine_attempts; |
| 993 | u64 nr_wakeups_passive; |
| 994 | u64 nr_wakeups_idle; |
Ingo Molnar | 94c1822 | 2007-08-02 17:41:40 +0200 | [diff] [blame] | 995 | #endif |
| 996 | |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 997 | #ifdef CONFIG_FAIR_GROUP_SCHED |
| 998 | struct sched_entity *parent; |
| 999 | /* rq on which this entity is (to be) queued: */ |
| 1000 | struct cfs_rq *cfs_rq; |
| 1001 | /* rq "owned" by this entity/group: */ |
| 1002 | struct cfs_rq *my_q; |
| 1003 | #endif |
| 1004 | }; |
Ingo Molnar | 70b97a7 | 2006-07-03 00:25:42 -0700 | [diff] [blame] | 1005 | |
Peter Zijlstra | fa71706 | 2008-01-25 21:08:27 +0100 | [diff] [blame] | 1006 | struct sched_rt_entity { |
| 1007 | struct list_head run_list; |
| 1008 | unsigned int time_slice; |
Peter Zijlstra | 78f2c7d | 2008-01-25 21:08:27 +0100 | [diff] [blame] | 1009 | unsigned long timeout; |
Peter Zijlstra | 6f505b1 | 2008-01-25 21:08:30 +0100 | [diff] [blame] | 1010 | int nr_cpus_allowed; |
| 1011 | |
Peter Zijlstra | 58d6c2d | 2008-04-19 19:45:00 +0200 | [diff] [blame] | 1012 | struct sched_rt_entity *back; |
Peter Zijlstra | 052f1dc | 2008-02-13 15:45:40 +0100 | [diff] [blame] | 1013 | #ifdef CONFIG_RT_GROUP_SCHED |
Peter Zijlstra | 6f505b1 | 2008-01-25 21:08:30 +0100 | [diff] [blame] | 1014 | struct sched_rt_entity *parent; |
| 1015 | /* rq on which this entity is (to be) queued: */ |
| 1016 | struct rt_rq *rt_rq; |
| 1017 | /* rq "owned" by this entity/group: */ |
| 1018 | struct rt_rq *my_q; |
| 1019 | #endif |
Peter Zijlstra | fa71706 | 2008-01-25 21:08:27 +0100 | [diff] [blame] | 1020 | }; |
| 1021 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | struct task_struct { |
| 1023 | volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ |
Roman Zippel | f7e4217 | 2007-05-09 02:35:17 -0700 | [diff] [blame] | 1024 | void *stack; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | atomic_t usage; |
William Cohen | 97dc32c | 2007-05-08 00:23:41 -0700 | [diff] [blame] | 1026 | unsigned int flags; /* per process flags, defined below */ |
| 1027 | unsigned int ptrace; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | |
Paolo 'Blaisorblade' Giarrusso | 3677209 | 2005-05-05 16:16:12 -0700 | [diff] [blame] | 1029 | int lock_depth; /* BKL lock depth */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | |
Peter Williams | 2dd73a4 | 2006-06-27 02:54:34 -0700 | [diff] [blame] | 1031 | #ifdef CONFIG_SMP |
| 1032 | #ifdef __ARCH_WANT_UNLOCKED_CTXSW |
Nick Piggin | 4866cde | 2005-06-25 14:57:23 -0700 | [diff] [blame] | 1033 | int oncpu; |
| 1034 | #endif |
Peter Williams | 2dd73a4 | 2006-06-27 02:54:34 -0700 | [diff] [blame] | 1035 | #endif |
Ingo Molnar | 50e645a | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 1036 | |
Ingo Molnar | b29739f | 2006-06-27 02:54:51 -0700 | [diff] [blame] | 1037 | int prio, static_prio, normal_prio; |
Richard Kennedy | c7aceab | 2008-05-15 12:09:15 +0100 | [diff] [blame] | 1038 | unsigned int rt_priority; |
Ingo Molnar | 5522d5d | 2007-10-15 17:00:12 +0200 | [diff] [blame] | 1039 | const struct sched_class *sched_class; |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 1040 | struct sched_entity se; |
Peter Zijlstra | fa71706 | 2008-01-25 21:08:27 +0100 | [diff] [blame] | 1041 | struct sched_rt_entity rt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | |
Avi Kivity | e107be3 | 2007-07-26 13:40:43 +0200 | [diff] [blame] | 1043 | #ifdef CONFIG_PREEMPT_NOTIFIERS |
| 1044 | /* list of struct preempt_notifier: */ |
| 1045 | struct hlist_head preempt_notifiers; |
| 1046 | #endif |
| 1047 | |
Alexey Dobriyan | 18796aa | 2007-10-16 23:30:26 -0700 | [diff] [blame] | 1048 | /* |
| 1049 | * fpu_counter contains the number of consecutive context switches |
| 1050 | * that the FPU is used. If this is over a threshold, the lazy fpu |
| 1051 | * saving becomes unlazy to save the trap. This is an unsigned char |
| 1052 | * so that after 256 times the counter wraps and the behavior turns |
| 1053 | * lazy again; this to deal with bursty apps that only use FPU for |
| 1054 | * a short time |
| 1055 | */ |
| 1056 | unsigned char fpu_counter; |
| 1057 | s8 oomkilladj; /* OOM kill score adjustment (bit shift). */ |
Alexey Dobriyan | 6c5c934 | 2006-09-29 01:59:40 -0700 | [diff] [blame] | 1058 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
Jens Axboe | 2056a78 | 2006-03-23 20:00:26 +0100 | [diff] [blame] | 1059 | unsigned int btrace_seq; |
Alexey Dobriyan | 6c5c934 | 2006-09-29 01:59:40 -0700 | [diff] [blame] | 1060 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1061 | |
William Cohen | 97dc32c | 2007-05-08 00:23:41 -0700 | [diff] [blame] | 1062 | unsigned int policy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1063 | cpumask_t cpus_allowed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1064 | |
Paul E. McKenney | e260be6 | 2008-01-25 21:08:24 +0100 | [diff] [blame] | 1065 | #ifdef CONFIG_PREEMPT_RCU |
| 1066 | int rcu_read_lock_nesting; |
| 1067 | int rcu_flipctr_idx; |
| 1068 | #endif /* #ifdef CONFIG_PREEMPT_RCU */ |
| 1069 | |
Chandra Seetharaman | 52f17b6 | 2006-07-14 00:24:38 -0700 | [diff] [blame] | 1070 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1071 | struct sched_info sched_info; |
| 1072 | #endif |
| 1073 | |
| 1074 | struct list_head tasks; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1075 | |
| 1076 | struct mm_struct *mm, *active_mm; |
| 1077 | |
| 1078 | /* task state */ |
| 1079 | struct linux_binfmt *binfmt; |
William Cohen | 97dc32c | 2007-05-08 00:23:41 -0700 | [diff] [blame] | 1080 | int exit_state; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1081 | int exit_code, exit_signal; |
| 1082 | int pdeath_signal; /* The signal sent when the parent dies */ |
| 1083 | /* ??? */ |
William Cohen | 97dc32c | 2007-05-08 00:23:41 -0700 | [diff] [blame] | 1084 | unsigned int personality; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | unsigned did_exec:1; |
| 1086 | pid_t pid; |
| 1087 | pid_t tgid; |
Arjan van de Ven | 0a425405 | 2006-09-26 10:52:38 +0200 | [diff] [blame] | 1088 | |
| 1089 | #ifdef CONFIG_CC_STACKPROTECTOR |
| 1090 | /* Canary value for the -fstack-protector gcc feature */ |
| 1091 | unsigned long stack_canary; |
| 1092 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1093 | /* |
| 1094 | * pointers to (original) parent process, youngest child, younger sibling, |
| 1095 | * older sibling, respectively. (p->father can be replaced with |
Roland McGrath | f470021 | 2008-03-24 18:36:23 -0700 | [diff] [blame] | 1096 | * p->real_parent->pid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1097 | */ |
Roland McGrath | f470021 | 2008-03-24 18:36:23 -0700 | [diff] [blame] | 1098 | struct task_struct *real_parent; /* real parent process */ |
| 1099 | struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | /* |
Roland McGrath | f470021 | 2008-03-24 18:36:23 -0700 | [diff] [blame] | 1101 | * children/sibling forms the list of my natural children |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1102 | */ |
| 1103 | struct list_head children; /* list of my children */ |
| 1104 | struct list_head sibling; /* linkage in my parent's children list */ |
| 1105 | struct task_struct *group_leader; /* threadgroup leader */ |
| 1106 | |
Roland McGrath | f470021 | 2008-03-24 18:36:23 -0700 | [diff] [blame] | 1107 | /* |
| 1108 | * ptraced is the list of tasks this task is using ptrace on. |
| 1109 | * This includes both natural children and PTRACE_ATTACH targets. |
| 1110 | * p->ptrace_entry is p's link on the p->parent->ptraced list. |
| 1111 | */ |
| 1112 | struct list_head ptraced; |
| 1113 | struct list_head ptrace_entry; |
| 1114 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1115 | /* PID/PID hash table linkage. */ |
Eric W. Biederman | 92476d7 | 2006-03-31 02:31:42 -0800 | [diff] [blame] | 1116 | struct pid_link pids[PIDTYPE_MAX]; |
Oleg Nesterov | 47e6532 | 2006-03-28 16:11:25 -0800 | [diff] [blame] | 1117 | struct list_head thread_group; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | |
| 1119 | struct completion *vfork_done; /* for vfork() */ |
| 1120 | int __user *set_child_tid; /* CLONE_CHILD_SETTID */ |
| 1121 | int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ |
| 1122 | |
Michael Neuling | c66f08b | 2007-10-18 03:06:34 -0700 | [diff] [blame] | 1123 | cputime_t utime, stime, utimescaled, stimescaled; |
Laurent Vivier | 9ac5231 | 2007-10-15 17:00:19 +0200 | [diff] [blame] | 1124 | cputime_t gtime; |
Balbir Singh | 9301899 | 2007-10-30 00:26:32 +0100 | [diff] [blame] | 1125 | cputime_t prev_utime, prev_stime; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1126 | unsigned long nvcsw, nivcsw; /* context switch counts */ |
Tomas Janousek | 924b42d | 2007-07-15 23:39:42 -0700 | [diff] [blame] | 1127 | struct timespec start_time; /* monotonic time */ |
| 1128 | struct timespec real_start_time; /* boot based time */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1129 | /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ |
| 1130 | unsigned long min_flt, maj_flt; |
| 1131 | |
| 1132 | cputime_t it_prof_expires, it_virt_expires; |
| 1133 | unsigned long long it_sched_expires; |
| 1134 | struct list_head cpu_timers[3]; |
| 1135 | |
| 1136 | /* process credentials */ |
| 1137 | uid_t uid,euid,suid,fsuid; |
| 1138 | gid_t gid,egid,sgid,fsgid; |
| 1139 | struct group_info *group_info; |
Serge E. Hallyn | 3b7391d | 2008-02-04 22:29:45 -0800 | [diff] [blame] | 1140 | kernel_cap_t cap_effective, cap_inheritable, cap_permitted, cap_bset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1141 | struct user_struct *user; |
Richard Kennedy | c7aceab | 2008-05-15 12:09:15 +0100 | [diff] [blame] | 1142 | unsigned securebits; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1143 | #ifdef CONFIG_KEYS |
Richard Kennedy | c7aceab | 2008-05-15 12:09:15 +0100 | [diff] [blame] | 1144 | unsigned char jit_keyring; /* default keyring to attach requested keys to */ |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 1145 | struct key *request_key_auth; /* assumed request_key authority */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1146 | struct key *thread_keyring; /* keyring private to this thread */ |
| 1147 | #endif |
Paolo 'Blaisorblade' Giarrusso | 3677209 | 2005-05-05 16:16:12 -0700 | [diff] [blame] | 1148 | char comm[TASK_COMM_LEN]; /* executable name excluding path |
| 1149 | - access with [gs]et_task_comm (which lock |
| 1150 | it with task_lock()) |
| 1151 | - initialized normally by flush_old_exec */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1152 | /* file system info */ |
| 1153 | int link_count, total_link_count; |
Alexey Dobriyan | 3d5b6fc | 2006-09-29 01:59:40 -0700 | [diff] [blame] | 1154 | #ifdef CONFIG_SYSVIPC |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | /* ipc stuff */ |
| 1156 | struct sysv_sem sysvsem; |
Alexey Dobriyan | 3d5b6fc | 2006-09-29 01:59:40 -0700 | [diff] [blame] | 1157 | #endif |
Ingo Molnar | 82a1fcb | 2008-01-25 21:08:02 +0100 | [diff] [blame] | 1158 | #ifdef CONFIG_DETECT_SOFTLOCKUP |
| 1159 | /* hung task detection */ |
| 1160 | unsigned long last_switch_timestamp; |
| 1161 | unsigned long last_switch_count; |
| 1162 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1163 | /* CPU-specific state of this task */ |
| 1164 | struct thread_struct thread; |
| 1165 | /* filesystem information */ |
| 1166 | struct fs_struct *fs; |
| 1167 | /* open file information */ |
| 1168 | struct files_struct *files; |
Serge E. Hallyn | 1651e14 | 2006-10-02 02:18:08 -0700 | [diff] [blame] | 1169 | /* namespaces */ |
Serge E. Hallyn | ab51601 | 2006-10-02 02:18:06 -0700 | [diff] [blame] | 1170 | struct nsproxy *nsproxy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1171 | /* signal handlers */ |
| 1172 | struct signal_struct *signal; |
| 1173 | struct sighand_struct *sighand; |
| 1174 | |
| 1175 | sigset_t blocked, real_blocked; |
Roland McGrath | f3de272 | 2008-04-30 00:53:09 -0700 | [diff] [blame] | 1176 | sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1177 | struct sigpending pending; |
| 1178 | |
| 1179 | unsigned long sas_ss_sp; |
| 1180 | size_t sas_ss_size; |
| 1181 | int (*notifier)(void *priv); |
| 1182 | void *notifier_data; |
| 1183 | sigset_t *notifier_mask; |
Alexey Dobriyan | 57c521c | 2007-10-16 23:31:35 -0700 | [diff] [blame] | 1184 | #ifdef CONFIG_SECURITY |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1185 | void *security; |
Alexey Dobriyan | 57c521c | 2007-10-16 23:31:35 -0700 | [diff] [blame] | 1186 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | struct audit_context *audit_context; |
Al Viro | bfef93a | 2008-01-10 04:53:18 -0500 | [diff] [blame] | 1188 | #ifdef CONFIG_AUDITSYSCALL |
| 1189 | uid_t loginuid; |
Eric Paris | 4746ec5 | 2008-01-08 10:06:53 -0500 | [diff] [blame] | 1190 | unsigned int sessionid; |
Al Viro | bfef93a | 2008-01-10 04:53:18 -0500 | [diff] [blame] | 1191 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1192 | seccomp_t seccomp; |
| 1193 | |
| 1194 | /* Thread group tracking */ |
| 1195 | u32 parent_exec_id; |
| 1196 | u32 self_exec_id; |
| 1197 | /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */ |
| 1198 | spinlock_t alloc_lock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1199 | |
Ingo Molnar | b29739f | 2006-06-27 02:54:51 -0700 | [diff] [blame] | 1200 | /* Protection of the PI data structures: */ |
| 1201 | spinlock_t pi_lock; |
| 1202 | |
Ingo Molnar | 23f78d4a | 2006-06-27 02:54:53 -0700 | [diff] [blame] | 1203 | #ifdef CONFIG_RT_MUTEXES |
| 1204 | /* PI waiters blocked on a rt_mutex held by this task */ |
| 1205 | struct plist_head pi_waiters; |
| 1206 | /* Deadlock detection and priority inheritance handling */ |
| 1207 | struct rt_mutex_waiter *pi_blocked_on; |
Ingo Molnar | 23f78d4a | 2006-06-27 02:54:53 -0700 | [diff] [blame] | 1208 | #endif |
| 1209 | |
Ingo Molnar | 408894e | 2006-01-09 15:59:20 -0800 | [diff] [blame] | 1210 | #ifdef CONFIG_DEBUG_MUTEXES |
| 1211 | /* mutex deadlock detection */ |
| 1212 | struct mutex_waiter *blocked_on; |
| 1213 | #endif |
Ingo Molnar | de30a2b | 2006-07-03 00:24:42 -0700 | [diff] [blame] | 1214 | #ifdef CONFIG_TRACE_IRQFLAGS |
| 1215 | unsigned int irq_events; |
| 1216 | int hardirqs_enabled; |
| 1217 | unsigned long hardirq_enable_ip; |
| 1218 | unsigned int hardirq_enable_event; |
| 1219 | unsigned long hardirq_disable_ip; |
| 1220 | unsigned int hardirq_disable_event; |
| 1221 | int softirqs_enabled; |
| 1222 | unsigned long softirq_disable_ip; |
| 1223 | unsigned int softirq_disable_event; |
| 1224 | unsigned long softirq_enable_ip; |
| 1225 | unsigned int softirq_enable_event; |
| 1226 | int hardirq_context; |
| 1227 | int softirq_context; |
| 1228 | #endif |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 1229 | #ifdef CONFIG_LOCKDEP |
Peter Zijlstra | bdb9441 | 2008-02-25 23:02:48 +0100 | [diff] [blame] | 1230 | # define MAX_LOCK_DEPTH 48UL |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 1231 | u64 curr_chain_key; |
| 1232 | int lockdep_depth; |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 1233 | unsigned int lockdep_recursion; |
Richard Kennedy | c7aceab | 2008-05-15 12:09:15 +0100 | [diff] [blame] | 1234 | struct held_lock held_locks[MAX_LOCK_DEPTH]; |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 1235 | #endif |
Ingo Molnar | 408894e | 2006-01-09 15:59:20 -0800 | [diff] [blame] | 1236 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1237 | /* journalling filesystem info */ |
| 1238 | void *journal_info; |
| 1239 | |
Neil Brown | d89d879 | 2007-05-01 09:53:42 +0200 | [diff] [blame] | 1240 | /* stacked block device info */ |
| 1241 | struct bio *bio_list, **bio_tail; |
| 1242 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1243 | /* VM state */ |
| 1244 | struct reclaim_state *reclaim_state; |
| 1245 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1246 | struct backing_dev_info *backing_dev_info; |
| 1247 | |
| 1248 | struct io_context *io_context; |
| 1249 | |
| 1250 | unsigned long ptrace_message; |
| 1251 | siginfo_t *last_siginfo; /* For ptrace use. */ |
Alexey Dobriyan | 4b98d11 | 2007-02-10 01:46:45 -0800 | [diff] [blame] | 1252 | #ifdef CONFIG_TASK_XACCT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1253 | /* i/o counters(bytes read/written, #syscalls */ |
| 1254 | u64 rchar, wchar, syscr, syscw; |
Alexey Dobriyan | 4b98d11 | 2007-02-10 01:46:45 -0800 | [diff] [blame] | 1255 | #endif |
Andrew Morton | 7c3ab73 | 2006-12-10 02:19:19 -0800 | [diff] [blame] | 1256 | struct task_io_accounting ioac; |
Jay Lan | 8f0ab51 | 2006-09-30 23:28:59 -0700 | [diff] [blame] | 1257 | #if defined(CONFIG_TASK_XACCT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1258 | u64 acct_rss_mem1; /* accumulated rss usage */ |
| 1259 | u64 acct_vm_mem1; /* accumulated virtual memory usage */ |
Jay Lan | db5fed26 | 2006-09-30 23:29:00 -0700 | [diff] [blame] | 1260 | cputime_t acct_stimexpd;/* stime since last update */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1261 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1262 | #ifdef CONFIG_CPUSETS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1263 | nodemask_t mems_allowed; |
| 1264 | int cpuset_mems_generation; |
Paul Jackson | 825a46a | 2006-03-24 03:16:03 -0800 | [diff] [blame] | 1265 | int cpuset_mem_spread_rotor; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1266 | #endif |
Paul Menage | ddbcc7e | 2007-10-18 23:39:30 -0700 | [diff] [blame] | 1267 | #ifdef CONFIG_CGROUPS |
Paul Menage | 817929e | 2007-10-18 23:39:36 -0700 | [diff] [blame] | 1268 | /* Control Group info protected by css_set_lock */ |
| 1269 | struct css_set *cgroups; |
| 1270 | /* cg_list protected by css_set_lock and tsk->alloc_lock */ |
| 1271 | struct list_head cg_list; |
Paul Menage | ddbcc7e | 2007-10-18 23:39:30 -0700 | [diff] [blame] | 1272 | #endif |
Alexey Dobriyan | 42b2dd0 | 2007-10-16 23:27:30 -0700 | [diff] [blame] | 1273 | #ifdef CONFIG_FUTEX |
Ingo Molnar | 0771dfe | 2006-03-27 01:16:22 -0800 | [diff] [blame] | 1274 | struct robust_list_head __user *robust_list; |
Ingo Molnar | 34f192c | 2006-03-27 01:16:24 -0800 | [diff] [blame] | 1275 | #ifdef CONFIG_COMPAT |
| 1276 | struct compat_robust_list_head __user *compat_robust_list; |
| 1277 | #endif |
Ingo Molnar | c87e283 | 2006-06-27 02:54:58 -0700 | [diff] [blame] | 1278 | struct list_head pi_state_list; |
| 1279 | struct futex_pi_state *pi_state_cache; |
Alexey Dobriyan | 42b2dd0 | 2007-10-16 23:27:30 -0700 | [diff] [blame] | 1280 | #endif |
Richard Kennedy | c7aceab | 2008-05-15 12:09:15 +0100 | [diff] [blame] | 1281 | #ifdef CONFIG_NUMA |
| 1282 | struct mempolicy *mempolicy; |
| 1283 | short il_next; |
| 1284 | #endif |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 1285 | atomic_t fs_excl; /* holding fs exclusive resources */ |
Ingo Molnar | e56d090 | 2006-01-08 01:01:37 -0800 | [diff] [blame] | 1286 | struct rcu_head rcu; |
Jens Axboe | b92ce55 | 2006-04-11 13:52:07 +0200 | [diff] [blame] | 1287 | |
| 1288 | /* |
| 1289 | * cache last used pipe for splice |
| 1290 | */ |
| 1291 | struct pipe_inode_info *splice_pipe; |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 1292 | #ifdef CONFIG_TASK_DELAY_ACCT |
| 1293 | struct task_delay_info *delays; |
| 1294 | #endif |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1295 | #ifdef CONFIG_FAULT_INJECTION |
| 1296 | int make_it_fail; |
| 1297 | #endif |
Peter Zijlstra | 3e26c14 | 2007-10-16 23:25:50 -0700 | [diff] [blame] | 1298 | struct prop_local_single dirties; |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 1299 | #ifdef CONFIG_LATENCYTOP |
| 1300 | int latency_record_count; |
| 1301 | struct latency_record latency_record[LT_SAVECOUNT]; |
| 1302 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1303 | }; |
| 1304 | |
Ingo Molnar | e05606d | 2007-07-09 18:51:59 +0200 | [diff] [blame] | 1305 | /* |
| 1306 | * Priority of a process goes from 0..MAX_PRIO-1, valid RT |
| 1307 | * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH |
| 1308 | * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority |
| 1309 | * values are inverted: lower p->prio value means higher priority. |
| 1310 | * |
| 1311 | * The MAX_USER_RT_PRIO value allows the actual maximum |
| 1312 | * RT priority to be separate from the value exported to |
| 1313 | * user-space. This allows kernel threads to set their |
| 1314 | * priority to a value higher than any user task. Note: |
| 1315 | * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. |
| 1316 | */ |
| 1317 | |
| 1318 | #define MAX_USER_RT_PRIO 100 |
| 1319 | #define MAX_RT_PRIO MAX_USER_RT_PRIO |
| 1320 | |
| 1321 | #define MAX_PRIO (MAX_RT_PRIO + 40) |
| 1322 | #define DEFAULT_PRIO (MAX_RT_PRIO + 20) |
| 1323 | |
| 1324 | static inline int rt_prio(int prio) |
| 1325 | { |
| 1326 | if (unlikely(prio < MAX_RT_PRIO)) |
| 1327 | return 1; |
| 1328 | return 0; |
| 1329 | } |
| 1330 | |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 1331 | static inline int rt_task(struct task_struct *p) |
Ingo Molnar | e05606d | 2007-07-09 18:51:59 +0200 | [diff] [blame] | 1332 | { |
| 1333 | return rt_prio(p->prio); |
| 1334 | } |
| 1335 | |
Pavel Emelianov | a47afb0 | 2007-10-18 23:39:46 -0700 | [diff] [blame] | 1336 | static inline void set_task_session(struct task_struct *tsk, pid_t session) |
Cedric Le Goater | 937949d | 2006-12-08 02:37:54 -0800 | [diff] [blame] | 1337 | { |
Pavel Emelianov | a47afb0 | 2007-10-18 23:39:46 -0700 | [diff] [blame] | 1338 | tsk->signal->__session = session; |
Cedric Le Goater | 937949d | 2006-12-08 02:37:54 -0800 | [diff] [blame] | 1339 | } |
| 1340 | |
Pavel Emelyanov | 9a2e705 | 2007-10-18 23:40:39 -0700 | [diff] [blame] | 1341 | static inline void set_task_pgrp(struct task_struct *tsk, pid_t pgrp) |
| 1342 | { |
| 1343 | tsk->signal->__pgrp = pgrp; |
| 1344 | } |
| 1345 | |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 1346 | static inline struct pid *task_pid(struct task_struct *task) |
Eric W. Biederman | 22c935f | 2006-10-02 02:17:09 -0700 | [diff] [blame] | 1347 | { |
| 1348 | return task->pids[PIDTYPE_PID].pid; |
| 1349 | } |
| 1350 | |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 1351 | static inline struct pid *task_tgid(struct task_struct *task) |
Eric W. Biederman | 22c935f | 2006-10-02 02:17:09 -0700 | [diff] [blame] | 1352 | { |
| 1353 | return task->group_leader->pids[PIDTYPE_PID].pid; |
| 1354 | } |
| 1355 | |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 1356 | static inline struct pid *task_pgrp(struct task_struct *task) |
Eric W. Biederman | 22c935f | 2006-10-02 02:17:09 -0700 | [diff] [blame] | 1357 | { |
| 1358 | return task->group_leader->pids[PIDTYPE_PGID].pid; |
| 1359 | } |
| 1360 | |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 1361 | static inline struct pid *task_session(struct task_struct *task) |
Eric W. Biederman | 22c935f | 2006-10-02 02:17:09 -0700 | [diff] [blame] | 1362 | { |
| 1363 | return task->group_leader->pids[PIDTYPE_SID].pid; |
| 1364 | } |
| 1365 | |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1366 | struct pid_namespace; |
| 1367 | |
| 1368 | /* |
| 1369 | * the helpers to get the task's different pids as they are seen |
| 1370 | * from various namespaces |
| 1371 | * |
| 1372 | * 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] | 1373 | * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of |
| 1374 | * current. |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1375 | * task_xid_nr_ns() : id seen from the ns specified; |
| 1376 | * |
| 1377 | * set_task_vxid() : assigns a virtual id to a task; |
| 1378 | * |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1379 | * see also pid_nr() etc in include/linux/pid.h |
| 1380 | */ |
| 1381 | |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 1382 | static inline pid_t task_pid_nr(struct task_struct *tsk) |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1383 | { |
| 1384 | return tsk->pid; |
| 1385 | } |
| 1386 | |
Pavel Emelyanov | 2f2a3a4 | 2007-10-18 23:40:19 -0700 | [diff] [blame] | 1387 | pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1388 | |
| 1389 | static inline pid_t task_pid_vnr(struct task_struct *tsk) |
| 1390 | { |
| 1391 | return pid_vnr(task_pid(tsk)); |
| 1392 | } |
| 1393 | |
| 1394 | |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 1395 | static inline pid_t task_tgid_nr(struct task_struct *tsk) |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1396 | { |
| 1397 | return tsk->tgid; |
| 1398 | } |
| 1399 | |
Pavel Emelyanov | 2f2a3a4 | 2007-10-18 23:40:19 -0700 | [diff] [blame] | 1400 | 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] | 1401 | |
| 1402 | static inline pid_t task_tgid_vnr(struct task_struct *tsk) |
| 1403 | { |
| 1404 | return pid_vnr(task_tgid(tsk)); |
| 1405 | } |
| 1406 | |
| 1407 | |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 1408 | static inline pid_t task_pgrp_nr(struct task_struct *tsk) |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1409 | { |
Pavel Emelyanov | 9a2e705 | 2007-10-18 23:40:39 -0700 | [diff] [blame] | 1410 | return tsk->signal->__pgrp; |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1411 | } |
| 1412 | |
Pavel Emelyanov | 2f2a3a4 | 2007-10-18 23:40:19 -0700 | [diff] [blame] | 1413 | pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1414 | |
| 1415 | static inline pid_t task_pgrp_vnr(struct task_struct *tsk) |
| 1416 | { |
| 1417 | return pid_vnr(task_pgrp(tsk)); |
| 1418 | } |
| 1419 | |
| 1420 | |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 1421 | static inline pid_t task_session_nr(struct task_struct *tsk) |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1422 | { |
| 1423 | return tsk->signal->__session; |
| 1424 | } |
| 1425 | |
Pavel Emelyanov | 2f2a3a4 | 2007-10-18 23:40:19 -0700 | [diff] [blame] | 1426 | pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); |
Pavel Emelyanov | 7af5729 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1427 | |
| 1428 | static inline pid_t task_session_vnr(struct task_struct *tsk) |
| 1429 | { |
| 1430 | return pid_vnr(task_session(tsk)); |
| 1431 | } |
| 1432 | |
| 1433 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1434 | /** |
| 1435 | * pid_alive - check that a task structure is not stale |
| 1436 | * @p: Task structure to be checked. |
| 1437 | * |
| 1438 | * Test if a process is not yet dead (at most zombie state) |
| 1439 | * If pid_alive fails, then pointers within the task structure |
| 1440 | * can be stale and must not be dereferenced. |
| 1441 | */ |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 1442 | static inline int pid_alive(struct task_struct *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1443 | { |
Eric W. Biederman | 92476d7 | 2006-03-31 02:31:42 -0800 | [diff] [blame] | 1444 | return p->pids[PIDTYPE_PID].pid != NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1445 | } |
| 1446 | |
Sukadev Bhattiprolu | f400e19 | 2006-09-29 02:00:07 -0700 | [diff] [blame] | 1447 | /** |
Serge E. Hallyn | b460cbc | 2007-10-18 23:39:52 -0700 | [diff] [blame] | 1448 | * is_global_init - check if a task structure is init |
Henne | 3260259 | 2006-10-06 00:44:01 -0700 | [diff] [blame] | 1449 | * @tsk: Task structure to be checked. |
| 1450 | * |
| 1451 | * 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] | 1452 | */ |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 1453 | static inline int is_global_init(struct task_struct *tsk) |
Pavel Emelyanov | b461cc0 | 2007-10-18 23:40:09 -0700 | [diff] [blame] | 1454 | { |
| 1455 | return tsk->pid == 1; |
| 1456 | } |
Serge E. Hallyn | b460cbc | 2007-10-18 23:39:52 -0700 | [diff] [blame] | 1457 | |
| 1458 | /* |
| 1459 | * is_container_init: |
| 1460 | * check whether in the task is init in its own pid namespace. |
| 1461 | */ |
Pavel Emelyanov | b461cc0 | 2007-10-18 23:40:09 -0700 | [diff] [blame] | 1462 | extern int is_container_init(struct task_struct *tsk); |
Sukadev Bhattiprolu | f400e19 | 2006-09-29 02:00:07 -0700 | [diff] [blame] | 1463 | |
Cedric Le Goater | 9ec5209 | 2006-10-02 02:19:00 -0700 | [diff] [blame] | 1464 | extern struct pid *cad_pid; |
| 1465 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1466 | extern void free_task(struct task_struct *tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1467 | #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) |
Ingo Molnar | e56d090 | 2006-01-08 01:01:37 -0800 | [diff] [blame] | 1468 | |
Andrew Morton | 158d9eb | 2006-03-31 02:31:34 -0800 | [diff] [blame] | 1469 | extern void __put_task_struct(struct task_struct *t); |
Ingo Molnar | e56d090 | 2006-01-08 01:01:37 -0800 | [diff] [blame] | 1470 | |
| 1471 | static inline void put_task_struct(struct task_struct *t) |
| 1472 | { |
| 1473 | if (atomic_dec_and_test(&t->usage)) |
Eric W. Biederman | 8c7904a | 2006-03-31 02:31:37 -0800 | [diff] [blame] | 1474 | __put_task_struct(t); |
Ingo Molnar | e56d090 | 2006-01-08 01:01:37 -0800 | [diff] [blame] | 1475 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1476 | |
| 1477 | /* |
| 1478 | * Per process flags |
| 1479 | */ |
| 1480 | #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */ |
| 1481 | /* Not implemented yet, only for 486*/ |
| 1482 | #define PF_STARTING 0x00000002 /* being created */ |
| 1483 | #define PF_EXITING 0x00000004 /* getting shut down */ |
Alexey Kuznetsov | 778e9a9 | 2007-06-08 13:47:00 -0700 | [diff] [blame] | 1484 | #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ |
Laurent Vivier | 94886b8 | 2007-10-15 17:00:19 +0200 | [diff] [blame] | 1485 | #define PF_VCPU 0x00000010 /* I'm a virtual CPU */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1486 | #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ |
| 1487 | #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ |
| 1488 | #define PF_DUMPCORE 0x00000200 /* dumped core */ |
| 1489 | #define PF_SIGNALED 0x00000400 /* killed by a signal */ |
| 1490 | #define PF_MEMALLOC 0x00000800 /* Allocating memory */ |
| 1491 | #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */ |
| 1492 | #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1493 | #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ |
| 1494 | #define PF_FROZEN 0x00010000 /* frozen for system suspend */ |
| 1495 | #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ |
| 1496 | #define PF_KSWAPD 0x00040000 /* I am kswapd */ |
| 1497 | #define PF_SWAPOFF 0x00080000 /* I am in swapoff */ |
| 1498 | #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ |
Oleg Nesterov | 246bb0b | 2008-07-25 01:47:38 -0700 | [diff] [blame] | 1499 | #define PF_KTHREAD 0x00200000 /* I am a kernel thread */ |
Jens Axboe | b31dc66 | 2006-06-13 08:26:10 +0200 | [diff] [blame] | 1500 | #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ |
| 1501 | #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ |
| 1502 | #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */ |
| 1503 | #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */ |
David Rientjes | 9985b0b | 2008-06-05 12:57:11 -0700 | [diff] [blame] | 1504 | #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */ |
Paul Jackson | c61afb1 | 2006-03-24 03:16:08 -0800 | [diff] [blame] | 1505 | #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */ |
Thomas Gleixner | 61a8712 | 2006-06-27 02:54:56 -0700 | [diff] [blame] | 1506 | #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ |
Rafael J. Wysocki | ba96a0c | 2007-05-23 13:57:25 -0700 | [diff] [blame] | 1507 | #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */ |
Rafael J. Wysocki | ebb12db | 2008-06-11 22:04:29 +0200 | [diff] [blame] | 1508 | #define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1509 | |
| 1510 | /* |
| 1511 | * Only the _current_ task can read/write to tsk->flags, but other |
| 1512 | * tasks can access tsk->flags in readonly mode for example |
| 1513 | * with tsk_used_math (like during threaded core dumping). |
| 1514 | * There is however an exception to this rule during ptrace |
| 1515 | * or during fork: the ptracer task is allowed to write to the |
| 1516 | * child->flags of its traced child (same goes for fork, the parent |
| 1517 | * can write to the child->flags), because we're guaranteed the |
| 1518 | * child is not running and in turn not changing child->flags |
| 1519 | * at the same time the parent does it. |
| 1520 | */ |
| 1521 | #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) |
| 1522 | #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) |
| 1523 | #define clear_used_math() clear_stopped_child_used_math(current) |
| 1524 | #define set_used_math() set_stopped_child_used_math(current) |
| 1525 | #define conditional_stopped_child_used_math(condition, child) \ |
| 1526 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) |
| 1527 | #define conditional_used_math(condition) \ |
| 1528 | conditional_stopped_child_used_math(condition, current) |
| 1529 | #define copy_to_stopped_child_used_math(child) \ |
| 1530 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) |
| 1531 | /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ |
| 1532 | #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) |
| 1533 | #define used_math() tsk_used_math(current) |
| 1534 | |
| 1535 | #ifdef CONFIG_SMP |
Mike Travis | cd8ba7c | 2008-03-26 14:23:49 -0700 | [diff] [blame] | 1536 | extern int set_cpus_allowed_ptr(struct task_struct *p, |
| 1537 | const cpumask_t *new_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1538 | #else |
Mike Travis | cd8ba7c | 2008-03-26 14:23:49 -0700 | [diff] [blame] | 1539 | static inline int set_cpus_allowed_ptr(struct task_struct *p, |
| 1540 | const cpumask_t *new_mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1541 | { |
Mike Travis | cd8ba7c | 2008-03-26 14:23:49 -0700 | [diff] [blame] | 1542 | if (!cpu_isset(0, *new_mask)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1543 | return -EINVAL; |
| 1544 | return 0; |
| 1545 | } |
| 1546 | #endif |
Mike Travis | cd8ba7c | 2008-03-26 14:23:49 -0700 | [diff] [blame] | 1547 | static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) |
| 1548 | { |
| 1549 | return set_cpus_allowed_ptr(p, &new_mask); |
| 1550 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1551 | |
| 1552 | extern unsigned long long sched_clock(void); |
Ingo Molnar | e436d80 | 2007-07-19 21:28:35 +0200 | [diff] [blame] | 1553 | |
Peter Zijlstra | 3e51f33 | 2008-05-03 18:29:28 +0200 | [diff] [blame] | 1554 | #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK |
| 1555 | static inline void sched_clock_init(void) |
| 1556 | { |
| 1557 | } |
| 1558 | |
| 1559 | static inline u64 sched_clock_cpu(int cpu) |
| 1560 | { |
| 1561 | return sched_clock(); |
| 1562 | } |
| 1563 | |
| 1564 | static inline void sched_clock_tick(void) |
| 1565 | { |
| 1566 | } |
| 1567 | |
| 1568 | static inline void sched_clock_idle_sleep_event(void) |
| 1569 | { |
| 1570 | } |
| 1571 | |
| 1572 | static inline void sched_clock_idle_wakeup_event(u64 delta_ns) |
| 1573 | { |
| 1574 | } |
Steven Rostedt | af52a90 | 2008-07-07 14:16:52 -0400 | [diff] [blame] | 1575 | |
| 1576 | #ifdef CONFIG_NO_HZ |
| 1577 | static inline void sched_clock_tick_stop(int cpu) |
| 1578 | { |
| 1579 | } |
| 1580 | |
| 1581 | static inline void sched_clock_tick_start(int cpu) |
| 1582 | { |
| 1583 | } |
| 1584 | #endif |
| 1585 | |
| 1586 | #else /* CONFIG_HAVE_UNSTABLE_SCHED_CLOCK */ |
Peter Zijlstra | 3e51f33 | 2008-05-03 18:29:28 +0200 | [diff] [blame] | 1587 | extern void sched_clock_init(void); |
| 1588 | extern u64 sched_clock_cpu(int cpu); |
| 1589 | extern void sched_clock_tick(void); |
| 1590 | extern void sched_clock_idle_sleep_event(void); |
| 1591 | extern void sched_clock_idle_wakeup_event(u64 delta_ns); |
Steven Rostedt | af52a90 | 2008-07-07 14:16:52 -0400 | [diff] [blame] | 1592 | #ifdef CONFIG_NO_HZ |
| 1593 | extern void sched_clock_tick_stop(int cpu); |
| 1594 | extern void sched_clock_tick_start(int cpu); |
Peter Zijlstra | 3e51f33 | 2008-05-03 18:29:28 +0200 | [diff] [blame] | 1595 | #endif |
Steven Rostedt | af52a90 | 2008-07-07 14:16:52 -0400 | [diff] [blame] | 1596 | #endif /* CONFIG_HAVE_UNSTABLE_SCHED_CLOCK */ |
Peter Zijlstra | 3e51f33 | 2008-05-03 18:29:28 +0200 | [diff] [blame] | 1597 | |
Ingo Molnar | e436d80 | 2007-07-19 21:28:35 +0200 | [diff] [blame] | 1598 | /* |
| 1599 | * For kernel-internal use: high-speed (but slightly incorrect) per-cpu |
| 1600 | * clock constructed from sched_clock(): |
| 1601 | */ |
| 1602 | extern unsigned long long cpu_clock(int cpu); |
| 1603 | |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 1604 | extern unsigned long long |
Ingo Molnar | 41b86e9 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 1605 | task_sched_runtime(struct task_struct *task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1606 | |
| 1607 | /* sched_exec is called by processes performing an exec */ |
| 1608 | #ifdef CONFIG_SMP |
| 1609 | extern void sched_exec(void); |
| 1610 | #else |
| 1611 | #define sched_exec() {} |
| 1612 | #endif |
| 1613 | |
Ingo Molnar | 2aa44d0 | 2007-08-23 15:18:02 +0200 | [diff] [blame] | 1614 | extern void sched_clock_idle_sleep_event(void); |
| 1615 | extern void sched_clock_idle_wakeup_event(u64 delta_ns); |
Ingo Molnar | bb29ab2 | 2007-07-09 18:51:59 +0200 | [diff] [blame] | 1616 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1617 | #ifdef CONFIG_HOTPLUG_CPU |
| 1618 | extern void idle_task_exit(void); |
| 1619 | #else |
| 1620 | static inline void idle_task_exit(void) {} |
| 1621 | #endif |
| 1622 | |
| 1623 | extern void sched_idle_next(void); |
Ingo Molnar | b29739f | 2006-06-27 02:54:51 -0700 | [diff] [blame] | 1624 | |
Thomas Gleixner | 06d8308 | 2008-03-22 09:20:24 +0100 | [diff] [blame] | 1625 | #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP) |
| 1626 | extern void wake_up_idle_cpu(int cpu); |
| 1627 | #else |
| 1628 | static inline void wake_up_idle_cpu(int cpu) { } |
| 1629 | #endif |
| 1630 | |
Ingo Molnar | 2bd8e6d | 2007-10-15 17:00:02 +0200 | [diff] [blame] | 1631 | #ifdef CONFIG_SCHED_DEBUG |
Peter Zijlstra | 2180508 | 2007-08-25 18:41:53 +0200 | [diff] [blame] | 1632 | extern unsigned int sysctl_sched_latency; |
Peter Zijlstra | b2be5e9 | 2007-11-09 22:39:37 +0100 | [diff] [blame] | 1633 | extern unsigned int sysctl_sched_min_granularity; |
Ingo Molnar | bf0f6f2 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 1634 | extern unsigned int sysctl_sched_wakeup_granularity; |
Ingo Molnar | bf0f6f2 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 1635 | extern unsigned int sysctl_sched_child_runs_first; |
| 1636 | extern unsigned int sysctl_sched_features; |
Ingo Molnar | da84d96 | 2007-10-15 17:00:18 +0200 | [diff] [blame] | 1637 | extern unsigned int sysctl_sched_migration_cost; |
Peter Zijlstra | b82d9fd | 2007-11-09 22:39:39 +0100 | [diff] [blame] | 1638 | extern unsigned int sysctl_sched_nr_migrate; |
Peter Zijlstra | 2398f2c | 2008-06-27 13:41:35 +0200 | [diff] [blame] | 1639 | extern unsigned int sysctl_sched_shares_ratelimit; |
Peter Zijlstra | b2be5e9 | 2007-11-09 22:39:37 +0100 | [diff] [blame] | 1640 | |
| 1641 | int sched_nr_latency_handler(struct ctl_table *table, int write, |
| 1642 | struct file *file, void __user *buffer, size_t *length, |
| 1643 | loff_t *ppos); |
Ingo Molnar | 2bd8e6d | 2007-10-15 17:00:02 +0200 | [diff] [blame] | 1644 | #endif |
Peter Zijlstra | 9f0c1e5 | 2008-02-13 15:45:39 +0100 | [diff] [blame] | 1645 | extern unsigned int sysctl_sched_rt_period; |
| 1646 | extern int sysctl_sched_rt_runtime; |
Ingo Molnar | 2bd8e6d | 2007-10-15 17:00:02 +0200 | [diff] [blame] | 1647 | |
Peter Zijlstra | d0b27fa | 2008-04-19 19:44:57 +0200 | [diff] [blame] | 1648 | int sched_rt_handler(struct ctl_table *table, int write, |
| 1649 | struct file *filp, void __user *buffer, size_t *lenp, |
| 1650 | loff_t *ppos); |
| 1651 | |
Ingo Molnar | 2bd8e6d | 2007-10-15 17:00:02 +0200 | [diff] [blame] | 1652 | extern unsigned int sysctl_sched_compat_yield; |
Ingo Molnar | bf0f6f2 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 1653 | |
Ingo Molnar | b29739f | 2006-06-27 02:54:51 -0700 | [diff] [blame] | 1654 | #ifdef CONFIG_RT_MUTEXES |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 1655 | extern int rt_mutex_getprio(struct task_struct *p); |
| 1656 | extern void rt_mutex_setprio(struct task_struct *p, int prio); |
| 1657 | extern void rt_mutex_adjust_pi(struct task_struct *p); |
Ingo Molnar | b29739f | 2006-06-27 02:54:51 -0700 | [diff] [blame] | 1658 | #else |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 1659 | static inline int rt_mutex_getprio(struct task_struct *p) |
Ingo Molnar | b29739f | 2006-06-27 02:54:51 -0700 | [diff] [blame] | 1660 | { |
| 1661 | return p->normal_prio; |
| 1662 | } |
Thomas Gleixner | 95e02ca | 2006-06-27 02:55:02 -0700 | [diff] [blame] | 1663 | # define rt_mutex_adjust_pi(p) do { } while (0) |
Ingo Molnar | b29739f | 2006-06-27 02:54:51 -0700 | [diff] [blame] | 1664 | #endif |
| 1665 | |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 1666 | extern void set_user_nice(struct task_struct *p, long nice); |
| 1667 | extern int task_prio(const struct task_struct *p); |
| 1668 | extern int task_nice(const struct task_struct *p); |
| 1669 | extern int can_nice(const struct task_struct *p, const int nice); |
| 1670 | extern int task_curr(const struct task_struct *p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1671 | extern int idle_cpu(int cpu); |
| 1672 | extern int sched_setscheduler(struct task_struct *, int, struct sched_param *); |
Rusty Russell | 961ccdd | 2008-06-23 13:55:38 +1000 | [diff] [blame] | 1673 | extern int sched_setscheduler_nocheck(struct task_struct *, int, |
| 1674 | struct sched_param *); |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 1675 | extern struct task_struct *idle_task(int cpu); |
| 1676 | extern struct task_struct *curr_task(int cpu); |
| 1677 | extern void set_curr_task(int cpu, struct task_struct *p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1678 | |
| 1679 | void yield(void); |
| 1680 | |
| 1681 | /* |
| 1682 | * The default (Linux) execution domain. |
| 1683 | */ |
| 1684 | extern struct exec_domain default_exec_domain; |
| 1685 | |
| 1686 | union thread_union { |
| 1687 | struct thread_info thread_info; |
| 1688 | unsigned long stack[THREAD_SIZE/sizeof(long)]; |
| 1689 | }; |
| 1690 | |
| 1691 | #ifndef __HAVE_ARCH_KSTACK_END |
| 1692 | static inline int kstack_end(void *addr) |
| 1693 | { |
| 1694 | /* Reliable end of stack detection: |
| 1695 | * Some APM bios versions misalign the stack |
| 1696 | */ |
| 1697 | return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); |
| 1698 | } |
| 1699 | #endif |
| 1700 | |
| 1701 | extern union thread_union init_thread_union; |
| 1702 | extern struct task_struct init_task; |
| 1703 | |
| 1704 | extern struct mm_struct init_mm; |
| 1705 | |
Pavel Emelyanov | 198fe21 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1706 | extern struct pid_namespace init_pid_ns; |
| 1707 | |
| 1708 | /* |
| 1709 | * find a task by one of its numerical ids |
| 1710 | * |
| 1711 | * find_task_by_pid_type_ns(): |
| 1712 | * it is the most generic call - it finds a task by all id, |
| 1713 | * type and namespace specified |
| 1714 | * find_task_by_pid_ns(): |
| 1715 | * finds a task by its pid in the specified namespace |
Pavel Emelyanov | 228ebcb | 2007-10-18 23:40:16 -0700 | [diff] [blame] | 1716 | * find_task_by_vpid(): |
| 1717 | * finds a task by its virtual pid |
Pavel Emelyanov | 198fe21 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1718 | * find_task_by_pid(): |
| 1719 | * finds a task by its global pid |
| 1720 | * |
Pavel Emelyanov | e49859e | 2008-07-25 01:48:36 -0700 | [diff] [blame^] | 1721 | * see also find_vpid() etc in include/linux/pid.h |
Pavel Emelyanov | 198fe21 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1722 | */ |
| 1723 | |
| 1724 | extern struct task_struct *find_task_by_pid_type_ns(int type, int pid, |
| 1725 | struct pid_namespace *ns); |
| 1726 | |
Pavel Emelyanov | 5cd2045 | 2008-04-30 00:54:24 -0700 | [diff] [blame] | 1727 | static inline struct task_struct *__deprecated find_task_by_pid(pid_t nr) |
| 1728 | { |
| 1729 | return find_task_by_pid_type_ns(PIDTYPE_PID, nr, &init_pid_ns); |
| 1730 | } |
Pavel Emelyanov | 228ebcb | 2007-10-18 23:40:16 -0700 | [diff] [blame] | 1731 | extern struct task_struct *find_task_by_vpid(pid_t nr); |
| 1732 | extern struct task_struct *find_task_by_pid_ns(pid_t nr, |
| 1733 | struct pid_namespace *ns); |
Pavel Emelyanov | 198fe21 | 2007-10-18 23:40:06 -0700 | [diff] [blame] | 1734 | |
Oleg Nesterov | 8520d7c | 2008-02-08 04:19:09 -0800 | [diff] [blame] | 1735 | extern void __set_special_pids(struct pid *pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1736 | |
| 1737 | /* per-UID process charging. */ |
Cedric Le Goater | acce292 | 2007-07-15 23:40:59 -0700 | [diff] [blame] | 1738 | extern struct user_struct * alloc_uid(struct user_namespace *, uid_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1739 | static inline struct user_struct *get_uid(struct user_struct *u) |
| 1740 | { |
| 1741 | atomic_inc(&u->__count); |
| 1742 | return u; |
| 1743 | } |
| 1744 | extern void free_uid(struct user_struct *); |
| 1745 | extern void switch_uid(struct user_struct *); |
Pavel Emelyanov | 28f300d | 2007-09-18 22:46:45 -0700 | [diff] [blame] | 1746 | extern void release_uids(struct user_namespace *ns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1747 | |
| 1748 | #include <asm/current.h> |
| 1749 | |
Atsushi Nemoto | 3171a03 | 2006-09-29 02:00:32 -0700 | [diff] [blame] | 1750 | extern void do_timer(unsigned long ticks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1751 | |
Harvey Harrison | b3c9752 | 2008-02-13 15:03:15 -0800 | [diff] [blame] | 1752 | extern int wake_up_state(struct task_struct *tsk, unsigned int state); |
| 1753 | extern int wake_up_process(struct task_struct *tsk); |
| 1754 | extern void wake_up_new_task(struct task_struct *tsk, |
| 1755 | unsigned long clone_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1756 | #ifdef CONFIG_SMP |
| 1757 | extern void kick_process(struct task_struct *tsk); |
| 1758 | #else |
| 1759 | static inline void kick_process(struct task_struct *tsk) { } |
| 1760 | #endif |
Ingo Molnar | ad46c2c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 1761 | extern void sched_fork(struct task_struct *p, int clone_flags); |
| 1762 | extern void sched_dead(struct task_struct *p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1763 | |
| 1764 | extern int in_group_p(gid_t); |
| 1765 | extern int in_egroup_p(gid_t); |
| 1766 | |
| 1767 | extern void proc_caches_init(void); |
| 1768 | extern void flush_signals(struct task_struct *); |
Oleg Nesterov | 10ab825 | 2007-05-09 02:34:37 -0700 | [diff] [blame] | 1769 | extern void ignore_signals(struct task_struct *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1770 | extern void flush_signal_handlers(struct task_struct *, int force_default); |
| 1771 | extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); |
| 1772 | |
| 1773 | static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) |
| 1774 | { |
| 1775 | unsigned long flags; |
| 1776 | int ret; |
| 1777 | |
| 1778 | spin_lock_irqsave(&tsk->sighand->siglock, flags); |
| 1779 | ret = dequeue_signal(tsk, mask, info); |
| 1780 | spin_unlock_irqrestore(&tsk->sighand->siglock, flags); |
| 1781 | |
| 1782 | return ret; |
| 1783 | } |
| 1784 | |
| 1785 | extern void block_all_signals(int (*notifier)(void *priv), void *priv, |
| 1786 | sigset_t *mask); |
| 1787 | extern void unblock_all_signals(void); |
| 1788 | extern void release_task(struct task_struct * p); |
| 1789 | extern int send_sig_info(int, struct siginfo *, struct task_struct *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1790 | extern int force_sigsegv(int, struct task_struct *); |
| 1791 | extern int force_sig_info(int, struct siginfo *, struct task_struct *); |
Eric W. Biederman | c4b92fc | 2006-10-02 02:17:10 -0700 | [diff] [blame] | 1792 | 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] | 1793 | 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] | 1794 | 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] | 1795 | extern int kill_pgrp(struct pid *pid, int sig, int priv); |
| 1796 | extern int kill_pid(struct pid *pid, int sig, int priv); |
Matthew Wilcox | c3de4b3 | 2007-02-09 08:11:47 -0700 | [diff] [blame] | 1797 | extern int kill_proc_info(int, struct siginfo *, pid_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1798 | extern void do_notify_parent(struct task_struct *, int); |
| 1799 | extern void force_sig(int, struct task_struct *); |
| 1800 | extern void force_sig_specific(int, struct task_struct *); |
| 1801 | extern int send_sig(int, struct task_struct *, int); |
| 1802 | extern void zap_other_threads(struct task_struct *p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1803 | extern struct sigqueue *sigqueue_alloc(void); |
| 1804 | extern void sigqueue_free(struct sigqueue *); |
Oleg Nesterov | ac5c215 | 2008-04-30 00:52:57 -0700 | [diff] [blame] | 1805 | extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group); |
Oleg Nesterov | 9ac95f2 | 2006-02-09 22:41:50 +0300 | [diff] [blame] | 1806 | extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1807 | extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); |
| 1808 | |
Cedric Le Goater | 9ec5209 | 2006-10-02 02:19:00 -0700 | [diff] [blame] | 1809 | static inline int kill_cad_pid(int sig, int priv) |
| 1810 | { |
| 1811 | return kill_pid(cad_pid, sig, priv); |
| 1812 | } |
| 1813 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1814 | /* These can be the second arg to send_sig_info/send_group_sig_info. */ |
| 1815 | #define SEND_SIG_NOINFO ((struct siginfo *) 0) |
| 1816 | #define SEND_SIG_PRIV ((struct siginfo *) 1) |
| 1817 | #define SEND_SIG_FORCED ((struct siginfo *) 2) |
| 1818 | |
Oleg Nesterov | 621d312 | 2005-10-30 15:03:45 -0800 | [diff] [blame] | 1819 | static inline int is_si_special(const struct siginfo *info) |
| 1820 | { |
| 1821 | return info <= SEND_SIG_FORCED; |
| 1822 | } |
| 1823 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1824 | /* True if we are on the alternate signal stack. */ |
| 1825 | |
| 1826 | static inline int on_sig_stack(unsigned long sp) |
| 1827 | { |
| 1828 | return (sp - current->sas_ss_sp < current->sas_ss_size); |
| 1829 | } |
| 1830 | |
| 1831 | static inline int sas_ss_flags(unsigned long sp) |
| 1832 | { |
| 1833 | return (current->sas_ss_size == 0 ? SS_DISABLE |
| 1834 | : on_sig_stack(sp) ? SS_ONSTACK : 0); |
| 1835 | } |
| 1836 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1837 | /* |
| 1838 | * Routines for handling mm_structs |
| 1839 | */ |
| 1840 | extern struct mm_struct * mm_alloc(void); |
| 1841 | |
| 1842 | /* mmdrop drops the mm and the page tables */ |
Harvey Harrison | b3c9752 | 2008-02-13 15:03:15 -0800 | [diff] [blame] | 1843 | extern void __mmdrop(struct mm_struct *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1844 | static inline void mmdrop(struct mm_struct * mm) |
| 1845 | { |
Ingo Molnar | 6fb43d7 | 2007-07-09 18:52:01 +0200 | [diff] [blame] | 1846 | if (unlikely(atomic_dec_and_test(&mm->mm_count))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1847 | __mmdrop(mm); |
| 1848 | } |
| 1849 | |
| 1850 | /* mmput gets rid of the mappings and all user-space */ |
| 1851 | extern void mmput(struct mm_struct *); |
| 1852 | /* Grab a reference to a task's mm, if it is not already going away */ |
| 1853 | extern struct mm_struct *get_task_mm(struct task_struct *task); |
| 1854 | /* Remove the current tasks stale references to the old mm_struct */ |
| 1855 | extern void mm_release(struct task_struct *, struct mm_struct *); |
Carsten Otte | 402b086 | 2008-03-25 18:47:10 +0100 | [diff] [blame] | 1856 | /* Allocate a new mm structure and copy contents from tsk->mm */ |
| 1857 | extern struct mm_struct *dup_mm(struct task_struct *tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1858 | |
| 1859 | extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *); |
| 1860 | extern void flush_thread(void); |
| 1861 | extern void exit_thread(void); |
| 1862 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1863 | extern void exit_files(struct task_struct *); |
Oleg Nesterov | 6b3934e | 2006-03-28 16:11:16 -0800 | [diff] [blame] | 1864 | extern void __cleanup_signal(struct signal_struct *); |
Oleg Nesterov | a7e5328 | 2006-03-28 16:11:27 -0800 | [diff] [blame] | 1865 | extern void __cleanup_sighand(struct sighand_struct *); |
Oleg Nesterov | cbaffba | 2008-05-26 20:55:42 +0400 | [diff] [blame] | 1866 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1867 | extern void exit_itimers(struct signal_struct *); |
Oleg Nesterov | cbaffba | 2008-05-26 20:55:42 +0400 | [diff] [blame] | 1868 | extern void flush_itimer_signals(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1869 | |
| 1870 | extern NORET_TYPE void do_group_exit(int); |
| 1871 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1872 | extern void daemonize(const char *, ...); |
| 1873 | extern int allow_signal(int); |
| 1874 | extern int disallow_signal(int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1875 | |
| 1876 | extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *); |
| 1877 | 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] | 1878 | struct task_struct *fork_idle(int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1879 | |
| 1880 | extern void set_task_comm(struct task_struct *tsk, char *from); |
Andrew Morton | 59714d6 | 2008-02-04 22:27:21 -0800 | [diff] [blame] | 1881 | extern char *get_task_comm(char *to, struct task_struct *tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1882 | |
| 1883 | #ifdef CONFIG_SMP |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 1884 | extern void wait_task_inactive(struct task_struct * p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1885 | #else |
| 1886 | #define wait_task_inactive(p) do { } while (0) |
| 1887 | #endif |
| 1888 | |
Eric W. Biederman | 5e85d4a | 2006-04-18 22:20:16 -0700 | [diff] [blame] | 1889 | #define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1890 | |
| 1891 | #define for_each_process(p) \ |
| 1892 | for (p = &init_task ; (p = next_task(p)) != &init_task ; ) |
| 1893 | |
| 1894 | /* |
| 1895 | * Careful: do_each_thread/while_each_thread is a double loop so |
| 1896 | * 'break' will not work as expected - use goto instead. |
| 1897 | */ |
| 1898 | #define do_each_thread(g, t) \ |
| 1899 | for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do |
| 1900 | |
| 1901 | #define while_each_thread(g, t) \ |
| 1902 | while ((t = next_thread(t)) != g) |
| 1903 | |
Eric W. Biederman | de12a78 | 2006-04-10 17:16:49 -0600 | [diff] [blame] | 1904 | /* de_thread depends on thread_group_leader not being a pid based check */ |
| 1905 | #define thread_group_leader(p) (p == p->group_leader) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1906 | |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 1907 | /* Do to the insanities of de_thread it is possible for a process |
| 1908 | * to have the pid of the thread group leader without actually being |
| 1909 | * the thread group leader. For iteration through the pids in proc |
| 1910 | * all we care about is that we have a task with the appropriate |
| 1911 | * pid, we don't actually care if we have the right task. |
| 1912 | */ |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 1913 | static inline int has_group_leader_pid(struct task_struct *p) |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 1914 | { |
| 1915 | return p->pid == p->tgid; |
| 1916 | } |
| 1917 | |
Pavel Emelyanov | bac0abd | 2007-10-18 23:40:18 -0700 | [diff] [blame] | 1918 | static inline |
| 1919 | int same_thread_group(struct task_struct *p1, struct task_struct *p2) |
| 1920 | { |
| 1921 | return p1->tgid == p2->tgid; |
| 1922 | } |
| 1923 | |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 1924 | static inline struct task_struct *next_thread(const struct task_struct *p) |
Oleg Nesterov | 47e6532 | 2006-03-28 16:11:25 -0800 | [diff] [blame] | 1925 | { |
| 1926 | return list_entry(rcu_dereference(p->thread_group.next), |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 1927 | struct task_struct, thread_group); |
Oleg Nesterov | 47e6532 | 2006-03-28 16:11:25 -0800 | [diff] [blame] | 1928 | } |
| 1929 | |
Alexey Dobriyan | e868171 | 2007-10-26 12:17:22 +0400 | [diff] [blame] | 1930 | static inline int thread_group_empty(struct task_struct *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1931 | { |
Oleg Nesterov | 47e6532 | 2006-03-28 16:11:25 -0800 | [diff] [blame] | 1932 | return list_empty(&p->thread_group); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1933 | } |
| 1934 | |
| 1935 | #define delay_group_leader(p) \ |
| 1936 | (thread_group_leader(p) && !thread_group_empty(p)) |
| 1937 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1938 | /* |
Eric W. Biederman | 260ea10 | 2006-06-23 02:05:18 -0700 | [diff] [blame] | 1939 | * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 1940 | * subscriptions and synchronises with wait4(). Also used in procfs. Also |
Paul Menage | ddbcc7e | 2007-10-18 23:39:30 -0700 | [diff] [blame] | 1941 | * pins the final release of task.io_context. Also protects ->cpuset and |
| 1942 | * ->cgroup.subsys[]. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1943 | * |
| 1944 | * Nests both inside and outside of read_lock(&tasklist_lock). |
| 1945 | * It must not be nested with write_lock_irq(&tasklist_lock), |
| 1946 | * neither inside nor outside. |
| 1947 | */ |
| 1948 | static inline void task_lock(struct task_struct *p) |
| 1949 | { |
| 1950 | spin_lock(&p->alloc_lock); |
| 1951 | } |
| 1952 | |
| 1953 | static inline void task_unlock(struct task_struct *p) |
| 1954 | { |
| 1955 | spin_unlock(&p->alloc_lock); |
| 1956 | } |
| 1957 | |
Oleg Nesterov | f63ee72 | 2006-03-28 16:11:13 -0800 | [diff] [blame] | 1958 | extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk, |
| 1959 | unsigned long *flags); |
| 1960 | |
| 1961 | static inline void unlock_task_sighand(struct task_struct *tsk, |
| 1962 | unsigned long *flags) |
| 1963 | { |
| 1964 | spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); |
| 1965 | } |
| 1966 | |
Al Viro | f037360 | 2005-11-13 16:06:57 -0800 | [diff] [blame] | 1967 | #ifndef __HAVE_THREAD_FUNCTIONS |
| 1968 | |
Roman Zippel | f7e4217 | 2007-05-09 02:35:17 -0700 | [diff] [blame] | 1969 | #define task_thread_info(task) ((struct thread_info *)(task)->stack) |
| 1970 | #define task_stack_page(task) ((task)->stack) |
Al Viro | a1261f5 | 2005-11-13 16:06:55 -0800 | [diff] [blame] | 1971 | |
Al Viro | 10ebffd | 2005-11-13 16:06:56 -0800 | [diff] [blame] | 1972 | static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) |
| 1973 | { |
| 1974 | *task_thread_info(p) = *task_thread_info(org); |
| 1975 | task_thread_info(p)->task = p; |
| 1976 | } |
| 1977 | |
| 1978 | static inline unsigned long *end_of_stack(struct task_struct *p) |
| 1979 | { |
Roman Zippel | f7e4217 | 2007-05-09 02:35:17 -0700 | [diff] [blame] | 1980 | return (unsigned long *)(task_thread_info(p) + 1); |
Al Viro | 10ebffd | 2005-11-13 16:06:56 -0800 | [diff] [blame] | 1981 | } |
| 1982 | |
Al Viro | f037360 | 2005-11-13 16:06:57 -0800 | [diff] [blame] | 1983 | #endif |
| 1984 | |
FUJITA Tomonori | 8b05c7e | 2008-07-23 21:26:53 -0700 | [diff] [blame] | 1985 | static inline int object_is_on_stack(void *obj) |
| 1986 | { |
| 1987 | void *stack = task_stack_page(current); |
| 1988 | |
| 1989 | return (obj >= stack) && (obj < (stack + THREAD_SIZE)); |
| 1990 | } |
| 1991 | |
Benjamin Herrenschmidt | 8c9843e | 2008-04-18 16:56:15 +1000 | [diff] [blame] | 1992 | extern void thread_info_cache_init(void); |
| 1993 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1994 | /* set thread flags in other task's structures |
| 1995 | * - see asm/thread_info.h for TIF_xxxx flags available |
| 1996 | */ |
| 1997 | static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) |
| 1998 | { |
Al Viro | a1261f5 | 2005-11-13 16:06:55 -0800 | [diff] [blame] | 1999 | set_ti_thread_flag(task_thread_info(tsk), flag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2000 | } |
| 2001 | |
| 2002 | static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) |
| 2003 | { |
Al Viro | a1261f5 | 2005-11-13 16:06:55 -0800 | [diff] [blame] | 2004 | clear_ti_thread_flag(task_thread_info(tsk), flag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2005 | } |
| 2006 | |
| 2007 | static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) |
| 2008 | { |
Al Viro | a1261f5 | 2005-11-13 16:06:55 -0800 | [diff] [blame] | 2009 | return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2010 | } |
| 2011 | |
| 2012 | static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) |
| 2013 | { |
Al Viro | a1261f5 | 2005-11-13 16:06:55 -0800 | [diff] [blame] | 2014 | return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2015 | } |
| 2016 | |
| 2017 | static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) |
| 2018 | { |
Al Viro | a1261f5 | 2005-11-13 16:06:55 -0800 | [diff] [blame] | 2019 | return test_ti_thread_flag(task_thread_info(tsk), flag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2020 | } |
| 2021 | |
| 2022 | static inline void set_tsk_need_resched(struct task_struct *tsk) |
| 2023 | { |
| 2024 | set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); |
| 2025 | } |
| 2026 | |
| 2027 | static inline void clear_tsk_need_resched(struct task_struct *tsk) |
| 2028 | { |
| 2029 | clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); |
| 2030 | } |
| 2031 | |
Gregory Haskins | 8ae121a | 2008-04-23 07:13:29 -0400 | [diff] [blame] | 2032 | static inline int test_tsk_need_resched(struct task_struct *tsk) |
| 2033 | { |
| 2034 | return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); |
| 2035 | } |
| 2036 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2037 | static inline int signal_pending(struct task_struct *p) |
| 2038 | { |
| 2039 | return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); |
| 2040 | } |
Matthew Wilcox | f776d12 | 2007-12-06 11:15:50 -0500 | [diff] [blame] | 2041 | |
Harvey Harrison | b3c9752 | 2008-02-13 15:03:15 -0800 | [diff] [blame] | 2042 | extern int __fatal_signal_pending(struct task_struct *p); |
Matthew Wilcox | f776d12 | 2007-12-06 11:15:50 -0500 | [diff] [blame] | 2043 | |
| 2044 | static inline int fatal_signal_pending(struct task_struct *p) |
| 2045 | { |
| 2046 | return signal_pending(p) && __fatal_signal_pending(p); |
| 2047 | } |
| 2048 | |
Oleg Nesterov | 16882c1 | 2008-06-08 21:20:41 +0400 | [diff] [blame] | 2049 | static inline int signal_pending_state(long state, struct task_struct *p) |
| 2050 | { |
| 2051 | if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL))) |
| 2052 | return 0; |
| 2053 | if (!signal_pending(p)) |
| 2054 | return 0; |
| 2055 | |
Oleg Nesterov | 16882c1 | 2008-06-08 21:20:41 +0400 | [diff] [blame] | 2056 | return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p); |
| 2057 | } |
| 2058 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2059 | static inline int need_resched(void) |
| 2060 | { |
Linus Torvalds | 9404ef0 | 2008-05-12 10:14:22 -0700 | [diff] [blame] | 2061 | return unlikely(test_thread_flag(TIF_NEED_RESCHED)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2062 | } |
| 2063 | |
| 2064 | /* |
| 2065 | * cond_resched() and cond_resched_lock(): latency reduction via |
| 2066 | * explicit rescheduling in places that are safe. The return |
| 2067 | * value indicates whether a reschedule was done in fact. |
| 2068 | * cond_resched_lock() will drop the spinlock before scheduling, |
| 2069 | * cond_resched_softirq() will enable bhs before scheduling. |
| 2070 | */ |
Linus Torvalds | c3921ab | 2008-05-11 16:04:48 -0700 | [diff] [blame] | 2071 | extern int _cond_resched(void); |
Linus Torvalds | c714a53 | 2008-05-12 13:34:13 -0700 | [diff] [blame] | 2072 | #ifdef CONFIG_PREEMPT_BKL |
Herbert Xu | 02b67cc3 | 2008-01-25 21:08:28 +0100 | [diff] [blame] | 2073 | static inline int cond_resched(void) |
| 2074 | { |
| 2075 | return 0; |
| 2076 | } |
| 2077 | #else |
Herbert Xu | 02b67cc3 | 2008-01-25 21:08:28 +0100 | [diff] [blame] | 2078 | static inline int cond_resched(void) |
| 2079 | { |
| 2080 | return _cond_resched(); |
| 2081 | } |
| 2082 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2083 | extern int cond_resched_lock(spinlock_t * lock); |
| 2084 | extern int cond_resched_softirq(void); |
Linus Torvalds | c3921ab | 2008-05-11 16:04:48 -0700 | [diff] [blame] | 2085 | static inline int cond_resched_bkl(void) |
| 2086 | { |
| 2087 | return _cond_resched(); |
| 2088 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2089 | |
| 2090 | /* |
| 2091 | * Does a critical section need to be broken due to another |
Nick Piggin | 95c354f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 2092 | * task waiting?: (technically does not depend on CONFIG_PREEMPT, |
| 2093 | * but a general need for low latency) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2094 | */ |
Nick Piggin | 95c354f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 2095 | static inline int spin_needbreak(spinlock_t *lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2096 | { |
Nick Piggin | 95c354f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 2097 | #ifdef CONFIG_PREEMPT |
| 2098 | return spin_is_contended(lock); |
| 2099 | #else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2100 | return 0; |
Nick Piggin | 95c354f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 2101 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2102 | } |
| 2103 | |
Roland McGrath | 7bb44ad | 2007-05-23 13:57:44 -0700 | [diff] [blame] | 2104 | /* |
| 2105 | * Reevaluate whether the task has signals pending delivery. |
| 2106 | * Wake the task if so. |
| 2107 | * This is required every time the blocked sigset_t changes. |
| 2108 | * callers must hold sighand->siglock. |
| 2109 | */ |
| 2110 | extern void recalc_sigpending_and_wake(struct task_struct *t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2111 | extern void recalc_sigpending(void); |
| 2112 | |
| 2113 | extern void signal_wake_up(struct task_struct *t, int resume_stopped); |
| 2114 | |
| 2115 | /* |
| 2116 | * Wrappers for p->thread_info->cpu access. No-op on UP. |
| 2117 | */ |
| 2118 | #ifdef CONFIG_SMP |
| 2119 | |
| 2120 | static inline unsigned int task_cpu(const struct task_struct *p) |
| 2121 | { |
Al Viro | a1261f5 | 2005-11-13 16:06:55 -0800 | [diff] [blame] | 2122 | return task_thread_info(p)->cpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2123 | } |
| 2124 | |
Ingo Molnar | c65cc87 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 2125 | extern void set_task_cpu(struct task_struct *p, unsigned int cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2126 | |
| 2127 | #else |
| 2128 | |
| 2129 | static inline unsigned int task_cpu(const struct task_struct *p) |
| 2130 | { |
| 2131 | return 0; |
| 2132 | } |
| 2133 | |
| 2134 | static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) |
| 2135 | { |
| 2136 | } |
| 2137 | |
| 2138 | #endif /* CONFIG_SMP */ |
| 2139 | |
| 2140 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT |
| 2141 | extern void arch_pick_mmap_layout(struct mm_struct *mm); |
| 2142 | #else |
| 2143 | static inline void arch_pick_mmap_layout(struct mm_struct *mm) |
| 2144 | { |
| 2145 | mm->mmap_base = TASK_UNMAPPED_BASE; |
| 2146 | mm->get_unmapped_area = arch_get_unmapped_area; |
| 2147 | mm->unmap_area = arch_unmap_area; |
| 2148 | } |
| 2149 | #endif |
| 2150 | |
Ingo Molnar | 1a3c303 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2151 | #ifdef CONFIG_TRACING |
| 2152 | extern void |
| 2153 | __trace_special(void *__tr, void *__data, |
| 2154 | unsigned long arg1, unsigned long arg2, unsigned long arg3); |
| 2155 | #else |
| 2156 | static inline void |
| 2157 | __trace_special(void *__tr, void *__data, |
| 2158 | unsigned long arg1, unsigned long arg2, unsigned long arg3) |
| 2159 | { |
| 2160 | } |
| 2161 | #endif |
| 2162 | |
Mike Travis | b53e921 | 2008-04-04 18:11:08 -0700 | [diff] [blame] | 2163 | extern long sched_setaffinity(pid_t pid, const cpumask_t *new_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2164 | extern long sched_getaffinity(pid_t pid, cpumask_t *mask); |
| 2165 | |
Siddha, Suresh B | 5c45bf2 | 2006-06-27 02:54:42 -0700 | [diff] [blame] | 2166 | extern int sched_mc_power_savings, sched_smt_power_savings; |
Siddha, Suresh B | 5c45bf2 | 2006-06-27 02:54:42 -0700 | [diff] [blame] | 2167 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2168 | extern void normalize_rt_tasks(void); |
| 2169 | |
Peter Zijlstra | 052f1dc | 2008-02-13 15:45:40 +0100 | [diff] [blame] | 2170 | #ifdef CONFIG_GROUP_SCHED |
Srivatsa Vaddagiri | 9b5b775 | 2007-10-15 17:00:09 +0200 | [diff] [blame] | 2171 | |
Ingo Molnar | 4cf86d7 | 2007-10-15 17:00:14 +0200 | [diff] [blame] | 2172 | extern struct task_group init_task_group; |
Peter Zijlstra | eff766a | 2008-04-19 19:45:00 +0200 | [diff] [blame] | 2173 | #ifdef CONFIG_USER_SCHED |
| 2174 | extern struct task_group root_task_group; |
| 2175 | #endif |
Srivatsa Vaddagiri | 9b5b775 | 2007-10-15 17:00:09 +0200 | [diff] [blame] | 2176 | |
Dhaval Giani | ec7dc8a | 2008-04-19 19:44:59 +0200 | [diff] [blame] | 2177 | extern struct task_group *sched_create_group(struct task_group *parent); |
Ingo Molnar | 4cf86d7 | 2007-10-15 17:00:14 +0200 | [diff] [blame] | 2178 | extern void sched_destroy_group(struct task_group *tg); |
Srivatsa Vaddagiri | 9b5b775 | 2007-10-15 17:00:09 +0200 | [diff] [blame] | 2179 | extern void sched_move_task(struct task_struct *tsk); |
Peter Zijlstra | 052f1dc | 2008-02-13 15:45:40 +0100 | [diff] [blame] | 2180 | #ifdef CONFIG_FAIR_GROUP_SCHED |
Ingo Molnar | 4cf86d7 | 2007-10-15 17:00:14 +0200 | [diff] [blame] | 2181 | 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] | 2182 | extern unsigned long sched_group_shares(struct task_group *tg); |
Peter Zijlstra | 052f1dc | 2008-02-13 15:45:40 +0100 | [diff] [blame] | 2183 | #endif |
| 2184 | #ifdef CONFIG_RT_GROUP_SCHED |
Peter Zijlstra | 9f0c1e5 | 2008-02-13 15:45:39 +0100 | [diff] [blame] | 2185 | extern int sched_group_set_rt_runtime(struct task_group *tg, |
| 2186 | long rt_runtime_us); |
| 2187 | extern long sched_group_rt_runtime(struct task_group *tg); |
Peter Zijlstra | d0b27fa | 2008-04-19 19:44:57 +0200 | [diff] [blame] | 2188 | extern int sched_group_set_rt_period(struct task_group *tg, |
| 2189 | long rt_period_us); |
| 2190 | extern long sched_group_rt_period(struct task_group *tg); |
Peter Zijlstra | 052f1dc | 2008-02-13 15:45:40 +0100 | [diff] [blame] | 2191 | #endif |
Srivatsa Vaddagiri | 9b5b775 | 2007-10-15 17:00:09 +0200 | [diff] [blame] | 2192 | #endif |
| 2193 | |
Alexey Dobriyan | 4b98d11 | 2007-02-10 01:46:45 -0800 | [diff] [blame] | 2194 | #ifdef CONFIG_TASK_XACCT |
| 2195 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) |
| 2196 | { |
| 2197 | tsk->rchar += amt; |
| 2198 | } |
| 2199 | |
| 2200 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) |
| 2201 | { |
| 2202 | tsk->wchar += amt; |
| 2203 | } |
| 2204 | |
| 2205 | static inline void inc_syscr(struct task_struct *tsk) |
| 2206 | { |
| 2207 | tsk->syscr++; |
| 2208 | } |
| 2209 | |
| 2210 | static inline void inc_syscw(struct task_struct *tsk) |
| 2211 | { |
| 2212 | tsk->syscw++; |
| 2213 | } |
| 2214 | #else |
| 2215 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) |
| 2216 | { |
| 2217 | } |
| 2218 | |
| 2219 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) |
| 2220 | { |
| 2221 | } |
| 2222 | |
| 2223 | static inline void inc_syscr(struct task_struct *tsk) |
| 2224 | { |
| 2225 | } |
| 2226 | |
| 2227 | static inline void inc_syscw(struct task_struct *tsk) |
| 2228 | { |
| 2229 | } |
| 2230 | #endif |
| 2231 | |
Adrian Bunk | e6fe664 | 2007-11-09 22:39:39 +0100 | [diff] [blame] | 2232 | #ifdef CONFIG_SMP |
| 2233 | void migration_init(void); |
| 2234 | #else |
| 2235 | static inline void migration_init(void) |
| 2236 | { |
| 2237 | } |
| 2238 | #endif |
| 2239 | |
Dave Hansen | 8245525 | 2008-02-04 22:28:59 -0800 | [diff] [blame] | 2240 | #ifndef TASK_SIZE_OF |
| 2241 | #define TASK_SIZE_OF(tsk) TASK_SIZE |
| 2242 | #endif |
| 2243 | |
Balbir Singh | cf475ad | 2008-04-29 01:00:16 -0700 | [diff] [blame] | 2244 | #ifdef CONFIG_MM_OWNER |
| 2245 | extern void mm_update_next_owner(struct mm_struct *mm); |
| 2246 | extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p); |
| 2247 | #else |
| 2248 | static inline void mm_update_next_owner(struct mm_struct *mm) |
| 2249 | { |
| 2250 | } |
| 2251 | |
| 2252 | static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p) |
| 2253 | { |
| 2254 | } |
| 2255 | #endif /* CONFIG_MM_OWNER */ |
| 2256 | |
Steven Rostedt | 7c731e0 | 2008-05-12 21:20:41 +0200 | [diff] [blame] | 2257 | #define TASK_STATE_TO_CHAR_STR "RSDTtZX" |
| 2258 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2259 | #endif /* __KERNEL__ */ |
| 2260 | |
| 2261 | #endif |