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 | #include <linux/auxvec.h> /* For AT_VECTOR_SIZE */ |
| 5 | |
| 6 | /* |
| 7 | * cloning flags: |
| 8 | */ |
| 9 | #define CSIGNAL 0x000000ff /* signal mask to be sent at exit */ |
| 10 | #define CLONE_VM 0x00000100 /* set if VM shared between processes */ |
| 11 | #define CLONE_FS 0x00000200 /* set if fs info shared between processes */ |
| 12 | #define CLONE_FILES 0x00000400 /* set if open files shared between processes */ |
| 13 | #define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */ |
| 14 | #define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */ |
| 15 | #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */ |
| 16 | #define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */ |
| 17 | #define CLONE_THREAD 0x00010000 /* Same thread group? */ |
| 18 | #define CLONE_NEWNS 0x00020000 /* New namespace group? */ |
| 19 | #define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */ |
| 20 | #define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */ |
| 21 | #define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */ |
| 22 | #define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */ |
| 23 | #define CLONE_DETACHED 0x00400000 /* Unused, ignored */ |
| 24 | #define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */ |
| 25 | #define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */ |
| 26 | #define CLONE_STOPPED 0x02000000 /* Start in stopped state */ |
Serge E. Hallyn | 071df10 | 2006-10-02 02:18:17 -0700 | [diff] [blame] | 27 | #define CLONE_NEWUTS 0x04000000 /* New utsname group? */ |
Kirill Korotaev | 25b21cb | 2006-10-02 02:18:19 -0700 | [diff] [blame] | 28 | #define CLONE_NEWIPC 0x08000000 /* New ipcs */ |
Serge E. Hallyn | 77ec739 | 2007-07-15 23:41:01 -0700 | [diff] [blame] | 29 | #define CLONE_NEWUSER 0x10000000 /* New user namespace */ |
Eric W. Biederman | 169e367 | 2007-09-27 17:10:06 -0700 | [diff] [blame] | 30 | #define CLONE_NEWNET 0x40000000 /* New network namespace */ |
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> |
| 61 | |
| 62 | #include <asm/system.h> |
| 63 | #include <asm/semaphore.h> |
| 64 | #include <asm/page.h> |
| 65 | #include <asm/ptrace.h> |
| 66 | #include <asm/mmu.h> |
| 67 | #include <asm/cputime.h> |
| 68 | |
| 69 | #include <linux/smp.h> |
| 70 | #include <linux/sem.h> |
| 71 | #include <linux/signal.h> |
| 72 | #include <linux/securebits.h> |
| 73 | #include <linux/fs_struct.h> |
| 74 | #include <linux/compiler.h> |
| 75 | #include <linux/completion.h> |
| 76 | #include <linux/pid.h> |
| 77 | #include <linux/percpu.h> |
| 78 | #include <linux/topology.h> |
| 79 | #include <linux/seccomp.h> |
Ingo Molnar | e56d090 | 2006-01-08 01:01:37 -0800 | [diff] [blame] | 80 | #include <linux/rcupdate.h> |
Ingo Molnar | 0771dfe | 2006-03-27 01:16:22 -0800 | [diff] [blame] | 81 | #include <linux/futex.h> |
Ingo Molnar | 23f78d4a | 2006-06-27 02:54:53 -0700 | [diff] [blame] | 82 | #include <linux/rtmutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | |
David Woodhouse | a3b6714 | 2006-04-25 14:54:40 +0100 | [diff] [blame] | 84 | #include <linux/time.h> |
| 85 | #include <linux/param.h> |
| 86 | #include <linux/resource.h> |
| 87 | #include <linux/timer.h> |
| 88 | #include <linux/hrtimer.h> |
Andrew Morton | 7c3ab73 | 2006-12-10 02:19:19 -0800 | [diff] [blame] | 89 | #include <linux/task_io_accounting.h> |
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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | struct exec_domain; |
Ingo Molnar | c87e283 | 2006-06-27 02:54:58 -0700 | [diff] [blame] | 94 | struct futex_pi_state; |
Neil Brown | d89d879 | 2007-05-01 09:53:42 +0200 | [diff] [blame] | 95 | struct bio; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | |
| 97 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | * List of flags we want to share for kernel threads, |
| 99 | * if only because they are not used by them anyway. |
| 100 | */ |
| 101 | #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND) |
| 102 | |
| 103 | /* |
| 104 | * These are the constant used to fake the fixed-point load-average |
| 105 | * counting. Some notes: |
| 106 | * - 11 bit fractions expand to 22 bits by the multiplies: this gives |
| 107 | * a load-average precision of 10 bits integer + 11 bits fractional |
| 108 | * - if you want to count load-averages more often, you need more |
| 109 | * precision, or rounding will get you. With 2-second counting freq, |
| 110 | * the EXP_n values would be 1981, 2034 and 2043 if still using only |
| 111 | * 11 bit fractions. |
| 112 | */ |
| 113 | extern unsigned long avenrun[]; /* Load averages */ |
| 114 | |
| 115 | #define FSHIFT 11 /* nr of bits of precision */ |
| 116 | #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ |
Linus Torvalds | 0c2043a | 2007-10-07 16:17:38 -0700 | [diff] [blame] | 117 | #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ |
| 119 | #define EXP_5 2014 /* 1/exp(5sec/5min) */ |
| 120 | #define EXP_15 2037 /* 1/exp(5sec/15min) */ |
| 121 | |
| 122 | #define CALC_LOAD(load,exp,n) \ |
| 123 | load *= exp; \ |
| 124 | load += n*(FIXED_1-exp); \ |
| 125 | load >>= FSHIFT; |
| 126 | |
| 127 | extern unsigned long total_forks; |
| 128 | extern int nr_threads; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | DECLARE_PER_CPU(unsigned long, process_counts); |
| 130 | extern int nr_processes(void); |
| 131 | extern unsigned long nr_running(void); |
| 132 | extern unsigned long nr_uninterruptible(void); |
Jack Steiner | db1b1fe | 2006-03-31 02:31:21 -0800 | [diff] [blame] | 133 | extern unsigned long nr_active(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | extern unsigned long nr_iowait(void); |
Peter Williams | 2dd73a4 | 2006-06-27 02:54:34 -0700 | [diff] [blame] | 135 | extern unsigned long weighted_cpuload(const int cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 137 | struct seq_file; |
| 138 | struct cfs_rq; |
| 139 | #ifdef CONFIG_SCHED_DEBUG |
| 140 | extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m); |
| 141 | extern void proc_sched_set_task(struct task_struct *p); |
| 142 | extern void |
Ingo Molnar | 5cef9ec | 2007-08-09 11:16:47 +0200 | [diff] [blame] | 143 | 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] | 144 | #else |
| 145 | static inline void |
| 146 | proc_sched_show_task(struct task_struct *p, struct seq_file *m) |
| 147 | { |
| 148 | } |
| 149 | static inline void proc_sched_set_task(struct task_struct *p) |
| 150 | { |
| 151 | } |
| 152 | static inline void |
Ingo Molnar | 5cef9ec | 2007-08-09 11:16:47 +0200 | [diff] [blame] | 153 | 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] | 154 | { |
| 155 | } |
| 156 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | |
Linus Torvalds | 4a8342d | 2005-09-29 15:18:21 -0700 | [diff] [blame] | 158 | /* |
| 159 | * Task state bitmask. NOTE! These bits are also |
| 160 | * encoded in fs/proc/array.c: get_task_state(). |
| 161 | * |
| 162 | * We have two separate sets of flags: task->state |
| 163 | * is about runnability, while task->exit_state are |
| 164 | * about the task exiting. Confusing, but this way |
| 165 | * modifying one set can't modify the other one by |
| 166 | * mistake. |
| 167 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | #define TASK_RUNNING 0 |
| 169 | #define TASK_INTERRUPTIBLE 1 |
| 170 | #define TASK_UNINTERRUPTIBLE 2 |
Linus Torvalds | 4a8342d | 2005-09-29 15:18:21 -0700 | [diff] [blame] | 171 | #define TASK_STOPPED 4 |
| 172 | #define TASK_TRACED 8 |
| 173 | /* in tsk->exit_state */ |
| 174 | #define EXIT_ZOMBIE 16 |
| 175 | #define EXIT_DEAD 32 |
| 176 | /* in tsk->state again */ |
| 177 | #define TASK_NONINTERACTIVE 64 |
Oleg Nesterov | c394cc9 | 2006-09-29 02:01:11 -0700 | [diff] [blame] | 178 | #define TASK_DEAD 128 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | |
| 180 | #define __set_task_state(tsk, state_value) \ |
| 181 | do { (tsk)->state = (state_value); } while (0) |
| 182 | #define set_task_state(tsk, state_value) \ |
| 183 | set_mb((tsk)->state, (state_value)) |
| 184 | |
Andrew Morton | 498d0c5 | 2005-09-13 01:25:14 -0700 | [diff] [blame] | 185 | /* |
| 186 | * set_current_state() includes a barrier so that the write of current->state |
| 187 | * is correctly serialised wrt the caller's subsequent test of whether to |
| 188 | * actually sleep: |
| 189 | * |
| 190 | * set_current_state(TASK_UNINTERRUPTIBLE); |
| 191 | * if (do_i_need_to_sleep()) |
| 192 | * schedule(); |
| 193 | * |
| 194 | * If the caller does not need such serialisation then use __set_current_state() |
| 195 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | #define __set_current_state(state_value) \ |
| 197 | do { current->state = (state_value); } while (0) |
| 198 | #define set_current_state(state_value) \ |
| 199 | set_mb(current->state, (state_value)) |
| 200 | |
| 201 | /* Task command name length */ |
| 202 | #define TASK_COMM_LEN 16 |
| 203 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | #include <linux/spinlock.h> |
| 205 | |
| 206 | /* |
| 207 | * This serializes "schedule()" and also protects |
| 208 | * the run-queue from deletions/modifications (but |
| 209 | * _adding_ to the beginning of the run-queue has |
| 210 | * a separate lock). |
| 211 | */ |
| 212 | extern rwlock_t tasklist_lock; |
| 213 | extern spinlock_t mmlist_lock; |
| 214 | |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 215 | struct task_struct; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | |
| 217 | extern void sched_init(void); |
| 218 | extern void sched_init_smp(void); |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 219 | extern void init_idle(struct task_struct *idle, int cpu); |
Ingo Molnar | 1df2105 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 220 | extern void init_idle_bootup_task(struct task_struct *idle); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | |
| 222 | extern cpumask_t nohz_cpu_mask; |
Siddha, Suresh B | 46cb4b7 | 2007-05-08 00:32:51 -0700 | [diff] [blame] | 223 | #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ) |
| 224 | extern int select_nohz_load_balancer(int cpu); |
| 225 | #else |
| 226 | static inline int select_nohz_load_balancer(int cpu) |
| 227 | { |
| 228 | return 0; |
| 229 | } |
| 230 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | |
Ingo Molnar | e59e2ae | 2006-12-06 20:35:59 -0800 | [diff] [blame] | 232 | /* |
Ingo Molnar | 39bc89f | 2007-04-25 20:50:03 -0700 | [diff] [blame] | 233 | * Only dump TASK_* tasks. (0 for all tasks) |
Ingo Molnar | e59e2ae | 2006-12-06 20:35:59 -0800 | [diff] [blame] | 234 | */ |
| 235 | extern void show_state_filter(unsigned long state_filter); |
| 236 | |
| 237 | static inline void show_state(void) |
| 238 | { |
Ingo Molnar | 39bc89f | 2007-04-25 20:50:03 -0700 | [diff] [blame] | 239 | show_state_filter(0); |
Ingo Molnar | e59e2ae | 2006-12-06 20:35:59 -0800 | [diff] [blame] | 240 | } |
| 241 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | extern void show_regs(struct pt_regs *); |
| 243 | |
| 244 | /* |
| 245 | * TASK is a pointer to the task whose backtrace we want to see (or NULL for current |
| 246 | * task), SP is the stack pointer of the first frame that should be shown in the back |
| 247 | * trace (or NULL if the entire call-chain of the task should be shown). |
| 248 | */ |
| 249 | extern void show_stack(struct task_struct *task, unsigned long *sp); |
| 250 | |
| 251 | void io_schedule(void); |
| 252 | long io_schedule_timeout(long timeout); |
| 253 | |
| 254 | extern void cpu_init (void); |
| 255 | extern void trap_init(void); |
| 256 | extern void update_process_times(int user); |
| 257 | extern void scheduler_tick(void); |
| 258 | |
Ingo Molnar | 8446f1d | 2005-09-06 15:16:27 -0700 | [diff] [blame] | 259 | #ifdef CONFIG_DETECT_SOFTLOCKUP |
Ingo Molnar | 6687a97 | 2006-03-24 03:18:41 -0800 | [diff] [blame] | 260 | extern void softlockup_tick(void); |
Ingo Molnar | 8446f1d | 2005-09-06 15:16:27 -0700 | [diff] [blame] | 261 | extern void spawn_softlockup_task(void); |
| 262 | extern void touch_softlockup_watchdog(void); |
Jeremy Fitzhardinge | 04c9167 | 2007-05-08 00:28:05 -0700 | [diff] [blame] | 263 | extern void touch_all_softlockup_watchdogs(void); |
Ingo Molnar | 8446f1d | 2005-09-06 15:16:27 -0700 | [diff] [blame] | 264 | #else |
Ingo Molnar | 6687a97 | 2006-03-24 03:18:41 -0800 | [diff] [blame] | 265 | static inline void softlockup_tick(void) |
Ingo Molnar | 8446f1d | 2005-09-06 15:16:27 -0700 | [diff] [blame] | 266 | { |
| 267 | } |
| 268 | static inline void spawn_softlockup_task(void) |
| 269 | { |
| 270 | } |
| 271 | static inline void touch_softlockup_watchdog(void) |
| 272 | { |
| 273 | } |
Jeremy Fitzhardinge | 04c9167 | 2007-05-08 00:28:05 -0700 | [diff] [blame] | 274 | static inline void touch_all_softlockup_watchdogs(void) |
| 275 | { |
| 276 | } |
Ingo Molnar | 8446f1d | 2005-09-06 15:16:27 -0700 | [diff] [blame] | 277 | #endif |
| 278 | |
| 279 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | /* Attach to any functions which should be ignored in wchan output. */ |
| 281 | #define __sched __attribute__((__section__(".sched.text"))) |
| 282 | /* Is this address in the __sched functions? */ |
| 283 | extern int in_sched_functions(unsigned long addr); |
| 284 | |
| 285 | #define MAX_SCHEDULE_TIMEOUT LONG_MAX |
| 286 | extern signed long FASTCALL(schedule_timeout(signed long timeout)); |
Nishanth Aravamudan | 64ed93a | 2005-09-10 00:27:21 -0700 | [diff] [blame] | 287 | extern signed long schedule_timeout_interruptible(signed long timeout); |
| 288 | extern signed long schedule_timeout_uninterruptible(signed long timeout); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | asmlinkage void schedule(void); |
| 290 | |
Serge E. Hallyn | ab51601 | 2006-10-02 02:18:06 -0700 | [diff] [blame] | 291 | struct nsproxy; |
Cedric Le Goater | acce292 | 2007-07-15 23:40:59 -0700 | [diff] [blame] | 292 | struct user_namespace; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | |
| 294 | /* Maximum number of active map areas.. This is a random (large) number */ |
| 295 | #define DEFAULT_MAX_MAP_COUNT 65536 |
| 296 | |
| 297 | extern int sysctl_max_map_count; |
| 298 | |
| 299 | #include <linux/aio.h> |
| 300 | |
| 301 | extern unsigned long |
| 302 | arch_get_unmapped_area(struct file *, unsigned long, unsigned long, |
| 303 | unsigned long, unsigned long); |
| 304 | extern unsigned long |
| 305 | arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, |
| 306 | unsigned long len, unsigned long pgoff, |
| 307 | unsigned long flags); |
Wolfgang Wander | 1363c3c | 2005-06-21 17:14:49 -0700 | [diff] [blame] | 308 | extern void arch_unmap_area(struct mm_struct *, unsigned long); |
| 309 | extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | |
Hugh Dickins | f412ac0 | 2005-10-29 18:16:41 -0700 | [diff] [blame] | 311 | #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS |
| 312 | /* |
| 313 | * The mm counters are not protected by its page_table_lock, |
| 314 | * so must be incremented atomically. |
| 315 | */ |
Christoph Lameter | d3cb487 | 2006-01-06 00:11:20 -0800 | [diff] [blame] | 316 | #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value) |
| 317 | #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member)) |
| 318 | #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member) |
| 319 | #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member) |
| 320 | #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member) |
| 321 | typedef atomic_long_t mm_counter_t; |
Hugh Dickins | f412ac0 | 2005-10-29 18:16:41 -0700 | [diff] [blame] | 322 | |
| 323 | #else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */ |
| 324 | /* |
| 325 | * The mm counters are protected by its page_table_lock, |
| 326 | * so can be incremented directly. |
| 327 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | #define set_mm_counter(mm, member, value) (mm)->_##member = (value) |
| 329 | #define get_mm_counter(mm, member) ((mm)->_##member) |
| 330 | #define add_mm_counter(mm, member, value) (mm)->_##member += (value) |
| 331 | #define inc_mm_counter(mm, member) (mm)->_##member++ |
| 332 | #define dec_mm_counter(mm, member) (mm)->_##member-- |
Hugh Dickins | f412ac0 | 2005-10-29 18:16:41 -0700 | [diff] [blame] | 333 | typedef unsigned long mm_counter_t; |
Hugh Dickins | 4294621 | 2005-10-29 18:16:05 -0700 | [diff] [blame] | 334 | |
Hugh Dickins | f412ac0 | 2005-10-29 18:16:41 -0700 | [diff] [blame] | 335 | #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */ |
| 336 | |
| 337 | #define get_mm_rss(mm) \ |
| 338 | (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss)) |
Hugh Dickins | 365e9c87 | 2005-10-29 18:16:18 -0700 | [diff] [blame] | 339 | #define update_hiwater_rss(mm) do { \ |
| 340 | unsigned long _rss = get_mm_rss(mm); \ |
| 341 | if ((mm)->hiwater_rss < _rss) \ |
| 342 | (mm)->hiwater_rss = _rss; \ |
| 343 | } while (0) |
| 344 | #define update_hiwater_vm(mm) do { \ |
| 345 | if ((mm)->hiwater_vm < (mm)->total_vm) \ |
| 346 | (mm)->hiwater_vm = (mm)->total_vm; \ |
| 347 | } while (0) |
| 348 | |
Kawai, Hidehiro | 6c5d523 | 2007-07-19 01:48:27 -0700 | [diff] [blame] | 349 | extern void set_dumpable(struct mm_struct *mm, int value); |
| 350 | extern int get_dumpable(struct mm_struct *mm); |
| 351 | |
| 352 | /* mm flags */ |
Kawai, Hidehiro | 3cb4a0b | 2007-07-19 01:48:28 -0700 | [diff] [blame] | 353 | /* dumpable bits */ |
Kawai, Hidehiro | 6c5d523 | 2007-07-19 01:48:27 -0700 | [diff] [blame] | 354 | #define MMF_DUMPABLE 0 /* core dump is permitted */ |
| 355 | #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */ |
Kawai, Hidehiro | 3cb4a0b | 2007-07-19 01:48:28 -0700 | [diff] [blame] | 356 | #define MMF_DUMPABLE_BITS 2 |
| 357 | |
| 358 | /* coredump filter bits */ |
| 359 | #define MMF_DUMP_ANON_PRIVATE 2 |
| 360 | #define MMF_DUMP_ANON_SHARED 3 |
| 361 | #define MMF_DUMP_MAPPED_PRIVATE 4 |
| 362 | #define MMF_DUMP_MAPPED_SHARED 5 |
| 363 | #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS |
| 364 | #define MMF_DUMP_FILTER_BITS 4 |
| 365 | #define MMF_DUMP_FILTER_MASK \ |
| 366 | (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT) |
| 367 | #define MMF_DUMP_FILTER_DEFAULT \ |
| 368 | ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED)) |
Kawai, Hidehiro | 6c5d523 | 2007-07-19 01:48:27 -0700 | [diff] [blame] | 369 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | struct mm_struct { |
| 371 | struct vm_area_struct * mmap; /* list of VMAs */ |
| 372 | struct rb_root mm_rb; |
| 373 | struct vm_area_struct * mmap_cache; /* last find_vma result */ |
| 374 | unsigned long (*get_unmapped_area) (struct file *filp, |
| 375 | unsigned long addr, unsigned long len, |
| 376 | unsigned long pgoff, unsigned long flags); |
Wolfgang Wander | 1363c3c | 2005-06-21 17:14:49 -0700 | [diff] [blame] | 377 | void (*unmap_area) (struct mm_struct *mm, unsigned long addr); |
Benjamin Herrenschmidt | 0551fbd | 2006-02-28 16:59:19 -0800 | [diff] [blame] | 378 | unsigned long mmap_base; /* base of mmap area */ |
| 379 | unsigned long task_size; /* size of task vm space */ |
| 380 | unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */ |
Wolfgang Wander | 1363c3c | 2005-06-21 17:14:49 -0700 | [diff] [blame] | 381 | unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | pgd_t * pgd; |
| 383 | atomic_t mm_users; /* How many users with user space? */ |
| 384 | atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */ |
| 385 | int map_count; /* number of VMAs */ |
| 386 | struct rw_semaphore mmap_sem; |
| 387 | spinlock_t page_table_lock; /* Protects page tables and some counters */ |
| 388 | |
| 389 | struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung |
| 390 | * together off init_mm.mmlist, and are protected |
| 391 | * by mmlist_lock |
| 392 | */ |
| 393 | |
Hugh Dickins | f412ac0 | 2005-10-29 18:16:41 -0700 | [diff] [blame] | 394 | /* Special counters, in some configurations protected by the |
| 395 | * page_table_lock, in other configurations by being atomic. |
| 396 | */ |
Hugh Dickins | 4294621 | 2005-10-29 18:16:05 -0700 | [diff] [blame] | 397 | mm_counter_t _file_rss; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | mm_counter_t _anon_rss; |
| 399 | |
Hugh Dickins | f449952 | 2005-10-29 18:16:19 -0700 | [diff] [blame] | 400 | unsigned long hiwater_rss; /* High-watermark of RSS usage */ |
| 401 | unsigned long hiwater_vm; /* High-water virtual memory usage */ |
| 402 | |
| 403 | unsigned long total_vm, locked_vm, shared_vm, exec_vm; |
| 404 | unsigned long stack_vm, reserved_vm, def_flags, nr_ptes; |
| 405 | unsigned long start_code, end_code, start_data, end_data; |
| 406 | unsigned long start_brk, brk, start_stack; |
| 407 | unsigned long arg_start, arg_end, env_start, env_end; |
| 408 | |
H. J. Lu | 36d57ac | 2005-09-06 15:16:49 -0700 | [diff] [blame] | 409 | unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | cpumask_t cpu_vm_mask; |
| 412 | |
| 413 | /* Architecture-specific MM context */ |
| 414 | mm_context_t context; |
| 415 | |
Ashwin Chaugule | 7602bdf | 2006-12-06 20:31:57 -0800 | [diff] [blame] | 416 | /* Swap token stuff */ |
| 417 | /* |
| 418 | * Last value of global fault stamp as seen by this process. |
| 419 | * In other words, this value gives an indication of how long |
| 420 | * it has been since this task got the token. |
| 421 | * Look at mm/thrash.c |
| 422 | */ |
| 423 | unsigned int faultstamp; |
| 424 | unsigned int token_priority; |
| 425 | unsigned int last_interval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | |
Kawai, Hidehiro | 6c5d523 | 2007-07-19 01:48:27 -0700 | [diff] [blame] | 427 | unsigned long flags; /* Must use atomic bitops to access the bits */ |
Arnaldo Carvalho de Melo | 36de643 | 2006-12-06 20:33:42 -0800 | [diff] [blame] | 428 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | /* coredumping support */ |
| 430 | int core_waiters; |
| 431 | struct completion *core_startup_done, core_done; |
| 432 | |
| 433 | /* aio bits */ |
| 434 | rwlock_t ioctx_list_lock; |
| 435 | struct kioctx *ioctx_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | }; |
| 437 | |
| 438 | struct sighand_struct { |
| 439 | atomic_t count; |
| 440 | struct k_sigaction action[_NSIG]; |
| 441 | spinlock_t siglock; |
Davide Libenzi | b8fceee | 2007-09-20 12:40:16 -0700 | [diff] [blame] | 442 | wait_queue_head_t signalfd_wqh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | }; |
| 444 | |
KaiGai Kohei | 0e46481 | 2006-06-25 05:49:24 -0700 | [diff] [blame] | 445 | struct pacct_struct { |
KaiGai Kohei | f6ec29a | 2006-06-25 05:49:25 -0700 | [diff] [blame] | 446 | int ac_flag; |
| 447 | long ac_exitcode; |
KaiGai Kohei | 0e46481 | 2006-06-25 05:49:24 -0700 | [diff] [blame] | 448 | unsigned long ac_mem; |
KaiGai Kohei | 77787bf | 2006-06-25 05:49:26 -0700 | [diff] [blame] | 449 | cputime_t ac_utime, ac_stime; |
| 450 | unsigned long ac_minflt, ac_majflt; |
KaiGai Kohei | 0e46481 | 2006-06-25 05:49:24 -0700 | [diff] [blame] | 451 | }; |
| 452 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | /* |
| 454 | * NOTE! "signal_struct" does not have it's own |
| 455 | * locking, because a shared signal_struct always |
| 456 | * implies a shared sighand_struct, so locking |
| 457 | * sighand_struct is always a proper superset of |
| 458 | * the locking of signal_struct. |
| 459 | */ |
| 460 | struct signal_struct { |
| 461 | atomic_t count; |
| 462 | atomic_t live; |
| 463 | |
| 464 | wait_queue_head_t wait_chldexit; /* for wait4() */ |
| 465 | |
| 466 | /* current thread group signal load-balancing target: */ |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 467 | struct task_struct *curr_target; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | |
| 469 | /* shared signal handling: */ |
| 470 | struct sigpending shared_pending; |
| 471 | |
| 472 | /* thread group exit support */ |
| 473 | int group_exit_code; |
| 474 | /* overloaded: |
| 475 | * - notify group_exit_task when ->count is equal to notify_count |
| 476 | * - everyone except group_exit_task is stopped during signal delivery |
| 477 | * of fatal signals, group_exit_task processes the signal. |
| 478 | */ |
| 479 | struct task_struct *group_exit_task; |
| 480 | int notify_count; |
| 481 | |
| 482 | /* thread group stop support, overloads group_exit_code too */ |
| 483 | int group_stop_count; |
| 484 | unsigned int flags; /* see SIGNAL_* flags below */ |
| 485 | |
| 486 | /* POSIX.1b Interval Timers */ |
| 487 | struct list_head posix_timers; |
| 488 | |
| 489 | /* ITIMER_REAL timer for the process */ |
Thomas Gleixner | 2ff678b | 2006-01-09 20:52:34 -0800 | [diff] [blame] | 490 | struct hrtimer real_timer; |
Roman Zippel | 05cfb61 | 2006-03-26 01:38:12 -0800 | [diff] [blame] | 491 | struct task_struct *tsk; |
Thomas Gleixner | 2ff678b | 2006-01-09 20:52:34 -0800 | [diff] [blame] | 492 | ktime_t it_real_incr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | |
| 494 | /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */ |
| 495 | cputime_t it_prof_expires, it_virt_expires; |
| 496 | cputime_t it_prof_incr, it_virt_incr; |
| 497 | |
| 498 | /* job control IDs */ |
| 499 | pid_t pgrp; |
Eric W. Biederman | ab521dc | 2007-02-12 00:53:00 -0800 | [diff] [blame] | 500 | struct pid *tty_old_pgrp; |
Cedric Le Goater | 1ec320a | 2006-12-08 02:37:55 -0800 | [diff] [blame] | 501 | |
| 502 | union { |
| 503 | pid_t session __deprecated; |
| 504 | pid_t __session; |
| 505 | }; |
| 506 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | /* boolean value for session group leader */ |
| 508 | int leader; |
| 509 | |
| 510 | struct tty_struct *tty; /* NULL if no tty */ |
| 511 | |
| 512 | /* |
| 513 | * Cumulative resource counters for dead threads in the group, |
| 514 | * and for reaped dead child processes forked by this group. |
| 515 | * Live threads maintain their own counters and add to these |
| 516 | * in __exit_signal, except for the group leader. |
| 517 | */ |
| 518 | cputime_t utime, stime, cutime, cstime; |
| 519 | unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; |
| 520 | unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; |
Eric Dumazet | 6eaeeab | 2007-05-10 22:22:37 -0700 | [diff] [blame] | 521 | unsigned long inblock, oublock, cinblock, coublock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | |
| 523 | /* |
| 524 | * Cumulative ns of scheduled CPU time for dead threads in the |
| 525 | * group, not including a zombie group leader. (This only differs |
| 526 | * from jiffies_to_ns(utime + stime) if sched_clock uses something |
| 527 | * other than jiffies.) |
| 528 | */ |
Ingo Molnar | 41b86e9 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 529 | unsigned long long sum_sched_runtime; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | |
| 531 | /* |
| 532 | * We don't bother to synchronize most readers of this at all, |
| 533 | * because there is no reader checking a limit that actually needs |
| 534 | * to get both rlim_cur and rlim_max atomically, and either one |
| 535 | * alone is a single word that can safely be read normally. |
| 536 | * getrlimit/setrlimit use task_lock(current->group_leader) to |
| 537 | * protect this instead of the siglock, because they really |
| 538 | * have no need to disable irqs. |
| 539 | */ |
| 540 | struct rlimit rlim[RLIM_NLIMITS]; |
| 541 | |
| 542 | struct list_head cpu_timers[3]; |
| 543 | |
| 544 | /* keep the process-shared keyrings here so that they do the right |
| 545 | * thing in threads created with CLONE_THREAD */ |
| 546 | #ifdef CONFIG_KEYS |
| 547 | struct key *session_keyring; /* keyring inherited over fork */ |
| 548 | struct key *process_keyring; /* keyring private to this process */ |
| 549 | #endif |
KaiGai Kohei | 0e46481 | 2006-06-25 05:49:24 -0700 | [diff] [blame] | 550 | #ifdef CONFIG_BSD_PROCESS_ACCT |
| 551 | struct pacct_struct pacct; /* per-process accounting information */ |
| 552 | #endif |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 553 | #ifdef CONFIG_TASKSTATS |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 554 | struct taskstats *stats; |
| 555 | #endif |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 556 | #ifdef CONFIG_AUDIT |
| 557 | unsigned audit_tty; |
| 558 | struct tty_audit_buf *tty_audit_buf; |
| 559 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | }; |
| 561 | |
Nick Piggin | 4866cde | 2005-06-25 14:57:23 -0700 | [diff] [blame] | 562 | /* Context switch must be unlocked if interrupts are to be enabled */ |
| 563 | #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW |
| 564 | # define __ARCH_WANT_UNLOCKED_CTXSW |
| 565 | #endif |
| 566 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | /* |
| 568 | * Bits in flags field of signal_struct. |
| 569 | */ |
| 570 | #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ |
| 571 | #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */ |
| 572 | #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */ |
| 573 | #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */ |
| 574 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | /* |
| 576 | * Some day this will be a full-fledged user tracking system.. |
| 577 | */ |
| 578 | struct user_struct { |
| 579 | atomic_t __count; /* reference count */ |
| 580 | atomic_t processes; /* How many processes does this user have? */ |
| 581 | atomic_t files; /* How many open files does this user have? */ |
| 582 | atomic_t sigpending; /* How many pending signals does this user have? */ |
Amy Griffis | 2d9048e | 2006-06-01 13:10:59 -0700 | [diff] [blame] | 583 | #ifdef CONFIG_INOTIFY_USER |
Robert Love | 0eeca28 | 2005-07-12 17:06:03 -0400 | [diff] [blame] | 584 | atomic_t inotify_watches; /* How many inotify watches does this user have? */ |
| 585 | atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ |
| 586 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | /* protected by mq_lock */ |
| 588 | unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ |
| 589 | unsigned long locked_shm; /* How many pages of mlocked shm ? */ |
| 590 | |
| 591 | #ifdef CONFIG_KEYS |
| 592 | struct key *uid_keyring; /* UID specific keyring */ |
| 593 | struct key *session_keyring; /* UID's default session keyring */ |
| 594 | #endif |
| 595 | |
| 596 | /* Hash table maintenance information */ |
Pavel Emelyanov | 735de22 | 2007-09-18 22:46:44 -0700 | [diff] [blame] | 597 | struct hlist_node uidhash_node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | uid_t uid; |
| 599 | }; |
| 600 | |
| 601 | extern struct user_struct *find_user(uid_t); |
| 602 | |
| 603 | extern struct user_struct root_user; |
| 604 | #define INIT_USER (&root_user) |
| 605 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | struct backing_dev_info; |
| 607 | struct reclaim_state; |
| 608 | |
Chandra Seetharaman | 52f17b6 | 2006-07-14 00:24:38 -0700 | [diff] [blame] | 609 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | struct sched_info { |
| 611 | /* cumulative counters */ |
Balbir Singh | 172ba84 | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 612 | unsigned long pcnt; /* # of times run on this cpu */ |
| 613 | unsigned long long cpu_time, /* time spent on the cpu */ |
| 614 | run_delay; /* time spent waiting on a runqueue */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | |
| 616 | /* timestamps */ |
Balbir Singh | 172ba84 | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 617 | unsigned long long last_arrival,/* when we last ran on a cpu */ |
| 618 | last_queued; /* when we were last queued to run */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | }; |
Chandra Seetharaman | 52f17b6 | 2006-07-14 00:24:38 -0700 | [diff] [blame] | 620 | #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | |
Chandra Seetharaman | 52f17b6 | 2006-07-14 00:24:38 -0700 | [diff] [blame] | 622 | #ifdef CONFIG_SCHEDSTATS |
Helge Deller | 15ad7cd | 2006-12-06 20:40:36 -0800 | [diff] [blame] | 623 | extern const struct file_operations proc_schedstat_operations; |
Chandra Seetharaman | 52f17b6 | 2006-07-14 00:24:38 -0700 | [diff] [blame] | 624 | #endif /* CONFIG_SCHEDSTATS */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 626 | #ifdef CONFIG_TASK_DELAY_ACCT |
| 627 | struct task_delay_info { |
| 628 | spinlock_t lock; |
| 629 | unsigned int flags; /* Private per-task flags */ |
| 630 | |
| 631 | /* For each stat XXX, add following, aligned appropriately |
| 632 | * |
| 633 | * struct timespec XXX_start, XXX_end; |
| 634 | * u64 XXX_delay; |
| 635 | * u32 XXX_count; |
| 636 | * |
| 637 | * Atomicity of updates to XXX_delay, XXX_count protected by |
| 638 | * single lock above (split into XXX_lock if contention is an issue). |
| 639 | */ |
Shailabh Nagar | 0ff9224 | 2006-07-14 00:24:37 -0700 | [diff] [blame] | 640 | |
| 641 | /* |
| 642 | * XXX_count is incremented on every XXX operation, the delay |
| 643 | * associated with the operation is added to XXX_delay. |
| 644 | * XXX_delay contains the accumulated delay time in nanoseconds. |
| 645 | */ |
| 646 | struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */ |
| 647 | u64 blkio_delay; /* wait for sync block io completion */ |
| 648 | u64 swapin_delay; /* wait for swapin block io completion */ |
| 649 | u32 blkio_count; /* total count of the number of sync block */ |
| 650 | /* io operations performed */ |
| 651 | u32 swapin_count; /* total count of the number of swapin block */ |
| 652 | /* io operations performed */ |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 653 | }; |
Chandra Seetharaman | 52f17b6 | 2006-07-14 00:24:38 -0700 | [diff] [blame] | 654 | #endif /* CONFIG_TASK_DELAY_ACCT */ |
| 655 | |
| 656 | static inline int sched_info_on(void) |
| 657 | { |
| 658 | #ifdef CONFIG_SCHEDSTATS |
| 659 | return 1; |
| 660 | #elif defined(CONFIG_TASK_DELAY_ACCT) |
| 661 | extern int delayacct_on; |
| 662 | return delayacct_on; |
| 663 | #else |
| 664 | return 0; |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 665 | #endif |
Chandra Seetharaman | 52f17b6 | 2006-07-14 00:24:38 -0700 | [diff] [blame] | 666 | } |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 667 | |
Ingo Molnar | d15bcfd | 2007-07-09 18:51:57 +0200 | [diff] [blame] | 668 | enum cpu_idle_type { |
| 669 | CPU_IDLE, |
| 670 | CPU_NOT_IDLE, |
| 671 | CPU_NEWLY_IDLE, |
| 672 | CPU_MAX_IDLE_TYPES |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | }; |
| 674 | |
| 675 | /* |
| 676 | * sched-domains (multiprocessor balancing) declarations: |
| 677 | */ |
Ingo Molnar | 9aa7b36 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 678 | |
| 679 | /* |
| 680 | * Increase resolution of nice-level calculations: |
| 681 | */ |
| 682 | #define SCHED_LOAD_SHIFT 10 |
| 683 | #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT) |
| 684 | |
Suresh Siddha | f8700df | 2007-08-23 15:18:02 +0200 | [diff] [blame] | 685 | #define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | |
Peter Williams | 2dd73a4 | 2006-06-27 02:54:34 -0700 | [diff] [blame] | 687 | #ifdef CONFIG_SMP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */ |
| 689 | #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */ |
| 690 | #define SD_BALANCE_EXEC 4 /* Balance on exec */ |
Nick Piggin | 147cbb4 | 2005-06-25 14:57:19 -0700 | [diff] [blame] | 691 | #define SD_BALANCE_FORK 8 /* Balance on fork, clone */ |
| 692 | #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */ |
| 693 | #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */ |
| 694 | #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */ |
| 695 | #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */ |
Siddha, Suresh B | 5c45bf2 | 2006-06-27 02:54:42 -0700 | [diff] [blame] | 696 | #define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */ |
Siddha, Suresh B | 89c4710 | 2006-10-03 01:14:09 -0700 | [diff] [blame] | 697 | #define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */ |
Christoph Lameter | 08c183f | 2006-12-10 02:20:29 -0800 | [diff] [blame] | 698 | #define SD_SERIALIZE 1024 /* Only a single load balancing instance */ |
Siddha, Suresh B | 5c45bf2 | 2006-06-27 02:54:42 -0700 | [diff] [blame] | 699 | |
Siddha, Suresh B | 89c4710 | 2006-10-03 01:14:09 -0700 | [diff] [blame] | 700 | #define BALANCE_FOR_MC_POWER \ |
| 701 | (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0) |
| 702 | |
| 703 | #define BALANCE_FOR_PKG_POWER \ |
| 704 | ((sched_mc_power_savings || sched_smt_power_savings) ? \ |
| 705 | SD_POWERSAVINGS_BALANCE : 0) |
| 706 | |
| 707 | #define test_sd_parent(sd, flag) ((sd->parent && \ |
| 708 | (sd->parent->flags & flag)) ? 1 : 0) |
Siddha, Suresh B | 5c45bf2 | 2006-06-27 02:54:42 -0700 | [diff] [blame] | 709 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | |
| 711 | struct sched_group { |
| 712 | struct sched_group *next; /* Must be a circular list */ |
| 713 | cpumask_t cpumask; |
| 714 | |
| 715 | /* |
| 716 | * CPU power of this group, SCHED_LOAD_SCALE being max power for a |
| 717 | * single CPU. This is read only (except for setup, hotplug CPU). |
Eric Dumazet | 5517d86 | 2007-05-08 00:32:57 -0700 | [diff] [blame] | 718 | * Note : Never change cpu_power without recompute its reciprocal |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | */ |
Eric Dumazet | 5517d86 | 2007-05-08 00:32:57 -0700 | [diff] [blame] | 720 | unsigned int __cpu_power; |
| 721 | /* |
| 722 | * reciprocal value of cpu_power to avoid expensive divides |
| 723 | * (see include/linux/reciprocal_div.h) |
| 724 | */ |
| 725 | u32 reciprocal_cpu_power; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | }; |
| 727 | |
| 728 | struct sched_domain { |
| 729 | /* These fields must be setup */ |
| 730 | struct sched_domain *parent; /* top domain must be null terminated */ |
Siddha, Suresh B | 1a84887 | 2006-10-03 01:14:08 -0700 | [diff] [blame] | 731 | struct sched_domain *child; /* bottom domain must be null terminated */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | struct sched_group *groups; /* the balancing groups of the domain */ |
| 733 | cpumask_t span; /* span of all CPUs in this domain */ |
| 734 | unsigned long min_interval; /* Minimum balance interval ms */ |
| 735 | unsigned long max_interval; /* Maximum balance interval ms */ |
| 736 | unsigned int busy_factor; /* less balancing by factor if busy */ |
| 737 | unsigned int imbalance_pct; /* No balance until over watermark */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ |
Nick Piggin | 7897986 | 2005-06-25 14:57:13 -0700 | [diff] [blame] | 739 | unsigned int busy_idx; |
| 740 | unsigned int idle_idx; |
| 741 | unsigned int newidle_idx; |
| 742 | unsigned int wake_idx; |
Nick Piggin | 147cbb4 | 2005-06-25 14:57:19 -0700 | [diff] [blame] | 743 | unsigned int forkexec_idx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | int flags; /* See SD_* */ |
| 745 | |
| 746 | /* Runtime fields. */ |
| 747 | unsigned long last_balance; /* init to jiffies. units in jiffies */ |
| 748 | unsigned int balance_interval; /* initialise to 1. units in ms. */ |
| 749 | unsigned int nr_balance_failed; /* initialise to 0 */ |
| 750 | |
| 751 | #ifdef CONFIG_SCHEDSTATS |
| 752 | /* load_balance() stats */ |
Ingo Molnar | d15bcfd | 2007-07-09 18:51:57 +0200 | [diff] [blame] | 753 | unsigned long lb_cnt[CPU_MAX_IDLE_TYPES]; |
| 754 | unsigned long lb_failed[CPU_MAX_IDLE_TYPES]; |
| 755 | unsigned long lb_balanced[CPU_MAX_IDLE_TYPES]; |
| 756 | unsigned long lb_imbalance[CPU_MAX_IDLE_TYPES]; |
| 757 | unsigned long lb_gained[CPU_MAX_IDLE_TYPES]; |
| 758 | unsigned long lb_hot_gained[CPU_MAX_IDLE_TYPES]; |
| 759 | unsigned long lb_nobusyg[CPU_MAX_IDLE_TYPES]; |
| 760 | unsigned long lb_nobusyq[CPU_MAX_IDLE_TYPES]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | |
| 762 | /* Active load balancing */ |
| 763 | unsigned long alb_cnt; |
| 764 | unsigned long alb_failed; |
| 765 | unsigned long alb_pushed; |
| 766 | |
Nick Piggin | 68767a0 | 2005-06-25 14:57:20 -0700 | [diff] [blame] | 767 | /* SD_BALANCE_EXEC stats */ |
| 768 | unsigned long sbe_cnt; |
| 769 | unsigned long sbe_balanced; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | unsigned long sbe_pushed; |
| 771 | |
Nick Piggin | 68767a0 | 2005-06-25 14:57:20 -0700 | [diff] [blame] | 772 | /* SD_BALANCE_FORK stats */ |
| 773 | unsigned long sbf_cnt; |
| 774 | unsigned long sbf_balanced; |
| 775 | unsigned long sbf_pushed; |
| 776 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | /* try_to_wake_up() stats */ |
| 778 | unsigned long ttwu_wake_remote; |
| 779 | unsigned long ttwu_move_affine; |
| 780 | unsigned long ttwu_move_balance; |
| 781 | #endif |
| 782 | }; |
| 783 | |
Srivatsa Vaddagiri | 51888ca | 2006-06-27 02:54:38 -0700 | [diff] [blame] | 784 | extern int partition_sched_domains(cpumask_t *partition1, |
Dinakar Guniguntala | 1a20ff2 | 2005-06-25 14:57:33 -0700 | [diff] [blame] | 785 | cpumask_t *partition2); |
akpm@osdl.org | 198e2f1 | 2006-01-12 01:05:30 -0800 | [diff] [blame] | 786 | |
akpm@osdl.org | 198e2f1 | 2006-01-12 01:05:30 -0800 | [diff] [blame] | 787 | #endif /* CONFIG_SMP */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | |
Con Kolivas | d02c7a8 | 2007-07-26 13:40:43 +0200 | [diff] [blame] | 789 | /* |
| 790 | * A runqueue laden with a single nice 0 task scores a weighted_cpuload of |
| 791 | * SCHED_LOAD_SCALE. This function returns 1 if any cpu is laden with a |
| 792 | * task of nice 0 or enough lower priority tasks to bring up the |
| 793 | * weighted_cpuload |
| 794 | */ |
| 795 | static inline int above_background_load(void) |
| 796 | { |
| 797 | unsigned long cpu; |
| 798 | |
| 799 | for_each_online_cpu(cpu) { |
| 800 | if (weighted_cpuload(cpu) >= SCHED_LOAD_SCALE) |
| 801 | return 1; |
| 802 | } |
| 803 | return 0; |
| 804 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | |
| 806 | struct io_context; /* See blkdev.h */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | struct cpuset; |
| 808 | |
| 809 | #define NGROUPS_SMALL 32 |
| 810 | #define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t))) |
| 811 | struct group_info { |
| 812 | int ngroups; |
| 813 | atomic_t usage; |
| 814 | gid_t small_block[NGROUPS_SMALL]; |
| 815 | int nblocks; |
| 816 | gid_t *blocks[0]; |
| 817 | }; |
| 818 | |
| 819 | /* |
| 820 | * get_group_info() must be called with the owning task locked (via task_lock()) |
| 821 | * when task != current. The reason being that the vast majority of callers are |
| 822 | * looking at current->group_info, which can not be changed except by the |
| 823 | * current task. Changing current->group_info requires the task lock, too. |
| 824 | */ |
| 825 | #define get_group_info(group_info) do { \ |
| 826 | atomic_inc(&(group_info)->usage); \ |
| 827 | } while (0) |
| 828 | |
| 829 | #define put_group_info(group_info) do { \ |
| 830 | if (atomic_dec_and_test(&(group_info)->usage)) \ |
| 831 | groups_free(group_info); \ |
| 832 | } while (0) |
| 833 | |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 834 | extern struct group_info *groups_alloc(int gidsetsize); |
| 835 | extern void groups_free(struct group_info *group_info); |
| 836 | extern int set_current_groups(struct group_info *group_info); |
| 837 | extern int groups_search(struct group_info *group_info, gid_t grp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | /* access the groups "array" with this macro */ |
| 839 | #define GROUP_AT(gi, i) \ |
| 840 | ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK]) |
| 841 | |
Chen, Kenneth W | 383f283 | 2005-09-09 13:02:02 -0700 | [diff] [blame] | 842 | #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 843 | extern void prefetch_stack(struct task_struct *t); |
Chen, Kenneth W | 383f283 | 2005-09-09 13:02:02 -0700 | [diff] [blame] | 844 | #else |
| 845 | static inline void prefetch_stack(struct task_struct *t) { } |
| 846 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | |
| 848 | struct audit_context; /* See audit.c */ |
| 849 | struct mempolicy; |
Jens Axboe | b92ce55 | 2006-04-11 13:52:07 +0200 | [diff] [blame] | 850 | struct pipe_inode_info; |
Serge E. Hallyn | 4865ecf | 2006-10-02 02:18:14 -0700 | [diff] [blame] | 851 | struct uts_namespace; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 853 | struct rq; |
| 854 | struct sched_domain; |
| 855 | |
| 856 | struct sched_class { |
| 857 | struct sched_class *next; |
| 858 | |
Ingo Molnar | fd390f6 | 2007-08-09 11:16:48 +0200 | [diff] [blame] | 859 | void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup); |
Ingo Molnar | f02231e | 2007-08-09 11:16:48 +0200 | [diff] [blame] | 860 | void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep); |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 861 | void (*yield_task) (struct rq *rq, struct task_struct *p); |
| 862 | |
| 863 | void (*check_preempt_curr) (struct rq *rq, struct task_struct *p); |
| 864 | |
Ingo Molnar | fb8d472 | 2007-08-09 11:16:48 +0200 | [diff] [blame] | 865 | struct task_struct * (*pick_next_task) (struct rq *rq); |
Ingo Molnar | 31ee529 | 2007-08-09 11:16:49 +0200 | [diff] [blame] | 866 | void (*put_prev_task) (struct rq *rq, struct task_struct *p); |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 867 | |
Peter Williams | 4301065 | 2007-08-09 11:16:46 +0200 | [diff] [blame] | 868 | unsigned long (*load_balance) (struct rq *this_rq, int this_cpu, |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 869 | struct rq *busiest, |
| 870 | unsigned long max_nr_move, unsigned long max_load_move, |
| 871 | struct sched_domain *sd, enum cpu_idle_type idle, |
Peter Williams | a4ac01c | 2007-08-09 11:16:46 +0200 | [diff] [blame] | 872 | int *all_pinned, int *this_best_prio); |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 873 | |
| 874 | void (*set_curr_task) (struct rq *rq); |
| 875 | void (*task_tick) (struct rq *rq, struct task_struct *p); |
Ingo Molnar | ee0827d | 2007-08-09 11:16:49 +0200 | [diff] [blame] | 876 | void (*task_new) (struct rq *rq, struct task_struct *p); |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 877 | }; |
| 878 | |
| 879 | struct load_weight { |
| 880 | unsigned long weight, inv_weight; |
| 881 | }; |
| 882 | |
| 883 | /* |
| 884 | * CFS stats for a schedulable entity (task, task-group etc) |
| 885 | * |
| 886 | * Current field usage histogram: |
| 887 | * |
| 888 | * 4 se->block_start |
| 889 | * 4 se->run_node |
| 890 | * 4 se->sleep_start |
| 891 | * 4 se->sleep_start_fair |
| 892 | * 6 se->load.weight |
| 893 | * 7 se->delta_fair |
| 894 | * 15 se->wait_runtime |
| 895 | */ |
| 896 | struct sched_entity { |
| 897 | long wait_runtime; |
| 898 | unsigned long delta_fair_run; |
| 899 | unsigned long delta_fair_sleep; |
| 900 | unsigned long delta_exec; |
| 901 | s64 fair_key; |
| 902 | struct load_weight load; /* for load-balancing */ |
| 903 | struct rb_node run_node; |
| 904 | unsigned int on_rq; |
| 905 | |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 906 | u64 exec_start; |
Ingo Molnar | 94c1822 | 2007-08-02 17:41:40 +0200 | [diff] [blame] | 907 | u64 sum_exec_runtime; |
Ingo Molnar | f6cf891 | 2007-08-28 12:53:24 +0200 | [diff] [blame] | 908 | u64 prev_sum_exec_runtime; |
Ingo Molnar | 94c1822 | 2007-08-02 17:41:40 +0200 | [diff] [blame] | 909 | u64 wait_start_fair; |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 910 | u64 sleep_start_fair; |
Ingo Molnar | 94c1822 | 2007-08-02 17:41:40 +0200 | [diff] [blame] | 911 | |
| 912 | #ifdef CONFIG_SCHEDSTATS |
| 913 | u64 wait_start; |
| 914 | u64 wait_max; |
| 915 | s64 sum_wait_runtime; |
| 916 | |
| 917 | u64 sleep_start; |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 918 | u64 sleep_max; |
Ingo Molnar | 94c1822 | 2007-08-02 17:41:40 +0200 | [diff] [blame] | 919 | s64 sum_sleep_runtime; |
| 920 | |
| 921 | u64 block_start; |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 922 | u64 block_max; |
| 923 | u64 exec_max; |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 924 | |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 925 | unsigned long wait_runtime_overruns; |
| 926 | unsigned long wait_runtime_underruns; |
Ingo Molnar | 94c1822 | 2007-08-02 17:41:40 +0200 | [diff] [blame] | 927 | #endif |
| 928 | |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 929 | #ifdef CONFIG_FAIR_GROUP_SCHED |
| 930 | struct sched_entity *parent; |
| 931 | /* rq on which this entity is (to be) queued: */ |
| 932 | struct cfs_rq *cfs_rq; |
| 933 | /* rq "owned" by this entity/group: */ |
| 934 | struct cfs_rq *my_q; |
| 935 | #endif |
| 936 | }; |
Ingo Molnar | 70b97a7 | 2006-07-03 00:25:42 -0700 | [diff] [blame] | 937 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | struct task_struct { |
| 939 | volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ |
Roman Zippel | f7e4217 | 2007-05-09 02:35:17 -0700 | [diff] [blame] | 940 | void *stack; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | atomic_t usage; |
William Cohen | 97dc32c | 2007-05-08 00:23:41 -0700 | [diff] [blame] | 942 | unsigned int flags; /* per process flags, defined below */ |
| 943 | unsigned int ptrace; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | |
Paolo 'Blaisorblade' Giarrusso | 3677209 | 2005-05-05 16:16:12 -0700 | [diff] [blame] | 945 | int lock_depth; /* BKL lock depth */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | |
Peter Williams | 2dd73a4 | 2006-06-27 02:54:34 -0700 | [diff] [blame] | 947 | #ifdef CONFIG_SMP |
| 948 | #ifdef __ARCH_WANT_UNLOCKED_CTXSW |
Nick Piggin | 4866cde | 2005-06-25 14:57:23 -0700 | [diff] [blame] | 949 | int oncpu; |
| 950 | #endif |
Peter Williams | 2dd73a4 | 2006-06-27 02:54:34 -0700 | [diff] [blame] | 951 | #endif |
Ingo Molnar | 50e645a | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 952 | |
Ingo Molnar | b29739f | 2006-06-27 02:54:51 -0700 | [diff] [blame] | 953 | int prio, static_prio, normal_prio; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | struct list_head run_list; |
Ingo Molnar | 20b8a59 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 955 | struct sched_class *sched_class; |
| 956 | struct sched_entity se; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | |
Avi Kivity | e107be3 | 2007-07-26 13:40:43 +0200 | [diff] [blame] | 958 | #ifdef CONFIG_PREEMPT_NOTIFIERS |
| 959 | /* list of struct preempt_notifier: */ |
| 960 | struct hlist_head preempt_notifiers; |
| 961 | #endif |
| 962 | |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 963 | unsigned short ioprio; |
Alexey Dobriyan | 6c5c934 | 2006-09-29 01:59:40 -0700 | [diff] [blame] | 964 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
Jens Axboe | 2056a78 | 2006-03-23 20:00:26 +0100 | [diff] [blame] | 965 | unsigned int btrace_seq; |
Alexey Dobriyan | 6c5c934 | 2006-09-29 01:59:40 -0700 | [diff] [blame] | 966 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | |
William Cohen | 97dc32c | 2007-05-08 00:23:41 -0700 | [diff] [blame] | 968 | unsigned int policy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | cpumask_t cpus_allowed; |
Ingo Molnar | 50e645a | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 970 | unsigned int time_slice; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | |
Chandra Seetharaman | 52f17b6 | 2006-07-14 00:24:38 -0700 | [diff] [blame] | 972 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | struct sched_info sched_info; |
| 974 | #endif |
| 975 | |
| 976 | struct list_head tasks; |
| 977 | /* |
| 978 | * ptrace_list/ptrace_children forms the list of my children |
| 979 | * that were stolen by a ptracer. |
| 980 | */ |
| 981 | struct list_head ptrace_children; |
| 982 | struct list_head ptrace_list; |
| 983 | |
| 984 | struct mm_struct *mm, *active_mm; |
| 985 | |
| 986 | /* task state */ |
| 987 | struct linux_binfmt *binfmt; |
William Cohen | 97dc32c | 2007-05-08 00:23:41 -0700 | [diff] [blame] | 988 | int exit_state; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | int exit_code, exit_signal; |
| 990 | int pdeath_signal; /* The signal sent when the parent dies */ |
| 991 | /* ??? */ |
William Cohen | 97dc32c | 2007-05-08 00:23:41 -0700 | [diff] [blame] | 992 | unsigned int personality; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | unsigned did_exec:1; |
| 994 | pid_t pid; |
| 995 | pid_t tgid; |
Arjan van de Ven | 0a42540 | 2006-09-26 10:52:38 +0200 | [diff] [blame] | 996 | |
| 997 | #ifdef CONFIG_CC_STACKPROTECTOR |
| 998 | /* Canary value for the -fstack-protector gcc feature */ |
| 999 | unsigned long stack_canary; |
| 1000 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1001 | /* |
| 1002 | * pointers to (original) parent process, youngest child, younger sibling, |
| 1003 | * older sibling, respectively. (p->father can be replaced with |
| 1004 | * p->parent->pid) |
| 1005 | */ |
| 1006 | struct task_struct *real_parent; /* real parent process (when being debugged) */ |
| 1007 | struct task_struct *parent; /* parent process */ |
| 1008 | /* |
| 1009 | * children/sibling forms the list of my children plus the |
| 1010 | * tasks I'm ptracing. |
| 1011 | */ |
| 1012 | struct list_head children; /* list of my children */ |
| 1013 | struct list_head sibling; /* linkage in my parent's children list */ |
| 1014 | struct task_struct *group_leader; /* threadgroup leader */ |
| 1015 | |
| 1016 | /* PID/PID hash table linkage. */ |
Eric W. Biederman | 92476d7 | 2006-03-31 02:31:42 -0800 | [diff] [blame] | 1017 | struct pid_link pids[PIDTYPE_MAX]; |
Oleg Nesterov | 47e6532 | 2006-03-28 16:11:25 -0800 | [diff] [blame] | 1018 | struct list_head thread_group; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | |
| 1020 | struct completion *vfork_done; /* for vfork() */ |
| 1021 | int __user *set_child_tid; /* CLONE_CHILD_SETTID */ |
| 1022 | int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ |
| 1023 | |
William Cohen | 97dc32c | 2007-05-08 00:23:41 -0700 | [diff] [blame] | 1024 | unsigned int rt_priority; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | cputime_t utime, stime; |
| 1026 | unsigned long nvcsw, nivcsw; /* context switch counts */ |
Tomas Janousek | 924b42d | 2007-07-15 23:39:42 -0700 | [diff] [blame] | 1027 | struct timespec start_time; /* monotonic time */ |
| 1028 | struct timespec real_start_time; /* boot based time */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ |
| 1030 | unsigned long min_flt, maj_flt; |
| 1031 | |
| 1032 | cputime_t it_prof_expires, it_virt_expires; |
| 1033 | unsigned long long it_sched_expires; |
| 1034 | struct list_head cpu_timers[3]; |
| 1035 | |
| 1036 | /* process credentials */ |
| 1037 | uid_t uid,euid,suid,fsuid; |
| 1038 | gid_t gid,egid,sgid,fsgid; |
| 1039 | struct group_info *group_info; |
| 1040 | kernel_cap_t cap_effective, cap_inheritable, cap_permitted; |
| 1041 | unsigned keep_capabilities:1; |
| 1042 | struct user_struct *user; |
| 1043 | #ifdef CONFIG_KEYS |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 1044 | struct key *request_key_auth; /* assumed request_key authority */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1045 | struct key *thread_keyring; /* keyring private to this thread */ |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 1046 | unsigned char jit_keyring; /* default keyring to attach requested keys to */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | #endif |
Arjan van de Ven | e07e23e | 2006-09-26 10:52:36 +0200 | [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; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | int oomkilladj; /* OOM kill score adjustment (bit shift). */ |
Paolo 'Blaisorblade' Giarrusso | 3677209 | 2005-05-05 16:16:12 -0700 | [diff] [blame] | 1058 | char comm[TASK_COMM_LEN]; /* executable name excluding path |
| 1059 | - access with [gs]et_task_comm (which lock |
| 1060 | it with task_lock()) |
| 1061 | - initialized normally by flush_old_exec */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1062 | /* file system info */ |
| 1063 | int link_count, total_link_count; |
Alexey Dobriyan | 3d5b6fc | 2006-09-29 01:59:40 -0700 | [diff] [blame] | 1064 | #ifdef CONFIG_SYSVIPC |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | /* ipc stuff */ |
| 1066 | struct sysv_sem sysvsem; |
Alexey Dobriyan | 3d5b6fc | 2006-09-29 01:59:40 -0700 | [diff] [blame] | 1067 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | /* CPU-specific state of this task */ |
| 1069 | struct thread_struct thread; |
| 1070 | /* filesystem information */ |
| 1071 | struct fs_struct *fs; |
| 1072 | /* open file information */ |
| 1073 | struct files_struct *files; |
Serge E. Hallyn | 1651e14 | 2006-10-02 02:18:08 -0700 | [diff] [blame] | 1074 | /* namespaces */ |
Serge E. Hallyn | ab51601 | 2006-10-02 02:18:06 -0700 | [diff] [blame] | 1075 | struct nsproxy *nsproxy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1076 | /* signal handlers */ |
| 1077 | struct signal_struct *signal; |
| 1078 | struct sighand_struct *sighand; |
| 1079 | |
| 1080 | sigset_t blocked, real_blocked; |
David Woodhouse | 150256d | 2006-01-18 17:43:57 -0800 | [diff] [blame] | 1081 | sigset_t saved_sigmask; /* To be restored with TIF_RESTORE_SIGMASK */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | struct sigpending pending; |
| 1083 | |
| 1084 | unsigned long sas_ss_sp; |
| 1085 | size_t sas_ss_size; |
| 1086 | int (*notifier)(void *priv); |
| 1087 | void *notifier_data; |
| 1088 | sigset_t *notifier_mask; |
| 1089 | |
| 1090 | void *security; |
| 1091 | struct audit_context *audit_context; |
| 1092 | seccomp_t seccomp; |
| 1093 | |
| 1094 | /* Thread group tracking */ |
| 1095 | u32 parent_exec_id; |
| 1096 | u32 self_exec_id; |
| 1097 | /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */ |
| 1098 | spinlock_t alloc_lock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1099 | |
Ingo Molnar | b29739f | 2006-06-27 02:54:51 -0700 | [diff] [blame] | 1100 | /* Protection of the PI data structures: */ |
| 1101 | spinlock_t pi_lock; |
| 1102 | |
Ingo Molnar | 23f78d4a | 2006-06-27 02:54:53 -0700 | [diff] [blame] | 1103 | #ifdef CONFIG_RT_MUTEXES |
| 1104 | /* PI waiters blocked on a rt_mutex held by this task */ |
| 1105 | struct plist_head pi_waiters; |
| 1106 | /* Deadlock detection and priority inheritance handling */ |
| 1107 | struct rt_mutex_waiter *pi_blocked_on; |
Ingo Molnar | 23f78d4a | 2006-06-27 02:54:53 -0700 | [diff] [blame] | 1108 | #endif |
| 1109 | |
Ingo Molnar | 408894e | 2006-01-09 15:59:20 -0800 | [diff] [blame] | 1110 | #ifdef CONFIG_DEBUG_MUTEXES |
| 1111 | /* mutex deadlock detection */ |
| 1112 | struct mutex_waiter *blocked_on; |
| 1113 | #endif |
Ingo Molnar | de30a2b | 2006-07-03 00:24:42 -0700 | [diff] [blame] | 1114 | #ifdef CONFIG_TRACE_IRQFLAGS |
| 1115 | unsigned int irq_events; |
| 1116 | int hardirqs_enabled; |
| 1117 | unsigned long hardirq_enable_ip; |
| 1118 | unsigned int hardirq_enable_event; |
| 1119 | unsigned long hardirq_disable_ip; |
| 1120 | unsigned int hardirq_disable_event; |
| 1121 | int softirqs_enabled; |
| 1122 | unsigned long softirq_disable_ip; |
| 1123 | unsigned int softirq_disable_event; |
| 1124 | unsigned long softirq_enable_ip; |
| 1125 | unsigned int softirq_enable_event; |
| 1126 | int hardirq_context; |
| 1127 | int softirq_context; |
| 1128 | #endif |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 1129 | #ifdef CONFIG_LOCKDEP |
| 1130 | # define MAX_LOCK_DEPTH 30UL |
| 1131 | u64 curr_chain_key; |
| 1132 | int lockdep_depth; |
| 1133 | struct held_lock held_locks[MAX_LOCK_DEPTH]; |
| 1134 | unsigned int lockdep_recursion; |
| 1135 | #endif |
Ingo Molnar | 408894e | 2006-01-09 15:59:20 -0800 | [diff] [blame] | 1136 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1137 | /* journalling filesystem info */ |
| 1138 | void *journal_info; |
| 1139 | |
Neil Brown | d89d879 | 2007-05-01 09:53:42 +0200 | [diff] [blame] | 1140 | /* stacked block device info */ |
| 1141 | struct bio *bio_list, **bio_tail; |
| 1142 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1143 | /* VM state */ |
| 1144 | struct reclaim_state *reclaim_state; |
| 1145 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1146 | struct backing_dev_info *backing_dev_info; |
| 1147 | |
| 1148 | struct io_context *io_context; |
| 1149 | |
| 1150 | unsigned long ptrace_message; |
| 1151 | siginfo_t *last_siginfo; /* For ptrace use. */ |
| 1152 | /* |
| 1153 | * current io wait handle: wait queue entry to use for io waits |
| 1154 | * If this thread is processing aio, this points at the waitqueue |
| 1155 | * inside the currently handled kiocb. It may be NULL (i.e. default |
| 1156 | * to a stack based synchronous wait) if its doing sync IO. |
| 1157 | */ |
| 1158 | wait_queue_t *io_wait; |
Alexey Dobriyan | 4b98d11 | 2007-02-10 01:46:45 -0800 | [diff] [blame] | 1159 | #ifdef CONFIG_TASK_XACCT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1160 | /* i/o counters(bytes read/written, #syscalls */ |
| 1161 | u64 rchar, wchar, syscr, syscw; |
Alexey Dobriyan | 4b98d11 | 2007-02-10 01:46:45 -0800 | [diff] [blame] | 1162 | #endif |
Andrew Morton | 7c3ab73 | 2006-12-10 02:19:19 -0800 | [diff] [blame] | 1163 | struct task_io_accounting ioac; |
Jay Lan | 8f0ab51 | 2006-09-30 23:28:59 -0700 | [diff] [blame] | 1164 | #if defined(CONFIG_TASK_XACCT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1165 | u64 acct_rss_mem1; /* accumulated rss usage */ |
| 1166 | u64 acct_vm_mem1; /* accumulated virtual memory usage */ |
Jay Lan | db5fed26 | 2006-09-30 23:29:00 -0700 | [diff] [blame] | 1167 | cputime_t acct_stimexpd;/* stime since last update */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1168 | #endif |
| 1169 | #ifdef CONFIG_NUMA |
| 1170 | struct mempolicy *mempolicy; |
| 1171 | short il_next; |
| 1172 | #endif |
| 1173 | #ifdef CONFIG_CPUSETS |
| 1174 | struct cpuset *cpuset; |
| 1175 | nodemask_t mems_allowed; |
| 1176 | int cpuset_mems_generation; |
Paul Jackson | 825a46a | 2006-03-24 03:16:03 -0800 | [diff] [blame] | 1177 | int cpuset_mem_spread_rotor; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1178 | #endif |
Ingo Molnar | 0771dfe | 2006-03-27 01:16:22 -0800 | [diff] [blame] | 1179 | struct robust_list_head __user *robust_list; |
Ingo Molnar | 34f192c | 2006-03-27 01:16:24 -0800 | [diff] [blame] | 1180 | #ifdef CONFIG_COMPAT |
| 1181 | struct compat_robust_list_head __user *compat_robust_list; |
| 1182 | #endif |
Ingo Molnar | c87e283 | 2006-06-27 02:54:58 -0700 | [diff] [blame] | 1183 | struct list_head pi_state_list; |
| 1184 | struct futex_pi_state *pi_state_cache; |
Ingo Molnar | 0771dfe | 2006-03-27 01:16:22 -0800 | [diff] [blame] | 1185 | |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 1186 | atomic_t fs_excl; /* holding fs exclusive resources */ |
Ingo Molnar | e56d090 | 2006-01-08 01:01:37 -0800 | [diff] [blame] | 1187 | struct rcu_head rcu; |
Jens Axboe | b92ce55 | 2006-04-11 13:52:07 +0200 | [diff] [blame] | 1188 | |
| 1189 | /* |
| 1190 | * cache last used pipe for splice |
| 1191 | */ |
| 1192 | struct pipe_inode_info *splice_pipe; |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 1193 | #ifdef CONFIG_TASK_DELAY_ACCT |
| 1194 | struct task_delay_info *delays; |
| 1195 | #endif |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1196 | #ifdef CONFIG_FAULT_INJECTION |
| 1197 | int make_it_fail; |
| 1198 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1199 | }; |
| 1200 | |
Ingo Molnar | e05606d | 2007-07-09 18:51:59 +0200 | [diff] [blame] | 1201 | /* |
| 1202 | * Priority of a process goes from 0..MAX_PRIO-1, valid RT |
| 1203 | * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH |
| 1204 | * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority |
| 1205 | * values are inverted: lower p->prio value means higher priority. |
| 1206 | * |
| 1207 | * The MAX_USER_RT_PRIO value allows the actual maximum |
| 1208 | * RT priority to be separate from the value exported to |
| 1209 | * user-space. This allows kernel threads to set their |
| 1210 | * priority to a value higher than any user task. Note: |
| 1211 | * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. |
| 1212 | */ |
| 1213 | |
| 1214 | #define MAX_USER_RT_PRIO 100 |
| 1215 | #define MAX_RT_PRIO MAX_USER_RT_PRIO |
| 1216 | |
| 1217 | #define MAX_PRIO (MAX_RT_PRIO + 40) |
| 1218 | #define DEFAULT_PRIO (MAX_RT_PRIO + 20) |
| 1219 | |
| 1220 | static inline int rt_prio(int prio) |
| 1221 | { |
| 1222 | if (unlikely(prio < MAX_RT_PRIO)) |
| 1223 | return 1; |
| 1224 | return 0; |
| 1225 | } |
| 1226 | |
| 1227 | static inline int rt_task(struct task_struct *p) |
| 1228 | { |
| 1229 | return rt_prio(p->prio); |
| 1230 | } |
| 1231 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1232 | static inline pid_t process_group(struct task_struct *tsk) |
| 1233 | { |
| 1234 | return tsk->signal->pgrp; |
| 1235 | } |
| 1236 | |
Cedric Le Goater | 1ec320a | 2006-12-08 02:37:55 -0800 | [diff] [blame] | 1237 | static inline pid_t signal_session(struct signal_struct *sig) |
| 1238 | { |
| 1239 | return sig->__session; |
| 1240 | } |
| 1241 | |
Cedric Le Goater | 937949d | 2006-12-08 02:37:54 -0800 | [diff] [blame] | 1242 | static inline pid_t process_session(struct task_struct *tsk) |
| 1243 | { |
Cedric Le Goater | 1ec320a | 2006-12-08 02:37:55 -0800 | [diff] [blame] | 1244 | return signal_session(tsk->signal); |
| 1245 | } |
| 1246 | |
| 1247 | static inline void set_signal_session(struct signal_struct *sig, pid_t session) |
| 1248 | { |
| 1249 | sig->__session = session; |
Cedric Le Goater | 937949d | 2006-12-08 02:37:54 -0800 | [diff] [blame] | 1250 | } |
| 1251 | |
Eric W. Biederman | 22c935f | 2006-10-02 02:17:09 -0700 | [diff] [blame] | 1252 | static inline struct pid *task_pid(struct task_struct *task) |
| 1253 | { |
| 1254 | return task->pids[PIDTYPE_PID].pid; |
| 1255 | } |
| 1256 | |
| 1257 | static inline struct pid *task_tgid(struct task_struct *task) |
| 1258 | { |
| 1259 | return task->group_leader->pids[PIDTYPE_PID].pid; |
| 1260 | } |
| 1261 | |
| 1262 | static inline struct pid *task_pgrp(struct task_struct *task) |
| 1263 | { |
| 1264 | return task->group_leader->pids[PIDTYPE_PGID].pid; |
| 1265 | } |
| 1266 | |
| 1267 | static inline struct pid *task_session(struct task_struct *task) |
| 1268 | { |
| 1269 | return task->group_leader->pids[PIDTYPE_SID].pid; |
| 1270 | } |
| 1271 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1272 | /** |
| 1273 | * pid_alive - check that a task structure is not stale |
| 1274 | * @p: Task structure to be checked. |
| 1275 | * |
| 1276 | * Test if a process is not yet dead (at most zombie state) |
| 1277 | * If pid_alive fails, then pointers within the task structure |
| 1278 | * can be stale and must not be dereferenced. |
| 1279 | */ |
| 1280 | static inline int pid_alive(struct task_struct *p) |
| 1281 | { |
Eric W. Biederman | 92476d7 | 2006-03-31 02:31:42 -0800 | [diff] [blame] | 1282 | return p->pids[PIDTYPE_PID].pid != NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1283 | } |
| 1284 | |
Sukadev Bhattiprolu | f400e19 | 2006-09-29 02:00:07 -0700 | [diff] [blame] | 1285 | /** |
Henne | 3260259 | 2006-10-06 00:44:01 -0700 | [diff] [blame] | 1286 | * is_init - check if a task structure is init |
| 1287 | * @tsk: Task structure to be checked. |
| 1288 | * |
| 1289 | * 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] | 1290 | */ |
| 1291 | static inline int is_init(struct task_struct *tsk) |
| 1292 | { |
| 1293 | return tsk->pid == 1; |
| 1294 | } |
| 1295 | |
Cedric Le Goater | 9ec5209 | 2006-10-02 02:19:00 -0700 | [diff] [blame] | 1296 | extern struct pid *cad_pid; |
| 1297 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1298 | extern void free_task(struct task_struct *tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1299 | #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) |
Ingo Molnar | e56d090 | 2006-01-08 01:01:37 -0800 | [diff] [blame] | 1300 | |
Andrew Morton | 158d9eb | 2006-03-31 02:31:34 -0800 | [diff] [blame] | 1301 | extern void __put_task_struct(struct task_struct *t); |
Ingo Molnar | e56d090 | 2006-01-08 01:01:37 -0800 | [diff] [blame] | 1302 | |
| 1303 | static inline void put_task_struct(struct task_struct *t) |
| 1304 | { |
| 1305 | if (atomic_dec_and_test(&t->usage)) |
Eric W. Biederman | 8c7904a | 2006-03-31 02:31:37 -0800 | [diff] [blame] | 1306 | __put_task_struct(t); |
Ingo Molnar | e56d090 | 2006-01-08 01:01:37 -0800 | [diff] [blame] | 1307 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1308 | |
| 1309 | /* |
| 1310 | * Per process flags |
| 1311 | */ |
| 1312 | #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */ |
| 1313 | /* Not implemented yet, only for 486*/ |
| 1314 | #define PF_STARTING 0x00000002 /* being created */ |
| 1315 | #define PF_EXITING 0x00000004 /* getting shut down */ |
Alexey Kuznetsov | 778e9a9 | 2007-06-08 13:47:00 -0700 | [diff] [blame] | 1316 | #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1317 | #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ |
| 1318 | #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ |
| 1319 | #define PF_DUMPCORE 0x00000200 /* dumped core */ |
| 1320 | #define PF_SIGNALED 0x00000400 /* killed by a signal */ |
| 1321 | #define PF_MEMALLOC 0x00000800 /* Allocating memory */ |
| 1322 | #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */ |
| 1323 | #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] | 1324 | #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ |
| 1325 | #define PF_FROZEN 0x00010000 /* frozen for system suspend */ |
| 1326 | #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ |
| 1327 | #define PF_KSWAPD 0x00040000 /* I am kswapd */ |
| 1328 | #define PF_SWAPOFF 0x00080000 /* I am in swapoff */ |
| 1329 | #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ |
Jens Axboe | b31dc66 | 2006-06-13 08:26:10 +0200 | [diff] [blame] | 1330 | #define PF_BORROWED_MM 0x00200000 /* I am a kthread doing use_mm */ |
| 1331 | #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ |
| 1332 | #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ |
| 1333 | #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */ |
| 1334 | #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */ |
Paul Jackson | c61afb1 | 2006-03-24 03:16:08 -0800 | [diff] [blame] | 1335 | #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */ |
Thomas Gleixner | 61a8712 | 2006-06-27 02:54:56 -0700 | [diff] [blame] | 1336 | #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] | 1337 | #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1338 | |
| 1339 | /* |
| 1340 | * Only the _current_ task can read/write to tsk->flags, but other |
| 1341 | * tasks can access tsk->flags in readonly mode for example |
| 1342 | * with tsk_used_math (like during threaded core dumping). |
| 1343 | * There is however an exception to this rule during ptrace |
| 1344 | * or during fork: the ptracer task is allowed to write to the |
| 1345 | * child->flags of its traced child (same goes for fork, the parent |
| 1346 | * can write to the child->flags), because we're guaranteed the |
| 1347 | * child is not running and in turn not changing child->flags |
| 1348 | * at the same time the parent does it. |
| 1349 | */ |
| 1350 | #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) |
| 1351 | #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) |
| 1352 | #define clear_used_math() clear_stopped_child_used_math(current) |
| 1353 | #define set_used_math() set_stopped_child_used_math(current) |
| 1354 | #define conditional_stopped_child_used_math(condition, child) \ |
| 1355 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) |
| 1356 | #define conditional_used_math(condition) \ |
| 1357 | conditional_stopped_child_used_math(condition, current) |
| 1358 | #define copy_to_stopped_child_used_math(child) \ |
| 1359 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) |
| 1360 | /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ |
| 1361 | #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) |
| 1362 | #define used_math() tsk_used_math(current) |
| 1363 | |
| 1364 | #ifdef CONFIG_SMP |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 1365 | extern int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | #else |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 1367 | static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1368 | { |
Paul Jackson | 4098f99 | 2005-10-30 15:03:21 -0800 | [diff] [blame] | 1369 | if (!cpu_isset(0, new_mask)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1370 | return -EINVAL; |
| 1371 | return 0; |
| 1372 | } |
| 1373 | #endif |
| 1374 | |
| 1375 | extern unsigned long long sched_clock(void); |
Ingo Molnar | e436d80 | 2007-07-19 21:28:35 +0200 | [diff] [blame] | 1376 | |
| 1377 | /* |
| 1378 | * For kernel-internal use: high-speed (but slightly incorrect) per-cpu |
| 1379 | * clock constructed from sched_clock(): |
| 1380 | */ |
| 1381 | extern unsigned long long cpu_clock(int cpu); |
| 1382 | |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 1383 | extern unsigned long long |
Ingo Molnar | 41b86e9 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 1384 | task_sched_runtime(struct task_struct *task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1385 | |
| 1386 | /* sched_exec is called by processes performing an exec */ |
| 1387 | #ifdef CONFIG_SMP |
| 1388 | extern void sched_exec(void); |
| 1389 | #else |
| 1390 | #define sched_exec() {} |
| 1391 | #endif |
| 1392 | |
Ingo Molnar | 2aa44d0 | 2007-08-23 15:18:02 +0200 | [diff] [blame] | 1393 | extern void sched_clock_idle_sleep_event(void); |
| 1394 | extern void sched_clock_idle_wakeup_event(u64 delta_ns); |
Ingo Molnar | bb29ab2 | 2007-07-09 18:51:59 +0200 | [diff] [blame] | 1395 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1396 | #ifdef CONFIG_HOTPLUG_CPU |
| 1397 | extern void idle_task_exit(void); |
| 1398 | #else |
| 1399 | static inline void idle_task_exit(void) {} |
| 1400 | #endif |
| 1401 | |
| 1402 | extern void sched_idle_next(void); |
Ingo Molnar | b29739f | 2006-06-27 02:54:51 -0700 | [diff] [blame] | 1403 | |
Peter Zijlstra | 2180508 | 2007-08-25 18:41:53 +0200 | [diff] [blame] | 1404 | extern unsigned int sysctl_sched_latency; |
Ingo Molnar | 172ac3d | 2007-08-25 18:41:53 +0200 | [diff] [blame] | 1405 | extern unsigned int sysctl_sched_min_granularity; |
Ingo Molnar | bf0f6f2 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 1406 | extern unsigned int sysctl_sched_wakeup_granularity; |
| 1407 | extern unsigned int sysctl_sched_batch_wakeup_granularity; |
| 1408 | extern unsigned int sysctl_sched_stat_granularity; |
| 1409 | extern unsigned int sysctl_sched_runtime_limit; |
Ingo Molnar | 1799e35 | 2007-09-19 23:34:46 +0200 | [diff] [blame] | 1410 | extern unsigned int sysctl_sched_compat_yield; |
Ingo Molnar | bf0f6f2 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 1411 | extern unsigned int sysctl_sched_child_runs_first; |
| 1412 | extern unsigned int sysctl_sched_features; |
| 1413 | |
Ingo Molnar | b29739f | 2006-06-27 02:54:51 -0700 | [diff] [blame] | 1414 | #ifdef CONFIG_RT_MUTEXES |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 1415 | extern int rt_mutex_getprio(struct task_struct *p); |
| 1416 | extern void rt_mutex_setprio(struct task_struct *p, int prio); |
| 1417 | extern void rt_mutex_adjust_pi(struct task_struct *p); |
Ingo Molnar | b29739f | 2006-06-27 02:54:51 -0700 | [diff] [blame] | 1418 | #else |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 1419 | static inline int rt_mutex_getprio(struct task_struct *p) |
Ingo Molnar | b29739f | 2006-06-27 02:54:51 -0700 | [diff] [blame] | 1420 | { |
| 1421 | return p->normal_prio; |
| 1422 | } |
Thomas Gleixner | 95e02ca | 2006-06-27 02:55:02 -0700 | [diff] [blame] | 1423 | # define rt_mutex_adjust_pi(p) do { } while (0) |
Ingo Molnar | b29739f | 2006-06-27 02:54:51 -0700 | [diff] [blame] | 1424 | #endif |
| 1425 | |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 1426 | extern void set_user_nice(struct task_struct *p, long nice); |
| 1427 | extern int task_prio(const struct task_struct *p); |
| 1428 | extern int task_nice(const struct task_struct *p); |
| 1429 | extern int can_nice(const struct task_struct *p, const int nice); |
| 1430 | extern int task_curr(const struct task_struct *p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1431 | extern int idle_cpu(int cpu); |
| 1432 | extern int sched_setscheduler(struct task_struct *, int, struct sched_param *); |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 1433 | extern struct task_struct *idle_task(int cpu); |
| 1434 | extern struct task_struct *curr_task(int cpu); |
| 1435 | extern void set_curr_task(int cpu, struct task_struct *p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1436 | |
| 1437 | void yield(void); |
| 1438 | |
| 1439 | /* |
| 1440 | * The default (Linux) execution domain. |
| 1441 | */ |
| 1442 | extern struct exec_domain default_exec_domain; |
| 1443 | |
| 1444 | union thread_union { |
| 1445 | struct thread_info thread_info; |
| 1446 | unsigned long stack[THREAD_SIZE/sizeof(long)]; |
| 1447 | }; |
| 1448 | |
| 1449 | #ifndef __HAVE_ARCH_KSTACK_END |
| 1450 | static inline int kstack_end(void *addr) |
| 1451 | { |
| 1452 | /* Reliable end of stack detection: |
| 1453 | * Some APM bios versions misalign the stack |
| 1454 | */ |
| 1455 | return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); |
| 1456 | } |
| 1457 | #endif |
| 1458 | |
| 1459 | extern union thread_union init_thread_union; |
| 1460 | extern struct task_struct init_task; |
| 1461 | |
| 1462 | extern struct mm_struct init_mm; |
| 1463 | |
| 1464 | #define find_task_by_pid(nr) find_task_by_pid_type(PIDTYPE_PID, nr) |
| 1465 | extern struct task_struct *find_task_by_pid_type(int type, int pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1466 | extern void __set_special_pids(pid_t session, pid_t pgrp); |
| 1467 | |
| 1468 | /* per-UID process charging. */ |
Cedric Le Goater | acce292 | 2007-07-15 23:40:59 -0700 | [diff] [blame] | 1469 | extern struct user_struct * alloc_uid(struct user_namespace *, uid_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1470 | static inline struct user_struct *get_uid(struct user_struct *u) |
| 1471 | { |
| 1472 | atomic_inc(&u->__count); |
| 1473 | return u; |
| 1474 | } |
| 1475 | extern void free_uid(struct user_struct *); |
| 1476 | extern void switch_uid(struct user_struct *); |
Pavel Emelyanov | 28f300d | 2007-09-18 22:46:45 -0700 | [diff] [blame] | 1477 | extern void release_uids(struct user_namespace *ns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1478 | |
| 1479 | #include <asm/current.h> |
| 1480 | |
Atsushi Nemoto | 3171a03 | 2006-09-29 02:00:32 -0700 | [diff] [blame] | 1481 | extern void do_timer(unsigned long ticks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1482 | |
| 1483 | extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state)); |
| 1484 | extern int FASTCALL(wake_up_process(struct task_struct * tsk)); |
| 1485 | extern void FASTCALL(wake_up_new_task(struct task_struct * tsk, |
| 1486 | unsigned long clone_flags)); |
| 1487 | #ifdef CONFIG_SMP |
| 1488 | extern void kick_process(struct task_struct *tsk); |
| 1489 | #else |
| 1490 | static inline void kick_process(struct task_struct *tsk) { } |
| 1491 | #endif |
Ingo Molnar | ad46c2c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 1492 | extern void sched_fork(struct task_struct *p, int clone_flags); |
| 1493 | extern void sched_dead(struct task_struct *p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1494 | |
| 1495 | extern int in_group_p(gid_t); |
| 1496 | extern int in_egroup_p(gid_t); |
| 1497 | |
| 1498 | extern void proc_caches_init(void); |
| 1499 | extern void flush_signals(struct task_struct *); |
Oleg Nesterov | 10ab825 | 2007-05-09 02:34:37 -0700 | [diff] [blame] | 1500 | extern void ignore_signals(struct task_struct *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1501 | extern void flush_signal_handlers(struct task_struct *, int force_default); |
| 1502 | extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); |
| 1503 | |
| 1504 | static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) |
| 1505 | { |
| 1506 | unsigned long flags; |
| 1507 | int ret; |
| 1508 | |
| 1509 | spin_lock_irqsave(&tsk->sighand->siglock, flags); |
| 1510 | ret = dequeue_signal(tsk, mask, info); |
| 1511 | spin_unlock_irqrestore(&tsk->sighand->siglock, flags); |
| 1512 | |
| 1513 | return ret; |
| 1514 | } |
| 1515 | |
| 1516 | extern void block_all_signals(int (*notifier)(void *priv), void *priv, |
| 1517 | sigset_t *mask); |
| 1518 | extern void unblock_all_signals(void); |
| 1519 | extern void release_task(struct task_struct * p); |
| 1520 | extern int send_sig_info(int, struct siginfo *, struct task_struct *); |
| 1521 | extern int send_group_sig_info(int, struct siginfo *, struct task_struct *); |
| 1522 | extern int force_sigsegv(int, struct task_struct *); |
| 1523 | extern int force_sig_info(int, struct siginfo *, struct task_struct *); |
Eric W. Biederman | c4b92fc | 2006-10-02 02:17:10 -0700 | [diff] [blame] | 1524 | extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); |
| 1525 | extern int kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); |
| 1526 | 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] | 1527 | 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] | 1528 | extern int kill_pgrp(struct pid *pid, int sig, int priv); |
| 1529 | extern int kill_pid(struct pid *pid, int sig, int priv); |
Matthew Wilcox | c3de4b3 | 2007-02-09 08:11:47 -0700 | [diff] [blame] | 1530 | extern int kill_proc_info(int, struct siginfo *, pid_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1531 | extern void do_notify_parent(struct task_struct *, int); |
| 1532 | extern void force_sig(int, struct task_struct *); |
| 1533 | extern void force_sig_specific(int, struct task_struct *); |
| 1534 | extern int send_sig(int, struct task_struct *, int); |
| 1535 | extern void zap_other_threads(struct task_struct *p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1536 | extern int kill_proc(pid_t, int, int); |
| 1537 | extern struct sigqueue *sigqueue_alloc(void); |
| 1538 | extern void sigqueue_free(struct sigqueue *); |
| 1539 | extern int send_sigqueue(int, struct sigqueue *, struct task_struct *); |
| 1540 | extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *); |
Oleg Nesterov | 9ac95f2 | 2006-02-09 22:41:50 +0300 | [diff] [blame] | 1541 | extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1542 | extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); |
| 1543 | |
Cedric Le Goater | 9ec5209 | 2006-10-02 02:19:00 -0700 | [diff] [blame] | 1544 | static inline int kill_cad_pid(int sig, int priv) |
| 1545 | { |
| 1546 | return kill_pid(cad_pid, sig, priv); |
| 1547 | } |
| 1548 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1549 | /* These can be the second arg to send_sig_info/send_group_sig_info. */ |
| 1550 | #define SEND_SIG_NOINFO ((struct siginfo *) 0) |
| 1551 | #define SEND_SIG_PRIV ((struct siginfo *) 1) |
| 1552 | #define SEND_SIG_FORCED ((struct siginfo *) 2) |
| 1553 | |
Oleg Nesterov | 621d312 | 2005-10-30 15:03:45 -0800 | [diff] [blame] | 1554 | static inline int is_si_special(const struct siginfo *info) |
| 1555 | { |
| 1556 | return info <= SEND_SIG_FORCED; |
| 1557 | } |
| 1558 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1559 | /* True if we are on the alternate signal stack. */ |
| 1560 | |
| 1561 | static inline int on_sig_stack(unsigned long sp) |
| 1562 | { |
| 1563 | return (sp - current->sas_ss_sp < current->sas_ss_size); |
| 1564 | } |
| 1565 | |
| 1566 | static inline int sas_ss_flags(unsigned long sp) |
| 1567 | { |
| 1568 | return (current->sas_ss_size == 0 ? SS_DISABLE |
| 1569 | : on_sig_stack(sp) ? SS_ONSTACK : 0); |
| 1570 | } |
| 1571 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1572 | /* |
| 1573 | * Routines for handling mm_structs |
| 1574 | */ |
| 1575 | extern struct mm_struct * mm_alloc(void); |
| 1576 | |
| 1577 | /* mmdrop drops the mm and the page tables */ |
| 1578 | extern void FASTCALL(__mmdrop(struct mm_struct *)); |
| 1579 | static inline void mmdrop(struct mm_struct * mm) |
| 1580 | { |
Ingo Molnar | 6fb43d7 | 2007-07-09 18:52:01 +0200 | [diff] [blame] | 1581 | if (unlikely(atomic_dec_and_test(&mm->mm_count))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1582 | __mmdrop(mm); |
| 1583 | } |
| 1584 | |
| 1585 | /* mmput gets rid of the mappings and all user-space */ |
| 1586 | extern void mmput(struct mm_struct *); |
| 1587 | /* Grab a reference to a task's mm, if it is not already going away */ |
| 1588 | extern struct mm_struct *get_task_mm(struct task_struct *task); |
| 1589 | /* Remove the current tasks stale references to the old mm_struct */ |
| 1590 | extern void mm_release(struct task_struct *, struct mm_struct *); |
| 1591 | |
| 1592 | extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *); |
| 1593 | extern void flush_thread(void); |
| 1594 | extern void exit_thread(void); |
| 1595 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1596 | extern void exit_files(struct task_struct *); |
Oleg Nesterov | 6b3934e | 2006-03-28 16:11:16 -0800 | [diff] [blame] | 1597 | extern void __cleanup_signal(struct signal_struct *); |
Oleg Nesterov | a7e5328 | 2006-03-28 16:11:27 -0800 | [diff] [blame] | 1598 | extern void __cleanup_sighand(struct sighand_struct *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1599 | extern void exit_itimers(struct signal_struct *); |
| 1600 | |
| 1601 | extern NORET_TYPE void do_group_exit(int); |
| 1602 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1603 | extern void daemonize(const char *, ...); |
| 1604 | extern int allow_signal(int); |
| 1605 | extern int disallow_signal(int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1606 | |
| 1607 | extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *); |
| 1608 | 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] | 1609 | struct task_struct *fork_idle(int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1610 | |
| 1611 | extern void set_task_comm(struct task_struct *tsk, char *from); |
| 1612 | extern void get_task_comm(char *to, struct task_struct *tsk); |
| 1613 | |
| 1614 | #ifdef CONFIG_SMP |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 1615 | extern void wait_task_inactive(struct task_struct * p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1616 | #else |
| 1617 | #define wait_task_inactive(p) do { } while (0) |
| 1618 | #endif |
| 1619 | |
| 1620 | #define remove_parent(p) list_del_init(&(p)->sibling) |
Oleg Nesterov | 8fafabd | 2006-03-28 16:11:05 -0800 | [diff] [blame] | 1621 | #define add_parent(p) list_add_tail(&(p)->sibling,&(p)->parent->children) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1622 | |
Eric W. Biederman | 5e85d4a | 2006-04-18 22:20:16 -0700 | [diff] [blame] | 1623 | #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] | 1624 | |
| 1625 | #define for_each_process(p) \ |
| 1626 | for (p = &init_task ; (p = next_task(p)) != &init_task ; ) |
| 1627 | |
| 1628 | /* |
| 1629 | * Careful: do_each_thread/while_each_thread is a double loop so |
| 1630 | * 'break' will not work as expected - use goto instead. |
| 1631 | */ |
| 1632 | #define do_each_thread(g, t) \ |
| 1633 | for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do |
| 1634 | |
| 1635 | #define while_each_thread(g, t) \ |
| 1636 | while ((t = next_thread(t)) != g) |
| 1637 | |
Eric W. Biederman | de12a78 | 2006-04-10 17:16:49 -0600 | [diff] [blame] | 1638 | /* de_thread depends on thread_group_leader not being a pid based check */ |
| 1639 | #define thread_group_leader(p) (p == p->group_leader) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1640 | |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 1641 | /* Do to the insanities of de_thread it is possible for a process |
| 1642 | * to have the pid of the thread group leader without actually being |
| 1643 | * the thread group leader. For iteration through the pids in proc |
| 1644 | * all we care about is that we have a task with the appropriate |
| 1645 | * pid, we don't actually care if we have the right task. |
| 1646 | */ |
| 1647 | static inline int has_group_leader_pid(struct task_struct *p) |
| 1648 | { |
| 1649 | return p->pid == p->tgid; |
| 1650 | } |
| 1651 | |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 1652 | static inline struct task_struct *next_thread(const struct task_struct *p) |
Oleg Nesterov | 47e6532 | 2006-03-28 16:11:25 -0800 | [diff] [blame] | 1653 | { |
| 1654 | return list_entry(rcu_dereference(p->thread_group.next), |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 1655 | struct task_struct, thread_group); |
Oleg Nesterov | 47e6532 | 2006-03-28 16:11:25 -0800 | [diff] [blame] | 1656 | } |
| 1657 | |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 1658 | static inline int thread_group_empty(struct task_struct *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1659 | { |
Oleg Nesterov | 47e6532 | 2006-03-28 16:11:25 -0800 | [diff] [blame] | 1660 | return list_empty(&p->thread_group); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1661 | } |
| 1662 | |
| 1663 | #define delay_group_leader(p) \ |
| 1664 | (thread_group_leader(p) && !thread_group_empty(p)) |
| 1665 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1666 | /* |
Eric W. Biederman | 260ea10 | 2006-06-23 02:05:18 -0700 | [diff] [blame] | 1667 | * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 1668 | * subscriptions and synchronises with wait4(). Also used in procfs. Also |
Paul Jackson | 053199e | 2005-10-30 15:02:30 -0800 | [diff] [blame] | 1669 | * pins the final release of task.io_context. Also protects ->cpuset. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1670 | * |
| 1671 | * Nests both inside and outside of read_lock(&tasklist_lock). |
| 1672 | * It must not be nested with write_lock_irq(&tasklist_lock), |
| 1673 | * neither inside nor outside. |
| 1674 | */ |
| 1675 | static inline void task_lock(struct task_struct *p) |
| 1676 | { |
| 1677 | spin_lock(&p->alloc_lock); |
| 1678 | } |
| 1679 | |
| 1680 | static inline void task_unlock(struct task_struct *p) |
| 1681 | { |
| 1682 | spin_unlock(&p->alloc_lock); |
| 1683 | } |
| 1684 | |
Oleg Nesterov | f63ee72 | 2006-03-28 16:11:13 -0800 | [diff] [blame] | 1685 | extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk, |
| 1686 | unsigned long *flags); |
| 1687 | |
| 1688 | static inline void unlock_task_sighand(struct task_struct *tsk, |
| 1689 | unsigned long *flags) |
| 1690 | { |
| 1691 | spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); |
| 1692 | } |
| 1693 | |
Al Viro | f037360 | 2005-11-13 16:06:57 -0800 | [diff] [blame] | 1694 | #ifndef __HAVE_THREAD_FUNCTIONS |
| 1695 | |
Roman Zippel | f7e4217 | 2007-05-09 02:35:17 -0700 | [diff] [blame] | 1696 | #define task_thread_info(task) ((struct thread_info *)(task)->stack) |
| 1697 | #define task_stack_page(task) ((task)->stack) |
Al Viro | a1261f5 | 2005-11-13 16:06:55 -0800 | [diff] [blame] | 1698 | |
Al Viro | 10ebffd | 2005-11-13 16:06:56 -0800 | [diff] [blame] | 1699 | static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) |
| 1700 | { |
| 1701 | *task_thread_info(p) = *task_thread_info(org); |
| 1702 | task_thread_info(p)->task = p; |
| 1703 | } |
| 1704 | |
| 1705 | static inline unsigned long *end_of_stack(struct task_struct *p) |
| 1706 | { |
Roman Zippel | f7e4217 | 2007-05-09 02:35:17 -0700 | [diff] [blame] | 1707 | return (unsigned long *)(task_thread_info(p) + 1); |
Al Viro | 10ebffd | 2005-11-13 16:06:56 -0800 | [diff] [blame] | 1708 | } |
| 1709 | |
Al Viro | f037360 | 2005-11-13 16:06:57 -0800 | [diff] [blame] | 1710 | #endif |
| 1711 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1712 | /* set thread flags in other task's structures |
| 1713 | * - see asm/thread_info.h for TIF_xxxx flags available |
| 1714 | */ |
| 1715 | static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) |
| 1716 | { |
Al Viro | a1261f5 | 2005-11-13 16:06:55 -0800 | [diff] [blame] | 1717 | set_ti_thread_flag(task_thread_info(tsk), flag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1718 | } |
| 1719 | |
| 1720 | static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) |
| 1721 | { |
Al Viro | a1261f5 | 2005-11-13 16:06:55 -0800 | [diff] [blame] | 1722 | clear_ti_thread_flag(task_thread_info(tsk), flag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1723 | } |
| 1724 | |
| 1725 | static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) |
| 1726 | { |
Al Viro | a1261f5 | 2005-11-13 16:06:55 -0800 | [diff] [blame] | 1727 | return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1728 | } |
| 1729 | |
| 1730 | static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) |
| 1731 | { |
Al Viro | a1261f5 | 2005-11-13 16:06:55 -0800 | [diff] [blame] | 1732 | return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1733 | } |
| 1734 | |
| 1735 | static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) |
| 1736 | { |
Al Viro | a1261f5 | 2005-11-13 16:06:55 -0800 | [diff] [blame] | 1737 | return test_ti_thread_flag(task_thread_info(tsk), flag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1738 | } |
| 1739 | |
| 1740 | static inline void set_tsk_need_resched(struct task_struct *tsk) |
| 1741 | { |
| 1742 | set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); |
| 1743 | } |
| 1744 | |
| 1745 | static inline void clear_tsk_need_resched(struct task_struct *tsk) |
| 1746 | { |
| 1747 | clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); |
| 1748 | } |
| 1749 | |
| 1750 | static inline int signal_pending(struct task_struct *p) |
| 1751 | { |
| 1752 | return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); |
| 1753 | } |
| 1754 | |
| 1755 | static inline int need_resched(void) |
| 1756 | { |
| 1757 | return unlikely(test_thread_flag(TIF_NEED_RESCHED)); |
| 1758 | } |
| 1759 | |
| 1760 | /* |
| 1761 | * cond_resched() and cond_resched_lock(): latency reduction via |
| 1762 | * explicit rescheduling in places that are safe. The return |
| 1763 | * value indicates whether a reschedule was done in fact. |
| 1764 | * cond_resched_lock() will drop the spinlock before scheduling, |
| 1765 | * cond_resched_softirq() will enable bhs before scheduling. |
| 1766 | */ |
| 1767 | extern int cond_resched(void); |
| 1768 | extern int cond_resched_lock(spinlock_t * lock); |
| 1769 | extern int cond_resched_softirq(void); |
| 1770 | |
| 1771 | /* |
| 1772 | * Does a critical section need to be broken due to another |
| 1773 | * task waiting?: |
| 1774 | */ |
| 1775 | #if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP) |
| 1776 | # define need_lockbreak(lock) ((lock)->break_lock) |
| 1777 | #else |
| 1778 | # define need_lockbreak(lock) 0 |
| 1779 | #endif |
| 1780 | |
| 1781 | /* |
| 1782 | * Does a critical section need to be broken due to another |
| 1783 | * task waiting or preemption being signalled: |
| 1784 | */ |
| 1785 | static inline int lock_need_resched(spinlock_t *lock) |
| 1786 | { |
| 1787 | if (need_lockbreak(lock) || need_resched()) |
| 1788 | return 1; |
| 1789 | return 0; |
| 1790 | } |
| 1791 | |
Roland McGrath | 7bb44ad | 2007-05-23 13:57:44 -0700 | [diff] [blame] | 1792 | /* |
| 1793 | * Reevaluate whether the task has signals pending delivery. |
| 1794 | * Wake the task if so. |
| 1795 | * This is required every time the blocked sigset_t changes. |
| 1796 | * callers must hold sighand->siglock. |
| 1797 | */ |
| 1798 | extern void recalc_sigpending_and_wake(struct task_struct *t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1799 | extern void recalc_sigpending(void); |
| 1800 | |
| 1801 | extern void signal_wake_up(struct task_struct *t, int resume_stopped); |
| 1802 | |
| 1803 | /* |
| 1804 | * Wrappers for p->thread_info->cpu access. No-op on UP. |
| 1805 | */ |
| 1806 | #ifdef CONFIG_SMP |
| 1807 | |
| 1808 | static inline unsigned int task_cpu(const struct task_struct *p) |
| 1809 | { |
Al Viro | a1261f5 | 2005-11-13 16:06:55 -0800 | [diff] [blame] | 1810 | return task_thread_info(p)->cpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1811 | } |
| 1812 | |
Ingo Molnar | c65cc87 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 1813 | extern void set_task_cpu(struct task_struct *p, unsigned int cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1814 | |
| 1815 | #else |
| 1816 | |
| 1817 | static inline unsigned int task_cpu(const struct task_struct *p) |
| 1818 | { |
| 1819 | return 0; |
| 1820 | } |
| 1821 | |
| 1822 | static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) |
| 1823 | { |
| 1824 | } |
| 1825 | |
| 1826 | #endif /* CONFIG_SMP */ |
| 1827 | |
| 1828 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT |
| 1829 | extern void arch_pick_mmap_layout(struct mm_struct *mm); |
| 1830 | #else |
| 1831 | static inline void arch_pick_mmap_layout(struct mm_struct *mm) |
| 1832 | { |
| 1833 | mm->mmap_base = TASK_UNMAPPED_BASE; |
| 1834 | mm->get_unmapped_area = arch_get_unmapped_area; |
| 1835 | mm->unmap_area = arch_unmap_area; |
| 1836 | } |
| 1837 | #endif |
| 1838 | |
| 1839 | extern long sched_setaffinity(pid_t pid, cpumask_t new_mask); |
| 1840 | extern long sched_getaffinity(pid_t pid, cpumask_t *mask); |
| 1841 | |
Siddha, Suresh B | 5c45bf2 | 2006-06-27 02:54:42 -0700 | [diff] [blame] | 1842 | extern int sched_mc_power_savings, sched_smt_power_savings; |
Siddha, Suresh B | 5c45bf2 | 2006-06-27 02:54:42 -0700 | [diff] [blame] | 1843 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1844 | extern void normalize_rt_tasks(void); |
| 1845 | |
Alexey Dobriyan | 4b98d11 | 2007-02-10 01:46:45 -0800 | [diff] [blame] | 1846 | #ifdef CONFIG_TASK_XACCT |
| 1847 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) |
| 1848 | { |
| 1849 | tsk->rchar += amt; |
| 1850 | } |
| 1851 | |
| 1852 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) |
| 1853 | { |
| 1854 | tsk->wchar += amt; |
| 1855 | } |
| 1856 | |
| 1857 | static inline void inc_syscr(struct task_struct *tsk) |
| 1858 | { |
| 1859 | tsk->syscr++; |
| 1860 | } |
| 1861 | |
| 1862 | static inline void inc_syscw(struct task_struct *tsk) |
| 1863 | { |
| 1864 | tsk->syscw++; |
| 1865 | } |
| 1866 | #else |
| 1867 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) |
| 1868 | { |
| 1869 | } |
| 1870 | |
| 1871 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) |
| 1872 | { |
| 1873 | } |
| 1874 | |
| 1875 | static inline void inc_syscr(struct task_struct *tsk) |
| 1876 | { |
| 1877 | } |
| 1878 | |
| 1879 | static inline void inc_syscw(struct task_struct *tsk) |
| 1880 | { |
| 1881 | } |
| 1882 | #endif |
| 1883 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1884 | #endif /* __KERNEL__ */ |
| 1885 | |
| 1886 | #endif |