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Commit | Line | Data |
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1da177e4 LT |
1 | #ifndef _LINUX_SCHED_H |
2 | #define _LINUX_SCHED_H | |
3 | ||
b7b3c76a DW |
4 | /* |
5 | * cloning flags: | |
6 | */ | |
7 | #define CSIGNAL 0x000000ff /* signal mask to be sent at exit */ | |
8 | #define CLONE_VM 0x00000100 /* set if VM shared between processes */ | |
9 | #define CLONE_FS 0x00000200 /* set if fs info shared between processes */ | |
10 | #define CLONE_FILES 0x00000400 /* set if open files shared between processes */ | |
11 | #define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */ | |
12 | #define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */ | |
13 | #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */ | |
14 | #define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */ | |
15 | #define CLONE_THREAD 0x00010000 /* Same thread group? */ | |
16 | #define CLONE_NEWNS 0x00020000 /* New namespace group? */ | |
17 | #define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */ | |
18 | #define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */ | |
19 | #define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */ | |
20 | #define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */ | |
21 | #define CLONE_DETACHED 0x00400000 /* Unused, ignored */ | |
22 | #define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */ | |
23 | #define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */ | |
24 | #define CLONE_STOPPED 0x02000000 /* Start in stopped state */ | |
071df104 | 25 | #define CLONE_NEWUTS 0x04000000 /* New utsname group? */ |
25b21cb2 | 26 | #define CLONE_NEWIPC 0x08000000 /* New ipcs */ |
77ec739d | 27 | #define CLONE_NEWUSER 0x10000000 /* New user namespace */ |
30e49c26 | 28 | #define CLONE_NEWPID 0x20000000 /* New pid namespace */ |
169e3674 | 29 | #define CLONE_NEWNET 0x40000000 /* New network namespace */ |
b7b3c76a DW |
30 | |
31 | /* | |
32 | * Scheduling policies | |
33 | */ | |
34 | #define SCHED_NORMAL 0 | |
35 | #define SCHED_FIFO 1 | |
36 | #define SCHED_RR 2 | |
37 | #define SCHED_BATCH 3 | |
0e6aca43 IM |
38 | /* SCHED_ISO: reserved but not implemented yet */ |
39 | #define SCHED_IDLE 5 | |
b7b3c76a | 40 | |
a3b6714e | 41 | #ifdef __KERNEL__ |
b7b3c76a DW |
42 | |
43 | struct sched_param { | |
44 | int sched_priority; | |
45 | }; | |
46 | ||
1da177e4 LT |
47 | #include <asm/param.h> /* for HZ */ |
48 | ||
1da177e4 LT |
49 | #include <linux/capability.h> |
50 | #include <linux/threads.h> | |
51 | #include <linux/kernel.h> | |
52 | #include <linux/types.h> | |
53 | #include <linux/timex.h> | |
54 | #include <linux/jiffies.h> | |
55 | #include <linux/rbtree.h> | |
56 | #include <linux/thread_info.h> | |
57 | #include <linux/cpumask.h> | |
58 | #include <linux/errno.h> | |
59 | #include <linux/nodemask.h> | |
c92ff1bd | 60 | #include <linux/mm_types.h> |
1da177e4 LT |
61 | |
62 | #include <asm/system.h> | |
63 | #include <asm/semaphore.h> | |
64 | #include <asm/page.h> | |
65 | #include <asm/ptrace.h> | |
1da177e4 LT |
66 | #include <asm/cputime.h> |
67 | ||
68 | #include <linux/smp.h> | |
69 | #include <linux/sem.h> | |
70 | #include <linux/signal.h> | |
71 | #include <linux/securebits.h> | |
72 | #include <linux/fs_struct.h> | |
73 | #include <linux/compiler.h> | |
74 | #include <linux/completion.h> | |
75 | #include <linux/pid.h> | |
76 | #include <linux/percpu.h> | |
77 | #include <linux/topology.h> | |
3e26c149 | 78 | #include <linux/proportions.h> |
1da177e4 | 79 | #include <linux/seccomp.h> |
e56d0903 | 80 | #include <linux/rcupdate.h> |
0771dfef | 81 | #include <linux/futex.h> |
23f78d4a | 82 | #include <linux/rtmutex.h> |
1da177e4 | 83 | |
a3b6714e DW |
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> | |
7c3ab738 | 89 | #include <linux/task_io_accounting.h> |
5cb350ba | 90 | #include <linux/kobject.h> |
a3b6714e DW |
91 | |
92 | #include <asm/processor.h> | |
36d57ac4 | 93 | |
1da177e4 | 94 | struct exec_domain; |
c87e2837 | 95 | struct futex_pi_state; |
d89d8796 | 96 | struct bio; |
1da177e4 | 97 | |
1da177e4 LT |
98 | /* |
99 | * List of flags we want to share for kernel threads, | |
100 | * if only because they are not used by them anyway. | |
101 | */ | |
102 | #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND) | |
103 | ||
104 | /* | |
105 | * These are the constant used to fake the fixed-point load-average | |
106 | * counting. Some notes: | |
107 | * - 11 bit fractions expand to 22 bits by the multiplies: this gives | |
108 | * a load-average precision of 10 bits integer + 11 bits fractional | |
109 | * - if you want to count load-averages more often, you need more | |
110 | * precision, or rounding will get you. With 2-second counting freq, | |
111 | * the EXP_n values would be 1981, 2034 and 2043 if still using only | |
112 | * 11 bit fractions. | |
113 | */ | |
114 | extern unsigned long avenrun[]; /* Load averages */ | |
115 | ||
116 | #define FSHIFT 11 /* nr of bits of precision */ | |
117 | #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ | |
0c2043ab | 118 | #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */ |
1da177e4 LT |
119 | #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ |
120 | #define EXP_5 2014 /* 1/exp(5sec/5min) */ | |
121 | #define EXP_15 2037 /* 1/exp(5sec/15min) */ | |
122 | ||
123 | #define CALC_LOAD(load,exp,n) \ | |
124 | load *= exp; \ | |
125 | load += n*(FIXED_1-exp); \ | |
126 | load >>= FSHIFT; | |
127 | ||
128 | extern unsigned long total_forks; | |
129 | extern int nr_threads; | |
1da177e4 LT |
130 | DECLARE_PER_CPU(unsigned long, process_counts); |
131 | extern int nr_processes(void); | |
132 | extern unsigned long nr_running(void); | |
133 | extern unsigned long nr_uninterruptible(void); | |
db1b1fef | 134 | extern unsigned long nr_active(void); |
1da177e4 | 135 | extern unsigned long nr_iowait(void); |
2dd73a4f | 136 | extern unsigned long weighted_cpuload(const int cpu); |
1da177e4 | 137 | |
43ae34cb IM |
138 | struct seq_file; |
139 | struct cfs_rq; | |
4cf86d77 | 140 | struct task_group; |
43ae34cb IM |
141 | #ifdef CONFIG_SCHED_DEBUG |
142 | extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m); | |
143 | extern void proc_sched_set_task(struct task_struct *p); | |
144 | extern void | |
5cef9eca | 145 | print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq); |
43ae34cb IM |
146 | #else |
147 | static inline void | |
148 | proc_sched_show_task(struct task_struct *p, struct seq_file *m) | |
149 | { | |
150 | } | |
151 | static inline void proc_sched_set_task(struct task_struct *p) | |
152 | { | |
153 | } | |
154 | static inline void | |
5cef9eca | 155 | print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) |
43ae34cb IM |
156 | { |
157 | } | |
158 | #endif | |
1da177e4 | 159 | |
4a8342d2 LT |
160 | /* |
161 | * Task state bitmask. NOTE! These bits are also | |
162 | * encoded in fs/proc/array.c: get_task_state(). | |
163 | * | |
164 | * We have two separate sets of flags: task->state | |
165 | * is about runnability, while task->exit_state are | |
166 | * about the task exiting. Confusing, but this way | |
167 | * modifying one set can't modify the other one by | |
168 | * mistake. | |
169 | */ | |
1da177e4 LT |
170 | #define TASK_RUNNING 0 |
171 | #define TASK_INTERRUPTIBLE 1 | |
172 | #define TASK_UNINTERRUPTIBLE 2 | |
4a8342d2 LT |
173 | #define TASK_STOPPED 4 |
174 | #define TASK_TRACED 8 | |
175 | /* in tsk->exit_state */ | |
176 | #define EXIT_ZOMBIE 16 | |
177 | #define EXIT_DEAD 32 | |
178 | /* in tsk->state again */ | |
af927232 | 179 | #define TASK_DEAD 64 |
1da177e4 LT |
180 | |
181 | #define __set_task_state(tsk, state_value) \ | |
182 | do { (tsk)->state = (state_value); } while (0) | |
183 | #define set_task_state(tsk, state_value) \ | |
184 | set_mb((tsk)->state, (state_value)) | |
185 | ||
498d0c57 AM |
186 | /* |
187 | * set_current_state() includes a barrier so that the write of current->state | |
188 | * is correctly serialised wrt the caller's subsequent test of whether to | |
189 | * actually sleep: | |
190 | * | |
191 | * set_current_state(TASK_UNINTERRUPTIBLE); | |
192 | * if (do_i_need_to_sleep()) | |
193 | * schedule(); | |
194 | * | |
195 | * If the caller does not need such serialisation then use __set_current_state() | |
196 | */ | |
1da177e4 LT |
197 | #define __set_current_state(state_value) \ |
198 | do { current->state = (state_value); } while (0) | |
199 | #define set_current_state(state_value) \ | |
200 | set_mb(current->state, (state_value)) | |
201 | ||
202 | /* Task command name length */ | |
203 | #define TASK_COMM_LEN 16 | |
204 | ||
1da177e4 LT |
205 | #include <linux/spinlock.h> |
206 | ||
207 | /* | |
208 | * This serializes "schedule()" and also protects | |
209 | * the run-queue from deletions/modifications (but | |
210 | * _adding_ to the beginning of the run-queue has | |
211 | * a separate lock). | |
212 | */ | |
213 | extern rwlock_t tasklist_lock; | |
214 | extern spinlock_t mmlist_lock; | |
215 | ||
36c8b586 | 216 | struct task_struct; |
1da177e4 LT |
217 | |
218 | extern void sched_init(void); | |
219 | extern void sched_init_smp(void); | |
36c8b586 | 220 | extern void init_idle(struct task_struct *idle, int cpu); |
1df21055 | 221 | extern void init_idle_bootup_task(struct task_struct *idle); |
1da177e4 LT |
222 | |
223 | extern cpumask_t nohz_cpu_mask; | |
46cb4b7c SS |
224 | #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ) |
225 | extern int select_nohz_load_balancer(int cpu); | |
226 | #else | |
227 | static inline int select_nohz_load_balancer(int cpu) | |
228 | { | |
229 | return 0; | |
230 | } | |
231 | #endif | |
1da177e4 | 232 | |
e59e2ae2 | 233 | /* |
39bc89fd | 234 | * Only dump TASK_* tasks. (0 for all tasks) |
e59e2ae2 IM |
235 | */ |
236 | extern void show_state_filter(unsigned long state_filter); | |
237 | ||
238 | static inline void show_state(void) | |
239 | { | |
39bc89fd | 240 | show_state_filter(0); |
e59e2ae2 IM |
241 | } |
242 | ||
1da177e4 LT |
243 | extern void show_regs(struct pt_regs *); |
244 | ||
245 | /* | |
246 | * TASK is a pointer to the task whose backtrace we want to see (or NULL for current | |
247 | * task), SP is the stack pointer of the first frame that should be shown in the back | |
248 | * trace (or NULL if the entire call-chain of the task should be shown). | |
249 | */ | |
250 | extern void show_stack(struct task_struct *task, unsigned long *sp); | |
251 | ||
252 | void io_schedule(void); | |
253 | long io_schedule_timeout(long timeout); | |
254 | ||
255 | extern void cpu_init (void); | |
256 | extern void trap_init(void); | |
fa13a5a1 | 257 | extern void account_process_tick(struct task_struct *task, int user); |
1da177e4 LT |
258 | extern void update_process_times(int user); |
259 | extern void scheduler_tick(void); | |
8f4d37ec | 260 | extern void hrtick_resched(void); |
1da177e4 | 261 | |
82a1fcb9 IM |
262 | extern void sched_show_task(struct task_struct *p); |
263 | ||
8446f1d3 | 264 | #ifdef CONFIG_DETECT_SOFTLOCKUP |
6687a97d | 265 | extern void softlockup_tick(void); |
8446f1d3 IM |
266 | extern void spawn_softlockup_task(void); |
267 | extern void touch_softlockup_watchdog(void); | |
04c9167f | 268 | extern void touch_all_softlockup_watchdogs(void); |
c4f3b63f | 269 | extern int softlockup_thresh; |
82a1fcb9 IM |
270 | extern unsigned long sysctl_hung_task_check_count; |
271 | extern unsigned long sysctl_hung_task_timeout_secs; | |
272 | extern long sysctl_hung_task_warnings; | |
8446f1d3 | 273 | #else |
6687a97d | 274 | static inline void softlockup_tick(void) |
8446f1d3 IM |
275 | { |
276 | } | |
277 | static inline void spawn_softlockup_task(void) | |
278 | { | |
279 | } | |
280 | static inline void touch_softlockup_watchdog(void) | |
281 | { | |
282 | } | |
04c9167f JF |
283 | static inline void touch_all_softlockup_watchdogs(void) |
284 | { | |
285 | } | |
8446f1d3 IM |
286 | #endif |
287 | ||
288 | ||
1da177e4 LT |
289 | /* Attach to any functions which should be ignored in wchan output. */ |
290 | #define __sched __attribute__((__section__(".sched.text"))) | |
deaf2227 IM |
291 | |
292 | /* Linker adds these: start and end of __sched functions */ | |
293 | extern char __sched_text_start[], __sched_text_end[]; | |
294 | ||
1da177e4 LT |
295 | /* Is this address in the __sched functions? */ |
296 | extern int in_sched_functions(unsigned long addr); | |
297 | ||
298 | #define MAX_SCHEDULE_TIMEOUT LONG_MAX | |
299 | extern signed long FASTCALL(schedule_timeout(signed long timeout)); | |
64ed93a2 NA |
300 | extern signed long schedule_timeout_interruptible(signed long timeout); |
301 | extern signed long schedule_timeout_uninterruptible(signed long timeout); | |
1da177e4 LT |
302 | asmlinkage void schedule(void); |
303 | ||
ab516013 | 304 | struct nsproxy; |
acce292c | 305 | struct user_namespace; |
1da177e4 LT |
306 | |
307 | /* Maximum number of active map areas.. This is a random (large) number */ | |
308 | #define DEFAULT_MAX_MAP_COUNT 65536 | |
309 | ||
310 | extern int sysctl_max_map_count; | |
311 | ||
312 | #include <linux/aio.h> | |
313 | ||
314 | extern unsigned long | |
315 | arch_get_unmapped_area(struct file *, unsigned long, unsigned long, | |
316 | unsigned long, unsigned long); | |
317 | extern unsigned long | |
318 | arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, | |
319 | unsigned long len, unsigned long pgoff, | |
320 | unsigned long flags); | |
1363c3cd WW |
321 | extern void arch_unmap_area(struct mm_struct *, unsigned long); |
322 | extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long); | |
1da177e4 | 323 | |
f412ac08 HD |
324 | #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS |
325 | /* | |
326 | * The mm counters are not protected by its page_table_lock, | |
327 | * so must be incremented atomically. | |
328 | */ | |
d3cb4871 CL |
329 | #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value) |
330 | #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member)) | |
331 | #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member) | |
332 | #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member) | |
333 | #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member) | |
f412ac08 HD |
334 | |
335 | #else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */ | |
336 | /* | |
337 | * The mm counters are protected by its page_table_lock, | |
338 | * so can be incremented directly. | |
339 | */ | |
1da177e4 LT |
340 | #define set_mm_counter(mm, member, value) (mm)->_##member = (value) |
341 | #define get_mm_counter(mm, member) ((mm)->_##member) | |
342 | #define add_mm_counter(mm, member, value) (mm)->_##member += (value) | |
343 | #define inc_mm_counter(mm, member) (mm)->_##member++ | |
344 | #define dec_mm_counter(mm, member) (mm)->_##member-- | |
f412ac08 HD |
345 | |
346 | #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */ | |
4294621f | 347 | |
f412ac08 HD |
348 | #define get_mm_rss(mm) \ |
349 | (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss)) | |
365e9c87 HD |
350 | #define update_hiwater_rss(mm) do { \ |
351 | unsigned long _rss = get_mm_rss(mm); \ | |
352 | if ((mm)->hiwater_rss < _rss) \ | |
353 | (mm)->hiwater_rss = _rss; \ | |
354 | } while (0) | |
355 | #define update_hiwater_vm(mm) do { \ | |
356 | if ((mm)->hiwater_vm < (mm)->total_vm) \ | |
357 | (mm)->hiwater_vm = (mm)->total_vm; \ | |
358 | } while (0) | |
359 | ||
6c5d5238 KH |
360 | extern void set_dumpable(struct mm_struct *mm, int value); |
361 | extern int get_dumpable(struct mm_struct *mm); | |
362 | ||
363 | /* mm flags */ | |
3cb4a0bb | 364 | /* dumpable bits */ |
6c5d5238 KH |
365 | #define MMF_DUMPABLE 0 /* core dump is permitted */ |
366 | #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */ | |
3cb4a0bb KH |
367 | #define MMF_DUMPABLE_BITS 2 |
368 | ||
369 | /* coredump filter bits */ | |
370 | #define MMF_DUMP_ANON_PRIVATE 2 | |
371 | #define MMF_DUMP_ANON_SHARED 3 | |
372 | #define MMF_DUMP_MAPPED_PRIVATE 4 | |
373 | #define MMF_DUMP_MAPPED_SHARED 5 | |
82df3973 | 374 | #define MMF_DUMP_ELF_HEADERS 6 |
3cb4a0bb | 375 | #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS |
82df3973 | 376 | #define MMF_DUMP_FILTER_BITS 5 |
3cb4a0bb KH |
377 | #define MMF_DUMP_FILTER_MASK \ |
378 | (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT) | |
379 | #define MMF_DUMP_FILTER_DEFAULT \ | |
380 | ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED)) | |
6c5d5238 | 381 | |
1da177e4 LT |
382 | struct sighand_struct { |
383 | atomic_t count; | |
384 | struct k_sigaction action[_NSIG]; | |
385 | spinlock_t siglock; | |
b8fceee1 | 386 | wait_queue_head_t signalfd_wqh; |
1da177e4 LT |
387 | }; |
388 | ||
0e464814 | 389 | struct pacct_struct { |
f6ec29a4 KK |
390 | int ac_flag; |
391 | long ac_exitcode; | |
0e464814 | 392 | unsigned long ac_mem; |
77787bfb KK |
393 | cputime_t ac_utime, ac_stime; |
394 | unsigned long ac_minflt, ac_majflt; | |
0e464814 KK |
395 | }; |
396 | ||
1da177e4 LT |
397 | /* |
398 | * NOTE! "signal_struct" does not have it's own | |
399 | * locking, because a shared signal_struct always | |
400 | * implies a shared sighand_struct, so locking | |
401 | * sighand_struct is always a proper superset of | |
402 | * the locking of signal_struct. | |
403 | */ | |
404 | struct signal_struct { | |
405 | atomic_t count; | |
406 | atomic_t live; | |
407 | ||
408 | wait_queue_head_t wait_chldexit; /* for wait4() */ | |
409 | ||
410 | /* current thread group signal load-balancing target: */ | |
36c8b586 | 411 | struct task_struct *curr_target; |
1da177e4 LT |
412 | |
413 | /* shared signal handling: */ | |
414 | struct sigpending shared_pending; | |
415 | ||
416 | /* thread group exit support */ | |
417 | int group_exit_code; | |
418 | /* overloaded: | |
419 | * - notify group_exit_task when ->count is equal to notify_count | |
420 | * - everyone except group_exit_task is stopped during signal delivery | |
421 | * of fatal signals, group_exit_task processes the signal. | |
422 | */ | |
423 | struct task_struct *group_exit_task; | |
424 | int notify_count; | |
425 | ||
426 | /* thread group stop support, overloads group_exit_code too */ | |
427 | int group_stop_count; | |
428 | unsigned int flags; /* see SIGNAL_* flags below */ | |
429 | ||
430 | /* POSIX.1b Interval Timers */ | |
431 | struct list_head posix_timers; | |
432 | ||
433 | /* ITIMER_REAL timer for the process */ | |
2ff678b8 | 434 | struct hrtimer real_timer; |
05cfb614 | 435 | struct task_struct *tsk; |
2ff678b8 | 436 | ktime_t it_real_incr; |
1da177e4 LT |
437 | |
438 | /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */ | |
439 | cputime_t it_prof_expires, it_virt_expires; | |
440 | cputime_t it_prof_incr, it_virt_incr; | |
441 | ||
442 | /* job control IDs */ | |
9a2e7057 PE |
443 | |
444 | /* | |
445 | * pgrp and session fields are deprecated. | |
446 | * use the task_session_Xnr and task_pgrp_Xnr routines below | |
447 | */ | |
448 | ||
449 | union { | |
450 | pid_t pgrp __deprecated; | |
451 | pid_t __pgrp; | |
452 | }; | |
453 | ||
ab521dc0 | 454 | struct pid *tty_old_pgrp; |
1ec320af CLG |
455 | |
456 | union { | |
457 | pid_t session __deprecated; | |
458 | pid_t __session; | |
459 | }; | |
460 | ||
1da177e4 LT |
461 | /* boolean value for session group leader */ |
462 | int leader; | |
463 | ||
464 | struct tty_struct *tty; /* NULL if no tty */ | |
465 | ||
466 | /* | |
467 | * Cumulative resource counters for dead threads in the group, | |
468 | * and for reaped dead child processes forked by this group. | |
469 | * Live threads maintain their own counters and add to these | |
470 | * in __exit_signal, except for the group leader. | |
471 | */ | |
472 | cputime_t utime, stime, cutime, cstime; | |
9ac52315 LV |
473 | cputime_t gtime; |
474 | cputime_t cgtime; | |
1da177e4 LT |
475 | unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; |
476 | unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; | |
6eaeeaba | 477 | unsigned long inblock, oublock, cinblock, coublock; |
1da177e4 LT |
478 | |
479 | /* | |
480 | * Cumulative ns of scheduled CPU time for dead threads in the | |
481 | * group, not including a zombie group leader. (This only differs | |
482 | * from jiffies_to_ns(utime + stime) if sched_clock uses something | |
483 | * other than jiffies.) | |
484 | */ | |
41b86e9c | 485 | unsigned long long sum_sched_runtime; |
1da177e4 LT |
486 | |
487 | /* | |
488 | * We don't bother to synchronize most readers of this at all, | |
489 | * because there is no reader checking a limit that actually needs | |
490 | * to get both rlim_cur and rlim_max atomically, and either one | |
491 | * alone is a single word that can safely be read normally. | |
492 | * getrlimit/setrlimit use task_lock(current->group_leader) to | |
493 | * protect this instead of the siglock, because they really | |
494 | * have no need to disable irqs. | |
495 | */ | |
496 | struct rlimit rlim[RLIM_NLIMITS]; | |
497 | ||
498 | struct list_head cpu_timers[3]; | |
499 | ||
500 | /* keep the process-shared keyrings here so that they do the right | |
501 | * thing in threads created with CLONE_THREAD */ | |
502 | #ifdef CONFIG_KEYS | |
503 | struct key *session_keyring; /* keyring inherited over fork */ | |
504 | struct key *process_keyring; /* keyring private to this process */ | |
505 | #endif | |
0e464814 KK |
506 | #ifdef CONFIG_BSD_PROCESS_ACCT |
507 | struct pacct_struct pacct; /* per-process accounting information */ | |
508 | #endif | |
ad4ecbcb | 509 | #ifdef CONFIG_TASKSTATS |
ad4ecbcb SN |
510 | struct taskstats *stats; |
511 | #endif | |
522ed776 MT |
512 | #ifdef CONFIG_AUDIT |
513 | unsigned audit_tty; | |
514 | struct tty_audit_buf *tty_audit_buf; | |
515 | #endif | |
1da177e4 LT |
516 | }; |
517 | ||
4866cde0 NP |
518 | /* Context switch must be unlocked if interrupts are to be enabled */ |
519 | #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW | |
520 | # define __ARCH_WANT_UNLOCKED_CTXSW | |
521 | #endif | |
522 | ||
1da177e4 LT |
523 | /* |
524 | * Bits in flags field of signal_struct. | |
525 | */ | |
526 | #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ | |
527 | #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */ | |
528 | #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */ | |
529 | #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */ | |
530 | ||
1da177e4 LT |
531 | /* |
532 | * Some day this will be a full-fledged user tracking system.. | |
533 | */ | |
534 | struct user_struct { | |
535 | atomic_t __count; /* reference count */ | |
536 | atomic_t processes; /* How many processes does this user have? */ | |
537 | atomic_t files; /* How many open files does this user have? */ | |
538 | atomic_t sigpending; /* How many pending signals does this user have? */ | |
2d9048e2 | 539 | #ifdef CONFIG_INOTIFY_USER |
0eeca283 RL |
540 | atomic_t inotify_watches; /* How many inotify watches does this user have? */ |
541 | atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ | |
542 | #endif | |
970a8645 | 543 | #ifdef CONFIG_POSIX_MQUEUE |
1da177e4 LT |
544 | /* protected by mq_lock */ |
545 | unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ | |
970a8645 | 546 | #endif |
1da177e4 LT |
547 | unsigned long locked_shm; /* How many pages of mlocked shm ? */ |
548 | ||
549 | #ifdef CONFIG_KEYS | |
550 | struct key *uid_keyring; /* UID specific keyring */ | |
551 | struct key *session_keyring; /* UID's default session keyring */ | |
552 | #endif | |
553 | ||
554 | /* Hash table maintenance information */ | |
735de223 | 555 | struct hlist_node uidhash_node; |
1da177e4 | 556 | uid_t uid; |
24e377a8 SV |
557 | |
558 | #ifdef CONFIG_FAIR_USER_SCHED | |
4cf86d77 | 559 | struct task_group *tg; |
b1a8c172 | 560 | #ifdef CONFIG_SYSFS |
eb41d946 | 561 | struct kobject kobj; |
5cb350ba | 562 | struct work_struct work; |
24e377a8 | 563 | #endif |
b1a8c172 | 564 | #endif |
1da177e4 LT |
565 | }; |
566 | ||
eb41d946 | 567 | extern int uids_sysfs_init(void); |
5cb350ba | 568 | |
1da177e4 LT |
569 | extern struct user_struct *find_user(uid_t); |
570 | ||
571 | extern struct user_struct root_user; | |
572 | #define INIT_USER (&root_user) | |
573 | ||
1da177e4 LT |
574 | struct backing_dev_info; |
575 | struct reclaim_state; | |
576 | ||
52f17b6c | 577 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
1da177e4 LT |
578 | struct sched_info { |
579 | /* cumulative counters */ | |
2d72376b | 580 | unsigned long pcount; /* # of times run on this cpu */ |
172ba844 BS |
581 | unsigned long long cpu_time, /* time spent on the cpu */ |
582 | run_delay; /* time spent waiting on a runqueue */ | |
1da177e4 LT |
583 | |
584 | /* timestamps */ | |
172ba844 BS |
585 | unsigned long long last_arrival,/* when we last ran on a cpu */ |
586 | last_queued; /* when we were last queued to run */ | |
b8efb561 IM |
587 | #ifdef CONFIG_SCHEDSTATS |
588 | /* BKL stats */ | |
480b9434 | 589 | unsigned int bkl_count; |
b8efb561 | 590 | #endif |
1da177e4 | 591 | }; |
52f17b6c | 592 | #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */ |
1da177e4 | 593 | |
52f17b6c | 594 | #ifdef CONFIG_SCHEDSTATS |
15ad7cdc | 595 | extern const struct file_operations proc_schedstat_operations; |
52f17b6c | 596 | #endif /* CONFIG_SCHEDSTATS */ |
1da177e4 | 597 | |
ca74e92b SN |
598 | #ifdef CONFIG_TASK_DELAY_ACCT |
599 | struct task_delay_info { | |
600 | spinlock_t lock; | |
601 | unsigned int flags; /* Private per-task flags */ | |
602 | ||
603 | /* For each stat XXX, add following, aligned appropriately | |
604 | * | |
605 | * struct timespec XXX_start, XXX_end; | |
606 | * u64 XXX_delay; | |
607 | * u32 XXX_count; | |
608 | * | |
609 | * Atomicity of updates to XXX_delay, XXX_count protected by | |
610 | * single lock above (split into XXX_lock if contention is an issue). | |
611 | */ | |
0ff92245 SN |
612 | |
613 | /* | |
614 | * XXX_count is incremented on every XXX operation, the delay | |
615 | * associated with the operation is added to XXX_delay. | |
616 | * XXX_delay contains the accumulated delay time in nanoseconds. | |
617 | */ | |
618 | struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */ | |
619 | u64 blkio_delay; /* wait for sync block io completion */ | |
620 | u64 swapin_delay; /* wait for swapin block io completion */ | |
621 | u32 blkio_count; /* total count of the number of sync block */ | |
622 | /* io operations performed */ | |
623 | u32 swapin_count; /* total count of the number of swapin block */ | |
624 | /* io operations performed */ | |
ca74e92b | 625 | }; |
52f17b6c CS |
626 | #endif /* CONFIG_TASK_DELAY_ACCT */ |
627 | ||
628 | static inline int sched_info_on(void) | |
629 | { | |
630 | #ifdef CONFIG_SCHEDSTATS | |
631 | return 1; | |
632 | #elif defined(CONFIG_TASK_DELAY_ACCT) | |
633 | extern int delayacct_on; | |
634 | return delayacct_on; | |
635 | #else | |
636 | return 0; | |
ca74e92b | 637 | #endif |
52f17b6c | 638 | } |
ca74e92b | 639 | |
d15bcfdb IM |
640 | enum cpu_idle_type { |
641 | CPU_IDLE, | |
642 | CPU_NOT_IDLE, | |
643 | CPU_NEWLY_IDLE, | |
644 | CPU_MAX_IDLE_TYPES | |
1da177e4 LT |
645 | }; |
646 | ||
647 | /* | |
648 | * sched-domains (multiprocessor balancing) declarations: | |
649 | */ | |
9aa7b369 IM |
650 | |
651 | /* | |
652 | * Increase resolution of nice-level calculations: | |
653 | */ | |
654 | #define SCHED_LOAD_SHIFT 10 | |
655 | #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT) | |
656 | ||
f8700df7 | 657 | #define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE |
1da177e4 | 658 | |
2dd73a4f | 659 | #ifdef CONFIG_SMP |
1da177e4 LT |
660 | #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */ |
661 | #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */ | |
662 | #define SD_BALANCE_EXEC 4 /* Balance on exec */ | |
147cbb4b NP |
663 | #define SD_BALANCE_FORK 8 /* Balance on fork, clone */ |
664 | #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */ | |
665 | #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */ | |
666 | #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */ | |
667 | #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */ | |
5c45bf27 | 668 | #define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */ |
89c4710e | 669 | #define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */ |
08c183f3 | 670 | #define SD_SERIALIZE 1024 /* Only a single load balancing instance */ |
5c45bf27 | 671 | |
89c4710e SS |
672 | #define BALANCE_FOR_MC_POWER \ |
673 | (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0) | |
674 | ||
675 | #define BALANCE_FOR_PKG_POWER \ | |
676 | ((sched_mc_power_savings || sched_smt_power_savings) ? \ | |
677 | SD_POWERSAVINGS_BALANCE : 0) | |
678 | ||
679 | #define test_sd_parent(sd, flag) ((sd->parent && \ | |
680 | (sd->parent->flags & flag)) ? 1 : 0) | |
5c45bf27 | 681 | |
1da177e4 LT |
682 | |
683 | struct sched_group { | |
684 | struct sched_group *next; /* Must be a circular list */ | |
685 | cpumask_t cpumask; | |
686 | ||
687 | /* | |
688 | * CPU power of this group, SCHED_LOAD_SCALE being max power for a | |
689 | * single CPU. This is read only (except for setup, hotplug CPU). | |
5517d86b | 690 | * Note : Never change cpu_power without recompute its reciprocal |
1da177e4 | 691 | */ |
5517d86b ED |
692 | unsigned int __cpu_power; |
693 | /* | |
694 | * reciprocal value of cpu_power to avoid expensive divides | |
695 | * (see include/linux/reciprocal_div.h) | |
696 | */ | |
697 | u32 reciprocal_cpu_power; | |
1da177e4 LT |
698 | }; |
699 | ||
700 | struct sched_domain { | |
701 | /* These fields must be setup */ | |
702 | struct sched_domain *parent; /* top domain must be null terminated */ | |
1a848870 | 703 | struct sched_domain *child; /* bottom domain must be null terminated */ |
1da177e4 LT |
704 | struct sched_group *groups; /* the balancing groups of the domain */ |
705 | cpumask_t span; /* span of all CPUs in this domain */ | |
706 | unsigned long min_interval; /* Minimum balance interval ms */ | |
707 | unsigned long max_interval; /* Maximum balance interval ms */ | |
708 | unsigned int busy_factor; /* less balancing by factor if busy */ | |
709 | unsigned int imbalance_pct; /* No balance until over watermark */ | |
1da177e4 | 710 | unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ |
7897986b NP |
711 | unsigned int busy_idx; |
712 | unsigned int idle_idx; | |
713 | unsigned int newidle_idx; | |
714 | unsigned int wake_idx; | |
147cbb4b | 715 | unsigned int forkexec_idx; |
1da177e4 LT |
716 | int flags; /* See SD_* */ |
717 | ||
718 | /* Runtime fields. */ | |
719 | unsigned long last_balance; /* init to jiffies. units in jiffies */ | |
720 | unsigned int balance_interval; /* initialise to 1. units in ms. */ | |
721 | unsigned int nr_balance_failed; /* initialise to 0 */ | |
722 | ||
723 | #ifdef CONFIG_SCHEDSTATS | |
724 | /* load_balance() stats */ | |
480b9434 KC |
725 | unsigned int lb_count[CPU_MAX_IDLE_TYPES]; |
726 | unsigned int lb_failed[CPU_MAX_IDLE_TYPES]; | |
727 | unsigned int lb_balanced[CPU_MAX_IDLE_TYPES]; | |
728 | unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES]; | |
729 | unsigned int lb_gained[CPU_MAX_IDLE_TYPES]; | |
730 | unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; | |
731 | unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; | |
732 | unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; | |
1da177e4 LT |
733 | |
734 | /* Active load balancing */ | |
480b9434 KC |
735 | unsigned int alb_count; |
736 | unsigned int alb_failed; | |
737 | unsigned int alb_pushed; | |
1da177e4 | 738 | |
68767a0a | 739 | /* SD_BALANCE_EXEC stats */ |
480b9434 KC |
740 | unsigned int sbe_count; |
741 | unsigned int sbe_balanced; | |
742 | unsigned int sbe_pushed; | |
1da177e4 | 743 | |
68767a0a | 744 | /* SD_BALANCE_FORK stats */ |
480b9434 KC |
745 | unsigned int sbf_count; |
746 | unsigned int sbf_balanced; | |
747 | unsigned int sbf_pushed; | |
68767a0a | 748 | |
1da177e4 | 749 | /* try_to_wake_up() stats */ |
480b9434 KC |
750 | unsigned int ttwu_wake_remote; |
751 | unsigned int ttwu_move_affine; | |
752 | unsigned int ttwu_move_balance; | |
1da177e4 LT |
753 | #endif |
754 | }; | |
755 | ||
029190c5 PJ |
756 | extern void partition_sched_domains(int ndoms_new, cpumask_t *doms_new); |
757 | ||
198e2f18 | 758 | #endif /* CONFIG_SMP */ |
1da177e4 | 759 | |
d02c7a8c CK |
760 | /* |
761 | * A runqueue laden with a single nice 0 task scores a weighted_cpuload of | |
762 | * SCHED_LOAD_SCALE. This function returns 1 if any cpu is laden with a | |
763 | * task of nice 0 or enough lower priority tasks to bring up the | |
764 | * weighted_cpuload | |
765 | */ | |
766 | static inline int above_background_load(void) | |
767 | { | |
768 | unsigned long cpu; | |
769 | ||
770 | for_each_online_cpu(cpu) { | |
771 | if (weighted_cpuload(cpu) >= SCHED_LOAD_SCALE) | |
772 | return 1; | |
773 | } | |
774 | return 0; | |
775 | } | |
1da177e4 LT |
776 | |
777 | struct io_context; /* See blkdev.h */ | |
1da177e4 LT |
778 | #define NGROUPS_SMALL 32 |
779 | #define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t))) | |
780 | struct group_info { | |
781 | int ngroups; | |
782 | atomic_t usage; | |
783 | gid_t small_block[NGROUPS_SMALL]; | |
784 | int nblocks; | |
785 | gid_t *blocks[0]; | |
786 | }; | |
787 | ||
788 | /* | |
789 | * get_group_info() must be called with the owning task locked (via task_lock()) | |
790 | * when task != current. The reason being that the vast majority of callers are | |
791 | * looking at current->group_info, which can not be changed except by the | |
792 | * current task. Changing current->group_info requires the task lock, too. | |
793 | */ | |
794 | #define get_group_info(group_info) do { \ | |
795 | atomic_inc(&(group_info)->usage); \ | |
796 | } while (0) | |
797 | ||
798 | #define put_group_info(group_info) do { \ | |
799 | if (atomic_dec_and_test(&(group_info)->usage)) \ | |
800 | groups_free(group_info); \ | |
801 | } while (0) | |
802 | ||
3e30148c DH |
803 | extern struct group_info *groups_alloc(int gidsetsize); |
804 | extern void groups_free(struct group_info *group_info); | |
805 | extern int set_current_groups(struct group_info *group_info); | |
806 | extern int groups_search(struct group_info *group_info, gid_t grp); | |
1da177e4 LT |
807 | /* access the groups "array" with this macro */ |
808 | #define GROUP_AT(gi, i) \ | |
809 | ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK]) | |
810 | ||
383f2835 | 811 | #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK |
36c8b586 | 812 | extern void prefetch_stack(struct task_struct *t); |
383f2835 KC |
813 | #else |
814 | static inline void prefetch_stack(struct task_struct *t) { } | |
815 | #endif | |
1da177e4 LT |
816 | |
817 | struct audit_context; /* See audit.c */ | |
818 | struct mempolicy; | |
b92ce558 | 819 | struct pipe_inode_info; |
4865ecf1 | 820 | struct uts_namespace; |
1da177e4 | 821 | |
20b8a59f IM |
822 | struct rq; |
823 | struct sched_domain; | |
824 | ||
825 | struct sched_class { | |
5522d5d5 | 826 | const struct sched_class *next; |
20b8a59f | 827 | |
fd390f6a | 828 | void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup); |
f02231e5 | 829 | void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep); |
4530d7ab | 830 | void (*yield_task) (struct rq *rq); |
e7693a36 | 831 | int (*select_task_rq)(struct task_struct *p, int sync); |
20b8a59f IM |
832 | |
833 | void (*check_preempt_curr) (struct rq *rq, struct task_struct *p); | |
834 | ||
fb8d4724 | 835 | struct task_struct * (*pick_next_task) (struct rq *rq); |
31ee529c | 836 | void (*put_prev_task) (struct rq *rq, struct task_struct *p); |
20b8a59f | 837 | |
681f3e68 | 838 | #ifdef CONFIG_SMP |
43010659 | 839 | unsigned long (*load_balance) (struct rq *this_rq, int this_cpu, |
e1d1484f | 840 | struct rq *busiest, unsigned long max_load_move, |
20b8a59f | 841 | struct sched_domain *sd, enum cpu_idle_type idle, |
a4ac01c3 | 842 | int *all_pinned, int *this_best_prio); |
20b8a59f | 843 | |
e1d1484f PW |
844 | int (*move_one_task) (struct rq *this_rq, int this_cpu, |
845 | struct rq *busiest, struct sched_domain *sd, | |
846 | enum cpu_idle_type idle); | |
9a897c5a SR |
847 | void (*pre_schedule) (struct rq *this_rq, struct task_struct *task); |
848 | void (*post_schedule) (struct rq *this_rq); | |
849 | void (*task_wake_up) (struct rq *this_rq, struct task_struct *task); | |
681f3e68 | 850 | #endif |
e1d1484f | 851 | |
83b699ed | 852 | void (*set_curr_task) (struct rq *rq); |
8f4d37ec | 853 | void (*task_tick) (struct rq *rq, struct task_struct *p, int queued); |
ee0827d8 | 854 | void (*task_new) (struct rq *rq, struct task_struct *p); |
73fe6aae | 855 | void (*set_cpus_allowed)(struct task_struct *p, cpumask_t *newmask); |
57d885fe GH |
856 | |
857 | void (*join_domain)(struct rq *rq); | |
858 | void (*leave_domain)(struct rq *rq); | |
cb469845 SR |
859 | |
860 | void (*switched_from) (struct rq *this_rq, struct task_struct *task, | |
861 | int running); | |
862 | void (*switched_to) (struct rq *this_rq, struct task_struct *task, | |
863 | int running); | |
864 | void (*prio_changed) (struct rq *this_rq, struct task_struct *task, | |
865 | int oldprio, int running); | |
20b8a59f IM |
866 | }; |
867 | ||
868 | struct load_weight { | |
869 | unsigned long weight, inv_weight; | |
870 | }; | |
871 | ||
872 | /* | |
873 | * CFS stats for a schedulable entity (task, task-group etc) | |
874 | * | |
875 | * Current field usage histogram: | |
876 | * | |
877 | * 4 se->block_start | |
878 | * 4 se->run_node | |
879 | * 4 se->sleep_start | |
20b8a59f | 880 | * 6 se->load.weight |
20b8a59f IM |
881 | */ |
882 | struct sched_entity { | |
20b8a59f IM |
883 | struct load_weight load; /* for load-balancing */ |
884 | struct rb_node run_node; | |
885 | unsigned int on_rq; | |
886 | ||
94c18227 IM |
887 | u64 exec_start; |
888 | u64 sum_exec_runtime; | |
e9acbff6 | 889 | u64 vruntime; |
f6cf891c | 890 | u64 prev_sum_exec_runtime; |
94c18227 IM |
891 | |
892 | #ifdef CONFIG_SCHEDSTATS | |
20b8a59f | 893 | u64 wait_start; |
94c18227 | 894 | u64 wait_max; |
94c18227 | 895 | |
20b8a59f | 896 | u64 sleep_start; |
20b8a59f | 897 | u64 sleep_max; |
94c18227 IM |
898 | s64 sum_sleep_runtime; |
899 | ||
900 | u64 block_start; | |
20b8a59f IM |
901 | u64 block_max; |
902 | u64 exec_max; | |
eba1ed4b | 903 | u64 slice_max; |
cc367732 IM |
904 | |
905 | u64 nr_migrations; | |
906 | u64 nr_migrations_cold; | |
907 | u64 nr_failed_migrations_affine; | |
908 | u64 nr_failed_migrations_running; | |
909 | u64 nr_failed_migrations_hot; | |
910 | u64 nr_forced_migrations; | |
911 | u64 nr_forced2_migrations; | |
912 | ||
913 | u64 nr_wakeups; | |
914 | u64 nr_wakeups_sync; | |
915 | u64 nr_wakeups_migrate; | |
916 | u64 nr_wakeups_local; | |
917 | u64 nr_wakeups_remote; | |
918 | u64 nr_wakeups_affine; | |
919 | u64 nr_wakeups_affine_attempts; | |
920 | u64 nr_wakeups_passive; | |
921 | u64 nr_wakeups_idle; | |
94c18227 IM |
922 | #endif |
923 | ||
20b8a59f IM |
924 | #ifdef CONFIG_FAIR_GROUP_SCHED |
925 | struct sched_entity *parent; | |
926 | /* rq on which this entity is (to be) queued: */ | |
927 | struct cfs_rq *cfs_rq; | |
928 | /* rq "owned" by this entity/group: */ | |
929 | struct cfs_rq *my_q; | |
930 | #endif | |
931 | }; | |
70b97a7f | 932 | |
fa717060 PZ |
933 | struct sched_rt_entity { |
934 | struct list_head run_list; | |
935 | unsigned int time_slice; | |
78f2c7db | 936 | unsigned long timeout; |
fa717060 PZ |
937 | }; |
938 | ||
1da177e4 LT |
939 | struct task_struct { |
940 | volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ | |
f7e4217b | 941 | void *stack; |
1da177e4 | 942 | atomic_t usage; |
97dc32cd WC |
943 | unsigned int flags; /* per process flags, defined below */ |
944 | unsigned int ptrace; | |
1da177e4 | 945 | |
36772092 | 946 | int lock_depth; /* BKL lock depth */ |
1da177e4 | 947 | |
2dd73a4f PW |
948 | #ifdef CONFIG_SMP |
949 | #ifdef __ARCH_WANT_UNLOCKED_CTXSW | |
4866cde0 NP |
950 | int oncpu; |
951 | #endif | |
2dd73a4f | 952 | #endif |
50e645a8 | 953 | |
b29739f9 | 954 | int prio, static_prio, normal_prio; |
5522d5d5 | 955 | const struct sched_class *sched_class; |
20b8a59f | 956 | struct sched_entity se; |
fa717060 | 957 | struct sched_rt_entity rt; |
1da177e4 | 958 | |
e107be36 AK |
959 | #ifdef CONFIG_PREEMPT_NOTIFIERS |
960 | /* list of struct preempt_notifier: */ | |
961 | struct hlist_head preempt_notifiers; | |
962 | #endif | |
963 | ||
22e2c507 | 964 | unsigned short ioprio; |
18796aa0 AD |
965 | /* |
966 | * fpu_counter contains the number of consecutive context switches | |
967 | * that the FPU is used. If this is over a threshold, the lazy fpu | |
968 | * saving becomes unlazy to save the trap. This is an unsigned char | |
969 | * so that after 256 times the counter wraps and the behavior turns | |
970 | * lazy again; this to deal with bursty apps that only use FPU for | |
971 | * a short time | |
972 | */ | |
973 | unsigned char fpu_counter; | |
974 | s8 oomkilladj; /* OOM kill score adjustment (bit shift). */ | |
6c5c9341 | 975 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 976 | unsigned int btrace_seq; |
6c5c9341 | 977 | #endif |
1da177e4 | 978 | |
97dc32cd | 979 | unsigned int policy; |
1da177e4 | 980 | cpumask_t cpus_allowed; |
73fe6aae | 981 | int nr_cpus_allowed; |
1da177e4 | 982 | |
e260be67 PM |
983 | #ifdef CONFIG_PREEMPT_RCU |
984 | int rcu_read_lock_nesting; | |
985 | int rcu_flipctr_idx; | |
986 | #endif /* #ifdef CONFIG_PREEMPT_RCU */ | |
987 | ||
52f17b6c | 988 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
1da177e4 LT |
989 | struct sched_info sched_info; |
990 | #endif | |
991 | ||
992 | struct list_head tasks; | |
993 | /* | |
994 | * ptrace_list/ptrace_children forms the list of my children | |
995 | * that were stolen by a ptracer. | |
996 | */ | |
997 | struct list_head ptrace_children; | |
998 | struct list_head ptrace_list; | |
999 | ||
1000 | struct mm_struct *mm, *active_mm; | |
1001 | ||
1002 | /* task state */ | |
1003 | struct linux_binfmt *binfmt; | |
97dc32cd | 1004 | int exit_state; |
1da177e4 LT |
1005 | int exit_code, exit_signal; |
1006 | int pdeath_signal; /* The signal sent when the parent dies */ | |
1007 | /* ??? */ | |
97dc32cd | 1008 | unsigned int personality; |
1da177e4 LT |
1009 | unsigned did_exec:1; |
1010 | pid_t pid; | |
1011 | pid_t tgid; | |
0a425405 AV |
1012 | |
1013 | #ifdef CONFIG_CC_STACKPROTECTOR | |
1014 | /* Canary value for the -fstack-protector gcc feature */ | |
1015 | unsigned long stack_canary; | |
1016 | #endif | |
1da177e4 LT |
1017 | /* |
1018 | * pointers to (original) parent process, youngest child, younger sibling, | |
1019 | * older sibling, respectively. (p->father can be replaced with | |
1020 | * p->parent->pid) | |
1021 | */ | |
1022 | struct task_struct *real_parent; /* real parent process (when being debugged) */ | |
1023 | struct task_struct *parent; /* parent process */ | |
1024 | /* | |
1025 | * children/sibling forms the list of my children plus the | |
1026 | * tasks I'm ptracing. | |
1027 | */ | |
1028 | struct list_head children; /* list of my children */ | |
1029 | struct list_head sibling; /* linkage in my parent's children list */ | |
1030 | struct task_struct *group_leader; /* threadgroup leader */ | |
1031 | ||
1032 | /* PID/PID hash table linkage. */ | |
92476d7f | 1033 | struct pid_link pids[PIDTYPE_MAX]; |
47e65328 | 1034 | struct list_head thread_group; |
1da177e4 LT |
1035 | |
1036 | struct completion *vfork_done; /* for vfork() */ | |
1037 | int __user *set_child_tid; /* CLONE_CHILD_SETTID */ | |
1038 | int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ | |
1039 | ||
97dc32cd | 1040 | unsigned int rt_priority; |
c66f08be | 1041 | cputime_t utime, stime, utimescaled, stimescaled; |
9ac52315 | 1042 | cputime_t gtime; |
9301899b | 1043 | cputime_t prev_utime, prev_stime; |
1da177e4 | 1044 | unsigned long nvcsw, nivcsw; /* context switch counts */ |
924b42d5 TJ |
1045 | struct timespec start_time; /* monotonic time */ |
1046 | struct timespec real_start_time; /* boot based time */ | |
1da177e4 LT |
1047 | /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ |
1048 | unsigned long min_flt, maj_flt; | |
1049 | ||
1050 | cputime_t it_prof_expires, it_virt_expires; | |
1051 | unsigned long long it_sched_expires; | |
1052 | struct list_head cpu_timers[3]; | |
1053 | ||
1054 | /* process credentials */ | |
1055 | uid_t uid,euid,suid,fsuid; | |
1056 | gid_t gid,egid,sgid,fsgid; | |
1057 | struct group_info *group_info; | |
1058 | kernel_cap_t cap_effective, cap_inheritable, cap_permitted; | |
1059 | unsigned keep_capabilities:1; | |
1060 | struct user_struct *user; | |
1061 | #ifdef CONFIG_KEYS | |
b5f545c8 | 1062 | struct key *request_key_auth; /* assumed request_key authority */ |
1da177e4 | 1063 | struct key *thread_keyring; /* keyring private to this thread */ |
3e30148c | 1064 | unsigned char jit_keyring; /* default keyring to attach requested keys to */ |
1da177e4 | 1065 | #endif |
36772092 PBG |
1066 | char comm[TASK_COMM_LEN]; /* executable name excluding path |
1067 | - access with [gs]et_task_comm (which lock | |
1068 | it with task_lock()) | |
1069 | - initialized normally by flush_old_exec */ | |
1da177e4 LT |
1070 | /* file system info */ |
1071 | int link_count, total_link_count; | |
3d5b6fcc | 1072 | #ifdef CONFIG_SYSVIPC |
1da177e4 LT |
1073 | /* ipc stuff */ |
1074 | struct sysv_sem sysvsem; | |
3d5b6fcc | 1075 | #endif |
82a1fcb9 IM |
1076 | #ifdef CONFIG_DETECT_SOFTLOCKUP |
1077 | /* hung task detection */ | |
1078 | unsigned long last_switch_timestamp; | |
1079 | unsigned long last_switch_count; | |
1080 | #endif | |
1da177e4 LT |
1081 | /* CPU-specific state of this task */ |
1082 | struct thread_struct thread; | |
1083 | /* filesystem information */ | |
1084 | struct fs_struct *fs; | |
1085 | /* open file information */ | |
1086 | struct files_struct *files; | |
1651e14e | 1087 | /* namespaces */ |
ab516013 | 1088 | struct nsproxy *nsproxy; |
1da177e4 LT |
1089 | /* signal handlers */ |
1090 | struct signal_struct *signal; | |
1091 | struct sighand_struct *sighand; | |
1092 | ||
1093 | sigset_t blocked, real_blocked; | |
150256d8 | 1094 | sigset_t saved_sigmask; /* To be restored with TIF_RESTORE_SIGMASK */ |
1da177e4 LT |
1095 | struct sigpending pending; |
1096 | ||
1097 | unsigned long sas_ss_sp; | |
1098 | size_t sas_ss_size; | |
1099 | int (*notifier)(void *priv); | |
1100 | void *notifier_data; | |
1101 | sigset_t *notifier_mask; | |
57c521ce | 1102 | #ifdef CONFIG_SECURITY |
1da177e4 | 1103 | void *security; |
57c521ce | 1104 | #endif |
1da177e4 LT |
1105 | struct audit_context *audit_context; |
1106 | seccomp_t seccomp; | |
1107 | ||
1108 | /* Thread group tracking */ | |
1109 | u32 parent_exec_id; | |
1110 | u32 self_exec_id; | |
1111 | /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */ | |
1112 | spinlock_t alloc_lock; | |
1da177e4 | 1113 | |
b29739f9 IM |
1114 | /* Protection of the PI data structures: */ |
1115 | spinlock_t pi_lock; | |
1116 | ||
23f78d4a IM |
1117 | #ifdef CONFIG_RT_MUTEXES |
1118 | /* PI waiters blocked on a rt_mutex held by this task */ | |
1119 | struct plist_head pi_waiters; | |
1120 | /* Deadlock detection and priority inheritance handling */ | |
1121 | struct rt_mutex_waiter *pi_blocked_on; | |
23f78d4a IM |
1122 | #endif |
1123 | ||
408894ee IM |
1124 | #ifdef CONFIG_DEBUG_MUTEXES |
1125 | /* mutex deadlock detection */ | |
1126 | struct mutex_waiter *blocked_on; | |
1127 | #endif | |
de30a2b3 IM |
1128 | #ifdef CONFIG_TRACE_IRQFLAGS |
1129 | unsigned int irq_events; | |
1130 | int hardirqs_enabled; | |
1131 | unsigned long hardirq_enable_ip; | |
1132 | unsigned int hardirq_enable_event; | |
1133 | unsigned long hardirq_disable_ip; | |
1134 | unsigned int hardirq_disable_event; | |
1135 | int softirqs_enabled; | |
1136 | unsigned long softirq_disable_ip; | |
1137 | unsigned int softirq_disable_event; | |
1138 | unsigned long softirq_enable_ip; | |
1139 | unsigned int softirq_enable_event; | |
1140 | int hardirq_context; | |
1141 | int softirq_context; | |
1142 | #endif | |
fbb9ce95 IM |
1143 | #ifdef CONFIG_LOCKDEP |
1144 | # define MAX_LOCK_DEPTH 30UL | |
1145 | u64 curr_chain_key; | |
1146 | int lockdep_depth; | |
1147 | struct held_lock held_locks[MAX_LOCK_DEPTH]; | |
1148 | unsigned int lockdep_recursion; | |
1149 | #endif | |
408894ee | 1150 | |
1da177e4 LT |
1151 | /* journalling filesystem info */ |
1152 | void *journal_info; | |
1153 | ||
d89d8796 NB |
1154 | /* stacked block device info */ |
1155 | struct bio *bio_list, **bio_tail; | |
1156 | ||
1da177e4 LT |
1157 | /* VM state */ |
1158 | struct reclaim_state *reclaim_state; | |
1159 | ||
1da177e4 LT |
1160 | struct backing_dev_info *backing_dev_info; |
1161 | ||
1162 | struct io_context *io_context; | |
1163 | ||
1164 | unsigned long ptrace_message; | |
1165 | siginfo_t *last_siginfo; /* For ptrace use. */ | |
4b98d11b | 1166 | #ifdef CONFIG_TASK_XACCT |
1da177e4 LT |
1167 | /* i/o counters(bytes read/written, #syscalls */ |
1168 | u64 rchar, wchar, syscr, syscw; | |
4b98d11b | 1169 | #endif |
7c3ab738 | 1170 | struct task_io_accounting ioac; |
8f0ab514 | 1171 | #if defined(CONFIG_TASK_XACCT) |
1da177e4 LT |
1172 | u64 acct_rss_mem1; /* accumulated rss usage */ |
1173 | u64 acct_vm_mem1; /* accumulated virtual memory usage */ | |
db5fed26 | 1174 | cputime_t acct_stimexpd;/* stime since last update */ |
1da177e4 LT |
1175 | #endif |
1176 | #ifdef CONFIG_NUMA | |
1177 | struct mempolicy *mempolicy; | |
1178 | short il_next; | |
1179 | #endif | |
1180 | #ifdef CONFIG_CPUSETS | |
1da177e4 LT |
1181 | nodemask_t mems_allowed; |
1182 | int cpuset_mems_generation; | |
825a46af | 1183 | int cpuset_mem_spread_rotor; |
1da177e4 | 1184 | #endif |
ddbcc7e8 | 1185 | #ifdef CONFIG_CGROUPS |
817929ec PM |
1186 | /* Control Group info protected by css_set_lock */ |
1187 | struct css_set *cgroups; | |
1188 | /* cg_list protected by css_set_lock and tsk->alloc_lock */ | |
1189 | struct list_head cg_list; | |
ddbcc7e8 | 1190 | #endif |
42b2dd0a | 1191 | #ifdef CONFIG_FUTEX |
0771dfef | 1192 | struct robust_list_head __user *robust_list; |
34f192c6 IM |
1193 | #ifdef CONFIG_COMPAT |
1194 | struct compat_robust_list_head __user *compat_robust_list; | |
1195 | #endif | |
c87e2837 IM |
1196 | struct list_head pi_state_list; |
1197 | struct futex_pi_state *pi_state_cache; | |
42b2dd0a | 1198 | #endif |
22e2c507 | 1199 | atomic_t fs_excl; /* holding fs exclusive resources */ |
e56d0903 | 1200 | struct rcu_head rcu; |
b92ce558 JA |
1201 | |
1202 | /* | |
1203 | * cache last used pipe for splice | |
1204 | */ | |
1205 | struct pipe_inode_info *splice_pipe; | |
ca74e92b SN |
1206 | #ifdef CONFIG_TASK_DELAY_ACCT |
1207 | struct task_delay_info *delays; | |
f4f154fd AM |
1208 | #endif |
1209 | #ifdef CONFIG_FAULT_INJECTION | |
1210 | int make_it_fail; | |
ca74e92b | 1211 | #endif |
3e26c149 | 1212 | struct prop_local_single dirties; |
1da177e4 LT |
1213 | }; |
1214 | ||
e05606d3 IM |
1215 | /* |
1216 | * Priority of a process goes from 0..MAX_PRIO-1, valid RT | |
1217 | * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH | |
1218 | * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority | |
1219 | * values are inverted: lower p->prio value means higher priority. | |
1220 | * | |
1221 | * The MAX_USER_RT_PRIO value allows the actual maximum | |
1222 | * RT priority to be separate from the value exported to | |
1223 | * user-space. This allows kernel threads to set their | |
1224 | * priority to a value higher than any user task. Note: | |
1225 | * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. | |
1226 | */ | |
1227 | ||
1228 | #define MAX_USER_RT_PRIO 100 | |
1229 | #define MAX_RT_PRIO MAX_USER_RT_PRIO | |
1230 | ||
1231 | #define MAX_PRIO (MAX_RT_PRIO + 40) | |
1232 | #define DEFAULT_PRIO (MAX_RT_PRIO + 20) | |
1233 | ||
1234 | static inline int rt_prio(int prio) | |
1235 | { | |
1236 | if (unlikely(prio < MAX_RT_PRIO)) | |
1237 | return 1; | |
1238 | return 0; | |
1239 | } | |
1240 | ||
e868171a | 1241 | static inline int rt_task(struct task_struct *p) |
e05606d3 IM |
1242 | { |
1243 | return rt_prio(p->prio); | |
1244 | } | |
1245 | ||
a47afb0f | 1246 | static inline void set_task_session(struct task_struct *tsk, pid_t session) |
937949d9 | 1247 | { |
a47afb0f | 1248 | tsk->signal->__session = session; |
937949d9 CLG |
1249 | } |
1250 | ||
9a2e7057 PE |
1251 | static inline void set_task_pgrp(struct task_struct *tsk, pid_t pgrp) |
1252 | { | |
1253 | tsk->signal->__pgrp = pgrp; | |
1254 | } | |
1255 | ||
e868171a | 1256 | static inline struct pid *task_pid(struct task_struct *task) |
22c935f4 EB |
1257 | { |
1258 | return task->pids[PIDTYPE_PID].pid; | |
1259 | } | |
1260 | ||
e868171a | 1261 | static inline struct pid *task_tgid(struct task_struct *task) |
22c935f4 EB |
1262 | { |
1263 | return task->group_leader->pids[PIDTYPE_PID].pid; | |
1264 | } | |
1265 | ||
e868171a | 1266 | static inline struct pid *task_pgrp(struct task_struct *task) |
22c935f4 EB |
1267 | { |
1268 | return task->group_leader->pids[PIDTYPE_PGID].pid; | |
1269 | } | |
1270 | ||
e868171a | 1271 | static inline struct pid *task_session(struct task_struct *task) |
22c935f4 EB |
1272 | { |
1273 | return task->group_leader->pids[PIDTYPE_SID].pid; | |
1274 | } | |
1275 | ||
7af57294 PE |
1276 | struct pid_namespace; |
1277 | ||
1278 | /* | |
1279 | * the helpers to get the task's different pids as they are seen | |
1280 | * from various namespaces | |
1281 | * | |
1282 | * task_xid_nr() : global id, i.e. the id seen from the init namespace; | |
1283 | * task_xid_vnr() : virtual id, i.e. the id seen from the namespace the task | |
1284 | * belongs to. this only makes sence when called in the | |
1285 | * context of the task that belongs to the same namespace; | |
1286 | * task_xid_nr_ns() : id seen from the ns specified; | |
1287 | * | |
1288 | * set_task_vxid() : assigns a virtual id to a task; | |
1289 | * | |
7af57294 PE |
1290 | * see also pid_nr() etc in include/linux/pid.h |
1291 | */ | |
1292 | ||
e868171a | 1293 | static inline pid_t task_pid_nr(struct task_struct *tsk) |
7af57294 PE |
1294 | { |
1295 | return tsk->pid; | |
1296 | } | |
1297 | ||
2f2a3a46 | 1298 | pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); |
7af57294 PE |
1299 | |
1300 | static inline pid_t task_pid_vnr(struct task_struct *tsk) | |
1301 | { | |
1302 | return pid_vnr(task_pid(tsk)); | |
1303 | } | |
1304 | ||
1305 | ||
e868171a | 1306 | static inline pid_t task_tgid_nr(struct task_struct *tsk) |
7af57294 PE |
1307 | { |
1308 | return tsk->tgid; | |
1309 | } | |
1310 | ||
2f2a3a46 | 1311 | pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); |
7af57294 PE |
1312 | |
1313 | static inline pid_t task_tgid_vnr(struct task_struct *tsk) | |
1314 | { | |
1315 | return pid_vnr(task_tgid(tsk)); | |
1316 | } | |
1317 | ||
1318 | ||
e868171a | 1319 | static inline pid_t task_pgrp_nr(struct task_struct *tsk) |
7af57294 | 1320 | { |
9a2e7057 | 1321 | return tsk->signal->__pgrp; |
7af57294 PE |
1322 | } |
1323 | ||
2f2a3a46 | 1324 | pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); |
7af57294 PE |
1325 | |
1326 | static inline pid_t task_pgrp_vnr(struct task_struct *tsk) | |
1327 | { | |
1328 | return pid_vnr(task_pgrp(tsk)); | |
1329 | } | |
1330 | ||
1331 | ||
e868171a | 1332 | static inline pid_t task_session_nr(struct task_struct *tsk) |
7af57294 PE |
1333 | { |
1334 | return tsk->signal->__session; | |
1335 | } | |
1336 | ||
2f2a3a46 | 1337 | pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); |
7af57294 PE |
1338 | |
1339 | static inline pid_t task_session_vnr(struct task_struct *tsk) | |
1340 | { | |
1341 | return pid_vnr(task_session(tsk)); | |
1342 | } | |
1343 | ||
1344 | ||
1da177e4 LT |
1345 | /** |
1346 | * pid_alive - check that a task structure is not stale | |
1347 | * @p: Task structure to be checked. | |
1348 | * | |
1349 | * Test if a process is not yet dead (at most zombie state) | |
1350 | * If pid_alive fails, then pointers within the task structure | |
1351 | * can be stale and must not be dereferenced. | |
1352 | */ | |
e868171a | 1353 | static inline int pid_alive(struct task_struct *p) |
1da177e4 | 1354 | { |
92476d7f | 1355 | return p->pids[PIDTYPE_PID].pid != NULL; |
1da177e4 LT |
1356 | } |
1357 | ||
f400e198 | 1358 | /** |
b460cbc5 | 1359 | * is_global_init - check if a task structure is init |
3260259f HK |
1360 | * @tsk: Task structure to be checked. |
1361 | * | |
1362 | * Check if a task structure is the first user space task the kernel created. | |
b460cbc5 | 1363 | */ |
e868171a | 1364 | static inline int is_global_init(struct task_struct *tsk) |
b461cc03 PE |
1365 | { |
1366 | return tsk->pid == 1; | |
1367 | } | |
b460cbc5 SH |
1368 | |
1369 | /* | |
1370 | * is_container_init: | |
1371 | * check whether in the task is init in its own pid namespace. | |
f400e198 | 1372 | */ |
b461cc03 | 1373 | extern int is_container_init(struct task_struct *tsk); |
f400e198 | 1374 | |
9ec52099 CLG |
1375 | extern struct pid *cad_pid; |
1376 | ||
1da177e4 | 1377 | extern void free_task(struct task_struct *tsk); |
1da177e4 | 1378 | #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) |
e56d0903 | 1379 | |
158d9ebd | 1380 | extern void __put_task_struct(struct task_struct *t); |
e56d0903 IM |
1381 | |
1382 | static inline void put_task_struct(struct task_struct *t) | |
1383 | { | |
1384 | if (atomic_dec_and_test(&t->usage)) | |
8c7904a0 | 1385 | __put_task_struct(t); |
e56d0903 | 1386 | } |
1da177e4 LT |
1387 | |
1388 | /* | |
1389 | * Per process flags | |
1390 | */ | |
1391 | #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */ | |
1392 | /* Not implemented yet, only for 486*/ | |
1393 | #define PF_STARTING 0x00000002 /* being created */ | |
1394 | #define PF_EXITING 0x00000004 /* getting shut down */ | |
778e9a9c | 1395 | #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ |
94886b84 | 1396 | #define PF_VCPU 0x00000010 /* I'm a virtual CPU */ |
1da177e4 LT |
1397 | #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ |
1398 | #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ | |
1399 | #define PF_DUMPCORE 0x00000200 /* dumped core */ | |
1400 | #define PF_SIGNALED 0x00000400 /* killed by a signal */ | |
1401 | #define PF_MEMALLOC 0x00000800 /* Allocating memory */ | |
1402 | #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */ | |
1403 | #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ | |
1da177e4 LT |
1404 | #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ |
1405 | #define PF_FROZEN 0x00010000 /* frozen for system suspend */ | |
1406 | #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ | |
1407 | #define PF_KSWAPD 0x00040000 /* I am kswapd */ | |
1408 | #define PF_SWAPOFF 0x00080000 /* I am in swapoff */ | |
1409 | #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ | |
b31dc66a JA |
1410 | #define PF_BORROWED_MM 0x00200000 /* I am a kthread doing use_mm */ |
1411 | #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ | |
1412 | #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ | |
1413 | #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */ | |
1414 | #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */ | |
c61afb18 | 1415 | #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */ |
61a87122 | 1416 | #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ |
ba96a0c8 | 1417 | #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */ |
1da177e4 LT |
1418 | |
1419 | /* | |
1420 | * Only the _current_ task can read/write to tsk->flags, but other | |
1421 | * tasks can access tsk->flags in readonly mode for example | |
1422 | * with tsk_used_math (like during threaded core dumping). | |
1423 | * There is however an exception to this rule during ptrace | |
1424 | * or during fork: the ptracer task is allowed to write to the | |
1425 | * child->flags of its traced child (same goes for fork, the parent | |
1426 | * can write to the child->flags), because we're guaranteed the | |
1427 | * child is not running and in turn not changing child->flags | |
1428 | * at the same time the parent does it. | |
1429 | */ | |
1430 | #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) | |
1431 | #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) | |
1432 | #define clear_used_math() clear_stopped_child_used_math(current) | |
1433 | #define set_used_math() set_stopped_child_used_math(current) | |
1434 | #define conditional_stopped_child_used_math(condition, child) \ | |
1435 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) | |
1436 | #define conditional_used_math(condition) \ | |
1437 | conditional_stopped_child_used_math(condition, current) | |
1438 | #define copy_to_stopped_child_used_math(child) \ | |
1439 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) | |
1440 | /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ | |
1441 | #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) | |
1442 | #define used_math() tsk_used_math(current) | |
1443 | ||
1444 | #ifdef CONFIG_SMP | |
36c8b586 | 1445 | extern int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask); |
1da177e4 | 1446 | #else |
36c8b586 | 1447 | static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) |
1da177e4 | 1448 | { |
4098f991 | 1449 | if (!cpu_isset(0, new_mask)) |
1da177e4 LT |
1450 | return -EINVAL; |
1451 | return 0; | |
1452 | } | |
1453 | #endif | |
1454 | ||
1455 | extern unsigned long long sched_clock(void); | |
e436d800 IM |
1456 | |
1457 | /* | |
1458 | * For kernel-internal use: high-speed (but slightly incorrect) per-cpu | |
1459 | * clock constructed from sched_clock(): | |
1460 | */ | |
1461 | extern unsigned long long cpu_clock(int cpu); | |
1462 | ||
36c8b586 | 1463 | extern unsigned long long |
41b86e9c | 1464 | task_sched_runtime(struct task_struct *task); |
1da177e4 LT |
1465 | |
1466 | /* sched_exec is called by processes performing an exec */ | |
1467 | #ifdef CONFIG_SMP | |
1468 | extern void sched_exec(void); | |
1469 | #else | |
1470 | #define sched_exec() {} | |
1471 | #endif | |
1472 | ||
2aa44d05 IM |
1473 | extern void sched_clock_idle_sleep_event(void); |
1474 | extern void sched_clock_idle_wakeup_event(u64 delta_ns); | |
bb29ab26 | 1475 | |
1da177e4 LT |
1476 | #ifdef CONFIG_HOTPLUG_CPU |
1477 | extern void idle_task_exit(void); | |
1478 | #else | |
1479 | static inline void idle_task_exit(void) {} | |
1480 | #endif | |
1481 | ||
1482 | extern void sched_idle_next(void); | |
b29739f9 | 1483 | |
2bd8e6d4 | 1484 | #ifdef CONFIG_SCHED_DEBUG |
21805085 | 1485 | extern unsigned int sysctl_sched_latency; |
b2be5e96 | 1486 | extern unsigned int sysctl_sched_min_granularity; |
bf0f6f24 IM |
1487 | extern unsigned int sysctl_sched_wakeup_granularity; |
1488 | extern unsigned int sysctl_sched_batch_wakeup_granularity; | |
bf0f6f24 IM |
1489 | extern unsigned int sysctl_sched_child_runs_first; |
1490 | extern unsigned int sysctl_sched_features; | |
da84d961 | 1491 | extern unsigned int sysctl_sched_migration_cost; |
b82d9fdd | 1492 | extern unsigned int sysctl_sched_nr_migrate; |
fa85ae24 PZ |
1493 | extern unsigned int sysctl_sched_rt_period; |
1494 | extern unsigned int sysctl_sched_rt_ratio; | |
6b2d7700 SV |
1495 | #if defined(CONFIG_FAIR_GROUP_SCHED) && defined(CONFIG_SMP) |
1496 | extern unsigned int sysctl_sched_min_bal_int_shares; | |
1497 | extern unsigned int sysctl_sched_max_bal_int_shares; | |
1498 | #endif | |
b2be5e96 PZ |
1499 | |
1500 | int sched_nr_latency_handler(struct ctl_table *table, int write, | |
1501 | struct file *file, void __user *buffer, size_t *length, | |
1502 | loff_t *ppos); | |
2bd8e6d4 IM |
1503 | #endif |
1504 | ||
1505 | extern unsigned int sysctl_sched_compat_yield; | |
bf0f6f24 | 1506 | |
b29739f9 | 1507 | #ifdef CONFIG_RT_MUTEXES |
36c8b586 IM |
1508 | extern int rt_mutex_getprio(struct task_struct *p); |
1509 | extern void rt_mutex_setprio(struct task_struct *p, int prio); | |
1510 | extern void rt_mutex_adjust_pi(struct task_struct *p); | |
b29739f9 | 1511 | #else |
e868171a | 1512 | static inline int rt_mutex_getprio(struct task_struct *p) |
b29739f9 IM |
1513 | { |
1514 | return p->normal_prio; | |
1515 | } | |
95e02ca9 | 1516 | # define rt_mutex_adjust_pi(p) do { } while (0) |
b29739f9 IM |
1517 | #endif |
1518 | ||
36c8b586 IM |
1519 | extern void set_user_nice(struct task_struct *p, long nice); |
1520 | extern int task_prio(const struct task_struct *p); | |
1521 | extern int task_nice(const struct task_struct *p); | |
1522 | extern int can_nice(const struct task_struct *p, const int nice); | |
1523 | extern int task_curr(const struct task_struct *p); | |
1da177e4 LT |
1524 | extern int idle_cpu(int cpu); |
1525 | extern int sched_setscheduler(struct task_struct *, int, struct sched_param *); | |
36c8b586 IM |
1526 | extern struct task_struct *idle_task(int cpu); |
1527 | extern struct task_struct *curr_task(int cpu); | |
1528 | extern void set_curr_task(int cpu, struct task_struct *p); | |
1da177e4 LT |
1529 | |
1530 | void yield(void); | |
1531 | ||
1532 | /* | |
1533 | * The default (Linux) execution domain. | |
1534 | */ | |
1535 | extern struct exec_domain default_exec_domain; | |
1536 | ||
1537 | union thread_union { | |
1538 | struct thread_info thread_info; | |
1539 | unsigned long stack[THREAD_SIZE/sizeof(long)]; | |
1540 | }; | |
1541 | ||
1542 | #ifndef __HAVE_ARCH_KSTACK_END | |
1543 | static inline int kstack_end(void *addr) | |
1544 | { | |
1545 | /* Reliable end of stack detection: | |
1546 | * Some APM bios versions misalign the stack | |
1547 | */ | |
1548 | return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); | |
1549 | } | |
1550 | #endif | |
1551 | ||
1552 | extern union thread_union init_thread_union; | |
1553 | extern struct task_struct init_task; | |
1554 | ||
1555 | extern struct mm_struct init_mm; | |
1556 | ||
198fe21b PE |
1557 | extern struct pid_namespace init_pid_ns; |
1558 | ||
1559 | /* | |
1560 | * find a task by one of its numerical ids | |
1561 | * | |
1562 | * find_task_by_pid_type_ns(): | |
1563 | * it is the most generic call - it finds a task by all id, | |
1564 | * type and namespace specified | |
1565 | * find_task_by_pid_ns(): | |
1566 | * finds a task by its pid in the specified namespace | |
228ebcbe PE |
1567 | * find_task_by_vpid(): |
1568 | * finds a task by its virtual pid | |
198fe21b PE |
1569 | * find_task_by_pid(): |
1570 | * finds a task by its global pid | |
1571 | * | |
1572 | * see also find_pid() etc in include/linux/pid.h | |
1573 | */ | |
1574 | ||
1575 | extern struct task_struct *find_task_by_pid_type_ns(int type, int pid, | |
1576 | struct pid_namespace *ns); | |
1577 | ||
228ebcbe PE |
1578 | extern struct task_struct *find_task_by_pid(pid_t nr); |
1579 | extern struct task_struct *find_task_by_vpid(pid_t nr); | |
1580 | extern struct task_struct *find_task_by_pid_ns(pid_t nr, | |
1581 | struct pid_namespace *ns); | |
198fe21b | 1582 | |
1da177e4 LT |
1583 | extern void __set_special_pids(pid_t session, pid_t pgrp); |
1584 | ||
1585 | /* per-UID process charging. */ | |
acce292c | 1586 | extern struct user_struct * alloc_uid(struct user_namespace *, uid_t); |
1da177e4 LT |
1587 | static inline struct user_struct *get_uid(struct user_struct *u) |
1588 | { | |
1589 | atomic_inc(&u->__count); | |
1590 | return u; | |
1591 | } | |
1592 | extern void free_uid(struct user_struct *); | |
1593 | extern void switch_uid(struct user_struct *); | |
28f300d2 | 1594 | extern void release_uids(struct user_namespace *ns); |
1da177e4 LT |
1595 | |
1596 | #include <asm/current.h> | |
1597 | ||
3171a030 | 1598 | extern void do_timer(unsigned long ticks); |
1da177e4 LT |
1599 | |
1600 | extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state)); | |
1601 | extern int FASTCALL(wake_up_process(struct task_struct * tsk)); | |
1602 | extern void FASTCALL(wake_up_new_task(struct task_struct * tsk, | |
1603 | unsigned long clone_flags)); | |
1604 | #ifdef CONFIG_SMP | |
1605 | extern void kick_process(struct task_struct *tsk); | |
1606 | #else | |
1607 | static inline void kick_process(struct task_struct *tsk) { } | |
1608 | #endif | |
ad46c2c4 IM |
1609 | extern void sched_fork(struct task_struct *p, int clone_flags); |
1610 | extern void sched_dead(struct task_struct *p); | |
1da177e4 LT |
1611 | |
1612 | extern int in_group_p(gid_t); | |
1613 | extern int in_egroup_p(gid_t); | |
1614 | ||
1615 | extern void proc_caches_init(void); | |
1616 | extern void flush_signals(struct task_struct *); | |
10ab825b | 1617 | extern void ignore_signals(struct task_struct *); |
1da177e4 LT |
1618 | extern void flush_signal_handlers(struct task_struct *, int force_default); |
1619 | extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); | |
1620 | ||
1621 | static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) | |
1622 | { | |
1623 | unsigned long flags; | |
1624 | int ret; | |
1625 | ||
1626 | spin_lock_irqsave(&tsk->sighand->siglock, flags); | |
1627 | ret = dequeue_signal(tsk, mask, info); | |
1628 | spin_unlock_irqrestore(&tsk->sighand->siglock, flags); | |
1629 | ||
1630 | return ret; | |
1631 | } | |
1632 | ||
1633 | extern void block_all_signals(int (*notifier)(void *priv), void *priv, | |
1634 | sigset_t *mask); | |
1635 | extern void unblock_all_signals(void); | |
1636 | extern void release_task(struct task_struct * p); | |
1637 | extern int send_sig_info(int, struct siginfo *, struct task_struct *); | |
1638 | extern int send_group_sig_info(int, struct siginfo *, struct task_struct *); | |
1639 | extern int force_sigsegv(int, struct task_struct *); | |
1640 | extern int force_sig_info(int, struct siginfo *, struct task_struct *); | |
c4b92fc1 EB |
1641 | extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); |
1642 | extern int kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); | |
1643 | extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid); | |
2425c08b | 1644 | extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32); |
c4b92fc1 EB |
1645 | extern int kill_pgrp(struct pid *pid, int sig, int priv); |
1646 | extern int kill_pid(struct pid *pid, int sig, int priv); | |
c3de4b38 | 1647 | extern int kill_proc_info(int, struct siginfo *, pid_t); |
1da177e4 LT |
1648 | extern void do_notify_parent(struct task_struct *, int); |
1649 | extern void force_sig(int, struct task_struct *); | |
1650 | extern void force_sig_specific(int, struct task_struct *); | |
1651 | extern int send_sig(int, struct task_struct *, int); | |
1652 | extern void zap_other_threads(struct task_struct *p); | |
1da177e4 LT |
1653 | extern int kill_proc(pid_t, int, int); |
1654 | extern struct sigqueue *sigqueue_alloc(void); | |
1655 | extern void sigqueue_free(struct sigqueue *); | |
1656 | extern int send_sigqueue(int, struct sigqueue *, struct task_struct *); | |
1657 | extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *); | |
9ac95f2f | 1658 | extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); |
1da177e4 LT |
1659 | extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); |
1660 | ||
9ec52099 CLG |
1661 | static inline int kill_cad_pid(int sig, int priv) |
1662 | { | |
1663 | return kill_pid(cad_pid, sig, priv); | |
1664 | } | |
1665 | ||
1da177e4 LT |
1666 | /* These can be the second arg to send_sig_info/send_group_sig_info. */ |
1667 | #define SEND_SIG_NOINFO ((struct siginfo *) 0) | |
1668 | #define SEND_SIG_PRIV ((struct siginfo *) 1) | |
1669 | #define SEND_SIG_FORCED ((struct siginfo *) 2) | |
1670 | ||
621d3121 ON |
1671 | static inline int is_si_special(const struct siginfo *info) |
1672 | { | |
1673 | return info <= SEND_SIG_FORCED; | |
1674 | } | |
1675 | ||
1da177e4 LT |
1676 | /* True if we are on the alternate signal stack. */ |
1677 | ||
1678 | static inline int on_sig_stack(unsigned long sp) | |
1679 | { | |
1680 | return (sp - current->sas_ss_sp < current->sas_ss_size); | |
1681 | } | |
1682 | ||
1683 | static inline int sas_ss_flags(unsigned long sp) | |
1684 | { | |
1685 | return (current->sas_ss_size == 0 ? SS_DISABLE | |
1686 | : on_sig_stack(sp) ? SS_ONSTACK : 0); | |
1687 | } | |
1688 | ||
1da177e4 LT |
1689 | /* |
1690 | * Routines for handling mm_structs | |
1691 | */ | |
1692 | extern struct mm_struct * mm_alloc(void); | |
1693 | ||
1694 | /* mmdrop drops the mm and the page tables */ | |
1695 | extern void FASTCALL(__mmdrop(struct mm_struct *)); | |
1696 | static inline void mmdrop(struct mm_struct * mm) | |
1697 | { | |
6fb43d7b | 1698 | if (unlikely(atomic_dec_and_test(&mm->mm_count))) |
1da177e4 LT |
1699 | __mmdrop(mm); |
1700 | } | |
1701 | ||
1702 | /* mmput gets rid of the mappings and all user-space */ | |
1703 | extern void mmput(struct mm_struct *); | |
1704 | /* Grab a reference to a task's mm, if it is not already going away */ | |
1705 | extern struct mm_struct *get_task_mm(struct task_struct *task); | |
1706 | /* Remove the current tasks stale references to the old mm_struct */ | |
1707 | extern void mm_release(struct task_struct *, struct mm_struct *); | |
1708 | ||
1709 | extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *); | |
1710 | extern void flush_thread(void); | |
1711 | extern void exit_thread(void); | |
1712 | ||
1da177e4 | 1713 | extern void exit_files(struct task_struct *); |
6b3934ef | 1714 | extern void __cleanup_signal(struct signal_struct *); |
a7e5328a | 1715 | extern void __cleanup_sighand(struct sighand_struct *); |
1da177e4 LT |
1716 | extern void exit_itimers(struct signal_struct *); |
1717 | ||
1718 | extern NORET_TYPE void do_group_exit(int); | |
1719 | ||
1da177e4 LT |
1720 | extern void daemonize(const char *, ...); |
1721 | extern int allow_signal(int); | |
1722 | extern int disallow_signal(int); | |
1da177e4 LT |
1723 | |
1724 | extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *); | |
1725 | extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *); | |
36c8b586 | 1726 | struct task_struct *fork_idle(int); |
1da177e4 LT |
1727 | |
1728 | extern void set_task_comm(struct task_struct *tsk, char *from); | |
1729 | extern void get_task_comm(char *to, struct task_struct *tsk); | |
1730 | ||
1731 | #ifdef CONFIG_SMP | |
36c8b586 | 1732 | extern void wait_task_inactive(struct task_struct * p); |
1da177e4 LT |
1733 | #else |
1734 | #define wait_task_inactive(p) do { } while (0) | |
1735 | #endif | |
1736 | ||
1737 | #define remove_parent(p) list_del_init(&(p)->sibling) | |
8fafabd8 | 1738 | #define add_parent(p) list_add_tail(&(p)->sibling,&(p)->parent->children) |
1da177e4 | 1739 | |
5e85d4ab | 1740 | #define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks) |
1da177e4 LT |
1741 | |
1742 | #define for_each_process(p) \ | |
1743 | for (p = &init_task ; (p = next_task(p)) != &init_task ; ) | |
1744 | ||
1745 | /* | |
1746 | * Careful: do_each_thread/while_each_thread is a double loop so | |
1747 | * 'break' will not work as expected - use goto instead. | |
1748 | */ | |
1749 | #define do_each_thread(g, t) \ | |
1750 | for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do | |
1751 | ||
1752 | #define while_each_thread(g, t) \ | |
1753 | while ((t = next_thread(t)) != g) | |
1754 | ||
de12a787 EB |
1755 | /* de_thread depends on thread_group_leader not being a pid based check */ |
1756 | #define thread_group_leader(p) (p == p->group_leader) | |
1da177e4 | 1757 | |
0804ef4b EB |
1758 | /* Do to the insanities of de_thread it is possible for a process |
1759 | * to have the pid of the thread group leader without actually being | |
1760 | * the thread group leader. For iteration through the pids in proc | |
1761 | * all we care about is that we have a task with the appropriate | |
1762 | * pid, we don't actually care if we have the right task. | |
1763 | */ | |
e868171a | 1764 | static inline int has_group_leader_pid(struct task_struct *p) |
0804ef4b EB |
1765 | { |
1766 | return p->pid == p->tgid; | |
1767 | } | |
1768 | ||
bac0abd6 PE |
1769 | static inline |
1770 | int same_thread_group(struct task_struct *p1, struct task_struct *p2) | |
1771 | { | |
1772 | return p1->tgid == p2->tgid; | |
1773 | } | |
1774 | ||
36c8b586 | 1775 | static inline struct task_struct *next_thread(const struct task_struct *p) |
47e65328 ON |
1776 | { |
1777 | return list_entry(rcu_dereference(p->thread_group.next), | |
36c8b586 | 1778 | struct task_struct, thread_group); |
47e65328 ON |
1779 | } |
1780 | ||
e868171a | 1781 | static inline int thread_group_empty(struct task_struct *p) |
1da177e4 | 1782 | { |
47e65328 | 1783 | return list_empty(&p->thread_group); |
1da177e4 LT |
1784 | } |
1785 | ||
1786 | #define delay_group_leader(p) \ | |
1787 | (thread_group_leader(p) && !thread_group_empty(p)) | |
1788 | ||
1da177e4 | 1789 | /* |
260ea101 | 1790 | * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring |
22e2c507 | 1791 | * subscriptions and synchronises with wait4(). Also used in procfs. Also |
ddbcc7e8 PM |
1792 | * pins the final release of task.io_context. Also protects ->cpuset and |
1793 | * ->cgroup.subsys[]. | |
1da177e4 LT |
1794 | * |
1795 | * Nests both inside and outside of read_lock(&tasklist_lock). | |
1796 | * It must not be nested with write_lock_irq(&tasklist_lock), | |
1797 | * neither inside nor outside. | |
1798 | */ | |
1799 | static inline void task_lock(struct task_struct *p) | |
1800 | { | |
1801 | spin_lock(&p->alloc_lock); | |
1802 | } | |
1803 | ||
1804 | static inline void task_unlock(struct task_struct *p) | |
1805 | { | |
1806 | spin_unlock(&p->alloc_lock); | |
1807 | } | |
1808 | ||
f63ee72e ON |
1809 | extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk, |
1810 | unsigned long *flags); | |
1811 | ||
1812 | static inline void unlock_task_sighand(struct task_struct *tsk, | |
1813 | unsigned long *flags) | |
1814 | { | |
1815 | spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); | |
1816 | } | |
1817 | ||
f037360f AV |
1818 | #ifndef __HAVE_THREAD_FUNCTIONS |
1819 | ||
f7e4217b RZ |
1820 | #define task_thread_info(task) ((struct thread_info *)(task)->stack) |
1821 | #define task_stack_page(task) ((task)->stack) | |
a1261f54 | 1822 | |
10ebffde AV |
1823 | static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) |
1824 | { | |
1825 | *task_thread_info(p) = *task_thread_info(org); | |
1826 | task_thread_info(p)->task = p; | |
1827 | } | |
1828 | ||
1829 | static inline unsigned long *end_of_stack(struct task_struct *p) | |
1830 | { | |
f7e4217b | 1831 | return (unsigned long *)(task_thread_info(p) + 1); |
10ebffde AV |
1832 | } |
1833 | ||
f037360f AV |
1834 | #endif |
1835 | ||
1da177e4 LT |
1836 | /* set thread flags in other task's structures |
1837 | * - see asm/thread_info.h for TIF_xxxx flags available | |
1838 | */ | |
1839 | static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1840 | { | |
a1261f54 | 1841 | set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1842 | } |
1843 | ||
1844 | static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1845 | { | |
a1261f54 | 1846 | clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1847 | } |
1848 | ||
1849 | static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1850 | { | |
a1261f54 | 1851 | return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1852 | } |
1853 | ||
1854 | static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1855 | { | |
a1261f54 | 1856 | return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1857 | } |
1858 | ||
1859 | static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1860 | { | |
a1261f54 | 1861 | return test_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1862 | } |
1863 | ||
1864 | static inline void set_tsk_need_resched(struct task_struct *tsk) | |
1865 | { | |
1866 | set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
1867 | } | |
1868 | ||
1869 | static inline void clear_tsk_need_resched(struct task_struct *tsk) | |
1870 | { | |
1871 | clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
1872 | } | |
1873 | ||
1874 | static inline int signal_pending(struct task_struct *p) | |
1875 | { | |
1876 | return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); | |
1877 | } | |
1878 | ||
1879 | static inline int need_resched(void) | |
1880 | { | |
1881 | return unlikely(test_thread_flag(TIF_NEED_RESCHED)); | |
1882 | } | |
1883 | ||
1884 | /* | |
1885 | * cond_resched() and cond_resched_lock(): latency reduction via | |
1886 | * explicit rescheduling in places that are safe. The return | |
1887 | * value indicates whether a reschedule was done in fact. | |
1888 | * cond_resched_lock() will drop the spinlock before scheduling, | |
1889 | * cond_resched_softirq() will enable bhs before scheduling. | |
1890 | */ | |
02b67cc3 HX |
1891 | #ifdef CONFIG_PREEMPT |
1892 | static inline int cond_resched(void) | |
1893 | { | |
1894 | return 0; | |
1895 | } | |
1896 | #else | |
1897 | extern int _cond_resched(void); | |
1898 | static inline int cond_resched(void) | |
1899 | { | |
1900 | return _cond_resched(); | |
1901 | } | |
1902 | #endif | |
1da177e4 LT |
1903 | extern int cond_resched_lock(spinlock_t * lock); |
1904 | extern int cond_resched_softirq(void); | |
1905 | ||
1906 | /* | |
1907 | * Does a critical section need to be broken due to another | |
1908 | * task waiting?: | |
1909 | */ | |
1910 | #if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP) | |
1911 | # define need_lockbreak(lock) ((lock)->break_lock) | |
1912 | #else | |
1913 | # define need_lockbreak(lock) 0 | |
1914 | #endif | |
1915 | ||
1916 | /* | |
1917 | * Does a critical section need to be broken due to another | |
1918 | * task waiting or preemption being signalled: | |
1919 | */ | |
1920 | static inline int lock_need_resched(spinlock_t *lock) | |
1921 | { | |
1922 | if (need_lockbreak(lock) || need_resched()) | |
1923 | return 1; | |
1924 | return 0; | |
1925 | } | |
1926 | ||
7bb44ade RM |
1927 | /* |
1928 | * Reevaluate whether the task has signals pending delivery. | |
1929 | * Wake the task if so. | |
1930 | * This is required every time the blocked sigset_t changes. | |
1931 | * callers must hold sighand->siglock. | |
1932 | */ | |
1933 | extern void recalc_sigpending_and_wake(struct task_struct *t); | |
1da177e4 LT |
1934 | extern void recalc_sigpending(void); |
1935 | ||
1936 | extern void signal_wake_up(struct task_struct *t, int resume_stopped); | |
1937 | ||
1938 | /* | |
1939 | * Wrappers for p->thread_info->cpu access. No-op on UP. | |
1940 | */ | |
1941 | #ifdef CONFIG_SMP | |
1942 | ||
1943 | static inline unsigned int task_cpu(const struct task_struct *p) | |
1944 | { | |
a1261f54 | 1945 | return task_thread_info(p)->cpu; |
1da177e4 LT |
1946 | } |
1947 | ||
c65cc870 | 1948 | extern void set_task_cpu(struct task_struct *p, unsigned int cpu); |
1da177e4 LT |
1949 | |
1950 | #else | |
1951 | ||
1952 | static inline unsigned int task_cpu(const struct task_struct *p) | |
1953 | { | |
1954 | return 0; | |
1955 | } | |
1956 | ||
1957 | static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) | |
1958 | { | |
1959 | } | |
1960 | ||
1961 | #endif /* CONFIG_SMP */ | |
1962 | ||
1963 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
1964 | extern void arch_pick_mmap_layout(struct mm_struct *mm); | |
1965 | #else | |
1966 | static inline void arch_pick_mmap_layout(struct mm_struct *mm) | |
1967 | { | |
1968 | mm->mmap_base = TASK_UNMAPPED_BASE; | |
1969 | mm->get_unmapped_area = arch_get_unmapped_area; | |
1970 | mm->unmap_area = arch_unmap_area; | |
1971 | } | |
1972 | #endif | |
1973 | ||
1974 | extern long sched_setaffinity(pid_t pid, cpumask_t new_mask); | |
1975 | extern long sched_getaffinity(pid_t pid, cpumask_t *mask); | |
1976 | ||
5c45bf27 | 1977 | extern int sched_mc_power_savings, sched_smt_power_savings; |
5c45bf27 | 1978 | |
1da177e4 LT |
1979 | extern void normalize_rt_tasks(void); |
1980 | ||
9b5b7751 SV |
1981 | #ifdef CONFIG_FAIR_GROUP_SCHED |
1982 | ||
4cf86d77 | 1983 | extern struct task_group init_task_group; |
9b5b7751 | 1984 | |
4cf86d77 IM |
1985 | extern struct task_group *sched_create_group(void); |
1986 | extern void sched_destroy_group(struct task_group *tg); | |
9b5b7751 | 1987 | extern void sched_move_task(struct task_struct *tsk); |
4cf86d77 | 1988 | extern int sched_group_set_shares(struct task_group *tg, unsigned long shares); |
5cb350ba | 1989 | extern unsigned long sched_group_shares(struct task_group *tg); |
9b5b7751 SV |
1990 | |
1991 | #endif | |
1992 | ||
4b98d11b AD |
1993 | #ifdef CONFIG_TASK_XACCT |
1994 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) | |
1995 | { | |
1996 | tsk->rchar += amt; | |
1997 | } | |
1998 | ||
1999 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) | |
2000 | { | |
2001 | tsk->wchar += amt; | |
2002 | } | |
2003 | ||
2004 | static inline void inc_syscr(struct task_struct *tsk) | |
2005 | { | |
2006 | tsk->syscr++; | |
2007 | } | |
2008 | ||
2009 | static inline void inc_syscw(struct task_struct *tsk) | |
2010 | { | |
2011 | tsk->syscw++; | |
2012 | } | |
2013 | #else | |
2014 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) | |
2015 | { | |
2016 | } | |
2017 | ||
2018 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) | |
2019 | { | |
2020 | } | |
2021 | ||
2022 | static inline void inc_syscr(struct task_struct *tsk) | |
2023 | { | |
2024 | } | |
2025 | ||
2026 | static inline void inc_syscw(struct task_struct *tsk) | |
2027 | { | |
2028 | } | |
2029 | #endif | |
2030 | ||
e6fe6649 AB |
2031 | #ifdef CONFIG_SMP |
2032 | void migration_init(void); | |
2033 | #else | |
2034 | static inline void migration_init(void) | |
2035 | { | |
2036 | } | |
2037 | #endif | |
2038 | ||
1da177e4 LT |
2039 | #endif /* __KERNEL__ */ |
2040 | ||
2041 | #endif |