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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 */ |
fadad878 | 30 | #define CLONE_IO 0x80000000 /* Clone io context */ |
b7b3c76a DW |
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 | |
0e6aca43 IM |
39 | /* SCHED_ISO: reserved but not implemented yet */ |
40 | #define SCHED_IDLE 5 | |
b7b3c76a | 41 | |
a3b6714e | 42 | #ifdef __KERNEL__ |
b7b3c76a DW |
43 | |
44 | struct sched_param { | |
45 | int sched_priority; | |
46 | }; | |
47 | ||
1da177e4 LT |
48 | #include <asm/param.h> /* for HZ */ |
49 | ||
1da177e4 LT |
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> | |
c92ff1bd | 61 | #include <linux/mm_types.h> |
1da177e4 LT |
62 | |
63 | #include <asm/system.h> | |
64 | #include <asm/semaphore.h> | |
65 | #include <asm/page.h> | |
66 | #include <asm/ptrace.h> | |
1da177e4 LT |
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> | |
3e26c149 | 79 | #include <linux/proportions.h> |
1da177e4 | 80 | #include <linux/seccomp.h> |
e56d0903 | 81 | #include <linux/rcupdate.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> |
9745512c | 91 | #include <linux/latencytop.h> |
a3b6714e DW |
92 | |
93 | #include <asm/processor.h> | |
36d57ac4 | 94 | |
1da177e4 | 95 | struct exec_domain; |
c87e2837 | 96 | struct futex_pi_state; |
286100a6 | 97 | struct robust_list_head; |
d89d8796 | 98 | struct bio; |
1da177e4 | 99 | |
1da177e4 LT |
100 | /* |
101 | * List of flags we want to share for kernel threads, | |
102 | * if only because they are not used by them anyway. | |
103 | */ | |
104 | #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND) | |
105 | ||
106 | /* | |
107 | * These are the constant used to fake the fixed-point load-average | |
108 | * counting. Some notes: | |
109 | * - 11 bit fractions expand to 22 bits by the multiplies: this gives | |
110 | * a load-average precision of 10 bits integer + 11 bits fractional | |
111 | * - if you want to count load-averages more often, you need more | |
112 | * precision, or rounding will get you. With 2-second counting freq, | |
113 | * the EXP_n values would be 1981, 2034 and 2043 if still using only | |
114 | * 11 bit fractions. | |
115 | */ | |
116 | extern unsigned long avenrun[]; /* Load averages */ | |
117 | ||
118 | #define FSHIFT 11 /* nr of bits of precision */ | |
119 | #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ | |
0c2043ab | 120 | #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */ |
1da177e4 LT |
121 | #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ |
122 | #define EXP_5 2014 /* 1/exp(5sec/5min) */ | |
123 | #define EXP_15 2037 /* 1/exp(5sec/15min) */ | |
124 | ||
125 | #define CALC_LOAD(load,exp,n) \ | |
126 | load *= exp; \ | |
127 | load += n*(FIXED_1-exp); \ | |
128 | load >>= FSHIFT; | |
129 | ||
130 | extern unsigned long total_forks; | |
131 | extern int nr_threads; | |
1da177e4 LT |
132 | DECLARE_PER_CPU(unsigned long, process_counts); |
133 | extern int nr_processes(void); | |
134 | extern unsigned long nr_running(void); | |
135 | extern unsigned long nr_uninterruptible(void); | |
db1b1fef | 136 | extern unsigned long nr_active(void); |
1da177e4 | 137 | extern unsigned long nr_iowait(void); |
2dd73a4f | 138 | extern unsigned long weighted_cpuload(const int cpu); |
1da177e4 | 139 | |
43ae34cb IM |
140 | struct seq_file; |
141 | struct cfs_rq; | |
4cf86d77 | 142 | struct task_group; |
43ae34cb IM |
143 | #ifdef CONFIG_SCHED_DEBUG |
144 | extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m); | |
145 | extern void proc_sched_set_task(struct task_struct *p); | |
146 | extern void | |
5cef9eca | 147 | print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq); |
43ae34cb IM |
148 | #else |
149 | static inline void | |
150 | proc_sched_show_task(struct task_struct *p, struct seq_file *m) | |
151 | { | |
152 | } | |
153 | static inline void proc_sched_set_task(struct task_struct *p) | |
154 | { | |
155 | } | |
156 | static inline void | |
5cef9eca | 157 | print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) |
43ae34cb IM |
158 | { |
159 | } | |
160 | #endif | |
1da177e4 | 161 | |
4a8342d2 LT |
162 | /* |
163 | * Task state bitmask. NOTE! These bits are also | |
164 | * encoded in fs/proc/array.c: get_task_state(). | |
165 | * | |
166 | * We have two separate sets of flags: task->state | |
167 | * is about runnability, while task->exit_state are | |
168 | * about the task exiting. Confusing, but this way | |
169 | * modifying one set can't modify the other one by | |
170 | * mistake. | |
171 | */ | |
1da177e4 LT |
172 | #define TASK_RUNNING 0 |
173 | #define TASK_INTERRUPTIBLE 1 | |
174 | #define TASK_UNINTERRUPTIBLE 2 | |
f021a3c2 MW |
175 | #define __TASK_STOPPED 4 |
176 | #define __TASK_TRACED 8 | |
4a8342d2 LT |
177 | /* in tsk->exit_state */ |
178 | #define EXIT_ZOMBIE 16 | |
179 | #define EXIT_DEAD 32 | |
180 | /* in tsk->state again */ | |
af927232 | 181 | #define TASK_DEAD 64 |
f021a3c2 MW |
182 | #define TASK_WAKEKILL 128 |
183 | ||
184 | /* Convenience macros for the sake of set_task_state */ | |
185 | #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE) | |
186 | #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED) | |
187 | #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED) | |
1da177e4 | 188 | |
92a1f4bc MW |
189 | /* Convenience macros for the sake of wake_up */ |
190 | #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) | |
f021a3c2 | 191 | #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED) |
92a1f4bc MW |
192 | |
193 | /* get_task_state() */ | |
194 | #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \ | |
f021a3c2 MW |
195 | TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ |
196 | __TASK_TRACED) | |
92a1f4bc | 197 | |
f021a3c2 MW |
198 | #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0) |
199 | #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0) | |
92a1f4bc | 200 | #define task_is_stopped_or_traced(task) \ |
f021a3c2 | 201 | ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0) |
92a1f4bc MW |
202 | #define task_contributes_to_load(task) \ |
203 | ((task->state & TASK_UNINTERRUPTIBLE) != 0) | |
1da177e4 LT |
204 | |
205 | #define __set_task_state(tsk, state_value) \ | |
206 | do { (tsk)->state = (state_value); } while (0) | |
207 | #define set_task_state(tsk, state_value) \ | |
208 | set_mb((tsk)->state, (state_value)) | |
209 | ||
498d0c57 AM |
210 | /* |
211 | * set_current_state() includes a barrier so that the write of current->state | |
212 | * is correctly serialised wrt the caller's subsequent test of whether to | |
213 | * actually sleep: | |
214 | * | |
215 | * set_current_state(TASK_UNINTERRUPTIBLE); | |
216 | * if (do_i_need_to_sleep()) | |
217 | * schedule(); | |
218 | * | |
219 | * If the caller does not need such serialisation then use __set_current_state() | |
220 | */ | |
1da177e4 LT |
221 | #define __set_current_state(state_value) \ |
222 | do { current->state = (state_value); } while (0) | |
223 | #define set_current_state(state_value) \ | |
224 | set_mb(current->state, (state_value)) | |
225 | ||
226 | /* Task command name length */ | |
227 | #define TASK_COMM_LEN 16 | |
228 | ||
1da177e4 LT |
229 | #include <linux/spinlock.h> |
230 | ||
231 | /* | |
232 | * This serializes "schedule()" and also protects | |
233 | * the run-queue from deletions/modifications (but | |
234 | * _adding_ to the beginning of the run-queue has | |
235 | * a separate lock). | |
236 | */ | |
237 | extern rwlock_t tasklist_lock; | |
238 | extern spinlock_t mmlist_lock; | |
239 | ||
36c8b586 | 240 | struct task_struct; |
1da177e4 LT |
241 | |
242 | extern void sched_init(void); | |
243 | extern void sched_init_smp(void); | |
36c8b586 | 244 | extern void init_idle(struct task_struct *idle, int cpu); |
1df21055 | 245 | extern void init_idle_bootup_task(struct task_struct *idle); |
1da177e4 LT |
246 | |
247 | extern cpumask_t nohz_cpu_mask; | |
46cb4b7c SS |
248 | #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ) |
249 | extern int select_nohz_load_balancer(int cpu); | |
250 | #else | |
251 | static inline int select_nohz_load_balancer(int cpu) | |
252 | { | |
253 | return 0; | |
254 | } | |
255 | #endif | |
1da177e4 | 256 | |
48d5e258 PZ |
257 | extern unsigned long rt_needs_cpu(int cpu); |
258 | ||
e59e2ae2 | 259 | /* |
39bc89fd | 260 | * Only dump TASK_* tasks. (0 for all tasks) |
e59e2ae2 IM |
261 | */ |
262 | extern void show_state_filter(unsigned long state_filter); | |
263 | ||
264 | static inline void show_state(void) | |
265 | { | |
39bc89fd | 266 | show_state_filter(0); |
e59e2ae2 IM |
267 | } |
268 | ||
1da177e4 LT |
269 | extern void show_regs(struct pt_regs *); |
270 | ||
271 | /* | |
272 | * TASK is a pointer to the task whose backtrace we want to see (or NULL for current | |
273 | * task), SP is the stack pointer of the first frame that should be shown in the back | |
274 | * trace (or NULL if the entire call-chain of the task should be shown). | |
275 | */ | |
276 | extern void show_stack(struct task_struct *task, unsigned long *sp); | |
277 | ||
278 | void io_schedule(void); | |
279 | long io_schedule_timeout(long timeout); | |
280 | ||
281 | extern void cpu_init (void); | |
282 | extern void trap_init(void); | |
fa13a5a1 | 283 | extern void account_process_tick(struct task_struct *task, int user); |
1da177e4 LT |
284 | extern void update_process_times(int user); |
285 | extern void scheduler_tick(void); | |
8f4d37ec | 286 | extern void hrtick_resched(void); |
1da177e4 | 287 | |
82a1fcb9 IM |
288 | extern void sched_show_task(struct task_struct *p); |
289 | ||
8446f1d3 | 290 | #ifdef CONFIG_DETECT_SOFTLOCKUP |
6687a97d | 291 | extern void softlockup_tick(void); |
8446f1d3 IM |
292 | extern void spawn_softlockup_task(void); |
293 | extern void touch_softlockup_watchdog(void); | |
04c9167f | 294 | extern void touch_all_softlockup_watchdogs(void); |
90739081 | 295 | extern unsigned long softlockup_thresh; |
82a1fcb9 IM |
296 | extern unsigned long sysctl_hung_task_check_count; |
297 | extern unsigned long sysctl_hung_task_timeout_secs; | |
90739081 | 298 | extern unsigned long sysctl_hung_task_warnings; |
8446f1d3 | 299 | #else |
6687a97d | 300 | static inline void softlockup_tick(void) |
8446f1d3 IM |
301 | { |
302 | } | |
303 | static inline void spawn_softlockup_task(void) | |
304 | { | |
305 | } | |
306 | static inline void touch_softlockup_watchdog(void) | |
307 | { | |
308 | } | |
04c9167f JF |
309 | static inline void touch_all_softlockup_watchdogs(void) |
310 | { | |
311 | } | |
8446f1d3 IM |
312 | #endif |
313 | ||
314 | ||
1da177e4 LT |
315 | /* Attach to any functions which should be ignored in wchan output. */ |
316 | #define __sched __attribute__((__section__(".sched.text"))) | |
deaf2227 IM |
317 | |
318 | /* Linker adds these: start and end of __sched functions */ | |
319 | extern char __sched_text_start[], __sched_text_end[]; | |
320 | ||
1da177e4 LT |
321 | /* Is this address in the __sched functions? */ |
322 | extern int in_sched_functions(unsigned long addr); | |
323 | ||
324 | #define MAX_SCHEDULE_TIMEOUT LONG_MAX | |
325 | extern signed long FASTCALL(schedule_timeout(signed long timeout)); | |
64ed93a2 | 326 | extern signed long schedule_timeout_interruptible(signed long timeout); |
294d5cc2 | 327 | extern signed long schedule_timeout_killable(signed long timeout); |
64ed93a2 | 328 | extern signed long schedule_timeout_uninterruptible(signed long timeout); |
1da177e4 LT |
329 | asmlinkage void schedule(void); |
330 | ||
ab516013 | 331 | struct nsproxy; |
acce292c | 332 | struct user_namespace; |
1da177e4 LT |
333 | |
334 | /* Maximum number of active map areas.. This is a random (large) number */ | |
335 | #define DEFAULT_MAX_MAP_COUNT 65536 | |
336 | ||
337 | extern int sysctl_max_map_count; | |
338 | ||
339 | #include <linux/aio.h> | |
340 | ||
341 | extern unsigned long | |
342 | arch_get_unmapped_area(struct file *, unsigned long, unsigned long, | |
343 | unsigned long, unsigned long); | |
344 | extern unsigned long | |
345 | arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, | |
346 | unsigned long len, unsigned long pgoff, | |
347 | unsigned long flags); | |
1363c3cd WW |
348 | extern void arch_unmap_area(struct mm_struct *, unsigned long); |
349 | extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long); | |
1da177e4 | 350 | |
f412ac08 HD |
351 | #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS |
352 | /* | |
353 | * The mm counters are not protected by its page_table_lock, | |
354 | * so must be incremented atomically. | |
355 | */ | |
d3cb4871 CL |
356 | #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value) |
357 | #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member)) | |
358 | #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member) | |
359 | #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member) | |
360 | #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member) | |
f412ac08 HD |
361 | |
362 | #else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */ | |
363 | /* | |
364 | * The mm counters are protected by its page_table_lock, | |
365 | * so can be incremented directly. | |
366 | */ | |
1da177e4 LT |
367 | #define set_mm_counter(mm, member, value) (mm)->_##member = (value) |
368 | #define get_mm_counter(mm, member) ((mm)->_##member) | |
369 | #define add_mm_counter(mm, member, value) (mm)->_##member += (value) | |
370 | #define inc_mm_counter(mm, member) (mm)->_##member++ | |
371 | #define dec_mm_counter(mm, member) (mm)->_##member-- | |
f412ac08 HD |
372 | |
373 | #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */ | |
4294621f | 374 | |
f412ac08 HD |
375 | #define get_mm_rss(mm) \ |
376 | (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss)) | |
365e9c87 HD |
377 | #define update_hiwater_rss(mm) do { \ |
378 | unsigned long _rss = get_mm_rss(mm); \ | |
379 | if ((mm)->hiwater_rss < _rss) \ | |
380 | (mm)->hiwater_rss = _rss; \ | |
381 | } while (0) | |
382 | #define update_hiwater_vm(mm) do { \ | |
383 | if ((mm)->hiwater_vm < (mm)->total_vm) \ | |
384 | (mm)->hiwater_vm = (mm)->total_vm; \ | |
385 | } while (0) | |
386 | ||
6c5d5238 KH |
387 | extern void set_dumpable(struct mm_struct *mm, int value); |
388 | extern int get_dumpable(struct mm_struct *mm); | |
389 | ||
390 | /* mm flags */ | |
3cb4a0bb | 391 | /* dumpable bits */ |
6c5d5238 KH |
392 | #define MMF_DUMPABLE 0 /* core dump is permitted */ |
393 | #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */ | |
3cb4a0bb KH |
394 | #define MMF_DUMPABLE_BITS 2 |
395 | ||
396 | /* coredump filter bits */ | |
397 | #define MMF_DUMP_ANON_PRIVATE 2 | |
398 | #define MMF_DUMP_ANON_SHARED 3 | |
399 | #define MMF_DUMP_MAPPED_PRIVATE 4 | |
400 | #define MMF_DUMP_MAPPED_SHARED 5 | |
82df3973 | 401 | #define MMF_DUMP_ELF_HEADERS 6 |
3cb4a0bb | 402 | #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS |
82df3973 | 403 | #define MMF_DUMP_FILTER_BITS 5 |
3cb4a0bb KH |
404 | #define MMF_DUMP_FILTER_MASK \ |
405 | (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT) | |
406 | #define MMF_DUMP_FILTER_DEFAULT \ | |
407 | ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED)) | |
6c5d5238 | 408 | |
1da177e4 LT |
409 | struct sighand_struct { |
410 | atomic_t count; | |
411 | struct k_sigaction action[_NSIG]; | |
412 | spinlock_t siglock; | |
b8fceee1 | 413 | wait_queue_head_t signalfd_wqh; |
1da177e4 LT |
414 | }; |
415 | ||
0e464814 | 416 | struct pacct_struct { |
f6ec29a4 KK |
417 | int ac_flag; |
418 | long ac_exitcode; | |
0e464814 | 419 | unsigned long ac_mem; |
77787bfb KK |
420 | cputime_t ac_utime, ac_stime; |
421 | unsigned long ac_minflt, ac_majflt; | |
0e464814 KK |
422 | }; |
423 | ||
1da177e4 LT |
424 | /* |
425 | * NOTE! "signal_struct" does not have it's own | |
426 | * locking, because a shared signal_struct always | |
427 | * implies a shared sighand_struct, so locking | |
428 | * sighand_struct is always a proper superset of | |
429 | * the locking of signal_struct. | |
430 | */ | |
431 | struct signal_struct { | |
432 | atomic_t count; | |
433 | atomic_t live; | |
434 | ||
435 | wait_queue_head_t wait_chldexit; /* for wait4() */ | |
436 | ||
437 | /* current thread group signal load-balancing target: */ | |
36c8b586 | 438 | struct task_struct *curr_target; |
1da177e4 LT |
439 | |
440 | /* shared signal handling: */ | |
441 | struct sigpending shared_pending; | |
442 | ||
443 | /* thread group exit support */ | |
444 | int group_exit_code; | |
445 | /* overloaded: | |
446 | * - notify group_exit_task when ->count is equal to notify_count | |
447 | * - everyone except group_exit_task is stopped during signal delivery | |
448 | * of fatal signals, group_exit_task processes the signal. | |
449 | */ | |
450 | struct task_struct *group_exit_task; | |
451 | int notify_count; | |
452 | ||
453 | /* thread group stop support, overloads group_exit_code too */ | |
454 | int group_stop_count; | |
455 | unsigned int flags; /* see SIGNAL_* flags below */ | |
456 | ||
457 | /* POSIX.1b Interval Timers */ | |
458 | struct list_head posix_timers; | |
459 | ||
460 | /* ITIMER_REAL timer for the process */ | |
2ff678b8 | 461 | struct hrtimer real_timer; |
05cfb614 | 462 | struct task_struct *tsk; |
2ff678b8 | 463 | ktime_t it_real_incr; |
1da177e4 LT |
464 | |
465 | /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */ | |
466 | cputime_t it_prof_expires, it_virt_expires; | |
467 | cputime_t it_prof_incr, it_virt_incr; | |
468 | ||
469 | /* job control IDs */ | |
9a2e7057 PE |
470 | |
471 | /* | |
472 | * pgrp and session fields are deprecated. | |
473 | * use the task_session_Xnr and task_pgrp_Xnr routines below | |
474 | */ | |
475 | ||
476 | union { | |
477 | pid_t pgrp __deprecated; | |
478 | pid_t __pgrp; | |
479 | }; | |
480 | ||
ab521dc0 | 481 | struct pid *tty_old_pgrp; |
1ec320af CLG |
482 | |
483 | union { | |
484 | pid_t session __deprecated; | |
485 | pid_t __session; | |
486 | }; | |
487 | ||
1da177e4 LT |
488 | /* boolean value for session group leader */ |
489 | int leader; | |
490 | ||
491 | struct tty_struct *tty; /* NULL if no tty */ | |
492 | ||
493 | /* | |
494 | * Cumulative resource counters for dead threads in the group, | |
495 | * and for reaped dead child processes forked by this group. | |
496 | * Live threads maintain their own counters and add to these | |
497 | * in __exit_signal, except for the group leader. | |
498 | */ | |
499 | cputime_t utime, stime, cutime, cstime; | |
9ac52315 LV |
500 | cputime_t gtime; |
501 | cputime_t cgtime; | |
1da177e4 LT |
502 | unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; |
503 | unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; | |
6eaeeaba | 504 | unsigned long inblock, oublock, cinblock, coublock; |
1da177e4 LT |
505 | |
506 | /* | |
507 | * Cumulative ns of scheduled CPU time for dead threads in the | |
508 | * group, not including a zombie group leader. (This only differs | |
509 | * from jiffies_to_ns(utime + stime) if sched_clock uses something | |
510 | * other than jiffies.) | |
511 | */ | |
41b86e9c | 512 | unsigned long long sum_sched_runtime; |
1da177e4 LT |
513 | |
514 | /* | |
515 | * We don't bother to synchronize most readers of this at all, | |
516 | * because there is no reader checking a limit that actually needs | |
517 | * to get both rlim_cur and rlim_max atomically, and either one | |
518 | * alone is a single word that can safely be read normally. | |
519 | * getrlimit/setrlimit use task_lock(current->group_leader) to | |
520 | * protect this instead of the siglock, because they really | |
521 | * have no need to disable irqs. | |
522 | */ | |
523 | struct rlimit rlim[RLIM_NLIMITS]; | |
524 | ||
525 | struct list_head cpu_timers[3]; | |
526 | ||
527 | /* keep the process-shared keyrings here so that they do the right | |
528 | * thing in threads created with CLONE_THREAD */ | |
529 | #ifdef CONFIG_KEYS | |
530 | struct key *session_keyring; /* keyring inherited over fork */ | |
531 | struct key *process_keyring; /* keyring private to this process */ | |
532 | #endif | |
0e464814 KK |
533 | #ifdef CONFIG_BSD_PROCESS_ACCT |
534 | struct pacct_struct pacct; /* per-process accounting information */ | |
535 | #endif | |
ad4ecbcb | 536 | #ifdef CONFIG_TASKSTATS |
ad4ecbcb SN |
537 | struct taskstats *stats; |
538 | #endif | |
522ed776 MT |
539 | #ifdef CONFIG_AUDIT |
540 | unsigned audit_tty; | |
541 | struct tty_audit_buf *tty_audit_buf; | |
542 | #endif | |
1da177e4 LT |
543 | }; |
544 | ||
4866cde0 NP |
545 | /* Context switch must be unlocked if interrupts are to be enabled */ |
546 | #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW | |
547 | # define __ARCH_WANT_UNLOCKED_CTXSW | |
548 | #endif | |
549 | ||
1da177e4 LT |
550 | /* |
551 | * Bits in flags field of signal_struct. | |
552 | */ | |
553 | #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ | |
554 | #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */ | |
555 | #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */ | |
556 | #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */ | |
557 | ||
ed5d2cac ON |
558 | /* If true, all threads except ->group_exit_task have pending SIGKILL */ |
559 | static inline int signal_group_exit(const struct signal_struct *sig) | |
560 | { | |
561 | return (sig->flags & SIGNAL_GROUP_EXIT) || | |
562 | (sig->group_exit_task != NULL); | |
563 | } | |
564 | ||
1da177e4 LT |
565 | /* |
566 | * Some day this will be a full-fledged user tracking system.. | |
567 | */ | |
568 | struct user_struct { | |
569 | atomic_t __count; /* reference count */ | |
570 | atomic_t processes; /* How many processes does this user have? */ | |
571 | atomic_t files; /* How many open files does this user have? */ | |
572 | atomic_t sigpending; /* How many pending signals does this user have? */ | |
2d9048e2 | 573 | #ifdef CONFIG_INOTIFY_USER |
0eeca283 RL |
574 | atomic_t inotify_watches; /* How many inotify watches does this user have? */ |
575 | atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ | |
576 | #endif | |
970a8645 | 577 | #ifdef CONFIG_POSIX_MQUEUE |
1da177e4 LT |
578 | /* protected by mq_lock */ |
579 | unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ | |
970a8645 | 580 | #endif |
1da177e4 LT |
581 | unsigned long locked_shm; /* How many pages of mlocked shm ? */ |
582 | ||
583 | #ifdef CONFIG_KEYS | |
584 | struct key *uid_keyring; /* UID specific keyring */ | |
585 | struct key *session_keyring; /* UID's default session keyring */ | |
586 | #endif | |
587 | ||
588 | /* Hash table maintenance information */ | |
735de223 | 589 | struct hlist_node uidhash_node; |
1da177e4 | 590 | uid_t uid; |
24e377a8 SV |
591 | |
592 | #ifdef CONFIG_FAIR_USER_SCHED | |
4cf86d77 | 593 | struct task_group *tg; |
b1a8c172 | 594 | #ifdef CONFIG_SYSFS |
eb41d946 | 595 | struct kobject kobj; |
5cb350ba | 596 | struct work_struct work; |
24e377a8 | 597 | #endif |
b1a8c172 | 598 | #endif |
1da177e4 LT |
599 | }; |
600 | ||
eb41d946 | 601 | extern int uids_sysfs_init(void); |
5cb350ba | 602 | |
1da177e4 LT |
603 | extern struct user_struct *find_user(uid_t); |
604 | ||
605 | extern struct user_struct root_user; | |
606 | #define INIT_USER (&root_user) | |
607 | ||
1da177e4 LT |
608 | struct backing_dev_info; |
609 | struct reclaim_state; | |
610 | ||
52f17b6c | 611 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
1da177e4 LT |
612 | struct sched_info { |
613 | /* cumulative counters */ | |
2d72376b | 614 | unsigned long pcount; /* # of times run on this cpu */ |
172ba844 BS |
615 | unsigned long long cpu_time, /* time spent on the cpu */ |
616 | run_delay; /* time spent waiting on a runqueue */ | |
1da177e4 LT |
617 | |
618 | /* timestamps */ | |
172ba844 BS |
619 | unsigned long long last_arrival,/* when we last ran on a cpu */ |
620 | last_queued; /* when we were last queued to run */ | |
b8efb561 IM |
621 | #ifdef CONFIG_SCHEDSTATS |
622 | /* BKL stats */ | |
480b9434 | 623 | unsigned int bkl_count; |
b8efb561 | 624 | #endif |
1da177e4 | 625 | }; |
52f17b6c | 626 | #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */ |
1da177e4 | 627 | |
52f17b6c | 628 | #ifdef CONFIG_SCHEDSTATS |
15ad7cdc | 629 | extern const struct file_operations proc_schedstat_operations; |
52f17b6c | 630 | #endif /* CONFIG_SCHEDSTATS */ |
1da177e4 | 631 | |
ca74e92b SN |
632 | #ifdef CONFIG_TASK_DELAY_ACCT |
633 | struct task_delay_info { | |
634 | spinlock_t lock; | |
635 | unsigned int flags; /* Private per-task flags */ | |
636 | ||
637 | /* For each stat XXX, add following, aligned appropriately | |
638 | * | |
639 | * struct timespec XXX_start, XXX_end; | |
640 | * u64 XXX_delay; | |
641 | * u32 XXX_count; | |
642 | * | |
643 | * Atomicity of updates to XXX_delay, XXX_count protected by | |
644 | * single lock above (split into XXX_lock if contention is an issue). | |
645 | */ | |
0ff92245 SN |
646 | |
647 | /* | |
648 | * XXX_count is incremented on every XXX operation, the delay | |
649 | * associated with the operation is added to XXX_delay. | |
650 | * XXX_delay contains the accumulated delay time in nanoseconds. | |
651 | */ | |
652 | struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */ | |
653 | u64 blkio_delay; /* wait for sync block io completion */ | |
654 | u64 swapin_delay; /* wait for swapin block io completion */ | |
655 | u32 blkio_count; /* total count of the number of sync block */ | |
656 | /* io operations performed */ | |
657 | u32 swapin_count; /* total count of the number of swapin block */ | |
658 | /* io operations performed */ | |
ca74e92b | 659 | }; |
52f17b6c CS |
660 | #endif /* CONFIG_TASK_DELAY_ACCT */ |
661 | ||
662 | static inline int sched_info_on(void) | |
663 | { | |
664 | #ifdef CONFIG_SCHEDSTATS | |
665 | return 1; | |
666 | #elif defined(CONFIG_TASK_DELAY_ACCT) | |
667 | extern int delayacct_on; | |
668 | return delayacct_on; | |
669 | #else | |
670 | return 0; | |
ca74e92b | 671 | #endif |
52f17b6c | 672 | } |
ca74e92b | 673 | |
d15bcfdb IM |
674 | enum cpu_idle_type { |
675 | CPU_IDLE, | |
676 | CPU_NOT_IDLE, | |
677 | CPU_NEWLY_IDLE, | |
678 | CPU_MAX_IDLE_TYPES | |
1da177e4 LT |
679 | }; |
680 | ||
681 | /* | |
682 | * sched-domains (multiprocessor balancing) declarations: | |
683 | */ | |
9aa7b369 IM |
684 | |
685 | /* | |
686 | * Increase resolution of nice-level calculations: | |
687 | */ | |
688 | #define SCHED_LOAD_SHIFT 10 | |
689 | #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT) | |
690 | ||
f8700df7 | 691 | #define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE |
1da177e4 | 692 | |
2dd73a4f | 693 | #ifdef CONFIG_SMP |
1da177e4 LT |
694 | #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */ |
695 | #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */ | |
696 | #define SD_BALANCE_EXEC 4 /* Balance on exec */ | |
147cbb4b NP |
697 | #define SD_BALANCE_FORK 8 /* Balance on fork, clone */ |
698 | #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */ | |
699 | #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */ | |
700 | #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */ | |
701 | #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */ | |
5c45bf27 | 702 | #define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */ |
89c4710e | 703 | #define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */ |
08c183f3 | 704 | #define SD_SERIALIZE 1024 /* Only a single load balancing instance */ |
5c45bf27 | 705 | |
89c4710e SS |
706 | #define BALANCE_FOR_MC_POWER \ |
707 | (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0) | |
708 | ||
709 | #define BALANCE_FOR_PKG_POWER \ | |
710 | ((sched_mc_power_savings || sched_smt_power_savings) ? \ | |
711 | SD_POWERSAVINGS_BALANCE : 0) | |
712 | ||
713 | #define test_sd_parent(sd, flag) ((sd->parent && \ | |
714 | (sd->parent->flags & flag)) ? 1 : 0) | |
5c45bf27 | 715 | |
1da177e4 LT |
716 | |
717 | struct sched_group { | |
718 | struct sched_group *next; /* Must be a circular list */ | |
719 | cpumask_t cpumask; | |
720 | ||
721 | /* | |
722 | * CPU power of this group, SCHED_LOAD_SCALE being max power for a | |
723 | * single CPU. This is read only (except for setup, hotplug CPU). | |
5517d86b | 724 | * Note : Never change cpu_power without recompute its reciprocal |
1da177e4 | 725 | */ |
5517d86b ED |
726 | unsigned int __cpu_power; |
727 | /* | |
728 | * reciprocal value of cpu_power to avoid expensive divides | |
729 | * (see include/linux/reciprocal_div.h) | |
730 | */ | |
731 | u32 reciprocal_cpu_power; | |
1da177e4 LT |
732 | }; |
733 | ||
734 | struct sched_domain { | |
735 | /* These fields must be setup */ | |
736 | struct sched_domain *parent; /* top domain must be null terminated */ | |
1a848870 | 737 | struct sched_domain *child; /* bottom domain must be null terminated */ |
1da177e4 LT |
738 | struct sched_group *groups; /* the balancing groups of the domain */ |
739 | cpumask_t span; /* span of all CPUs in this domain */ | |
740 | unsigned long min_interval; /* Minimum balance interval ms */ | |
741 | unsigned long max_interval; /* Maximum balance interval ms */ | |
742 | unsigned int busy_factor; /* less balancing by factor if busy */ | |
743 | unsigned int imbalance_pct; /* No balance until over watermark */ | |
1da177e4 | 744 | unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ |
7897986b NP |
745 | unsigned int busy_idx; |
746 | unsigned int idle_idx; | |
747 | unsigned int newidle_idx; | |
748 | unsigned int wake_idx; | |
147cbb4b | 749 | unsigned int forkexec_idx; |
1da177e4 LT |
750 | int flags; /* See SD_* */ |
751 | ||
752 | /* Runtime fields. */ | |
753 | unsigned long last_balance; /* init to jiffies. units in jiffies */ | |
754 | unsigned int balance_interval; /* initialise to 1. units in ms. */ | |
755 | unsigned int nr_balance_failed; /* initialise to 0 */ | |
756 | ||
757 | #ifdef CONFIG_SCHEDSTATS | |
758 | /* load_balance() stats */ | |
480b9434 KC |
759 | unsigned int lb_count[CPU_MAX_IDLE_TYPES]; |
760 | unsigned int lb_failed[CPU_MAX_IDLE_TYPES]; | |
761 | unsigned int lb_balanced[CPU_MAX_IDLE_TYPES]; | |
762 | unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES]; | |
763 | unsigned int lb_gained[CPU_MAX_IDLE_TYPES]; | |
764 | unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; | |
765 | unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; | |
766 | unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; | |
1da177e4 LT |
767 | |
768 | /* Active load balancing */ | |
480b9434 KC |
769 | unsigned int alb_count; |
770 | unsigned int alb_failed; | |
771 | unsigned int alb_pushed; | |
1da177e4 | 772 | |
68767a0a | 773 | /* SD_BALANCE_EXEC stats */ |
480b9434 KC |
774 | unsigned int sbe_count; |
775 | unsigned int sbe_balanced; | |
776 | unsigned int sbe_pushed; | |
1da177e4 | 777 | |
68767a0a | 778 | /* SD_BALANCE_FORK stats */ |
480b9434 KC |
779 | unsigned int sbf_count; |
780 | unsigned int sbf_balanced; | |
781 | unsigned int sbf_pushed; | |
68767a0a | 782 | |
1da177e4 | 783 | /* try_to_wake_up() stats */ |
480b9434 KC |
784 | unsigned int ttwu_wake_remote; |
785 | unsigned int ttwu_move_affine; | |
786 | unsigned int ttwu_move_balance; | |
1da177e4 LT |
787 | #endif |
788 | }; | |
789 | ||
029190c5 PJ |
790 | extern void partition_sched_domains(int ndoms_new, cpumask_t *doms_new); |
791 | ||
198e2f18 | 792 | #endif /* CONFIG_SMP */ |
1da177e4 | 793 | |
d02c7a8c CK |
794 | /* |
795 | * A runqueue laden with a single nice 0 task scores a weighted_cpuload of | |
796 | * SCHED_LOAD_SCALE. This function returns 1 if any cpu is laden with a | |
797 | * task of nice 0 or enough lower priority tasks to bring up the | |
798 | * weighted_cpuload | |
799 | */ | |
800 | static inline int above_background_load(void) | |
801 | { | |
802 | unsigned long cpu; | |
803 | ||
804 | for_each_online_cpu(cpu) { | |
805 | if (weighted_cpuload(cpu) >= SCHED_LOAD_SCALE) | |
806 | return 1; | |
807 | } | |
808 | return 0; | |
809 | } | |
1da177e4 LT |
810 | |
811 | struct io_context; /* See blkdev.h */ | |
1da177e4 | 812 | #define NGROUPS_SMALL 32 |
1bf47346 | 813 | #define NGROUPS_PER_BLOCK ((unsigned int)(PAGE_SIZE / sizeof(gid_t))) |
1da177e4 LT |
814 | struct group_info { |
815 | int ngroups; | |
816 | atomic_t usage; | |
817 | gid_t small_block[NGROUPS_SMALL]; | |
818 | int nblocks; | |
819 | gid_t *blocks[0]; | |
820 | }; | |
821 | ||
822 | /* | |
823 | * get_group_info() must be called with the owning task locked (via task_lock()) | |
824 | * when task != current. The reason being that the vast majority of callers are | |
825 | * looking at current->group_info, which can not be changed except by the | |
826 | * current task. Changing current->group_info requires the task lock, too. | |
827 | */ | |
828 | #define get_group_info(group_info) do { \ | |
829 | atomic_inc(&(group_info)->usage); \ | |
830 | } while (0) | |
831 | ||
832 | #define put_group_info(group_info) do { \ | |
833 | if (atomic_dec_and_test(&(group_info)->usage)) \ | |
834 | groups_free(group_info); \ | |
835 | } while (0) | |
836 | ||
3e30148c DH |
837 | extern struct group_info *groups_alloc(int gidsetsize); |
838 | extern void groups_free(struct group_info *group_info); | |
839 | extern int set_current_groups(struct group_info *group_info); | |
840 | extern int groups_search(struct group_info *group_info, gid_t grp); | |
1da177e4 LT |
841 | /* access the groups "array" with this macro */ |
842 | #define GROUP_AT(gi, i) \ | |
843 | ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK]) | |
844 | ||
383f2835 | 845 | #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK |
36c8b586 | 846 | extern void prefetch_stack(struct task_struct *t); |
383f2835 KC |
847 | #else |
848 | static inline void prefetch_stack(struct task_struct *t) { } | |
849 | #endif | |
1da177e4 LT |
850 | |
851 | struct audit_context; /* See audit.c */ | |
852 | struct mempolicy; | |
b92ce558 | 853 | struct pipe_inode_info; |
4865ecf1 | 854 | struct uts_namespace; |
1da177e4 | 855 | |
20b8a59f IM |
856 | struct rq; |
857 | struct sched_domain; | |
858 | ||
859 | struct sched_class { | |
5522d5d5 | 860 | const struct sched_class *next; |
20b8a59f | 861 | |
fd390f6a | 862 | void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup); |
f02231e5 | 863 | void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep); |
4530d7ab | 864 | void (*yield_task) (struct rq *rq); |
e7693a36 | 865 | int (*select_task_rq)(struct task_struct *p, int sync); |
20b8a59f IM |
866 | |
867 | void (*check_preempt_curr) (struct rq *rq, struct task_struct *p); | |
868 | ||
fb8d4724 | 869 | struct task_struct * (*pick_next_task) (struct rq *rq); |
31ee529c | 870 | void (*put_prev_task) (struct rq *rq, struct task_struct *p); |
20b8a59f | 871 | |
681f3e68 | 872 | #ifdef CONFIG_SMP |
43010659 | 873 | unsigned long (*load_balance) (struct rq *this_rq, int this_cpu, |
e1d1484f | 874 | struct rq *busiest, unsigned long max_load_move, |
20b8a59f | 875 | struct sched_domain *sd, enum cpu_idle_type idle, |
a4ac01c3 | 876 | int *all_pinned, int *this_best_prio); |
20b8a59f | 877 | |
e1d1484f PW |
878 | int (*move_one_task) (struct rq *this_rq, int this_cpu, |
879 | struct rq *busiest, struct sched_domain *sd, | |
880 | enum cpu_idle_type idle); | |
9a897c5a SR |
881 | void (*pre_schedule) (struct rq *this_rq, struct task_struct *task); |
882 | void (*post_schedule) (struct rq *this_rq); | |
883 | void (*task_wake_up) (struct rq *this_rq, struct task_struct *task); | |
681f3e68 | 884 | #endif |
e1d1484f | 885 | |
83b699ed | 886 | void (*set_curr_task) (struct rq *rq); |
8f4d37ec | 887 | void (*task_tick) (struct rq *rq, struct task_struct *p, int queued); |
ee0827d8 | 888 | void (*task_new) (struct rq *rq, struct task_struct *p); |
73fe6aae | 889 | void (*set_cpus_allowed)(struct task_struct *p, cpumask_t *newmask); |
57d885fe GH |
890 | |
891 | void (*join_domain)(struct rq *rq); | |
892 | void (*leave_domain)(struct rq *rq); | |
cb469845 SR |
893 | |
894 | void (*switched_from) (struct rq *this_rq, struct task_struct *task, | |
895 | int running); | |
896 | void (*switched_to) (struct rq *this_rq, struct task_struct *task, | |
897 | int running); | |
898 | void (*prio_changed) (struct rq *this_rq, struct task_struct *task, | |
899 | int oldprio, int running); | |
20b8a59f IM |
900 | }; |
901 | ||
902 | struct load_weight { | |
903 | unsigned long weight, inv_weight; | |
904 | }; | |
905 | ||
906 | /* | |
907 | * CFS stats for a schedulable entity (task, task-group etc) | |
908 | * | |
909 | * Current field usage histogram: | |
910 | * | |
911 | * 4 se->block_start | |
912 | * 4 se->run_node | |
913 | * 4 se->sleep_start | |
20b8a59f | 914 | * 6 se->load.weight |
20b8a59f IM |
915 | */ |
916 | struct sched_entity { | |
20b8a59f IM |
917 | struct load_weight load; /* for load-balancing */ |
918 | struct rb_node run_node; | |
919 | unsigned int on_rq; | |
920 | ||
94c18227 IM |
921 | u64 exec_start; |
922 | u64 sum_exec_runtime; | |
e9acbff6 | 923 | u64 vruntime; |
f6cf891c | 924 | u64 prev_sum_exec_runtime; |
94c18227 IM |
925 | |
926 | #ifdef CONFIG_SCHEDSTATS | |
20b8a59f | 927 | u64 wait_start; |
94c18227 | 928 | u64 wait_max; |
6d082592 AV |
929 | u64 wait_count; |
930 | u64 wait_sum; | |
94c18227 | 931 | |
20b8a59f | 932 | u64 sleep_start; |
20b8a59f | 933 | u64 sleep_max; |
94c18227 IM |
934 | s64 sum_sleep_runtime; |
935 | ||
936 | u64 block_start; | |
20b8a59f IM |
937 | u64 block_max; |
938 | u64 exec_max; | |
eba1ed4b | 939 | u64 slice_max; |
cc367732 IM |
940 | |
941 | u64 nr_migrations; | |
942 | u64 nr_migrations_cold; | |
943 | u64 nr_failed_migrations_affine; | |
944 | u64 nr_failed_migrations_running; | |
945 | u64 nr_failed_migrations_hot; | |
946 | u64 nr_forced_migrations; | |
947 | u64 nr_forced2_migrations; | |
948 | ||
949 | u64 nr_wakeups; | |
950 | u64 nr_wakeups_sync; | |
951 | u64 nr_wakeups_migrate; | |
952 | u64 nr_wakeups_local; | |
953 | u64 nr_wakeups_remote; | |
954 | u64 nr_wakeups_affine; | |
955 | u64 nr_wakeups_affine_attempts; | |
956 | u64 nr_wakeups_passive; | |
957 | u64 nr_wakeups_idle; | |
94c18227 IM |
958 | #endif |
959 | ||
20b8a59f IM |
960 | #ifdef CONFIG_FAIR_GROUP_SCHED |
961 | struct sched_entity *parent; | |
962 | /* rq on which this entity is (to be) queued: */ | |
963 | struct cfs_rq *cfs_rq; | |
964 | /* rq "owned" by this entity/group: */ | |
965 | struct cfs_rq *my_q; | |
966 | #endif | |
967 | }; | |
70b97a7f | 968 | |
fa717060 PZ |
969 | struct sched_rt_entity { |
970 | struct list_head run_list; | |
971 | unsigned int time_slice; | |
78f2c7db | 972 | unsigned long timeout; |
6f505b16 PZ |
973 | int nr_cpus_allowed; |
974 | ||
975 | #ifdef CONFIG_FAIR_GROUP_SCHED | |
976 | struct sched_rt_entity *parent; | |
977 | /* rq on which this entity is (to be) queued: */ | |
978 | struct rt_rq *rt_rq; | |
979 | /* rq "owned" by this entity/group: */ | |
980 | struct rt_rq *my_q; | |
981 | #endif | |
fa717060 PZ |
982 | }; |
983 | ||
1da177e4 LT |
984 | struct task_struct { |
985 | volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ | |
f7e4217b | 986 | void *stack; |
1da177e4 | 987 | atomic_t usage; |
97dc32cd WC |
988 | unsigned int flags; /* per process flags, defined below */ |
989 | unsigned int ptrace; | |
1da177e4 | 990 | |
36772092 | 991 | int lock_depth; /* BKL lock depth */ |
1da177e4 | 992 | |
2dd73a4f PW |
993 | #ifdef CONFIG_SMP |
994 | #ifdef __ARCH_WANT_UNLOCKED_CTXSW | |
4866cde0 NP |
995 | int oncpu; |
996 | #endif | |
2dd73a4f | 997 | #endif |
50e645a8 | 998 | |
b29739f9 | 999 | int prio, static_prio, normal_prio; |
5522d5d5 | 1000 | const struct sched_class *sched_class; |
20b8a59f | 1001 | struct sched_entity se; |
fa717060 | 1002 | struct sched_rt_entity rt; |
1da177e4 | 1003 | |
e107be36 AK |
1004 | #ifdef CONFIG_PREEMPT_NOTIFIERS |
1005 | /* list of struct preempt_notifier: */ | |
1006 | struct hlist_head preempt_notifiers; | |
1007 | #endif | |
1008 | ||
18796aa0 AD |
1009 | /* |
1010 | * fpu_counter contains the number of consecutive context switches | |
1011 | * that the FPU is used. If this is over a threshold, the lazy fpu | |
1012 | * saving becomes unlazy to save the trap. This is an unsigned char | |
1013 | * so that after 256 times the counter wraps and the behavior turns | |
1014 | * lazy again; this to deal with bursty apps that only use FPU for | |
1015 | * a short time | |
1016 | */ | |
1017 | unsigned char fpu_counter; | |
1018 | s8 oomkilladj; /* OOM kill score adjustment (bit shift). */ | |
6c5c9341 | 1019 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 1020 | unsigned int btrace_seq; |
6c5c9341 | 1021 | #endif |
1da177e4 | 1022 | |
97dc32cd | 1023 | unsigned int policy; |
1da177e4 | 1024 | cpumask_t cpus_allowed; |
1da177e4 | 1025 | |
e260be67 PM |
1026 | #ifdef CONFIG_PREEMPT_RCU |
1027 | int rcu_read_lock_nesting; | |
1028 | int rcu_flipctr_idx; | |
1029 | #endif /* #ifdef CONFIG_PREEMPT_RCU */ | |
1030 | ||
52f17b6c | 1031 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
1da177e4 LT |
1032 | struct sched_info sched_info; |
1033 | #endif | |
1034 | ||
1035 | struct list_head tasks; | |
1036 | /* | |
1037 | * ptrace_list/ptrace_children forms the list of my children | |
1038 | * that were stolen by a ptracer. | |
1039 | */ | |
1040 | struct list_head ptrace_children; | |
1041 | struct list_head ptrace_list; | |
1042 | ||
1043 | struct mm_struct *mm, *active_mm; | |
1044 | ||
1045 | /* task state */ | |
1046 | struct linux_binfmt *binfmt; | |
97dc32cd | 1047 | int exit_state; |
1da177e4 LT |
1048 | int exit_code, exit_signal; |
1049 | int pdeath_signal; /* The signal sent when the parent dies */ | |
1050 | /* ??? */ | |
97dc32cd | 1051 | unsigned int personality; |
1da177e4 LT |
1052 | unsigned did_exec:1; |
1053 | pid_t pid; | |
1054 | pid_t tgid; | |
0a425405 AV |
1055 | |
1056 | #ifdef CONFIG_CC_STACKPROTECTOR | |
1057 | /* Canary value for the -fstack-protector gcc feature */ | |
1058 | unsigned long stack_canary; | |
1059 | #endif | |
1da177e4 LT |
1060 | /* |
1061 | * pointers to (original) parent process, youngest child, younger sibling, | |
1062 | * older sibling, respectively. (p->father can be replaced with | |
1063 | * p->parent->pid) | |
1064 | */ | |
1065 | struct task_struct *real_parent; /* real parent process (when being debugged) */ | |
1066 | struct task_struct *parent; /* parent process */ | |
1067 | /* | |
1068 | * children/sibling forms the list of my children plus the | |
1069 | * tasks I'm ptracing. | |
1070 | */ | |
1071 | struct list_head children; /* list of my children */ | |
1072 | struct list_head sibling; /* linkage in my parent's children list */ | |
1073 | struct task_struct *group_leader; /* threadgroup leader */ | |
1074 | ||
1075 | /* PID/PID hash table linkage. */ | |
92476d7f | 1076 | struct pid_link pids[PIDTYPE_MAX]; |
47e65328 | 1077 | struct list_head thread_group; |
1da177e4 LT |
1078 | |
1079 | struct completion *vfork_done; /* for vfork() */ | |
1080 | int __user *set_child_tid; /* CLONE_CHILD_SETTID */ | |
1081 | int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ | |
1082 | ||
97dc32cd | 1083 | unsigned int rt_priority; |
c66f08be | 1084 | cputime_t utime, stime, utimescaled, stimescaled; |
9ac52315 | 1085 | cputime_t gtime; |
9301899b | 1086 | cputime_t prev_utime, prev_stime; |
1da177e4 | 1087 | unsigned long nvcsw, nivcsw; /* context switch counts */ |
924b42d5 TJ |
1088 | struct timespec start_time; /* monotonic time */ |
1089 | struct timespec real_start_time; /* boot based time */ | |
1da177e4 LT |
1090 | /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ |
1091 | unsigned long min_flt, maj_flt; | |
1092 | ||
1093 | cputime_t it_prof_expires, it_virt_expires; | |
1094 | unsigned long long it_sched_expires; | |
1095 | struct list_head cpu_timers[3]; | |
1096 | ||
1097 | /* process credentials */ | |
1098 | uid_t uid,euid,suid,fsuid; | |
1099 | gid_t gid,egid,sgid,fsgid; | |
1100 | struct group_info *group_info; | |
3b7391de | 1101 | kernel_cap_t cap_effective, cap_inheritable, cap_permitted, cap_bset; |
1da177e4 LT |
1102 | unsigned keep_capabilities:1; |
1103 | struct user_struct *user; | |
1104 | #ifdef CONFIG_KEYS | |
b5f545c8 | 1105 | struct key *request_key_auth; /* assumed request_key authority */ |
1da177e4 | 1106 | struct key *thread_keyring; /* keyring private to this thread */ |
3e30148c | 1107 | unsigned char jit_keyring; /* default keyring to attach requested keys to */ |
1da177e4 | 1108 | #endif |
36772092 PBG |
1109 | char comm[TASK_COMM_LEN]; /* executable name excluding path |
1110 | - access with [gs]et_task_comm (which lock | |
1111 | it with task_lock()) | |
1112 | - initialized normally by flush_old_exec */ | |
1da177e4 LT |
1113 | /* file system info */ |
1114 | int link_count, total_link_count; | |
3d5b6fcc | 1115 | #ifdef CONFIG_SYSVIPC |
1da177e4 LT |
1116 | /* ipc stuff */ |
1117 | struct sysv_sem sysvsem; | |
3d5b6fcc | 1118 | #endif |
82a1fcb9 IM |
1119 | #ifdef CONFIG_DETECT_SOFTLOCKUP |
1120 | /* hung task detection */ | |
1121 | unsigned long last_switch_timestamp; | |
1122 | unsigned long last_switch_count; | |
1123 | #endif | |
1da177e4 LT |
1124 | /* CPU-specific state of this task */ |
1125 | struct thread_struct thread; | |
1126 | /* filesystem information */ | |
1127 | struct fs_struct *fs; | |
1128 | /* open file information */ | |
1129 | struct files_struct *files; | |
1651e14e | 1130 | /* namespaces */ |
ab516013 | 1131 | struct nsproxy *nsproxy; |
1da177e4 LT |
1132 | /* signal handlers */ |
1133 | struct signal_struct *signal; | |
1134 | struct sighand_struct *sighand; | |
1135 | ||
1136 | sigset_t blocked, real_blocked; | |
150256d8 | 1137 | sigset_t saved_sigmask; /* To be restored with TIF_RESTORE_SIGMASK */ |
1da177e4 LT |
1138 | struct sigpending pending; |
1139 | ||
1140 | unsigned long sas_ss_sp; | |
1141 | size_t sas_ss_size; | |
1142 | int (*notifier)(void *priv); | |
1143 | void *notifier_data; | |
1144 | sigset_t *notifier_mask; | |
57c521ce | 1145 | #ifdef CONFIG_SECURITY |
1da177e4 | 1146 | void *security; |
57c521ce | 1147 | #endif |
1da177e4 | 1148 | struct audit_context *audit_context; |
bfef93a5 AV |
1149 | #ifdef CONFIG_AUDITSYSCALL |
1150 | uid_t loginuid; | |
4746ec5b | 1151 | unsigned int sessionid; |
bfef93a5 | 1152 | #endif |
1da177e4 LT |
1153 | seccomp_t seccomp; |
1154 | ||
1155 | /* Thread group tracking */ | |
1156 | u32 parent_exec_id; | |
1157 | u32 self_exec_id; | |
1158 | /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */ | |
1159 | spinlock_t alloc_lock; | |
1da177e4 | 1160 | |
b29739f9 IM |
1161 | /* Protection of the PI data structures: */ |
1162 | spinlock_t pi_lock; | |
1163 | ||
23f78d4a IM |
1164 | #ifdef CONFIG_RT_MUTEXES |
1165 | /* PI waiters blocked on a rt_mutex held by this task */ | |
1166 | struct plist_head pi_waiters; | |
1167 | /* Deadlock detection and priority inheritance handling */ | |
1168 | struct rt_mutex_waiter *pi_blocked_on; | |
23f78d4a IM |
1169 | #endif |
1170 | ||
408894ee IM |
1171 | #ifdef CONFIG_DEBUG_MUTEXES |
1172 | /* mutex deadlock detection */ | |
1173 | struct mutex_waiter *blocked_on; | |
1174 | #endif | |
de30a2b3 IM |
1175 | #ifdef CONFIG_TRACE_IRQFLAGS |
1176 | unsigned int irq_events; | |
1177 | int hardirqs_enabled; | |
1178 | unsigned long hardirq_enable_ip; | |
1179 | unsigned int hardirq_enable_event; | |
1180 | unsigned long hardirq_disable_ip; | |
1181 | unsigned int hardirq_disable_event; | |
1182 | int softirqs_enabled; | |
1183 | unsigned long softirq_disable_ip; | |
1184 | unsigned int softirq_disable_event; | |
1185 | unsigned long softirq_enable_ip; | |
1186 | unsigned int softirq_enable_event; | |
1187 | int hardirq_context; | |
1188 | int softirq_context; | |
1189 | #endif | |
fbb9ce95 IM |
1190 | #ifdef CONFIG_LOCKDEP |
1191 | # define MAX_LOCK_DEPTH 30UL | |
1192 | u64 curr_chain_key; | |
1193 | int lockdep_depth; | |
1194 | struct held_lock held_locks[MAX_LOCK_DEPTH]; | |
1195 | unsigned int lockdep_recursion; | |
1196 | #endif | |
408894ee | 1197 | |
1da177e4 LT |
1198 | /* journalling filesystem info */ |
1199 | void *journal_info; | |
1200 | ||
d89d8796 NB |
1201 | /* stacked block device info */ |
1202 | struct bio *bio_list, **bio_tail; | |
1203 | ||
1da177e4 LT |
1204 | /* VM state */ |
1205 | struct reclaim_state *reclaim_state; | |
1206 | ||
1da177e4 LT |
1207 | struct backing_dev_info *backing_dev_info; |
1208 | ||
1209 | struct io_context *io_context; | |
1210 | ||
1211 | unsigned long ptrace_message; | |
1212 | siginfo_t *last_siginfo; /* For ptrace use. */ | |
4b98d11b | 1213 | #ifdef CONFIG_TASK_XACCT |
1da177e4 LT |
1214 | /* i/o counters(bytes read/written, #syscalls */ |
1215 | u64 rchar, wchar, syscr, syscw; | |
4b98d11b | 1216 | #endif |
7c3ab738 | 1217 | struct task_io_accounting ioac; |
8f0ab514 | 1218 | #if defined(CONFIG_TASK_XACCT) |
1da177e4 LT |
1219 | u64 acct_rss_mem1; /* accumulated rss usage */ |
1220 | u64 acct_vm_mem1; /* accumulated virtual memory usage */ | |
db5fed26 | 1221 | cputime_t acct_stimexpd;/* stime since last update */ |
1da177e4 LT |
1222 | #endif |
1223 | #ifdef CONFIG_NUMA | |
1224 | struct mempolicy *mempolicy; | |
1225 | short il_next; | |
1226 | #endif | |
1227 | #ifdef CONFIG_CPUSETS | |
1da177e4 LT |
1228 | nodemask_t mems_allowed; |
1229 | int cpuset_mems_generation; | |
825a46af | 1230 | int cpuset_mem_spread_rotor; |
1da177e4 | 1231 | #endif |
ddbcc7e8 | 1232 | #ifdef CONFIG_CGROUPS |
817929ec PM |
1233 | /* Control Group info protected by css_set_lock */ |
1234 | struct css_set *cgroups; | |
1235 | /* cg_list protected by css_set_lock and tsk->alloc_lock */ | |
1236 | struct list_head cg_list; | |
ddbcc7e8 | 1237 | #endif |
42b2dd0a | 1238 | #ifdef CONFIG_FUTEX |
0771dfef | 1239 | struct robust_list_head __user *robust_list; |
34f192c6 IM |
1240 | #ifdef CONFIG_COMPAT |
1241 | struct compat_robust_list_head __user *compat_robust_list; | |
1242 | #endif | |
c87e2837 IM |
1243 | struct list_head pi_state_list; |
1244 | struct futex_pi_state *pi_state_cache; | |
42b2dd0a | 1245 | #endif |
22e2c507 | 1246 | atomic_t fs_excl; /* holding fs exclusive resources */ |
e56d0903 | 1247 | struct rcu_head rcu; |
b92ce558 JA |
1248 | |
1249 | /* | |
1250 | * cache last used pipe for splice | |
1251 | */ | |
1252 | struct pipe_inode_info *splice_pipe; | |
ca74e92b SN |
1253 | #ifdef CONFIG_TASK_DELAY_ACCT |
1254 | struct task_delay_info *delays; | |
f4f154fd AM |
1255 | #endif |
1256 | #ifdef CONFIG_FAULT_INJECTION | |
1257 | int make_it_fail; | |
ca74e92b | 1258 | #endif |
3e26c149 | 1259 | struct prop_local_single dirties; |
9745512c AV |
1260 | #ifdef CONFIG_LATENCYTOP |
1261 | int latency_record_count; | |
1262 | struct latency_record latency_record[LT_SAVECOUNT]; | |
1263 | #endif | |
1da177e4 LT |
1264 | }; |
1265 | ||
e05606d3 IM |
1266 | /* |
1267 | * Priority of a process goes from 0..MAX_PRIO-1, valid RT | |
1268 | * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH | |
1269 | * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority | |
1270 | * values are inverted: lower p->prio value means higher priority. | |
1271 | * | |
1272 | * The MAX_USER_RT_PRIO value allows the actual maximum | |
1273 | * RT priority to be separate from the value exported to | |
1274 | * user-space. This allows kernel threads to set their | |
1275 | * priority to a value higher than any user task. Note: | |
1276 | * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. | |
1277 | */ | |
1278 | ||
1279 | #define MAX_USER_RT_PRIO 100 | |
1280 | #define MAX_RT_PRIO MAX_USER_RT_PRIO | |
1281 | ||
1282 | #define MAX_PRIO (MAX_RT_PRIO + 40) | |
1283 | #define DEFAULT_PRIO (MAX_RT_PRIO + 20) | |
1284 | ||
1285 | static inline int rt_prio(int prio) | |
1286 | { | |
1287 | if (unlikely(prio < MAX_RT_PRIO)) | |
1288 | return 1; | |
1289 | return 0; | |
1290 | } | |
1291 | ||
e868171a | 1292 | static inline int rt_task(struct task_struct *p) |
e05606d3 IM |
1293 | { |
1294 | return rt_prio(p->prio); | |
1295 | } | |
1296 | ||
a47afb0f | 1297 | static inline void set_task_session(struct task_struct *tsk, pid_t session) |
937949d9 | 1298 | { |
a47afb0f | 1299 | tsk->signal->__session = session; |
937949d9 CLG |
1300 | } |
1301 | ||
9a2e7057 PE |
1302 | static inline void set_task_pgrp(struct task_struct *tsk, pid_t pgrp) |
1303 | { | |
1304 | tsk->signal->__pgrp = pgrp; | |
1305 | } | |
1306 | ||
e868171a | 1307 | static inline struct pid *task_pid(struct task_struct *task) |
22c935f4 EB |
1308 | { |
1309 | return task->pids[PIDTYPE_PID].pid; | |
1310 | } | |
1311 | ||
e868171a | 1312 | static inline struct pid *task_tgid(struct task_struct *task) |
22c935f4 EB |
1313 | { |
1314 | return task->group_leader->pids[PIDTYPE_PID].pid; | |
1315 | } | |
1316 | ||
e868171a | 1317 | static inline struct pid *task_pgrp(struct task_struct *task) |
22c935f4 EB |
1318 | { |
1319 | return task->group_leader->pids[PIDTYPE_PGID].pid; | |
1320 | } | |
1321 | ||
e868171a | 1322 | static inline struct pid *task_session(struct task_struct *task) |
22c935f4 EB |
1323 | { |
1324 | return task->group_leader->pids[PIDTYPE_SID].pid; | |
1325 | } | |
1326 | ||
7af57294 PE |
1327 | struct pid_namespace; |
1328 | ||
1329 | /* | |
1330 | * the helpers to get the task's different pids as they are seen | |
1331 | * from various namespaces | |
1332 | * | |
1333 | * task_xid_nr() : global id, i.e. the id seen from the init namespace; | |
1334 | * task_xid_vnr() : virtual id, i.e. the id seen from the namespace the task | |
1335 | * belongs to. this only makes sence when called in the | |
1336 | * context of the task that belongs to the same namespace; | |
1337 | * task_xid_nr_ns() : id seen from the ns specified; | |
1338 | * | |
1339 | * set_task_vxid() : assigns a virtual id to a task; | |
1340 | * | |
7af57294 PE |
1341 | * see also pid_nr() etc in include/linux/pid.h |
1342 | */ | |
1343 | ||
e868171a | 1344 | static inline pid_t task_pid_nr(struct task_struct *tsk) |
7af57294 PE |
1345 | { |
1346 | return tsk->pid; | |
1347 | } | |
1348 | ||
2f2a3a46 | 1349 | pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); |
7af57294 PE |
1350 | |
1351 | static inline pid_t task_pid_vnr(struct task_struct *tsk) | |
1352 | { | |
1353 | return pid_vnr(task_pid(tsk)); | |
1354 | } | |
1355 | ||
1356 | ||
e868171a | 1357 | static inline pid_t task_tgid_nr(struct task_struct *tsk) |
7af57294 PE |
1358 | { |
1359 | return tsk->tgid; | |
1360 | } | |
1361 | ||
2f2a3a46 | 1362 | pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); |
7af57294 PE |
1363 | |
1364 | static inline pid_t task_tgid_vnr(struct task_struct *tsk) | |
1365 | { | |
1366 | return pid_vnr(task_tgid(tsk)); | |
1367 | } | |
1368 | ||
1369 | ||
e868171a | 1370 | static inline pid_t task_pgrp_nr(struct task_struct *tsk) |
7af57294 | 1371 | { |
9a2e7057 | 1372 | return tsk->signal->__pgrp; |
7af57294 PE |
1373 | } |
1374 | ||
2f2a3a46 | 1375 | pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); |
7af57294 PE |
1376 | |
1377 | static inline pid_t task_pgrp_vnr(struct task_struct *tsk) | |
1378 | { | |
1379 | return pid_vnr(task_pgrp(tsk)); | |
1380 | } | |
1381 | ||
1382 | ||
e868171a | 1383 | static inline pid_t task_session_nr(struct task_struct *tsk) |
7af57294 PE |
1384 | { |
1385 | return tsk->signal->__session; | |
1386 | } | |
1387 | ||
2f2a3a46 | 1388 | pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); |
7af57294 PE |
1389 | |
1390 | static inline pid_t task_session_vnr(struct task_struct *tsk) | |
1391 | { | |
1392 | return pid_vnr(task_session(tsk)); | |
1393 | } | |
1394 | ||
1395 | ||
1da177e4 LT |
1396 | /** |
1397 | * pid_alive - check that a task structure is not stale | |
1398 | * @p: Task structure to be checked. | |
1399 | * | |
1400 | * Test if a process is not yet dead (at most zombie state) | |
1401 | * If pid_alive fails, then pointers within the task structure | |
1402 | * can be stale and must not be dereferenced. | |
1403 | */ | |
e868171a | 1404 | static inline int pid_alive(struct task_struct *p) |
1da177e4 | 1405 | { |
92476d7f | 1406 | return p->pids[PIDTYPE_PID].pid != NULL; |
1da177e4 LT |
1407 | } |
1408 | ||
f400e198 | 1409 | /** |
b460cbc5 | 1410 | * is_global_init - check if a task structure is init |
3260259f HK |
1411 | * @tsk: Task structure to be checked. |
1412 | * | |
1413 | * Check if a task structure is the first user space task the kernel created. | |
b460cbc5 | 1414 | */ |
e868171a | 1415 | static inline int is_global_init(struct task_struct *tsk) |
b461cc03 PE |
1416 | { |
1417 | return tsk->pid == 1; | |
1418 | } | |
b460cbc5 SH |
1419 | |
1420 | /* | |
1421 | * is_container_init: | |
1422 | * check whether in the task is init in its own pid namespace. | |
f400e198 | 1423 | */ |
b461cc03 | 1424 | extern int is_container_init(struct task_struct *tsk); |
f400e198 | 1425 | |
9ec52099 CLG |
1426 | extern struct pid *cad_pid; |
1427 | ||
1da177e4 | 1428 | extern void free_task(struct task_struct *tsk); |
1da177e4 | 1429 | #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) |
e56d0903 | 1430 | |
158d9ebd | 1431 | extern void __put_task_struct(struct task_struct *t); |
e56d0903 IM |
1432 | |
1433 | static inline void put_task_struct(struct task_struct *t) | |
1434 | { | |
1435 | if (atomic_dec_and_test(&t->usage)) | |
8c7904a0 | 1436 | __put_task_struct(t); |
e56d0903 | 1437 | } |
1da177e4 LT |
1438 | |
1439 | /* | |
1440 | * Per process flags | |
1441 | */ | |
1442 | #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */ | |
1443 | /* Not implemented yet, only for 486*/ | |
1444 | #define PF_STARTING 0x00000002 /* being created */ | |
1445 | #define PF_EXITING 0x00000004 /* getting shut down */ | |
778e9a9c | 1446 | #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ |
94886b84 | 1447 | #define PF_VCPU 0x00000010 /* I'm a virtual CPU */ |
1da177e4 LT |
1448 | #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ |
1449 | #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ | |
1450 | #define PF_DUMPCORE 0x00000200 /* dumped core */ | |
1451 | #define PF_SIGNALED 0x00000400 /* killed by a signal */ | |
1452 | #define PF_MEMALLOC 0x00000800 /* Allocating memory */ | |
1453 | #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */ | |
1454 | #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ | |
1da177e4 LT |
1455 | #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ |
1456 | #define PF_FROZEN 0x00010000 /* frozen for system suspend */ | |
1457 | #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ | |
1458 | #define PF_KSWAPD 0x00040000 /* I am kswapd */ | |
1459 | #define PF_SWAPOFF 0x00080000 /* I am in swapoff */ | |
1460 | #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ | |
b31dc66a JA |
1461 | #define PF_BORROWED_MM 0x00200000 /* I am a kthread doing use_mm */ |
1462 | #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ | |
1463 | #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ | |
1464 | #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */ | |
1465 | #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */ | |
c61afb18 | 1466 | #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */ |
61a87122 | 1467 | #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ |
ba96a0c8 | 1468 | #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */ |
1da177e4 LT |
1469 | |
1470 | /* | |
1471 | * Only the _current_ task can read/write to tsk->flags, but other | |
1472 | * tasks can access tsk->flags in readonly mode for example | |
1473 | * with tsk_used_math (like during threaded core dumping). | |
1474 | * There is however an exception to this rule during ptrace | |
1475 | * or during fork: the ptracer task is allowed to write to the | |
1476 | * child->flags of its traced child (same goes for fork, the parent | |
1477 | * can write to the child->flags), because we're guaranteed the | |
1478 | * child is not running and in turn not changing child->flags | |
1479 | * at the same time the parent does it. | |
1480 | */ | |
1481 | #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) | |
1482 | #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) | |
1483 | #define clear_used_math() clear_stopped_child_used_math(current) | |
1484 | #define set_used_math() set_stopped_child_used_math(current) | |
1485 | #define conditional_stopped_child_used_math(condition, child) \ | |
1486 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) | |
1487 | #define conditional_used_math(condition) \ | |
1488 | conditional_stopped_child_used_math(condition, current) | |
1489 | #define copy_to_stopped_child_used_math(child) \ | |
1490 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) | |
1491 | /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ | |
1492 | #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) | |
1493 | #define used_math() tsk_used_math(current) | |
1494 | ||
1495 | #ifdef CONFIG_SMP | |
36c8b586 | 1496 | extern int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask); |
1da177e4 | 1497 | #else |
36c8b586 | 1498 | static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) |
1da177e4 | 1499 | { |
4098f991 | 1500 | if (!cpu_isset(0, new_mask)) |
1da177e4 LT |
1501 | return -EINVAL; |
1502 | return 0; | |
1503 | } | |
1504 | #endif | |
1505 | ||
1506 | extern unsigned long long sched_clock(void); | |
e436d800 IM |
1507 | |
1508 | /* | |
1509 | * For kernel-internal use: high-speed (but slightly incorrect) per-cpu | |
1510 | * clock constructed from sched_clock(): | |
1511 | */ | |
1512 | extern unsigned long long cpu_clock(int cpu); | |
1513 | ||
36c8b586 | 1514 | extern unsigned long long |
41b86e9c | 1515 | task_sched_runtime(struct task_struct *task); |
1da177e4 LT |
1516 | |
1517 | /* sched_exec is called by processes performing an exec */ | |
1518 | #ifdef CONFIG_SMP | |
1519 | extern void sched_exec(void); | |
1520 | #else | |
1521 | #define sched_exec() {} | |
1522 | #endif | |
1523 | ||
2aa44d05 IM |
1524 | extern void sched_clock_idle_sleep_event(void); |
1525 | extern void sched_clock_idle_wakeup_event(u64 delta_ns); | |
bb29ab26 | 1526 | |
1da177e4 LT |
1527 | #ifdef CONFIG_HOTPLUG_CPU |
1528 | extern void idle_task_exit(void); | |
1529 | #else | |
1530 | static inline void idle_task_exit(void) {} | |
1531 | #endif | |
1532 | ||
1533 | extern void sched_idle_next(void); | |
b29739f9 | 1534 | |
2bd8e6d4 | 1535 | #ifdef CONFIG_SCHED_DEBUG |
21805085 | 1536 | extern unsigned int sysctl_sched_latency; |
b2be5e96 | 1537 | extern unsigned int sysctl_sched_min_granularity; |
bf0f6f24 IM |
1538 | extern unsigned int sysctl_sched_wakeup_granularity; |
1539 | extern unsigned int sysctl_sched_batch_wakeup_granularity; | |
bf0f6f24 IM |
1540 | extern unsigned int sysctl_sched_child_runs_first; |
1541 | extern unsigned int sysctl_sched_features; | |
da84d961 | 1542 | extern unsigned int sysctl_sched_migration_cost; |
b82d9fdd | 1543 | extern unsigned int sysctl_sched_nr_migrate; |
fa85ae24 PZ |
1544 | extern unsigned int sysctl_sched_rt_period; |
1545 | extern unsigned int sysctl_sched_rt_ratio; | |
6b2d7700 SV |
1546 | #if defined(CONFIG_FAIR_GROUP_SCHED) && defined(CONFIG_SMP) |
1547 | extern unsigned int sysctl_sched_min_bal_int_shares; | |
1548 | extern unsigned int sysctl_sched_max_bal_int_shares; | |
1549 | #endif | |
b2be5e96 PZ |
1550 | |
1551 | int sched_nr_latency_handler(struct ctl_table *table, int write, | |
1552 | struct file *file, void __user *buffer, size_t *length, | |
1553 | loff_t *ppos); | |
2bd8e6d4 IM |
1554 | #endif |
1555 | ||
1556 | extern unsigned int sysctl_sched_compat_yield; | |
bf0f6f24 | 1557 | |
b29739f9 | 1558 | #ifdef CONFIG_RT_MUTEXES |
36c8b586 IM |
1559 | extern int rt_mutex_getprio(struct task_struct *p); |
1560 | extern void rt_mutex_setprio(struct task_struct *p, int prio); | |
1561 | extern void rt_mutex_adjust_pi(struct task_struct *p); | |
b29739f9 | 1562 | #else |
e868171a | 1563 | static inline int rt_mutex_getprio(struct task_struct *p) |
b29739f9 IM |
1564 | { |
1565 | return p->normal_prio; | |
1566 | } | |
95e02ca9 | 1567 | # define rt_mutex_adjust_pi(p) do { } while (0) |
b29739f9 IM |
1568 | #endif |
1569 | ||
36c8b586 IM |
1570 | extern void set_user_nice(struct task_struct *p, long nice); |
1571 | extern int task_prio(const struct task_struct *p); | |
1572 | extern int task_nice(const struct task_struct *p); | |
1573 | extern int can_nice(const struct task_struct *p, const int nice); | |
1574 | extern int task_curr(const struct task_struct *p); | |
1da177e4 LT |
1575 | extern int idle_cpu(int cpu); |
1576 | extern int sched_setscheduler(struct task_struct *, int, struct sched_param *); | |
36c8b586 IM |
1577 | extern struct task_struct *idle_task(int cpu); |
1578 | extern struct task_struct *curr_task(int cpu); | |
1579 | extern void set_curr_task(int cpu, struct task_struct *p); | |
1da177e4 LT |
1580 | |
1581 | void yield(void); | |
1582 | ||
1583 | /* | |
1584 | * The default (Linux) execution domain. | |
1585 | */ | |
1586 | extern struct exec_domain default_exec_domain; | |
1587 | ||
1588 | union thread_union { | |
1589 | struct thread_info thread_info; | |
1590 | unsigned long stack[THREAD_SIZE/sizeof(long)]; | |
1591 | }; | |
1592 | ||
1593 | #ifndef __HAVE_ARCH_KSTACK_END | |
1594 | static inline int kstack_end(void *addr) | |
1595 | { | |
1596 | /* Reliable end of stack detection: | |
1597 | * Some APM bios versions misalign the stack | |
1598 | */ | |
1599 | return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); | |
1600 | } | |
1601 | #endif | |
1602 | ||
1603 | extern union thread_union init_thread_union; | |
1604 | extern struct task_struct init_task; | |
1605 | ||
1606 | extern struct mm_struct init_mm; | |
1607 | ||
198fe21b PE |
1608 | extern struct pid_namespace init_pid_ns; |
1609 | ||
1610 | /* | |
1611 | * find a task by one of its numerical ids | |
1612 | * | |
1613 | * find_task_by_pid_type_ns(): | |
1614 | * it is the most generic call - it finds a task by all id, | |
1615 | * type and namespace specified | |
1616 | * find_task_by_pid_ns(): | |
1617 | * finds a task by its pid in the specified namespace | |
228ebcbe PE |
1618 | * find_task_by_vpid(): |
1619 | * finds a task by its virtual pid | |
198fe21b PE |
1620 | * find_task_by_pid(): |
1621 | * finds a task by its global pid | |
1622 | * | |
1623 | * see also find_pid() etc in include/linux/pid.h | |
1624 | */ | |
1625 | ||
1626 | extern struct task_struct *find_task_by_pid_type_ns(int type, int pid, | |
1627 | struct pid_namespace *ns); | |
1628 | ||
228ebcbe PE |
1629 | extern struct task_struct *find_task_by_pid(pid_t nr); |
1630 | extern struct task_struct *find_task_by_vpid(pid_t nr); | |
1631 | extern struct task_struct *find_task_by_pid_ns(pid_t nr, | |
1632 | struct pid_namespace *ns); | |
198fe21b | 1633 | |
1da177e4 LT |
1634 | extern void __set_special_pids(pid_t session, pid_t pgrp); |
1635 | ||
1636 | /* per-UID process charging. */ | |
acce292c | 1637 | extern struct user_struct * alloc_uid(struct user_namespace *, uid_t); |
1da177e4 LT |
1638 | static inline struct user_struct *get_uid(struct user_struct *u) |
1639 | { | |
1640 | atomic_inc(&u->__count); | |
1641 | return u; | |
1642 | } | |
1643 | extern void free_uid(struct user_struct *); | |
1644 | extern void switch_uid(struct user_struct *); | |
28f300d2 | 1645 | extern void release_uids(struct user_namespace *ns); |
1da177e4 LT |
1646 | |
1647 | #include <asm/current.h> | |
1648 | ||
3171a030 | 1649 | extern void do_timer(unsigned long ticks); |
1da177e4 LT |
1650 | |
1651 | extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state)); | |
1652 | extern int FASTCALL(wake_up_process(struct task_struct * tsk)); | |
1653 | extern void FASTCALL(wake_up_new_task(struct task_struct * tsk, | |
1654 | unsigned long clone_flags)); | |
1655 | #ifdef CONFIG_SMP | |
1656 | extern void kick_process(struct task_struct *tsk); | |
1657 | #else | |
1658 | static inline void kick_process(struct task_struct *tsk) { } | |
1659 | #endif | |
ad46c2c4 IM |
1660 | extern void sched_fork(struct task_struct *p, int clone_flags); |
1661 | extern void sched_dead(struct task_struct *p); | |
1da177e4 LT |
1662 | |
1663 | extern int in_group_p(gid_t); | |
1664 | extern int in_egroup_p(gid_t); | |
1665 | ||
1666 | extern void proc_caches_init(void); | |
1667 | extern void flush_signals(struct task_struct *); | |
10ab825b | 1668 | extern void ignore_signals(struct task_struct *); |
1da177e4 LT |
1669 | extern void flush_signal_handlers(struct task_struct *, int force_default); |
1670 | extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); | |
1671 | ||
1672 | static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) | |
1673 | { | |
1674 | unsigned long flags; | |
1675 | int ret; | |
1676 | ||
1677 | spin_lock_irqsave(&tsk->sighand->siglock, flags); | |
1678 | ret = dequeue_signal(tsk, mask, info); | |
1679 | spin_unlock_irqrestore(&tsk->sighand->siglock, flags); | |
1680 | ||
1681 | return ret; | |
1682 | } | |
1683 | ||
1684 | extern void block_all_signals(int (*notifier)(void *priv), void *priv, | |
1685 | sigset_t *mask); | |
1686 | extern void unblock_all_signals(void); | |
1687 | extern void release_task(struct task_struct * p); | |
1688 | extern int send_sig_info(int, struct siginfo *, struct task_struct *); | |
1689 | extern int send_group_sig_info(int, struct siginfo *, struct task_struct *); | |
1690 | extern int force_sigsegv(int, struct task_struct *); | |
1691 | extern int force_sig_info(int, struct siginfo *, struct task_struct *); | |
c4b92fc1 EB |
1692 | extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); |
1693 | extern int kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); | |
1694 | extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid); | |
2425c08b | 1695 | extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32); |
c4b92fc1 EB |
1696 | extern int kill_pgrp(struct pid *pid, int sig, int priv); |
1697 | extern int kill_pid(struct pid *pid, int sig, int priv); | |
c3de4b38 | 1698 | extern int kill_proc_info(int, struct siginfo *, pid_t); |
1da177e4 LT |
1699 | extern void do_notify_parent(struct task_struct *, int); |
1700 | extern void force_sig(int, struct task_struct *); | |
1701 | extern void force_sig_specific(int, struct task_struct *); | |
1702 | extern int send_sig(int, struct task_struct *, int); | |
1703 | extern void zap_other_threads(struct task_struct *p); | |
1da177e4 LT |
1704 | extern int kill_proc(pid_t, int, int); |
1705 | extern struct sigqueue *sigqueue_alloc(void); | |
1706 | extern void sigqueue_free(struct sigqueue *); | |
1707 | extern int send_sigqueue(int, struct sigqueue *, struct task_struct *); | |
1708 | extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *); | |
9ac95f2f | 1709 | extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); |
1da177e4 LT |
1710 | extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); |
1711 | ||
9ec52099 CLG |
1712 | static inline int kill_cad_pid(int sig, int priv) |
1713 | { | |
1714 | return kill_pid(cad_pid, sig, priv); | |
1715 | } | |
1716 | ||
1da177e4 LT |
1717 | /* These can be the second arg to send_sig_info/send_group_sig_info. */ |
1718 | #define SEND_SIG_NOINFO ((struct siginfo *) 0) | |
1719 | #define SEND_SIG_PRIV ((struct siginfo *) 1) | |
1720 | #define SEND_SIG_FORCED ((struct siginfo *) 2) | |
1721 | ||
621d3121 ON |
1722 | static inline int is_si_special(const struct siginfo *info) |
1723 | { | |
1724 | return info <= SEND_SIG_FORCED; | |
1725 | } | |
1726 | ||
1da177e4 LT |
1727 | /* True if we are on the alternate signal stack. */ |
1728 | ||
1729 | static inline int on_sig_stack(unsigned long sp) | |
1730 | { | |
1731 | return (sp - current->sas_ss_sp < current->sas_ss_size); | |
1732 | } | |
1733 | ||
1734 | static inline int sas_ss_flags(unsigned long sp) | |
1735 | { | |
1736 | return (current->sas_ss_size == 0 ? SS_DISABLE | |
1737 | : on_sig_stack(sp) ? SS_ONSTACK : 0); | |
1738 | } | |
1739 | ||
1da177e4 LT |
1740 | /* |
1741 | * Routines for handling mm_structs | |
1742 | */ | |
1743 | extern struct mm_struct * mm_alloc(void); | |
1744 | ||
1745 | /* mmdrop drops the mm and the page tables */ | |
1746 | extern void FASTCALL(__mmdrop(struct mm_struct *)); | |
1747 | static inline void mmdrop(struct mm_struct * mm) | |
1748 | { | |
6fb43d7b | 1749 | if (unlikely(atomic_dec_and_test(&mm->mm_count))) |
1da177e4 LT |
1750 | __mmdrop(mm); |
1751 | } | |
1752 | ||
1753 | /* mmput gets rid of the mappings and all user-space */ | |
1754 | extern void mmput(struct mm_struct *); | |
1755 | /* Grab a reference to a task's mm, if it is not already going away */ | |
1756 | extern struct mm_struct *get_task_mm(struct task_struct *task); | |
1757 | /* Remove the current tasks stale references to the old mm_struct */ | |
1758 | extern void mm_release(struct task_struct *, struct mm_struct *); | |
1759 | ||
1760 | extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *); | |
1761 | extern void flush_thread(void); | |
1762 | extern void exit_thread(void); | |
1763 | ||
1da177e4 | 1764 | extern void exit_files(struct task_struct *); |
6b3934ef | 1765 | extern void __cleanup_signal(struct signal_struct *); |
a7e5328a | 1766 | extern void __cleanup_sighand(struct sighand_struct *); |
1da177e4 LT |
1767 | extern void exit_itimers(struct signal_struct *); |
1768 | ||
1769 | extern NORET_TYPE void do_group_exit(int); | |
1770 | ||
1da177e4 LT |
1771 | extern void daemonize(const char *, ...); |
1772 | extern int allow_signal(int); | |
1773 | extern int disallow_signal(int); | |
1da177e4 LT |
1774 | |
1775 | extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *); | |
1776 | extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *); | |
36c8b586 | 1777 | struct task_struct *fork_idle(int); |
1da177e4 LT |
1778 | |
1779 | extern void set_task_comm(struct task_struct *tsk, char *from); | |
59714d65 | 1780 | extern char *get_task_comm(char *to, struct task_struct *tsk); |
1da177e4 LT |
1781 | |
1782 | #ifdef CONFIG_SMP | |
36c8b586 | 1783 | extern void wait_task_inactive(struct task_struct * p); |
1da177e4 LT |
1784 | #else |
1785 | #define wait_task_inactive(p) do { } while (0) | |
1786 | #endif | |
1787 | ||
1788 | #define remove_parent(p) list_del_init(&(p)->sibling) | |
8fafabd8 | 1789 | #define add_parent(p) list_add_tail(&(p)->sibling,&(p)->parent->children) |
1da177e4 | 1790 | |
5e85d4ab | 1791 | #define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks) |
1da177e4 LT |
1792 | |
1793 | #define for_each_process(p) \ | |
1794 | for (p = &init_task ; (p = next_task(p)) != &init_task ; ) | |
1795 | ||
1796 | /* | |
1797 | * Careful: do_each_thread/while_each_thread is a double loop so | |
1798 | * 'break' will not work as expected - use goto instead. | |
1799 | */ | |
1800 | #define do_each_thread(g, t) \ | |
1801 | for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do | |
1802 | ||
1803 | #define while_each_thread(g, t) \ | |
1804 | while ((t = next_thread(t)) != g) | |
1805 | ||
de12a787 EB |
1806 | /* de_thread depends on thread_group_leader not being a pid based check */ |
1807 | #define thread_group_leader(p) (p == p->group_leader) | |
1da177e4 | 1808 | |
0804ef4b EB |
1809 | /* Do to the insanities of de_thread it is possible for a process |
1810 | * to have the pid of the thread group leader without actually being | |
1811 | * the thread group leader. For iteration through the pids in proc | |
1812 | * all we care about is that we have a task with the appropriate | |
1813 | * pid, we don't actually care if we have the right task. | |
1814 | */ | |
e868171a | 1815 | static inline int has_group_leader_pid(struct task_struct *p) |
0804ef4b EB |
1816 | { |
1817 | return p->pid == p->tgid; | |
1818 | } | |
1819 | ||
bac0abd6 PE |
1820 | static inline |
1821 | int same_thread_group(struct task_struct *p1, struct task_struct *p2) | |
1822 | { | |
1823 | return p1->tgid == p2->tgid; | |
1824 | } | |
1825 | ||
36c8b586 | 1826 | static inline struct task_struct *next_thread(const struct task_struct *p) |
47e65328 ON |
1827 | { |
1828 | return list_entry(rcu_dereference(p->thread_group.next), | |
36c8b586 | 1829 | struct task_struct, thread_group); |
47e65328 ON |
1830 | } |
1831 | ||
e868171a | 1832 | static inline int thread_group_empty(struct task_struct *p) |
1da177e4 | 1833 | { |
47e65328 | 1834 | return list_empty(&p->thread_group); |
1da177e4 LT |
1835 | } |
1836 | ||
1837 | #define delay_group_leader(p) \ | |
1838 | (thread_group_leader(p) && !thread_group_empty(p)) | |
1839 | ||
1da177e4 | 1840 | /* |
260ea101 | 1841 | * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring |
22e2c507 | 1842 | * subscriptions and synchronises with wait4(). Also used in procfs. Also |
ddbcc7e8 PM |
1843 | * pins the final release of task.io_context. Also protects ->cpuset and |
1844 | * ->cgroup.subsys[]. | |
1da177e4 LT |
1845 | * |
1846 | * Nests both inside and outside of read_lock(&tasklist_lock). | |
1847 | * It must not be nested with write_lock_irq(&tasklist_lock), | |
1848 | * neither inside nor outside. | |
1849 | */ | |
1850 | static inline void task_lock(struct task_struct *p) | |
1851 | { | |
1852 | spin_lock(&p->alloc_lock); | |
1853 | } | |
1854 | ||
1855 | static inline void task_unlock(struct task_struct *p) | |
1856 | { | |
1857 | spin_unlock(&p->alloc_lock); | |
1858 | } | |
1859 | ||
f63ee72e ON |
1860 | extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk, |
1861 | unsigned long *flags); | |
1862 | ||
1863 | static inline void unlock_task_sighand(struct task_struct *tsk, | |
1864 | unsigned long *flags) | |
1865 | { | |
1866 | spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); | |
1867 | } | |
1868 | ||
f037360f AV |
1869 | #ifndef __HAVE_THREAD_FUNCTIONS |
1870 | ||
f7e4217b RZ |
1871 | #define task_thread_info(task) ((struct thread_info *)(task)->stack) |
1872 | #define task_stack_page(task) ((task)->stack) | |
a1261f54 | 1873 | |
10ebffde AV |
1874 | static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) |
1875 | { | |
1876 | *task_thread_info(p) = *task_thread_info(org); | |
1877 | task_thread_info(p)->task = p; | |
1878 | } | |
1879 | ||
1880 | static inline unsigned long *end_of_stack(struct task_struct *p) | |
1881 | { | |
f7e4217b | 1882 | return (unsigned long *)(task_thread_info(p) + 1); |
10ebffde AV |
1883 | } |
1884 | ||
f037360f AV |
1885 | #endif |
1886 | ||
1da177e4 LT |
1887 | /* set thread flags in other task's structures |
1888 | * - see asm/thread_info.h for TIF_xxxx flags available | |
1889 | */ | |
1890 | static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1891 | { | |
a1261f54 | 1892 | set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1893 | } |
1894 | ||
1895 | static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1896 | { | |
a1261f54 | 1897 | clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1898 | } |
1899 | ||
1900 | static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1901 | { | |
a1261f54 | 1902 | return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1903 | } |
1904 | ||
1905 | static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1906 | { | |
a1261f54 | 1907 | return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1908 | } |
1909 | ||
1910 | static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1911 | { | |
a1261f54 | 1912 | return test_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1913 | } |
1914 | ||
1915 | static inline void set_tsk_need_resched(struct task_struct *tsk) | |
1916 | { | |
1917 | set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
1918 | } | |
1919 | ||
1920 | static inline void clear_tsk_need_resched(struct task_struct *tsk) | |
1921 | { | |
1922 | clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
1923 | } | |
1924 | ||
1925 | static inline int signal_pending(struct task_struct *p) | |
1926 | { | |
1927 | return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); | |
1928 | } | |
f776d12d MW |
1929 | |
1930 | extern int FASTCALL(__fatal_signal_pending(struct task_struct *p)); | |
1931 | ||
1932 | static inline int fatal_signal_pending(struct task_struct *p) | |
1933 | { | |
1934 | return signal_pending(p) && __fatal_signal_pending(p); | |
1935 | } | |
1936 | ||
1da177e4 LT |
1937 | static inline int need_resched(void) |
1938 | { | |
1939 | return unlikely(test_thread_flag(TIF_NEED_RESCHED)); | |
1940 | } | |
1941 | ||
1942 | /* | |
1943 | * cond_resched() and cond_resched_lock(): latency reduction via | |
1944 | * explicit rescheduling in places that are safe. The return | |
1945 | * value indicates whether a reschedule was done in fact. | |
1946 | * cond_resched_lock() will drop the spinlock before scheduling, | |
1947 | * cond_resched_softirq() will enable bhs before scheduling. | |
1948 | */ | |
02b67cc3 HX |
1949 | #ifdef CONFIG_PREEMPT |
1950 | static inline int cond_resched(void) | |
1951 | { | |
1952 | return 0; | |
1953 | } | |
1954 | #else | |
1955 | extern int _cond_resched(void); | |
1956 | static inline int cond_resched(void) | |
1957 | { | |
1958 | return _cond_resched(); | |
1959 | } | |
1960 | #endif | |
1da177e4 LT |
1961 | extern int cond_resched_lock(spinlock_t * lock); |
1962 | extern int cond_resched_softirq(void); | |
1963 | ||
1964 | /* | |
1965 | * Does a critical section need to be broken due to another | |
95c354fe NP |
1966 | * task waiting?: (technically does not depend on CONFIG_PREEMPT, |
1967 | * but a general need for low latency) | |
1da177e4 | 1968 | */ |
95c354fe | 1969 | static inline int spin_needbreak(spinlock_t *lock) |
1da177e4 | 1970 | { |
95c354fe NP |
1971 | #ifdef CONFIG_PREEMPT |
1972 | return spin_is_contended(lock); | |
1973 | #else | |
1da177e4 | 1974 | return 0; |
95c354fe | 1975 | #endif |
1da177e4 LT |
1976 | } |
1977 | ||
7bb44ade RM |
1978 | /* |
1979 | * Reevaluate whether the task has signals pending delivery. | |
1980 | * Wake the task if so. | |
1981 | * This is required every time the blocked sigset_t changes. | |
1982 | * callers must hold sighand->siglock. | |
1983 | */ | |
1984 | extern void recalc_sigpending_and_wake(struct task_struct *t); | |
1da177e4 LT |
1985 | extern void recalc_sigpending(void); |
1986 | ||
1987 | extern void signal_wake_up(struct task_struct *t, int resume_stopped); | |
1988 | ||
1989 | /* | |
1990 | * Wrappers for p->thread_info->cpu access. No-op on UP. | |
1991 | */ | |
1992 | #ifdef CONFIG_SMP | |
1993 | ||
1994 | static inline unsigned int task_cpu(const struct task_struct *p) | |
1995 | { | |
a1261f54 | 1996 | return task_thread_info(p)->cpu; |
1da177e4 LT |
1997 | } |
1998 | ||
c65cc870 | 1999 | extern void set_task_cpu(struct task_struct *p, unsigned int cpu); |
1da177e4 LT |
2000 | |
2001 | #else | |
2002 | ||
2003 | static inline unsigned int task_cpu(const struct task_struct *p) | |
2004 | { | |
2005 | return 0; | |
2006 | } | |
2007 | ||
2008 | static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) | |
2009 | { | |
2010 | } | |
2011 | ||
2012 | #endif /* CONFIG_SMP */ | |
2013 | ||
2014 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
2015 | extern void arch_pick_mmap_layout(struct mm_struct *mm); | |
2016 | #else | |
2017 | static inline void arch_pick_mmap_layout(struct mm_struct *mm) | |
2018 | { | |
2019 | mm->mmap_base = TASK_UNMAPPED_BASE; | |
2020 | mm->get_unmapped_area = arch_get_unmapped_area; | |
2021 | mm->unmap_area = arch_unmap_area; | |
2022 | } | |
2023 | #endif | |
2024 | ||
2025 | extern long sched_setaffinity(pid_t pid, cpumask_t new_mask); | |
2026 | extern long sched_getaffinity(pid_t pid, cpumask_t *mask); | |
2027 | ||
5c45bf27 | 2028 | extern int sched_mc_power_savings, sched_smt_power_savings; |
5c45bf27 | 2029 | |
1da177e4 LT |
2030 | extern void normalize_rt_tasks(void); |
2031 | ||
9b5b7751 SV |
2032 | #ifdef CONFIG_FAIR_GROUP_SCHED |
2033 | ||
4cf86d77 | 2034 | extern struct task_group init_task_group; |
9b5b7751 | 2035 | |
4cf86d77 IM |
2036 | extern struct task_group *sched_create_group(void); |
2037 | extern void sched_destroy_group(struct task_group *tg); | |
9b5b7751 | 2038 | extern void sched_move_task(struct task_struct *tsk); |
4cf86d77 | 2039 | extern int sched_group_set_shares(struct task_group *tg, unsigned long shares); |
5cb350ba | 2040 | extern unsigned long sched_group_shares(struct task_group *tg); |
9b5b7751 SV |
2041 | |
2042 | #endif | |
2043 | ||
4b98d11b AD |
2044 | #ifdef CONFIG_TASK_XACCT |
2045 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) | |
2046 | { | |
2047 | tsk->rchar += amt; | |
2048 | } | |
2049 | ||
2050 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) | |
2051 | { | |
2052 | tsk->wchar += amt; | |
2053 | } | |
2054 | ||
2055 | static inline void inc_syscr(struct task_struct *tsk) | |
2056 | { | |
2057 | tsk->syscr++; | |
2058 | } | |
2059 | ||
2060 | static inline void inc_syscw(struct task_struct *tsk) | |
2061 | { | |
2062 | tsk->syscw++; | |
2063 | } | |
2064 | #else | |
2065 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) | |
2066 | { | |
2067 | } | |
2068 | ||
2069 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) | |
2070 | { | |
2071 | } | |
2072 | ||
2073 | static inline void inc_syscr(struct task_struct *tsk) | |
2074 | { | |
2075 | } | |
2076 | ||
2077 | static inline void inc_syscw(struct task_struct *tsk) | |
2078 | { | |
2079 | } | |
2080 | #endif | |
2081 | ||
e6fe6649 AB |
2082 | #ifdef CONFIG_SMP |
2083 | void migration_init(void); | |
2084 | #else | |
2085 | static inline void migration_init(void) | |
2086 | { | |
2087 | } | |
2088 | #endif | |
2089 | ||
82455257 DH |
2090 | #ifndef TASK_SIZE_OF |
2091 | #define TASK_SIZE_OF(tsk) TASK_SIZE | |
2092 | #endif | |
2093 | ||
1da177e4 LT |
2094 | #endif /* __KERNEL__ */ |
2095 | ||
2096 | #endif |