2 * linux/fs/proc/array.c
4 * Copyright (C) 1992 by Linus Torvalds
5 * based on ideas by Darren Senn
8 * Michael. K. Johnson: stat,statm extensions.
9 * <johnsonm@stolaf.edu>
11 * Pauline Middelink : Made cmdline,envline only break at '\0's, to
12 * make sure SET_PROCTITLE works. Also removed
13 * bad '!' which forced address recalculation for
14 * EVERY character on the current page.
15 * <middelin@polyware.iaf.nl>
17 * Danny ter Haar : added cpuinfo
20 * Alessandro Rubini : profile extension.
21 * <rubini@ipvvis.unipv.it>
23 * Jeff Tranter : added BogoMips field to cpuinfo
24 * <Jeff_Tranter@Mitel.COM>
26 * Bruno Haible : remove 4K limit for the maps file
27 * <haible@ma2s2.mathematik.uni-karlsruhe.de>
29 * Yves Arrouye : remove removal of trailing spaces in get_array.
30 * <Yves.Arrouye@marin.fdn.fr>
32 * Jerome Forissier : added per-CPU time information to /proc/stat
33 * and /proc/<pid>/cpu extension
34 * <forissier@isia.cma.fr>
35 * - Incorporation and non-SMP safe operation
36 * of forissier patch in 2.1.78 by
37 * Hans Marcus <crowbar@concepts.nl>
39 * aeb@cwi.nl : /proc/partitions
42 * Alan Cox : security fixes.
43 * <Alan.Cox@linux.org>
45 * Al Viro : safe handling of mm_struct
47 * Gerhard Wichert : added BIGMEM support
48 * Siemens AG <Gerhard.Wichert@pdb.siemens.de>
50 * Al Viro & Jeff Garzik : moved most of the thing into base.c and
51 * : proc_misc.c. The rest may eventually go into
55 #include <linux/types.h>
56 #include <linux/errno.h>
57 #include <linux/time.h>
58 #include <linux/kernel.h>
59 #include <linux/kernel_stat.h>
60 #include <linux/tty.h>
61 #include <linux/string.h>
62 #include <linux/mman.h>
63 #include <linux/proc_fs.h>
64 #include <linux/ioport.h>
65 #include <linux/uaccess.h>
68 #include <linux/hugetlb.h>
69 #include <linux/pagemap.h>
70 #include <linux/swap.h>
71 #include <linux/slab.h>
72 #include <linux/smp.h>
73 #include <linux/signal.h>
74 #include <linux/highmem.h>
75 #include <linux/file.h>
76 #include <linux/times.h>
77 #include <linux/cpuset.h>
78 #include <linux/rcupdate.h>
79 #include <linux/delayacct.h>
80 #include <linux/seq_file.h>
81 #include <linux/pid_namespace.h>
83 #include <asm/pgtable.h>
84 #include <asm/processor.h>
87 /* Gcc optimizes away "strlen(x)" for constant x */
88 #define ADDBUF(buffer, string) \
89 do { memcpy(buffer, string, strlen(string)); \
90 buffer += strlen(string); } while (0)
92 static inline char *task_name(struct task_struct
*p
, char *buf
)
96 char tcomm
[sizeof(p
->comm
)];
98 get_task_comm(tcomm
, p
);
100 ADDBUF(buf
, "Name:\t");
104 unsigned char c
= *name
;
128 * The task state array is a strange "bitmap" of
129 * reasons to sleep. Thus "running" is zero, and
130 * you can test for combinations of others with
133 static const char *task_state_array
[] = {
134 "R (running)", /* 0 */
135 "S (sleeping)", /* 1 */
136 "D (disk sleep)", /* 2 */
137 "T (stopped)", /* 4 */
138 "T (tracing stop)", /* 8 */
139 "Z (zombie)", /* 16 */
143 static inline const char *get_task_state(struct task_struct
*tsk
)
145 unsigned int state
= (tsk
->state
& TASK_REPORT
) | tsk
->exit_state
;
146 const char **p
= &task_state_array
[0];
155 static inline char *task_state(struct task_struct
*p
, char *buffer
)
157 struct group_info
*group_info
;
159 struct fdtable
*fdt
= NULL
;
160 struct pid_namespace
*ns
;
163 ns
= current
->nsproxy
->pid_ns
;
165 ppid
= pid_alive(p
) ?
166 task_tgid_nr_ns(rcu_dereference(p
->real_parent
), ns
) : 0;
167 tpid
= pid_alive(p
) && p
->ptrace
?
168 task_pid_nr_ns(rcu_dereference(p
->parent
), ns
) : 0;
169 buffer
+= sprintf(buffer
,
175 "Uid:\t%d\t%d\t%d\t%d\n"
176 "Gid:\t%d\t%d\t%d\t%d\n",
178 task_tgid_nr_ns(p
, ns
),
179 task_pid_nr_ns(p
, ns
),
181 p
->uid
, p
->euid
, p
->suid
, p
->fsuid
,
182 p
->gid
, p
->egid
, p
->sgid
, p
->fsgid
);
186 fdt
= files_fdtable(p
->files
);
187 buffer
+= sprintf(buffer
,
190 fdt
? fdt
->max_fds
: 0);
193 group_info
= p
->group_info
;
194 get_group_info(group_info
);
197 for (g
= 0; g
< min(group_info
->ngroups
, NGROUPS_SMALL
); g
++)
198 buffer
+= sprintf(buffer
, "%d ", GROUP_AT(group_info
, g
));
199 put_group_info(group_info
);
201 buffer
+= sprintf(buffer
, "\n");
205 static char *render_sigset_t(const char *header
, sigset_t
*set
, char *buffer
)
209 len
= strlen(header
);
210 memcpy(buffer
, header
, len
);
218 if (sigismember(set
, i
+1)) x
|= 1;
219 if (sigismember(set
, i
+2)) x
|= 2;
220 if (sigismember(set
, i
+3)) x
|= 4;
221 if (sigismember(set
, i
+4)) x
|= 8;
222 *buffer
++ = (x
< 10 ? '0' : 'a' - 10) + x
;
230 static void collect_sigign_sigcatch(struct task_struct
*p
, sigset_t
*ign
,
233 struct k_sigaction
*k
;
236 k
= p
->sighand
->action
;
237 for (i
= 1; i
<= _NSIG
; ++i
, ++k
) {
238 if (k
->sa
.sa_handler
== SIG_IGN
)
240 else if (k
->sa
.sa_handler
!= SIG_DFL
)
245 static inline char *task_sig(struct task_struct
*p
, char *buffer
)
248 sigset_t pending
, shpending
, blocked
, ignored
, caught
;
250 unsigned long qsize
= 0;
251 unsigned long qlim
= 0;
253 sigemptyset(&pending
);
254 sigemptyset(&shpending
);
255 sigemptyset(&blocked
);
256 sigemptyset(&ignored
);
257 sigemptyset(&caught
);
260 if (lock_task_sighand(p
, &flags
)) {
261 pending
= p
->pending
.signal
;
262 shpending
= p
->signal
->shared_pending
.signal
;
263 blocked
= p
->blocked
;
264 collect_sigign_sigcatch(p
, &ignored
, &caught
);
265 num_threads
= atomic_read(&p
->signal
->count
);
266 qsize
= atomic_read(&p
->user
->sigpending
);
267 qlim
= p
->signal
->rlim
[RLIMIT_SIGPENDING
].rlim_cur
;
268 unlock_task_sighand(p
, &flags
);
272 buffer
+= sprintf(buffer
, "Threads:\t%d\n", num_threads
);
273 buffer
+= sprintf(buffer
, "SigQ:\t%lu/%lu\n", qsize
, qlim
);
275 /* render them all */
276 buffer
= render_sigset_t("SigPnd:\t", &pending
, buffer
);
277 buffer
= render_sigset_t("ShdPnd:\t", &shpending
, buffer
);
278 buffer
= render_sigset_t("SigBlk:\t", &blocked
, buffer
);
279 buffer
= render_sigset_t("SigIgn:\t", &ignored
, buffer
);
280 buffer
= render_sigset_t("SigCgt:\t", &caught
, buffer
);
285 static char *render_cap_t(const char *header
, kernel_cap_t
*a
, char *buffer
)
289 buffer
+= sprintf(buffer
, "%s", header
);
290 CAP_FOR_EACH_U32(__capi
) {
291 buffer
+= sprintf(buffer
, "%08x",
292 a
->cap
[(_LINUX_CAPABILITY_U32S
-1) - __capi
]);
294 return buffer
+ sprintf(buffer
, "\n");
297 static inline char *task_cap(struct task_struct
*p
, char *buffer
)
299 buffer
= render_cap_t("CapInh:\t", &p
->cap_inheritable
, buffer
);
300 buffer
= render_cap_t("CapPrm:\t", &p
->cap_permitted
, buffer
);
301 return render_cap_t("CapEff:\t", &p
->cap_effective
, buffer
);
304 static inline char *task_context_switch_counts(struct task_struct
*p
,
307 return buffer
+ sprintf(buffer
, "voluntary_ctxt_switches:\t%lu\n"
308 "nonvoluntary_ctxt_switches:\t%lu\n",
313 int proc_pid_status(struct task_struct
*task
, char *buffer
)
316 struct mm_struct
*mm
= get_task_mm(task
);
318 buffer
= task_name(task
, buffer
);
319 buffer
= task_state(task
, buffer
);
322 buffer
= task_mem(mm
, buffer
);
325 buffer
= task_sig(task
, buffer
);
326 buffer
= task_cap(task
, buffer
);
327 buffer
= cpuset_task_status_allowed(task
, buffer
);
328 #if defined(CONFIG_S390)
329 buffer
= task_show_regs(task
, buffer
);
331 buffer
= task_context_switch_counts(task
, buffer
);
332 return buffer
- orig
;
336 * Use precise platform statistics if available:
338 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
339 static cputime_t
task_utime(struct task_struct
*p
)
344 static cputime_t
task_stime(struct task_struct
*p
)
349 static cputime_t
task_utime(struct task_struct
*p
)
351 clock_t utime
= cputime_to_clock_t(p
->utime
),
352 total
= utime
+ cputime_to_clock_t(p
->stime
);
356 * Use CFS's precise accounting:
358 temp
= (u64
)nsec_to_clock_t(p
->se
.sum_exec_runtime
);
364 utime
= (clock_t)temp
;
366 p
->prev_utime
= max(p
->prev_utime
, clock_t_to_cputime(utime
));
367 return p
->prev_utime
;
370 static cputime_t
task_stime(struct task_struct
*p
)
375 * Use CFS's precise accounting. (we subtract utime from
376 * the total, to make sure the total observed by userspace
377 * grows monotonically - apps rely on that):
379 stime
= nsec_to_clock_t(p
->se
.sum_exec_runtime
) -
380 cputime_to_clock_t(task_utime(p
));
383 p
->prev_stime
= max(p
->prev_stime
, clock_t_to_cputime(stime
));
385 return p
->prev_stime
;
389 static cputime_t
task_gtime(struct task_struct
*p
)
394 static int do_task_stat(struct seq_file
*m
, struct pid_namespace
*ns
,
395 struct pid
*pid
, struct task_struct
*task
, int whole
)
397 unsigned long vsize
, eip
, esp
, wchan
= ~0UL;
399 int tty_pgrp
= -1, tty_nr
= 0;
400 sigset_t sigign
, sigcatch
;
402 pid_t ppid
= 0, pgid
= -1, sid
= -1;
404 struct mm_struct
*mm
;
405 unsigned long long start_time
;
406 unsigned long cmin_flt
= 0, cmaj_flt
= 0;
407 unsigned long min_flt
= 0, maj_flt
= 0;
408 cputime_t cutime
, cstime
, utime
, stime
;
409 cputime_t cgtime
, gtime
;
410 unsigned long rsslim
= 0;
411 char tcomm
[sizeof(task
->comm
)];
414 state
= *get_task_state(task
);
415 vsize
= eip
= esp
= 0;
416 mm
= get_task_mm(task
);
418 vsize
= task_vsize(mm
);
419 eip
= KSTK_EIP(task
);
420 esp
= KSTK_ESP(task
);
423 get_task_comm(tcomm
, task
);
425 sigemptyset(&sigign
);
426 sigemptyset(&sigcatch
);
427 cutime
= cstime
= utime
= stime
= cputime_zero
;
428 cgtime
= gtime
= cputime_zero
;
431 if (lock_task_sighand(task
, &flags
)) {
432 struct signal_struct
*sig
= task
->signal
;
435 tty_pgrp
= pid_nr_ns(sig
->tty
->pgrp
, ns
);
436 tty_nr
= new_encode_dev(tty_devnum(sig
->tty
));
439 num_threads
= atomic_read(&sig
->count
);
440 collect_sigign_sigcatch(task
, &sigign
, &sigcatch
);
442 cmin_flt
= sig
->cmin_flt
;
443 cmaj_flt
= sig
->cmaj_flt
;
444 cutime
= sig
->cutime
;
445 cstime
= sig
->cstime
;
446 cgtime
= sig
->cgtime
;
447 rsslim
= sig
->rlim
[RLIMIT_RSS
].rlim_cur
;
449 /* add up live thread stats at the group level */
451 struct task_struct
*t
= task
;
453 min_flt
+= t
->min_flt
;
454 maj_flt
+= t
->maj_flt
;
455 utime
= cputime_add(utime
, task_utime(t
));
456 stime
= cputime_add(stime
, task_stime(t
));
457 gtime
= cputime_add(gtime
, task_gtime(t
));
461 min_flt
+= sig
->min_flt
;
462 maj_flt
+= sig
->maj_flt
;
463 utime
= cputime_add(utime
, sig
->utime
);
464 stime
= cputime_add(stime
, sig
->stime
);
465 gtime
= cputime_add(gtime
, sig
->gtime
);
468 sid
= task_session_nr_ns(task
, ns
);
469 ppid
= task_tgid_nr_ns(task
->real_parent
, ns
);
470 pgid
= task_pgrp_nr_ns(task
, ns
);
472 unlock_task_sighand(task
, &flags
);
476 if (!whole
|| num_threads
< 2)
477 wchan
= get_wchan(task
);
479 min_flt
= task
->min_flt
;
480 maj_flt
= task
->maj_flt
;
481 utime
= task_utime(task
);
482 stime
= task_stime(task
);
483 gtime
= task_gtime(task
);
486 /* scale priority and nice values from timeslices to -20..20 */
487 /* to make it look like a "normal" Unix priority/nice value */
488 priority
= task_prio(task
);
489 nice
= task_nice(task
);
491 /* Temporary variable needed for gcc-2.96 */
492 /* convert timespec -> nsec*/
494 (unsigned long long)task
->real_start_time
.tv_sec
* NSEC_PER_SEC
495 + task
->real_start_time
.tv_nsec
;
496 /* convert nsec -> ticks */
497 start_time
= nsec_to_clock_t(start_time
);
499 seq_printf(m
, "%d (%s) %c %d %d %d %d %d %u %lu \
500 %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
501 %lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu %lu %ld\n",
515 cputime_to_clock_t(utime
),
516 cputime_to_clock_t(stime
),
517 cputime_to_clock_t(cutime
),
518 cputime_to_clock_t(cstime
),
524 mm
? get_mm_rss(mm
) : 0,
526 mm
? mm
->start_code
: 0,
527 mm
? mm
->end_code
: 0,
528 mm
? mm
->start_stack
: 0,
531 /* The signal information here is obsolete.
532 * It must be decimal for Linux 2.0 compatibility.
533 * Use /proc/#/status for real-time signals.
535 task
->pending
.signal
.sig
[0] & 0x7fffffffUL
,
536 task
->blocked
.sig
[0] & 0x7fffffffUL
,
537 sigign
.sig
[0] & 0x7fffffffUL
,
538 sigcatch
.sig
[0] & 0x7fffffffUL
,
546 (unsigned long long)delayacct_blkio_ticks(task
),
547 cputime_to_clock_t(gtime
),
548 cputime_to_clock_t(cgtime
));
554 int proc_tid_stat(struct seq_file
*m
, struct pid_namespace
*ns
,
555 struct pid
*pid
, struct task_struct
*task
)
557 return do_task_stat(m
, ns
, pid
, task
, 0);
560 int proc_tgid_stat(struct seq_file
*m
, struct pid_namespace
*ns
,
561 struct pid
*pid
, struct task_struct
*task
)
563 return do_task_stat(m
, ns
, pid
, task
, 1);
566 int proc_pid_statm(struct task_struct
*task
, char *buffer
)
568 int size
= 0, resident
= 0, shared
= 0, text
= 0, lib
= 0, data
= 0;
569 struct mm_struct
*mm
= get_task_mm(task
);
572 size
= task_statm(mm
, &shared
, &text
, &data
, &resident
);
576 return sprintf(buffer
, "%d %d %d %d %d %d %d\n",
577 size
, resident
, shared
, text
, lib
, data
, 0);
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