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@lxorguk.ukuu.org.uk>
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/fdtable.h>
77 #include <linux/times.h>
78 #include <linux/cpuset.h>
79 #include <linux/rcupdate.h>
80 #include <linux/delayacct.h>
81 #include <linux/seq_file.h>
82 #include <linux/pid_namespace.h>
83 #include <linux/ptrace.h>
84 #include <linux/tracehook.h>
85 #include <linux/swapops.h>
87 #include <asm/pgtable.h>
88 #include <asm/processor.h>
91 static inline void task_name(struct seq_file *m, struct task_struct *p)
96 char tcomm[sizeof(p->comm)];
98 get_task_comm(tcomm, p);
100 seq_printf(m, "Name:\t");
101 end = m->buf + m->size;
102 buf = m->buf + m->count;
105 while (i && (buf < end)) {
106 unsigned char c = *name;
126 m->count = buf - m->buf;
131 * The task state array is a strange "bitmap" of
132 * reasons to sleep. Thus "running" is zero, and
133 * you can test for combinations of others with
136 static const char *task_state_array[] = {
137 "R (running)", /* 0 */
138 "S (sleeping)", /* 1 */
139 "D (disk sleep)", /* 2 */
140 "T (stopped)", /* 4 */
141 "t (tracing stop)", /* 8 */
142 "Z (zombie)", /* 16 */
145 "K (wakekill)", /* 128 */
146 "W (waking)", /* 256 */
149 static inline const char *get_task_state(struct task_struct *tsk)
151 unsigned int state = (tsk->state & TASK_REPORT) | tsk->exit_state;
152 const char **p = &task_state_array[0];
154 BUILD_BUG_ON(1 + ilog2(TASK_STATE_MAX) != ARRAY_SIZE(task_state_array));
163 static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
164 struct pid *pid, struct task_struct *p)
166 struct group_info *group_info;
168 struct fdtable *fdt = NULL;
169 const struct cred *cred;
173 ppid = pid_alive(p) ?
174 task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0;
177 struct task_struct *tracer = tracehook_tracer_task(p);
179 tpid = task_pid_nr_ns(tracer, ns);
181 cred = get_cred((struct cred *) __task_cred(p));
188 "Uid:\t%d\t%d\t%d\t%d\n"
189 "Gid:\t%d\t%d\t%d\t%d\n",
191 task_tgid_nr_ns(p, ns),
194 cred->uid, cred->euid, cred->suid, cred->fsuid,
195 cred->gid, cred->egid, cred->sgid, cred->fsgid);
199 fdt = files_fdtable(p->files);
203 fdt ? fdt->max_fds : 0);
206 group_info = cred->group_info;
209 for (g = 0; g < min(group_info->ngroups, NGROUPS_SMALL); g++)
210 seq_printf(m, "%d ", GROUP_AT(group_info, g));
216 static void render_sigset_t(struct seq_file *m, const char *header,
221 seq_printf(m, "%s", header);
228 if (sigismember(set, i+1)) x |= 1;
229 if (sigismember(set, i+2)) x |= 2;
230 if (sigismember(set, i+3)) x |= 4;
231 if (sigismember(set, i+4)) x |= 8;
232 seq_printf(m, "%x", x);
238 static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,
241 struct k_sigaction *k;
244 k = p->sighand->action;
245 for (i = 1; i <= _NSIG; ++i, ++k) {
246 if (k->sa.sa_handler == SIG_IGN)
248 else if (k->sa.sa_handler != SIG_DFL)
253 static inline void task_sig(struct seq_file *m, struct task_struct *p)
256 sigset_t pending, shpending, blocked, ignored, caught;
258 unsigned long qsize = 0;
259 unsigned long qlim = 0;
261 sigemptyset(&pending);
262 sigemptyset(&shpending);
263 sigemptyset(&blocked);
264 sigemptyset(&ignored);
265 sigemptyset(&caught);
267 if (lock_task_sighand(p, &flags)) {
268 pending = p->pending.signal;
269 shpending = p->signal->shared_pending.signal;
270 blocked = p->blocked;
271 collect_sigign_sigcatch(p, &ignored, &caught);
272 num_threads = atomic_read(&p->signal->count);
273 qsize = atomic_read(&__task_cred(p)->user->sigpending);
274 qlim = p->signal->rlim[RLIMIT_SIGPENDING].rlim_cur;
275 unlock_task_sighand(p, &flags);
278 seq_printf(m, "Threads:\t%d\n", num_threads);
279 seq_printf(m, "SigQ:\t%lu/%lu\n", qsize, qlim);
281 /* render them all */
282 render_sigset_t(m, "SigPnd:\t", &pending);
283 render_sigset_t(m, "ShdPnd:\t", &shpending);
284 render_sigset_t(m, "SigBlk:\t", &blocked);
285 render_sigset_t(m, "SigIgn:\t", &ignored);
286 render_sigset_t(m, "SigCgt:\t", &caught);
289 static void render_cap_t(struct seq_file *m, const char *header,
294 seq_printf(m, "%s", header);
295 CAP_FOR_EACH_U32(__capi) {
296 seq_printf(m, "%08x",
297 a->cap[(_KERNEL_CAPABILITY_U32S-1) - __capi]);
302 static inline void task_cap(struct seq_file *m, struct task_struct *p)
304 const struct cred *cred;
305 kernel_cap_t cap_inheritable, cap_permitted, cap_effective, cap_bset;
308 cred = __task_cred(p);
309 cap_inheritable = cred->cap_inheritable;
310 cap_permitted = cred->cap_permitted;
311 cap_effective = cred->cap_effective;
312 cap_bset = cred->cap_bset;
315 render_cap_t(m, "CapInh:\t", &cap_inheritable);
316 render_cap_t(m, "CapPrm:\t", &cap_permitted);
317 render_cap_t(m, "CapEff:\t", &cap_effective);
318 render_cap_t(m, "CapBnd:\t", &cap_bset);
321 static inline void task_context_switch_counts(struct seq_file *m,
322 struct task_struct *p)
324 seq_printf(m, "voluntary_ctxt_switches:\t%lu\n"
325 "nonvoluntary_ctxt_switches:\t%lu\n",
333 struct vm_area_struct *vma;
334 unsigned long startpage;
338 static int stack_usage_pte_range(pmd_t *pmd, unsigned long addr,
339 unsigned long end, struct mm_walk *walk)
341 struct stack_stats *ss = walk->private;
342 struct vm_area_struct *vma = ss->vma;
347 pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
348 for (; addr != end; pte++, addr += PAGE_SIZE) {
351 #ifdef CONFIG_STACK_GROWSUP
352 if (pte_present(ptent) || is_swap_pte(ptent))
353 ss->usage = addr - ss->startpage + PAGE_SIZE;
355 if (pte_present(ptent) || is_swap_pte(ptent)) {
356 ss->usage = ss->startpage - addr + PAGE_SIZE;
363 pte_unmap_unlock(pte - 1, ptl);
368 static inline unsigned long get_stack_usage_in_bytes(struct vm_area_struct *vma,
369 struct task_struct *task)
371 struct stack_stats ss;
372 struct mm_walk stack_walk = {
373 .pmd_entry = stack_usage_pte_range,
378 if (!vma->vm_mm || is_vm_hugetlb_page(vma))
382 ss.startpage = task->stack_start & PAGE_MASK;
385 #ifdef CONFIG_STACK_GROWSUP
386 walk_page_range(KSTK_ESP(task) & PAGE_MASK, vma->vm_end,
389 walk_page_range(vma->vm_start, (KSTK_ESP(task) & PAGE_MASK) + PAGE_SIZE,
395 static inline void task_show_stack_usage(struct seq_file *m,
396 struct task_struct *task)
398 struct vm_area_struct *vma;
399 struct mm_struct *mm = get_task_mm(task);
402 down_read(&mm->mmap_sem);
403 vma = find_vma(mm, task->stack_start);
405 seq_printf(m, "Stack usage:\t%lu kB\n",
406 get_stack_usage_in_bytes(vma, task) >> 10);
408 up_read(&mm->mmap_sem);
413 static void task_show_stack_usage(struct seq_file *m, struct task_struct *task)
416 #endif /* CONFIG_MMU */
418 static void task_cpus_allowed(struct seq_file *m, struct task_struct *task)
420 seq_printf(m, "Cpus_allowed:\t");
421 seq_cpumask(m, &task->cpus_allowed);
423 seq_printf(m, "Cpus_allowed_list:\t");
424 seq_cpumask_list(m, &task->cpus_allowed);
428 int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
429 struct pid *pid, struct task_struct *task)
431 struct mm_struct *mm = get_task_mm(task);
434 task_state(m, ns, pid, task);
442 task_cpus_allowed(m, task);
443 cpuset_task_status_allowed(m, task);
444 #if defined(CONFIG_S390)
445 task_show_regs(m, task);
447 task_context_switch_counts(m, task);
448 task_show_stack_usage(m, task);
452 static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
453 struct pid *pid, struct task_struct *task, int whole)
455 unsigned long vsize, eip, esp, wchan = ~0UL;
457 int tty_pgrp = -1, tty_nr = 0;
458 sigset_t sigign, sigcatch;
460 pid_t ppid = 0, pgid = -1, sid = -1;
463 struct mm_struct *mm;
464 unsigned long long start_time;
465 unsigned long cmin_flt = 0, cmaj_flt = 0;
466 unsigned long min_flt = 0, maj_flt = 0;
467 cputime_t cutime, cstime, utime, stime;
468 cputime_t cgtime, gtime;
469 unsigned long rsslim = 0;
470 char tcomm[sizeof(task->comm)];
473 state = *get_task_state(task);
474 vsize = eip = esp = 0;
475 permitted = ptrace_may_access(task, PTRACE_MODE_READ);
476 mm = get_task_mm(task);
478 vsize = task_vsize(mm);
480 eip = KSTK_EIP(task);
481 esp = KSTK_ESP(task);
485 get_task_comm(tcomm, task);
487 sigemptyset(&sigign);
488 sigemptyset(&sigcatch);
489 cutime = cstime = utime = stime = cputime_zero;
490 cgtime = gtime = cputime_zero;
492 if (lock_task_sighand(task, &flags)) {
493 struct signal_struct *sig = task->signal;
496 struct pid *pgrp = tty_get_pgrp(sig->tty);
497 tty_pgrp = pid_nr_ns(pgrp, ns);
499 tty_nr = new_encode_dev(tty_devnum(sig->tty));
502 num_threads = atomic_read(&sig->count);
503 collect_sigign_sigcatch(task, &sigign, &sigcatch);
505 cmin_flt = sig->cmin_flt;
506 cmaj_flt = sig->cmaj_flt;
507 cutime = sig->cutime;
508 cstime = sig->cstime;
509 cgtime = sig->cgtime;
510 rsslim = sig->rlim[RLIMIT_RSS].rlim_cur;
512 /* add up live thread stats at the group level */
514 struct task_struct *t = task;
516 min_flt += t->min_flt;
517 maj_flt += t->maj_flt;
518 gtime = cputime_add(gtime, t->gtime);
522 min_flt += sig->min_flt;
523 maj_flt += sig->maj_flt;
524 thread_group_times(task, &utime, &stime);
525 gtime = cputime_add(gtime, sig->gtime);
528 sid = task_session_nr_ns(task, ns);
529 ppid = task_tgid_nr_ns(task->real_parent, ns);
530 pgid = task_pgrp_nr_ns(task, ns);
532 unlock_task_sighand(task, &flags);
535 if (permitted && (!whole || num_threads < 2))
536 wchan = get_wchan(task);
538 min_flt = task->min_flt;
539 maj_flt = task->maj_flt;
540 task_times(task, &utime, &stime);
544 /* scale priority and nice values from timeslices to -20..20 */
545 /* to make it look like a "normal" Unix priority/nice value */
546 priority = task_prio(task);
547 nice = task_nice(task);
549 /* Temporary variable needed for gcc-2.96 */
550 /* convert timespec -> nsec*/
552 (unsigned long long)task->real_start_time.tv_sec * NSEC_PER_SEC
553 + task->real_start_time.tv_nsec;
554 /* convert nsec -> ticks */
555 start_time = nsec_to_clock_t(start_time);
557 seq_printf(m, "%d (%s) %c %d %d %d %d %d %u %lu \
558 %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
559 %lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu %lu %ld\n",
573 cputime_to_clock_t(utime),
574 cputime_to_clock_t(stime),
575 cputime_to_clock_t(cutime),
576 cputime_to_clock_t(cstime),
582 mm ? get_mm_rss(mm) : 0,
584 mm ? mm->start_code : 0,
585 mm ? mm->end_code : 0,
586 (permitted && mm) ? task->stack_start : 0,
589 /* The signal information here is obsolete.
590 * It must be decimal for Linux 2.0 compatibility.
591 * Use /proc/#/status for real-time signals.
593 task->pending.signal.sig[0] & 0x7fffffffUL,
594 task->blocked.sig[0] & 0x7fffffffUL,
595 sigign .sig[0] & 0x7fffffffUL,
596 sigcatch .sig[0] & 0x7fffffffUL,
604 (unsigned long long)delayacct_blkio_ticks(task),
605 cputime_to_clock_t(gtime),
606 cputime_to_clock_t(cgtime));
612 int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
613 struct pid *pid, struct task_struct *task)
615 return do_task_stat(m, ns, pid, task, 0);
618 int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
619 struct pid *pid, struct task_struct *task)
621 return do_task_stat(m, ns, pid, task, 1);
624 int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
625 struct pid *pid, struct task_struct *task)
627 int size = 0, resident = 0, shared = 0, text = 0, lib = 0, data = 0;
628 struct mm_struct *mm = get_task_mm(task);
631 size = task_statm(mm, &shared, &text, &data, &resident);
634 seq_printf(m, "%d %d %d %d %d %d %d\n",
635 size, resident, shared, text, lib, data, 0);