1/* 2 * linux/fs/proc/array.c 3 * 4 * Copyright (C) 1992 by Linus Torvalds 5 * based on ideas by Darren Senn 6 * 7 * Fixes: 8 * Michael. K. Johnson: stat,statm extensions. 9 * <johnsonm@stolaf.edu> 10 * 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> 16 * 17 * Danny ter Haar : added cpuinfo 18 * <dth@cistron.nl> 19 * 20 * Alessandro Rubini : profile extension. 21 * <rubini@ipvvis.unipv.it> 22 * 23 * Jeff Tranter : added BogoMips field to cpuinfo 24 * <Jeff_Tranter@Mitel.COM> 25 * 26 * Bruno Haible : remove 4K limit for the maps file 27 * <haible@ma2s2.mathematik.uni-karlsruhe.de> 28 * 29 * Yves Arrouye : remove removal of trailing spaces in get_array. 30 * <Yves.Arrouye@marin.fdn.fr> 31 * 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> 38 * 39 * aeb@cwi.nl : /proc/partitions 40 * 41 * 42 * Alan Cox : security fixes. 43 * <Alan.Cox@linux.org> 44 * 45 * Al Viro : safe handling of mm_struct 46 * 47 * Gerhard Wichert : added BIGMEM support 48 * Siemens AG <Gerhard.Wichert@pdb.siemens.de> 49 * 50 * Al Viro & Jeff Garzik : moved most of the thing into base.c and 51 * : proc_misc.c. The rest may eventually go into 52 * : base.c too. 53 */ 54 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> 66#include <linux/io.h> 67#include <linux/mm.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 81#include <asm/pgtable.h> 82#include <asm/processor.h> 83#include "internal.h" 84 85/* Gcc optimizes away "strlen(x)" for constant x */ 86#define ADDBUF(buffer, string) \ 87do { memcpy(buffer, string, strlen(string)); \ 88 buffer += strlen(string); } while (0) 89 90static inline char *task_name(struct task_struct *p, char *buf) 91{ 92 int i; 93 char *name; 94 char tcomm[sizeof(p->comm)]; 95 96 get_task_comm(tcomm, p); 97 98 ADDBUF(buf, "Name:\t"); 99 name = tcomm; 100 i = sizeof(tcomm); 101 do { 102 unsigned char c = *name; 103 name++; 104 i--; 105 *buf = c; 106 if (!c) 107 break; 108 if (c == '\\') { 109 buf[1] = c; 110 buf += 2; 111 continue; 112 } 113 if (c == '\n') { 114 buf[0] = '\\'; 115 buf[1] = 'n'; 116 buf += 2; 117 continue; 118 } 119 buf++; 120 } while (i); 121 *buf = '\n'; 122 return buf+1; 123} 124 125/* 126 * The task state array is a strange "bitmap" of 127 * reasons to sleep. Thus "running" is zero, and 128 * you can test for combinations of others with 129 * simple bit tests. 130 */ 131static const char *task_state_array[] = { 132 "R (running)", /* 0 */ 133 "S (sleeping)", /* 1 */ 134 "D (disk sleep)", /* 2 */ 135 "T (stopped)", /* 4 */ 136 "T (tracing stop)", /* 8 */ 137 "Z (zombie)", /* 16 */ 138 "X (dead)" /* 32 */ 139}; 140 141static inline const char *get_task_state(struct task_struct *tsk) 142{ 143 unsigned int state = (tsk->state & (TASK_RUNNING | 144 TASK_INTERRUPTIBLE | 145 TASK_UNINTERRUPTIBLE | 146 TASK_STOPPED | 147 TASK_TRACED)) | 148 (tsk->exit_state & (EXIT_ZOMBIE | 149 EXIT_DEAD)); 150 const char **p = &task_state_array[0]; 151 152 while (state) { 153 p++; 154 state >>= 1; 155 } 156 return *p; 157} 158 159static inline char *task_state(struct task_struct *p, char *buffer) 160{ 161 struct group_info *group_info; 162 int g; 163 struct fdtable *fdt = NULL; 164 165 rcu_read_lock(); 166 buffer += sprintf(buffer, 167 "State:\t%s\n" 168 "Tgid:\t%d\n" 169 "Pid:\t%d\n" 170 "PPid:\t%d\n" 171 "TracerPid:\t%d\n" 172 "Uid:\t%d\t%d\t%d\t%d\n" 173 "Gid:\t%d\t%d\t%d\t%d\n", 174 get_task_state(p), 175 p->tgid, p->pid, 176 pid_alive(p) ? rcu_dereference(p->real_parent)->tgid : 0, 177 pid_alive(p) && p->ptrace ? rcu_dereference(p->parent)->pid : 0, 178 p->uid, p->euid, p->suid, p->fsuid, 179 p->gid, p->egid, p->sgid, p->fsgid); 180 181 task_lock(p); 182 if (p->files) 183 fdt = files_fdtable(p->files); 184 buffer += sprintf(buffer, 185 "FDSize:\t%d\n" 186 "Groups:\t", 187 fdt ? fdt->max_fds : 0); 188 rcu_read_unlock(); 189 190 group_info = p->group_info; 191 get_group_info(group_info); 192 task_unlock(p); 193 194 for (g = 0; g < min(group_info->ngroups, NGROUPS_SMALL); g++) 195 buffer += sprintf(buffer, "%d ", GROUP_AT(group_info, g)); 196 put_group_info(group_info); 197 198 buffer += sprintf(buffer, "\n"); 199 return buffer; 200} 201 202static char *render_sigset_t(const char *header, sigset_t *set, char *buffer) 203{ 204 int i, len; 205 206 len = strlen(header); 207 memcpy(buffer, header, len); 208 buffer += len; 209 210 i = _NSIG; 211 do { 212 int x = 0; 213 214 i -= 4; 215 if (sigismember(set, i+1)) x |= 1; 216 if (sigismember(set, i+2)) x |= 2; 217 if (sigismember(set, i+3)) x |= 4; 218 if (sigismember(set, i+4)) x |= 8; 219 *buffer++ = (x < 10 ? '0' : 'a' - 10) + x; 220 } while (i >= 4); 221 222 *buffer++ = '\n'; 223 *buffer = 0; 224 return buffer; 225} 226 227static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign, 228 sigset_t *catch) 229{ 230 struct k_sigaction *k; 231 int i; 232 233 k = p->sighand->action; 234 for (i = 1; i <= _NSIG; ++i, ++k) { 235 if (k->sa.sa_handler == SIG_IGN) 236 sigaddset(ign, i); 237 else if (k->sa.sa_handler != SIG_DFL) 238 sigaddset(catch, i); 239 } 240} 241 242static inline char *task_sig(struct task_struct *p, char *buffer) 243{ 244 unsigned long flags; 245 sigset_t pending, shpending, blocked, ignored, caught; 246 int num_threads = 0; 247 unsigned long qsize = 0; 248 unsigned long qlim = 0; 249 250 sigemptyset(&pending); 251 sigemptyset(&shpending); 252 sigemptyset(&blocked); 253 sigemptyset(&ignored); 254 sigemptyset(&caught); 255 256 rcu_read_lock(); 257 if (lock_task_sighand(p, &flags)) { 258 pending = p->pending.signal; 259 shpending = p->signal->shared_pending.signal; 260 blocked = p->blocked; 261 collect_sigign_sigcatch(p, &ignored, &caught); 262 num_threads = atomic_read(&p->signal->count); 263 qsize = atomic_read(&p->user->sigpending); 264 qlim = p->signal->rlim[RLIMIT_SIGPENDING].rlim_cur; 265 unlock_task_sighand(p, &flags); 266 } 267 rcu_read_unlock(); 268 269 buffer += sprintf(buffer, "Threads:\t%d\n", num_threads); 270 buffer += sprintf(buffer, "SigQ:\t%lu/%lu\n", qsize, qlim); 271 272 /* render them all */ 273 buffer = render_sigset_t("SigPnd:\t", &pending, buffer); 274 buffer = render_sigset_t("ShdPnd:\t", &shpending, buffer); 275 buffer = render_sigset_t("SigBlk:\t", &blocked, buffer); 276 buffer = render_sigset_t("SigIgn:\t", &ignored, buffer); 277 buffer = render_sigset_t("SigCgt:\t", &caught, buffer); 278 279 return buffer; 280} 281 282static inline char *task_cap(struct task_struct *p, char *buffer) 283{ 284 return buffer + sprintf(buffer, "CapInh:\t%016x\n" 285 "CapPrm:\t%016x\n" 286 "CapEff:\t%016x\n", 287 cap_t(p->cap_inheritable), 288 cap_t(p->cap_permitted), 289 cap_t(p->cap_effective)); 290} 291 292static inline char *task_context_switch_counts(struct task_struct *p, 293 char *buffer) 294{ 295 return buffer + sprintf(buffer, "voluntary_ctxt_switches:\t%lu\n" 296 "nonvoluntary_ctxt_switches:\t%lu\n", 297 p->nvcsw, 298 p->nivcsw); 299} 300 301int proc_pid_status(struct task_struct *task, char *buffer) 302{ 303 char *orig = buffer; 304 struct mm_struct *mm = get_task_mm(task); 305 306 buffer = task_name(task, buffer); 307 buffer = task_state(task, buffer); 308 309 if (mm) { 310 buffer = task_mem(mm, buffer); 311 mmput(mm); 312 } 313 buffer = task_sig(task, buffer); 314 buffer = task_cap(task, buffer); 315 buffer = cpuset_task_status_allowed(task, buffer); 316#if defined(CONFIG_S390) 317 buffer = task_show_regs(task, buffer); 318#endif 319 buffer = task_context_switch_counts(task, buffer); 320 return buffer - orig; 321} 322 323/* 324 * Use precise platform statistics if available: 325 */ 326#ifdef CONFIG_VIRT_CPU_ACCOUNTING 327static cputime_t task_utime(struct task_struct *p) 328{ 329 return p->utime; 330} 331 332static cputime_t task_stime(struct task_struct *p) 333{ 334 return p->stime; 335} 336#else 337static cputime_t task_utime(struct task_struct *p) 338{ 339 clock_t utime = cputime_to_clock_t(p->utime), 340 total = utime + cputime_to_clock_t(p->stime); 341 u64 temp; 342 343 /* 344 * Use CFS's precise accounting: 345 */ 346 temp = (u64)nsec_to_clock_t(p->se.sum_exec_runtime); 347 348 if (total) { 349 temp *= utime; 350 do_div(temp, total); 351 } 352 utime = (clock_t)temp; 353 354 p->prev_utime = max(p->prev_utime, clock_t_to_cputime(utime)); 355 return p->prev_utime; 356} 357 358static cputime_t task_stime(struct task_struct *p) 359{ 360 clock_t stime; 361 362 /* 363 * Use CFS's precise accounting. (we subtract utime from 364 * the total, to make sure the total observed by userspace 365 * grows monotonically - apps rely on that): 366 */ 367 stime = nsec_to_clock_t(p->se.sum_exec_runtime) - 368 cputime_to_clock_t(task_utime(p)); 369 370 if (stime >= 0) 371 p->prev_stime = max(p->prev_stime, clock_t_to_cputime(stime)); 372 373 return p->prev_stime; 374} 375#endif 376 377static cputime_t task_gtime(struct task_struct *p) 378{ 379 return p->gtime; 380} 381 382static int do_task_stat(struct task_struct *task, char *buffer, int whole) 383{ 384 unsigned long vsize, eip, esp, wchan = ~0UL; 385 long priority, nice; 386 int tty_pgrp = -1, tty_nr = 0; 387 sigset_t sigign, sigcatch; 388 char state; 389 int res; 390 pid_t ppid = 0, pgid = -1, sid = -1; 391 int num_threads = 0; 392 struct mm_struct *mm; 393 unsigned long long start_time; 394 unsigned long cmin_flt = 0, cmaj_flt = 0; 395 unsigned long min_flt = 0, maj_flt = 0; 396 cputime_t cutime, cstime, utime, stime; 397 cputime_t cgtime, gtime; 398 unsigned long rsslim = 0; 399 char tcomm[sizeof(task->comm)]; 400 unsigned long flags; 401 402 state = *get_task_state(task); 403 vsize = eip = esp = 0; 404 mm = get_task_mm(task); 405 if (mm) { 406 vsize = task_vsize(mm); 407 eip = KSTK_EIP(task); 408 esp = KSTK_ESP(task); 409 } 410 411 get_task_comm(tcomm, task); 412 413 sigemptyset(&sigign); 414 sigemptyset(&sigcatch); 415 cutime = cstime = utime = stime = cputime_zero; 416 cgtime = gtime = cputime_zero; 417 418 rcu_read_lock(); 419 if (lock_task_sighand(task, &flags)) { 420 struct signal_struct *sig = task->signal; 421 422 if (sig->tty) { 423 tty_pgrp = pid_nr(sig->tty->pgrp); 424 tty_nr = new_encode_dev(tty_devnum(sig->tty)); 425 } 426 427 num_threads = atomic_read(&sig->count); 428 collect_sigign_sigcatch(task, &sigign, &sigcatch); 429 430 cmin_flt = sig->cmin_flt; 431 cmaj_flt = sig->cmaj_flt; 432 cutime = sig->cutime; 433 cstime = sig->cstime; 434 cgtime = sig->cgtime; 435 rsslim = sig->rlim[RLIMIT_RSS].rlim_cur; 436 437 /* add up live thread stats at the group level */ 438 if (whole) { 439 struct task_struct *t = task; 440 do { 441 min_flt += t->min_flt; 442 maj_flt += t->maj_flt; 443 utime = cputime_add(utime, task_utime(t)); 444 stime = cputime_add(stime, task_stime(t)); 445 gtime = cputime_add(gtime, task_gtime(t)); 446 t = next_thread(t); 447 } while (t != task); 448 449 min_flt += sig->min_flt; 450 maj_flt += sig->maj_flt; 451 utime = cputime_add(utime, sig->utime); 452 stime = cputime_add(stime, sig->stime); 453 gtime = cputime_add(gtime, sig->gtime); 454 } 455 456 sid = signal_session(sig); 457 pgid = process_group(task); 458 ppid = rcu_dereference(task->real_parent)->tgid; 459 460 unlock_task_sighand(task, &flags); 461 } 462 rcu_read_unlock(); 463 464 if (!whole || num_threads < 2) 465 wchan = get_wchan(task); 466 if (!whole) { 467 min_flt = task->min_flt; 468 maj_flt = task->maj_flt; 469 utime = task_utime(task); 470 stime = task_stime(task); 471 gtime = task_gtime(task); 472 } 473 474 /* scale priority and nice values from timeslices to -20..20 */ 475 /* to make it look like a "normal" Unix priority/nice value */ 476 priority = task_prio(task); 477 nice = task_nice(task); 478 479 /* Temporary variable needed for gcc-2.96 */ 480 /* convert timespec -> nsec*/ 481 start_time = 482 (unsigned long long)task->start_time.tv_sec * NSEC_PER_SEC 483 + task->start_time.tv_nsec; 484 /* convert nsec -> ticks */ 485 start_time = nsec_to_clock_t(start_time); 486 487 res = sprintf(buffer, "%d (%s) %c %d %d %d %d %d %u %lu \ 488%lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \ 489%lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu %lu %ld\n", 490 task->pid, 491 tcomm, 492 state, 493 ppid, 494 pgid, 495 sid, 496 tty_nr, 497 tty_pgrp, 498 task->flags, 499 min_flt, 500 cmin_flt, 501 maj_flt, 502 cmaj_flt, 503 cputime_to_clock_t(utime), 504 cputime_to_clock_t(stime), 505 cputime_to_clock_t(cutime), 506 cputime_to_clock_t(cstime), 507 priority, 508 nice, 509 num_threads, 510 start_time, 511 vsize, 512 mm ? get_mm_rss(mm) : 0, 513 rsslim, 514 mm ? mm->start_code : 0, 515 mm ? mm->end_code : 0, 516 mm ? mm->start_stack : 0, 517 esp, 518 eip, 519 /* The signal information here is obsolete. 520 * It must be decimal for Linux 2.0 compatibility. 521 * Use /proc/#/status for real-time signals. 522 */ 523 task->pending.signal.sig[0] & 0x7fffffffUL, 524 task->blocked.sig[0] & 0x7fffffffUL, 525 sigign .sig[0] & 0x7fffffffUL, 526 sigcatch .sig[0] & 0x7fffffffUL, 527 wchan, 528 0UL, 529 0UL, 530 task->exit_signal, 531 task_cpu(task), 532 task->rt_priority, 533 task->policy, 534 (unsigned long long)delayacct_blkio_ticks(task), 535 cputime_to_clock_t(gtime), 536 cputime_to_clock_t(cgtime)); 537 if (mm) 538 mmput(mm); 539 return res; 540} 541 542int proc_tid_stat(struct task_struct *task, char *buffer) 543{ 544 return do_task_stat(task, buffer, 0); 545} 546 547int proc_tgid_stat(struct task_struct *task, char *buffer) 548{ 549 return do_task_stat(task, buffer, 1); 550} 551 552int proc_pid_statm(struct task_struct *task, char *buffer) 553{ 554 int size = 0, resident = 0, shared = 0, text = 0, lib = 0, data = 0; 555 struct mm_struct *mm = get_task_mm(task); 556 557 if (mm) { 558 size = task_statm(mm, &shared, &text, &data, &resident); 559 mmput(mm); 560 } 561 562 return sprintf(buffer, "%d %d %d %d %d %d %d\n", 563 size, resident, shared, text, lib, data, 0); 564} 565