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1da177e4 LT |
1 | /* |
2 | * linux/kernel/acct.c | |
3 | * | |
4 | * BSD Process Accounting for Linux | |
5 | * | |
6 | * Author: Marco van Wieringen <mvw@planets.elm.net> | |
7 | * | |
8 | * Some code based on ideas and code from: | |
9 | * Thomas K. Dyas <tdyas@eden.rutgers.edu> | |
10 | * | |
11 | * This file implements BSD-style process accounting. Whenever any | |
12 | * process exits, an accounting record of type "struct acct" is | |
13 | * written to the file specified with the acct() system call. It is | |
14 | * up to user-level programs to do useful things with the accounting | |
15 | * log. The kernel just provides the raw accounting information. | |
16 | * | |
17 | * (C) Copyright 1995 - 1997 Marco van Wieringen - ELM Consultancy B.V. | |
18 | * | |
19 | * Plugged two leaks. 1) It didn't return acct_file into the free_filps if | |
20 | * the file happened to be read-only. 2) If the accounting was suspended | |
21 | * due to the lack of space it happily allowed to reopen it and completely | |
22 | * lost the old acct_file. 3/10/98, Al Viro. | |
23 | * | |
24 | * Now we silently close acct_file on attempt to reopen. Cleaned sys_acct(). | |
25 | * XTerms and EMACS are manifestations of pure evil. 21/10/98, AV. | |
26 | * | |
27 | * Fixed a nasty interaction with with sys_umount(). If the accointing | |
28 | * was suspeneded we failed to stop it on umount(). Messy. | |
29 | * Another one: remount to readonly didn't stop accounting. | |
30 | * Question: what should we do if we have CAP_SYS_ADMIN but not | |
31 | * CAP_SYS_PACCT? Current code does the following: umount returns -EBUSY | |
32 | * unless we are messing with the root. In that case we are getting a | |
33 | * real mess with do_remount_sb(). 9/11/98, AV. | |
34 | * | |
35 | * Fixed a bunch of races (and pair of leaks). Probably not the best way, | |
36 | * but this one obviously doesn't introduce deadlocks. Later. BTW, found | |
37 | * one race (and leak) in BSD implementation. | |
38 | * OK, that's better. ANOTHER race and leak in BSD variant. There always | |
39 | * is one more bug... 10/11/98, AV. | |
40 | * | |
41 | * Oh, fsck... Oopsable SMP race in do_process_acct() - we must hold | |
42 | * ->mmap_sem to walk the vma list of current->mm. Nasty, since it leaks | |
43 | * a struct file opened for write. Fixed. 2/6/2000, AV. | |
44 | */ | |
45 | ||
46 | #include <linux/config.h> | |
47 | #include <linux/mm.h> | |
48 | #include <linux/slab.h> | |
49 | #include <linux/acct.h> | |
c59ede7b | 50 | #include <linux/capability.h> |
1da177e4 LT |
51 | #include <linux/file.h> |
52 | #include <linux/tty.h> | |
53 | #include <linux/security.h> | |
54 | #include <linux/vfs.h> | |
55 | #include <linux/jiffies.h> | |
56 | #include <linux/times.h> | |
57 | #include <linux/syscalls.h> | |
7b7b1ace | 58 | #include <linux/mount.h> |
1da177e4 LT |
59 | #include <asm/uaccess.h> |
60 | #include <asm/div64.h> | |
61 | #include <linux/blkdev.h> /* sector_div */ | |
62 | ||
63 | /* | |
64 | * These constants control the amount of freespace that suspend and | |
65 | * resume the process accounting system, and the time delay between | |
66 | * each check. | |
67 | * Turned into sysctl-controllable parameters. AV, 12/11/98 | |
68 | */ | |
69 | ||
70 | int acct_parm[3] = {4, 2, 30}; | |
71 | #define RESUME (acct_parm[0]) /* >foo% free space - resume */ | |
72 | #define SUSPEND (acct_parm[1]) /* <foo% free space - suspend */ | |
73 | #define ACCT_TIMEOUT (acct_parm[2]) /* foo second timeout between checks */ | |
74 | ||
75 | /* | |
76 | * External references and all of the globals. | |
77 | */ | |
78 | static void do_acct_process(long, struct file *); | |
79 | ||
80 | /* | |
81 | * This structure is used so that all the data protected by lock | |
82 | * can be placed in the same cache line as the lock. This primes | |
83 | * the cache line to have the data after getting the lock. | |
84 | */ | |
85 | struct acct_glbs { | |
86 | spinlock_t lock; | |
87 | volatile int active; | |
88 | volatile int needcheck; | |
89 | struct file *file; | |
90 | struct timer_list timer; | |
91 | }; | |
92 | ||
93 | static struct acct_glbs acct_globals __cacheline_aligned = {SPIN_LOCK_UNLOCKED}; | |
94 | ||
95 | /* | |
96 | * Called whenever the timer says to check the free space. | |
97 | */ | |
98 | static void acct_timeout(unsigned long unused) | |
99 | { | |
100 | acct_globals.needcheck = 1; | |
101 | } | |
102 | ||
103 | /* | |
104 | * Check the amount of free space and suspend/resume accordingly. | |
105 | */ | |
106 | static int check_free_space(struct file *file) | |
107 | { | |
108 | struct kstatfs sbuf; | |
109 | int res; | |
110 | int act; | |
111 | sector_t resume; | |
112 | sector_t suspend; | |
113 | ||
114 | spin_lock(&acct_globals.lock); | |
115 | res = acct_globals.active; | |
116 | if (!file || !acct_globals.needcheck) | |
117 | goto out; | |
118 | spin_unlock(&acct_globals.lock); | |
119 | ||
120 | /* May block */ | |
726c3342 | 121 | if (vfs_statfs(file->f_dentry, &sbuf)) |
1da177e4 LT |
122 | return res; |
123 | suspend = sbuf.f_blocks * SUSPEND; | |
124 | resume = sbuf.f_blocks * RESUME; | |
125 | ||
126 | sector_div(suspend, 100); | |
127 | sector_div(resume, 100); | |
128 | ||
129 | if (sbuf.f_bavail <= suspend) | |
130 | act = -1; | |
131 | else if (sbuf.f_bavail >= resume) | |
132 | act = 1; | |
133 | else | |
134 | act = 0; | |
135 | ||
136 | /* | |
137 | * If some joker switched acct_globals.file under us we'ld better be | |
138 | * silent and _not_ touch anything. | |
139 | */ | |
140 | spin_lock(&acct_globals.lock); | |
141 | if (file != acct_globals.file) { | |
142 | if (act) | |
143 | res = act>0; | |
144 | goto out; | |
145 | } | |
146 | ||
147 | if (acct_globals.active) { | |
148 | if (act < 0) { | |
149 | acct_globals.active = 0; | |
150 | printk(KERN_INFO "Process accounting paused\n"); | |
151 | } | |
152 | } else { | |
153 | if (act > 0) { | |
154 | acct_globals.active = 1; | |
155 | printk(KERN_INFO "Process accounting resumed\n"); | |
156 | } | |
157 | } | |
158 | ||
159 | del_timer(&acct_globals.timer); | |
160 | acct_globals.needcheck = 0; | |
161 | acct_globals.timer.expires = jiffies + ACCT_TIMEOUT*HZ; | |
162 | add_timer(&acct_globals.timer); | |
163 | res = acct_globals.active; | |
164 | out: | |
165 | spin_unlock(&acct_globals.lock); | |
166 | return res; | |
167 | } | |
168 | ||
169 | /* | |
417ef531 | 170 | * Close the old accounting file (if currently open) and then replace |
1da177e4 LT |
171 | * it with file (if non-NULL). |
172 | * | |
173 | * NOTE: acct_globals.lock MUST be held on entry and exit. | |
174 | */ | |
175 | static void acct_file_reopen(struct file *file) | |
176 | { | |
177 | struct file *old_acct = NULL; | |
178 | ||
179 | if (acct_globals.file) { | |
180 | old_acct = acct_globals.file; | |
181 | del_timer(&acct_globals.timer); | |
182 | acct_globals.active = 0; | |
183 | acct_globals.needcheck = 0; | |
184 | acct_globals.file = NULL; | |
185 | } | |
186 | if (file) { | |
187 | acct_globals.file = file; | |
188 | acct_globals.needcheck = 0; | |
189 | acct_globals.active = 1; | |
190 | /* It's been deleted if it was used before so this is safe */ | |
191 | init_timer(&acct_globals.timer); | |
192 | acct_globals.timer.function = acct_timeout; | |
193 | acct_globals.timer.expires = jiffies + ACCT_TIMEOUT*HZ; | |
194 | add_timer(&acct_globals.timer); | |
195 | } | |
196 | if (old_acct) { | |
7b7b1ace | 197 | mnt_unpin(old_acct->f_vfsmnt); |
1da177e4 LT |
198 | spin_unlock(&acct_globals.lock); |
199 | do_acct_process(0, old_acct); | |
200 | filp_close(old_acct, NULL); | |
201 | spin_lock(&acct_globals.lock); | |
202 | } | |
203 | } | |
204 | ||
7b7b1ace AV |
205 | static int acct_on(char *name) |
206 | { | |
207 | struct file *file; | |
208 | int error; | |
209 | ||
210 | /* Difference from BSD - they don't do O_APPEND */ | |
211 | file = filp_open(name, O_WRONLY|O_APPEND|O_LARGEFILE, 0); | |
212 | if (IS_ERR(file)) | |
213 | return PTR_ERR(file); | |
214 | ||
215 | if (!S_ISREG(file->f_dentry->d_inode->i_mode)) { | |
216 | filp_close(file, NULL); | |
217 | return -EACCES; | |
218 | } | |
219 | ||
220 | if (!file->f_op->write) { | |
221 | filp_close(file, NULL); | |
222 | return -EIO; | |
223 | } | |
224 | ||
225 | error = security_acct(file); | |
226 | if (error) { | |
227 | filp_close(file, NULL); | |
228 | return error; | |
229 | } | |
230 | ||
231 | spin_lock(&acct_globals.lock); | |
232 | mnt_pin(file->f_vfsmnt); | |
233 | acct_file_reopen(file); | |
234 | spin_unlock(&acct_globals.lock); | |
235 | ||
236 | mntput(file->f_vfsmnt); /* it's pinned, now give up active reference */ | |
237 | ||
238 | return 0; | |
239 | } | |
240 | ||
417ef531 RD |
241 | /** |
242 | * sys_acct - enable/disable process accounting | |
243 | * @name: file name for accounting records or NULL to shutdown accounting | |
244 | * | |
245 | * Returns 0 for success or negative errno values for failure. | |
246 | * | |
247 | * sys_acct() is the only system call needed to implement process | |
248 | * accounting. It takes the name of the file where accounting records | |
249 | * should be written. If the filename is NULL, accounting will be | |
250 | * shutdown. | |
1da177e4 LT |
251 | */ |
252 | asmlinkage long sys_acct(const char __user *name) | |
253 | { | |
1da177e4 LT |
254 | int error; |
255 | ||
256 | if (!capable(CAP_SYS_PACCT)) | |
257 | return -EPERM; | |
258 | ||
259 | if (name) { | |
7b7b1ace AV |
260 | char *tmp = getname(name); |
261 | if (IS_ERR(tmp)) | |
1da177e4 | 262 | return (PTR_ERR(tmp)); |
7b7b1ace | 263 | error = acct_on(tmp); |
1da177e4 | 264 | putname(tmp); |
7b7b1ace AV |
265 | } else { |
266 | error = security_acct(NULL); | |
267 | if (!error) { | |
268 | spin_lock(&acct_globals.lock); | |
269 | acct_file_reopen(NULL); | |
270 | spin_unlock(&acct_globals.lock); | |
1da177e4 LT |
271 | } |
272 | } | |
7b7b1ace AV |
273 | return error; |
274 | } | |
1da177e4 | 275 | |
7b7b1ace AV |
276 | /** |
277 | * acct_auto_close - turn off a filesystem's accounting if it is on | |
278 | * @m: vfsmount being shut down | |
279 | * | |
280 | * If the accounting is turned on for a file in the subtree pointed to | |
281 | * to by m, turn accounting off. Done when m is about to die. | |
282 | */ | |
283 | void acct_auto_close_mnt(struct vfsmount *m) | |
284 | { | |
1da177e4 | 285 | spin_lock(&acct_globals.lock); |
7b7b1ace AV |
286 | if (acct_globals.file && acct_globals.file->f_vfsmnt == m) |
287 | acct_file_reopen(NULL); | |
1da177e4 | 288 | spin_unlock(&acct_globals.lock); |
1da177e4 LT |
289 | } |
290 | ||
417ef531 RD |
291 | /** |
292 | * acct_auto_close - turn off a filesystem's accounting if it is on | |
293 | * @sb: super block for the filesystem | |
294 | * | |
295 | * If the accounting is turned on for a file in the filesystem pointed | |
296 | * to by sb, turn accounting off. | |
1da177e4 LT |
297 | */ |
298 | void acct_auto_close(struct super_block *sb) | |
299 | { | |
300 | spin_lock(&acct_globals.lock); | |
301 | if (acct_globals.file && | |
7b7b1ace AV |
302 | acct_globals.file->f_vfsmnt->mnt_sb == sb) { |
303 | acct_file_reopen(NULL); | |
1da177e4 LT |
304 | } |
305 | spin_unlock(&acct_globals.lock); | |
306 | } | |
307 | ||
308 | /* | |
309 | * encode an unsigned long into a comp_t | |
310 | * | |
311 | * This routine has been adopted from the encode_comp_t() function in | |
312 | * the kern_acct.c file of the FreeBSD operating system. The encoding | |
313 | * is a 13-bit fraction with a 3-bit (base 8) exponent. | |
314 | */ | |
315 | ||
316 | #define MANTSIZE 13 /* 13 bit mantissa. */ | |
317 | #define EXPSIZE 3 /* Base 8 (3 bit) exponent. */ | |
318 | #define MAXFRACT ((1 << MANTSIZE) - 1) /* Maximum fractional value. */ | |
319 | ||
320 | static comp_t encode_comp_t(unsigned long value) | |
321 | { | |
322 | int exp, rnd; | |
323 | ||
324 | exp = rnd = 0; | |
325 | while (value > MAXFRACT) { | |
326 | rnd = value & (1 << (EXPSIZE - 1)); /* Round up? */ | |
327 | value >>= EXPSIZE; /* Base 8 exponent == 3 bit shift. */ | |
328 | exp++; | |
329 | } | |
330 | ||
331 | /* | |
332 | * If we need to round up, do it (and handle overflow correctly). | |
333 | */ | |
334 | if (rnd && (++value > MAXFRACT)) { | |
335 | value >>= EXPSIZE; | |
336 | exp++; | |
337 | } | |
338 | ||
339 | /* | |
340 | * Clean it up and polish it off. | |
341 | */ | |
342 | exp <<= MANTSIZE; /* Shift the exponent into place */ | |
343 | exp += value; /* and add on the mantissa. */ | |
344 | return exp; | |
345 | } | |
346 | ||
347 | #if ACCT_VERSION==1 || ACCT_VERSION==2 | |
348 | /* | |
349 | * encode an u64 into a comp2_t (24 bits) | |
350 | * | |
351 | * Format: 5 bit base 2 exponent, 20 bits mantissa. | |
352 | * The leading bit of the mantissa is not stored, but implied for | |
353 | * non-zero exponents. | |
354 | * Largest encodable value is 50 bits. | |
355 | */ | |
356 | ||
357 | #define MANTSIZE2 20 /* 20 bit mantissa. */ | |
358 | #define EXPSIZE2 5 /* 5 bit base 2 exponent. */ | |
359 | #define MAXFRACT2 ((1ul << MANTSIZE2) - 1) /* Maximum fractional value. */ | |
360 | #define MAXEXP2 ((1 <<EXPSIZE2) - 1) /* Maximum exponent. */ | |
361 | ||
362 | static comp2_t encode_comp2_t(u64 value) | |
363 | { | |
364 | int exp, rnd; | |
365 | ||
366 | exp = (value > (MAXFRACT2>>1)); | |
367 | rnd = 0; | |
368 | while (value > MAXFRACT2) { | |
369 | rnd = value & 1; | |
370 | value >>= 1; | |
371 | exp++; | |
372 | } | |
373 | ||
374 | /* | |
375 | * If we need to round up, do it (and handle overflow correctly). | |
376 | */ | |
377 | if (rnd && (++value > MAXFRACT2)) { | |
378 | value >>= 1; | |
379 | exp++; | |
380 | } | |
381 | ||
382 | if (exp > MAXEXP2) { | |
383 | /* Overflow. Return largest representable number instead. */ | |
384 | return (1ul << (MANTSIZE2+EXPSIZE2-1)) - 1; | |
385 | } else { | |
386 | return (value & (MAXFRACT2>>1)) | (exp << (MANTSIZE2-1)); | |
387 | } | |
388 | } | |
389 | #endif | |
390 | ||
391 | #if ACCT_VERSION==3 | |
392 | /* | |
393 | * encode an u64 into a 32 bit IEEE float | |
394 | */ | |
395 | static u32 encode_float(u64 value) | |
396 | { | |
397 | unsigned exp = 190; | |
398 | unsigned u; | |
399 | ||
400 | if (value==0) return 0; | |
401 | while ((s64)value > 0){ | |
402 | value <<= 1; | |
403 | exp--; | |
404 | } | |
405 | u = (u32)(value >> 40) & 0x7fffffu; | |
406 | return u | (exp << 23); | |
407 | } | |
408 | #endif | |
409 | ||
410 | /* | |
411 | * Write an accounting entry for an exiting process | |
412 | * | |
413 | * The acct_process() call is the workhorse of the process | |
414 | * accounting system. The struct acct is built here and then written | |
415 | * into the accounting file. This function should only be called from | |
416 | * do_exit(). | |
417 | */ | |
418 | ||
419 | /* | |
420 | * do_acct_process does all actual work. Caller holds the reference to file. | |
421 | */ | |
422 | static void do_acct_process(long exitcode, struct file *file) | |
423 | { | |
424 | acct_t ac; | |
425 | mm_segment_t fs; | |
426 | unsigned long vsize; | |
427 | unsigned long flim; | |
428 | u64 elapsed; | |
429 | u64 run_time; | |
430 | struct timespec uptime; | |
089545f0 | 431 | unsigned long jiffies; |
1da177e4 LT |
432 | |
433 | /* | |
434 | * First check to see if there is enough free_space to continue | |
435 | * the process accounting system. | |
436 | */ | |
437 | if (!check_free_space(file)) | |
438 | return; | |
439 | ||
440 | /* | |
441 | * Fill the accounting struct with the needed info as recorded | |
442 | * by the different kernel functions. | |
443 | */ | |
444 | memset((caddr_t)&ac, 0, sizeof(acct_t)); | |
445 | ||
446 | ac.ac_version = ACCT_VERSION | ACCT_BYTEORDER; | |
447 | strlcpy(ac.ac_comm, current->comm, sizeof(ac.ac_comm)); | |
448 | ||
449 | /* calculate run_time in nsec*/ | |
450 | do_posix_clock_monotonic_gettime(&uptime); | |
451 | run_time = (u64)uptime.tv_sec*NSEC_PER_SEC + uptime.tv_nsec; | |
bb231fe3 KK |
452 | run_time -= (u64)current->group_leader->start_time.tv_sec * NSEC_PER_SEC |
453 | + current->group_leader->start_time.tv_nsec; | |
1da177e4 LT |
454 | /* convert nsec -> AHZ */ |
455 | elapsed = nsec_to_AHZ(run_time); | |
456 | #if ACCT_VERSION==3 | |
457 | ac.ac_etime = encode_float(elapsed); | |
458 | #else | |
459 | ac.ac_etime = encode_comp_t(elapsed < (unsigned long) -1l ? | |
460 | (unsigned long) elapsed : (unsigned long) -1l); | |
461 | #endif | |
462 | #if ACCT_VERSION==1 || ACCT_VERSION==2 | |
463 | { | |
464 | /* new enlarged etime field */ | |
465 | comp2_t etime = encode_comp2_t(elapsed); | |
466 | ac.ac_etime_hi = etime >> 16; | |
467 | ac.ac_etime_lo = (u16) etime; | |
468 | } | |
469 | #endif | |
470 | do_div(elapsed, AHZ); | |
471 | ac.ac_btime = xtime.tv_sec - elapsed; | |
bb231fe3 | 472 | jiffies = cputime_to_jiffies(cputime_add(current->utime, |
089545f0 MS |
473 | current->signal->utime)); |
474 | ac.ac_utime = encode_comp_t(jiffies_to_AHZ(jiffies)); | |
bb231fe3 | 475 | jiffies = cputime_to_jiffies(cputime_add(current->stime, |
089545f0 MS |
476 | current->signal->stime)); |
477 | ac.ac_stime = encode_comp_t(jiffies_to_AHZ(jiffies)); | |
1da177e4 LT |
478 | /* we really need to bite the bullet and change layout */ |
479 | ac.ac_uid = current->uid; | |
480 | ac.ac_gid = current->gid; | |
481 | #if ACCT_VERSION==2 | |
482 | ac.ac_ahz = AHZ; | |
483 | #endif | |
484 | #if ACCT_VERSION==1 || ACCT_VERSION==2 | |
485 | /* backward-compatible 16 bit fields */ | |
486 | ac.ac_uid16 = current->uid; | |
487 | ac.ac_gid16 = current->gid; | |
488 | #endif | |
489 | #if ACCT_VERSION==3 | |
490 | ac.ac_pid = current->tgid; | |
491 | ac.ac_ppid = current->parent->tgid; | |
492 | #endif | |
493 | ||
494 | read_lock(&tasklist_lock); /* pin current->signal */ | |
495 | ac.ac_tty = current->signal->tty ? | |
496 | old_encode_dev(tty_devnum(current->signal->tty)) : 0; | |
497 | read_unlock(&tasklist_lock); | |
498 | ||
499 | ac.ac_flag = 0; | |
500 | if (current->flags & PF_FORKNOEXEC) | |
501 | ac.ac_flag |= AFORK; | |
502 | if (current->flags & PF_SUPERPRIV) | |
503 | ac.ac_flag |= ASU; | |
504 | if (current->flags & PF_DUMPCORE) | |
505 | ac.ac_flag |= ACORE; | |
506 | if (current->flags & PF_SIGNALED) | |
507 | ac.ac_flag |= AXSIG; | |
508 | ||
509 | vsize = 0; | |
510 | if (current->mm) { | |
511 | struct vm_area_struct *vma; | |
512 | down_read(¤t->mm->mmap_sem); | |
513 | vma = current->mm->mmap; | |
514 | while (vma) { | |
515 | vsize += vma->vm_end - vma->vm_start; | |
516 | vma = vma->vm_next; | |
517 | } | |
518 | up_read(¤t->mm->mmap_sem); | |
519 | } | |
520 | vsize = vsize / 1024; | |
521 | ac.ac_mem = encode_comp_t(vsize); | |
522 | ac.ac_io = encode_comp_t(0 /* current->io_usage */); /* %% */ | |
523 | ac.ac_rw = encode_comp_t(ac.ac_io / 1024); | |
524 | ac.ac_minflt = encode_comp_t(current->signal->min_flt + | |
bb231fe3 | 525 | current->min_flt); |
1da177e4 | 526 | ac.ac_majflt = encode_comp_t(current->signal->maj_flt + |
bb231fe3 | 527 | current->maj_flt); |
1da177e4 LT |
528 | ac.ac_swaps = encode_comp_t(0); |
529 | ac.ac_exitcode = exitcode; | |
530 | ||
531 | /* | |
532 | * Kernel segment override to datasegment and write it | |
533 | * to the accounting file. | |
534 | */ | |
535 | fs = get_fs(); | |
536 | set_fs(KERNEL_DS); | |
537 | /* | |
538 | * Accounting records are not subject to resource limits. | |
539 | */ | |
540 | flim = current->signal->rlim[RLIMIT_FSIZE].rlim_cur; | |
541 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY; | |
542 | file->f_op->write(file, (char *)&ac, | |
543 | sizeof(acct_t), &file->f_pos); | |
544 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = flim; | |
545 | set_fs(fs); | |
546 | } | |
547 | ||
417ef531 | 548 | /** |
1da177e4 | 549 | * acct_process - now just a wrapper around do_acct_process |
417ef531 RD |
550 | * @exitcode: task exit code |
551 | * | |
552 | * handles process accounting for an exiting task | |
1da177e4 LT |
553 | */ |
554 | void acct_process(long exitcode) | |
555 | { | |
556 | struct file *file = NULL; | |
557 | ||
558 | /* | |
559 | * accelerate the common fastpath: | |
560 | */ | |
561 | if (!acct_globals.file) | |
562 | return; | |
563 | ||
564 | spin_lock(&acct_globals.lock); | |
565 | file = acct_globals.file; | |
566 | if (unlikely(!file)) { | |
567 | spin_unlock(&acct_globals.lock); | |
568 | return; | |
569 | } | |
570 | get_file(file); | |
571 | spin_unlock(&acct_globals.lock); | |
572 | ||
573 | do_acct_process(exitcode, file); | |
574 | fput(file); | |
575 | } | |
576 | ||
577 | ||
417ef531 RD |
578 | /** |
579 | * acct_update_integrals - update mm integral fields in task_struct | |
580 | * @tsk: task_struct for accounting | |
1da177e4 LT |
581 | */ |
582 | void acct_update_integrals(struct task_struct *tsk) | |
583 | { | |
584 | if (likely(tsk->mm)) { | |
089545f0 MS |
585 | long delta = |
586 | cputime_to_jiffies(tsk->stime) - tsk->acct_stimexpd; | |
1da177e4 LT |
587 | |
588 | if (delta == 0) | |
589 | return; | |
590 | tsk->acct_stimexpd = tsk->stime; | |
4294621f | 591 | tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm); |
1da177e4 LT |
592 | tsk->acct_vm_mem1 += delta * tsk->mm->total_vm; |
593 | } | |
594 | } | |
595 | ||
417ef531 RD |
596 | /** |
597 | * acct_clear_integrals - clear the mm integral fields in task_struct | |
598 | * @tsk: task_struct whose accounting fields are cleared | |
1da177e4 LT |
599 | */ |
600 | void acct_clear_integrals(struct task_struct *tsk) | |
601 | { | |
11e64757 MH |
602 | tsk->acct_stimexpd = 0; |
603 | tsk->acct_rss_mem1 = 0; | |
604 | tsk->acct_vm_mem1 = 0; | |
1da177e4 | 605 | } |