FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_clock.c
1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1982, 1986, 1991, 1993
5 * The Regents of the University of California. All rights reserved.
6 * (c) UNIX System Laboratories, Inc.
7 * All or some portions of this file are derived from material licensed
8 * to the University of California by American Telephone and Telegraph
9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
10 * the permission of UNIX System Laboratories, Inc.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * @(#)kern_clock.c 8.5 (Berkeley) 1/21/94
37 */
38
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD: releng/12.0/sys/kern/kern_clock.c 338487 2018-09-06 02:10:59Z markj $");
41
42 #include "opt_kdb.h"
43 #include "opt_device_polling.h"
44 #include "opt_hwpmc_hooks.h"
45 #include "opt_ntp.h"
46 #include "opt_watchdog.h"
47
48 #include <sys/param.h>
49 #include <sys/systm.h>
50 #include <sys/callout.h>
51 #include <sys/epoch.h>
52 #include <sys/gtaskqueue.h>
53 #include <sys/kdb.h>
54 #include <sys/kernel.h>
55 #include <sys/kthread.h>
56 #include <sys/ktr.h>
57 #include <sys/lock.h>
58 #include <sys/mutex.h>
59 #include <sys/proc.h>
60 #include <sys/resource.h>
61 #include <sys/resourcevar.h>
62 #include <sys/sched.h>
63 #include <sys/sdt.h>
64 #include <sys/signalvar.h>
65 #include <sys/sleepqueue.h>
66 #include <sys/smp.h>
67 #include <vm/vm.h>
68 #include <vm/pmap.h>
69 #include <vm/vm_map.h>
70 #include <sys/sysctl.h>
71 #include <sys/bus.h>
72 #include <sys/interrupt.h>
73 #include <sys/limits.h>
74 #include <sys/timetc.h>
75
76 #ifdef GPROF
77 #include <sys/gmon.h>
78 #endif
79
80 #ifdef HWPMC_HOOKS
81 #include <sys/pmckern.h>
82 PMC_SOFT_DEFINE( , , clock, hard);
83 PMC_SOFT_DEFINE( , , clock, stat);
84 PMC_SOFT_DEFINE_EX( , , clock, prof, \
85 cpu_startprofclock, cpu_stopprofclock);
86 #endif
87
88 #ifdef DEVICE_POLLING
89 extern void hardclock_device_poll(void);
90 #endif /* DEVICE_POLLING */
91
92 static void initclocks(void *dummy);
93 SYSINIT(clocks, SI_SUB_CLOCKS, SI_ORDER_FIRST, initclocks, NULL);
94
95 /* Spin-lock protecting profiling statistics. */
96 static struct mtx time_lock;
97
98 SDT_PROVIDER_DECLARE(sched);
99 SDT_PROBE_DEFINE2(sched, , , tick, "struct thread *", "struct proc *");
100
101 static int
102 sysctl_kern_cp_time(SYSCTL_HANDLER_ARGS)
103 {
104 int error;
105 long cp_time[CPUSTATES];
106 #ifdef SCTL_MASK32
107 int i;
108 unsigned int cp_time32[CPUSTATES];
109 #endif
110
111 read_cpu_time(cp_time);
112 #ifdef SCTL_MASK32
113 if (req->flags & SCTL_MASK32) {
114 if (!req->oldptr)
115 return SYSCTL_OUT(req, 0, sizeof(cp_time32));
116 for (i = 0; i < CPUSTATES; i++)
117 cp_time32[i] = (unsigned int)cp_time[i];
118 error = SYSCTL_OUT(req, cp_time32, sizeof(cp_time32));
119 } else
120 #endif
121 {
122 if (!req->oldptr)
123 return SYSCTL_OUT(req, 0, sizeof(cp_time));
124 error = SYSCTL_OUT(req, cp_time, sizeof(cp_time));
125 }
126 return error;
127 }
128
129 SYSCTL_PROC(_kern, OID_AUTO, cp_time, CTLTYPE_LONG|CTLFLAG_RD|CTLFLAG_MPSAFE,
130 0,0, sysctl_kern_cp_time, "LU", "CPU time statistics");
131
132 static long empty[CPUSTATES];
133
134 static int
135 sysctl_kern_cp_times(SYSCTL_HANDLER_ARGS)
136 {
137 struct pcpu *pcpu;
138 int error;
139 int c;
140 long *cp_time;
141 #ifdef SCTL_MASK32
142 unsigned int cp_time32[CPUSTATES];
143 int i;
144 #endif
145
146 if (!req->oldptr) {
147 #ifdef SCTL_MASK32
148 if (req->flags & SCTL_MASK32)
149 return SYSCTL_OUT(req, 0, sizeof(cp_time32) * (mp_maxid + 1));
150 else
151 #endif
152 return SYSCTL_OUT(req, 0, sizeof(long) * CPUSTATES * (mp_maxid + 1));
153 }
154 for (error = 0, c = 0; error == 0 && c <= mp_maxid; c++) {
155 if (!CPU_ABSENT(c)) {
156 pcpu = pcpu_find(c);
157 cp_time = pcpu->pc_cp_time;
158 } else {
159 cp_time = empty;
160 }
161 #ifdef SCTL_MASK32
162 if (req->flags & SCTL_MASK32) {
163 for (i = 0; i < CPUSTATES; i++)
164 cp_time32[i] = (unsigned int)cp_time[i];
165 error = SYSCTL_OUT(req, cp_time32, sizeof(cp_time32));
166 } else
167 #endif
168 error = SYSCTL_OUT(req, cp_time, sizeof(long) * CPUSTATES);
169 }
170 return error;
171 }
172
173 SYSCTL_PROC(_kern, OID_AUTO, cp_times, CTLTYPE_LONG|CTLFLAG_RD|CTLFLAG_MPSAFE,
174 0,0, sysctl_kern_cp_times, "LU", "per-CPU time statistics");
175
176 #ifdef DEADLKRES
177 static const char *blessed[] = {
178 "getblk",
179 "so_snd_sx",
180 "so_rcv_sx",
181 NULL
182 };
183 static int slptime_threshold = 1800;
184 static int blktime_threshold = 900;
185 static int sleepfreq = 3;
186
187 static void
188 deadlres_td_on_lock(struct proc *p, struct thread *td, int blkticks)
189 {
190 int tticks;
191
192 sx_assert(&allproc_lock, SX_LOCKED);
193 PROC_LOCK_ASSERT(p, MA_OWNED);
194 THREAD_LOCK_ASSERT(td, MA_OWNED);
195 /*
196 * The thread should be blocked on a turnstile, simply check
197 * if the turnstile channel is in good state.
198 */
199 MPASS(td->td_blocked != NULL);
200
201 tticks = ticks - td->td_blktick;
202 if (tticks > blkticks)
203 /*
204 * Accordingly with provided thresholds, this thread is stuck
205 * for too long on a turnstile.
206 */
207 panic("%s: possible deadlock detected for %p, "
208 "blocked for %d ticks\n", __func__, td, tticks);
209 }
210
211 static void
212 deadlres_td_sleep_q(struct proc *p, struct thread *td, int slpticks)
213 {
214 void *wchan;
215 int i, slptype, tticks;
216
217 sx_assert(&allproc_lock, SX_LOCKED);
218 PROC_LOCK_ASSERT(p, MA_OWNED);
219 THREAD_LOCK_ASSERT(td, MA_OWNED);
220 /*
221 * Check if the thread is sleeping on a lock, otherwise skip the check.
222 * Drop the thread lock in order to avoid a LOR with the sleepqueue
223 * spinlock.
224 */
225 wchan = td->td_wchan;
226 tticks = ticks - td->td_slptick;
227 slptype = sleepq_type(wchan);
228 if ((slptype == SLEEPQ_SX || slptype == SLEEPQ_LK) &&
229 tticks > slpticks) {
230
231 /*
232 * Accordingly with provided thresholds, this thread is stuck
233 * for too long on a sleepqueue.
234 * However, being on a sleepqueue, we might still check for the
235 * blessed list.
236 */
237 for (i = 0; blessed[i] != NULL; i++)
238 if (!strcmp(blessed[i], td->td_wmesg))
239 return;
240
241 panic("%s: possible deadlock detected for %p, "
242 "blocked for %d ticks\n", __func__, td, tticks);
243 }
244 }
245
246 static void
247 deadlkres(void)
248 {
249 struct proc *p;
250 struct thread *td;
251 int blkticks, slpticks, tryl;
252
253 tryl = 0;
254 for (;;) {
255 blkticks = blktime_threshold * hz;
256 slpticks = slptime_threshold * hz;
257
258 /*
259 * Avoid to sleep on the sx_lock in order to avoid a
260 * possible priority inversion problem leading to
261 * starvation.
262 * If the lock can't be held after 100 tries, panic.
263 */
264 if (!sx_try_slock(&allproc_lock)) {
265 if (tryl > 100)
266 panic("%s: possible deadlock detected "
267 "on allproc_lock\n", __func__);
268 tryl++;
269 pause("allproc", sleepfreq * hz);
270 continue;
271 }
272 tryl = 0;
273 FOREACH_PROC_IN_SYSTEM(p) {
274 PROC_LOCK(p);
275 if (p->p_state == PRS_NEW) {
276 PROC_UNLOCK(p);
277 continue;
278 }
279 FOREACH_THREAD_IN_PROC(p, td) {
280 thread_lock(td);
281 if (TD_ON_LOCK(td))
282 deadlres_td_on_lock(p, td,
283 blkticks);
284 else if (TD_IS_SLEEPING(td) &&
285 TD_ON_SLEEPQ(td))
286 deadlres_td_sleep_q(p, td,
287 slpticks);
288 thread_unlock(td);
289 }
290 PROC_UNLOCK(p);
291 }
292 sx_sunlock(&allproc_lock);
293
294 /* Sleep for sleepfreq seconds. */
295 pause("-", sleepfreq * hz);
296 }
297 }
298
299 static struct kthread_desc deadlkres_kd = {
300 "deadlkres",
301 deadlkres,
302 (struct thread **)NULL
303 };
304
305 SYSINIT(deadlkres, SI_SUB_CLOCKS, SI_ORDER_ANY, kthread_start, &deadlkres_kd);
306
307 static SYSCTL_NODE(_debug, OID_AUTO, deadlkres, CTLFLAG_RW, 0,
308 "Deadlock resolver");
309 SYSCTL_INT(_debug_deadlkres, OID_AUTO, slptime_threshold, CTLFLAG_RW,
310 &slptime_threshold, 0,
311 "Number of seconds within is valid to sleep on a sleepqueue");
312 SYSCTL_INT(_debug_deadlkres, OID_AUTO, blktime_threshold, CTLFLAG_RW,
313 &blktime_threshold, 0,
314 "Number of seconds within is valid to block on a turnstile");
315 SYSCTL_INT(_debug_deadlkres, OID_AUTO, sleepfreq, CTLFLAG_RW, &sleepfreq, 0,
316 "Number of seconds between any deadlock resolver thread run");
317 #endif /* DEADLKRES */
318
319 void
320 read_cpu_time(long *cp_time)
321 {
322 struct pcpu *pc;
323 int i, j;
324
325 /* Sum up global cp_time[]. */
326 bzero(cp_time, sizeof(long) * CPUSTATES);
327 CPU_FOREACH(i) {
328 pc = pcpu_find(i);
329 for (j = 0; j < CPUSTATES; j++)
330 cp_time[j] += pc->pc_cp_time[j];
331 }
332 }
333
334 #include <sys/watchdog.h>
335
336 static int watchdog_ticks;
337 static int watchdog_enabled;
338 static void watchdog_fire(void);
339 static void watchdog_config(void *, u_int, int *);
340
341 static void
342 watchdog_attach(void)
343 {
344 EVENTHANDLER_REGISTER(watchdog_list, watchdog_config, NULL, 0);
345 }
346
347 /*
348 * Clock handling routines.
349 *
350 * This code is written to operate with two timers that run independently of
351 * each other.
352 *
353 * The main timer, running hz times per second, is used to trigger interval
354 * timers, timeouts and rescheduling as needed.
355 *
356 * The second timer handles kernel and user profiling,
357 * and does resource use estimation. If the second timer is programmable,
358 * it is randomized to avoid aliasing between the two clocks. For example,
359 * the randomization prevents an adversary from always giving up the cpu
360 * just before its quantum expires. Otherwise, it would never accumulate
361 * cpu ticks. The mean frequency of the second timer is stathz.
362 *
363 * If no second timer exists, stathz will be zero; in this case we drive
364 * profiling and statistics off the main clock. This WILL NOT be accurate;
365 * do not do it unless absolutely necessary.
366 *
367 * The statistics clock may (or may not) be run at a higher rate while
368 * profiling. This profile clock runs at profhz. We require that profhz
369 * be an integral multiple of stathz.
370 *
371 * If the statistics clock is running fast, it must be divided by the ratio
372 * profhz/stathz for statistics. (For profiling, every tick counts.)
373 *
374 * Time-of-day is maintained using a "timecounter", which may or may
375 * not be related to the hardware generating the above mentioned
376 * interrupts.
377 */
378
379 int stathz;
380 int profhz;
381 int profprocs;
382 volatile int ticks;
383 int psratio;
384
385 DPCPU_DEFINE_STATIC(int, pcputicks); /* Per-CPU version of ticks. */
386 #ifdef DEVICE_POLLING
387 static int devpoll_run = 0;
388 #endif
389
390 /*
391 * Initialize clock frequencies and start both clocks running.
392 */
393 /* ARGSUSED*/
394 static void
395 initclocks(void *dummy)
396 {
397 int i;
398
399 /*
400 * Set divisors to 1 (normal case) and let the machine-specific
401 * code do its bit.
402 */
403 mtx_init(&time_lock, "time lock", NULL, MTX_DEF);
404 cpu_initclocks();
405
406 /*
407 * Compute profhz/stathz, and fix profhz if needed.
408 */
409 i = stathz ? stathz : hz;
410 if (profhz == 0)
411 profhz = i;
412 psratio = profhz / i;
413
414 #ifdef SW_WATCHDOG
415 /* Enable hardclock watchdog now, even if a hardware watchdog exists. */
416 watchdog_attach();
417 #else
418 /* Volunteer to run a software watchdog. */
419 if (wdog_software_attach == NULL)
420 wdog_software_attach = watchdog_attach;
421 #endif
422 }
423
424 void
425 hardclock(int cnt, int usermode)
426 {
427 struct pstats *pstats;
428 struct thread *td = curthread;
429 struct proc *p = td->td_proc;
430 int *t = DPCPU_PTR(pcputicks);
431 int flags, global, newticks;
432 int i;
433
434 /*
435 * Update per-CPU and possibly global ticks values.
436 */
437 *t += cnt;
438 do {
439 global = ticks;
440 newticks = *t - global;
441 if (newticks <= 0) {
442 if (newticks < -1)
443 *t = global - 1;
444 newticks = 0;
445 break;
446 }
447 } while (!atomic_cmpset_int(&ticks, global, *t));
448
449 /*
450 * Run current process's virtual and profile time, as needed.
451 */
452 pstats = p->p_stats;
453 flags = 0;
454 if (usermode &&
455 timevalisset(&pstats->p_timer[ITIMER_VIRTUAL].it_value)) {
456 PROC_ITIMLOCK(p);
457 if (itimerdecr(&pstats->p_timer[ITIMER_VIRTUAL],
458 tick * cnt) == 0)
459 flags |= TDF_ALRMPEND | TDF_ASTPENDING;
460 PROC_ITIMUNLOCK(p);
461 }
462 if (timevalisset(&pstats->p_timer[ITIMER_PROF].it_value)) {
463 PROC_ITIMLOCK(p);
464 if (itimerdecr(&pstats->p_timer[ITIMER_PROF],
465 tick * cnt) == 0)
466 flags |= TDF_PROFPEND | TDF_ASTPENDING;
467 PROC_ITIMUNLOCK(p);
468 }
469 if (flags != 0) {
470 thread_lock(td);
471 td->td_flags |= flags;
472 thread_unlock(td);
473 }
474
475 #ifdef HWPMC_HOOKS
476 if (PMC_CPU_HAS_SAMPLES(PCPU_GET(cpuid)))
477 PMC_CALL_HOOK_UNLOCKED(curthread, PMC_FN_DO_SAMPLES, NULL);
478 if (td->td_intr_frame != NULL)
479 PMC_SOFT_CALL_TF( , , clock, hard, td->td_intr_frame);
480 #endif
481 /* We are in charge to handle this tick duty. */
482 if (newticks > 0) {
483 tc_ticktock(newticks);
484 #ifdef DEVICE_POLLING
485 /* Dangerous and no need to call these things concurrently. */
486 if (atomic_cmpset_acq_int(&devpoll_run, 0, 1)) {
487 /* This is very short and quick. */
488 hardclock_device_poll();
489 atomic_store_rel_int(&devpoll_run, 0);
490 }
491 #endif /* DEVICE_POLLING */
492 if (watchdog_enabled > 0) {
493 i = atomic_fetchadd_int(&watchdog_ticks, -newticks);
494 if (i > 0 && i <= newticks)
495 watchdog_fire();
496 }
497 }
498 if (curcpu == CPU_FIRST())
499 cpu_tick_calibration();
500 if (__predict_false(DPCPU_GET(epoch_cb_count)))
501 GROUPTASK_ENQUEUE(DPCPU_PTR(epoch_cb_task));
502 }
503
504 void
505 hardclock_sync(int cpu)
506 {
507 int *t;
508 KASSERT(!CPU_ABSENT(cpu), ("Absent CPU %d", cpu));
509 t = DPCPU_ID_PTR(cpu, pcputicks);
510
511 *t = ticks;
512 }
513
514 /*
515 * Compute number of ticks in the specified amount of time.
516 */
517 int
518 tvtohz(struct timeval *tv)
519 {
520 unsigned long ticks;
521 long sec, usec;
522
523 /*
524 * If the number of usecs in the whole seconds part of the time
525 * difference fits in a long, then the total number of usecs will
526 * fit in an unsigned long. Compute the total and convert it to
527 * ticks, rounding up and adding 1 to allow for the current tick
528 * to expire. Rounding also depends on unsigned long arithmetic
529 * to avoid overflow.
530 *
531 * Otherwise, if the number of ticks in the whole seconds part of
532 * the time difference fits in a long, then convert the parts to
533 * ticks separately and add, using similar rounding methods and
534 * overflow avoidance. This method would work in the previous
535 * case but it is slightly slower and assumes that hz is integral.
536 *
537 * Otherwise, round the time difference down to the maximum
538 * representable value.
539 *
540 * If ints have 32 bits, then the maximum value for any timeout in
541 * 10ms ticks is 248 days.
542 */
543 sec = tv->tv_sec;
544 usec = tv->tv_usec;
545 if (usec < 0) {
546 sec--;
547 usec += 1000000;
548 }
549 if (sec < 0) {
550 #ifdef DIAGNOSTIC
551 if (usec > 0) {
552 sec++;
553 usec -= 1000000;
554 }
555 printf("tvotohz: negative time difference %ld sec %ld usec\n",
556 sec, usec);
557 #endif
558 ticks = 1;
559 } else if (sec <= LONG_MAX / 1000000)
560 ticks = howmany(sec * 1000000 + (unsigned long)usec, tick) + 1;
561 else if (sec <= LONG_MAX / hz)
562 ticks = sec * hz
563 + howmany((unsigned long)usec, tick) + 1;
564 else
565 ticks = LONG_MAX;
566 if (ticks > INT_MAX)
567 ticks = INT_MAX;
568 return ((int)ticks);
569 }
570
571 /*
572 * Start profiling on a process.
573 *
574 * Kernel profiling passes proc0 which never exits and hence
575 * keeps the profile clock running constantly.
576 */
577 void
578 startprofclock(struct proc *p)
579 {
580
581 PROC_LOCK_ASSERT(p, MA_OWNED);
582 if (p->p_flag & P_STOPPROF)
583 return;
584 if ((p->p_flag & P_PROFIL) == 0) {
585 p->p_flag |= P_PROFIL;
586 mtx_lock(&time_lock);
587 if (++profprocs == 1)
588 cpu_startprofclock();
589 mtx_unlock(&time_lock);
590 }
591 }
592
593 /*
594 * Stop profiling on a process.
595 */
596 void
597 stopprofclock(struct proc *p)
598 {
599
600 PROC_LOCK_ASSERT(p, MA_OWNED);
601 if (p->p_flag & P_PROFIL) {
602 if (p->p_profthreads != 0) {
603 while (p->p_profthreads != 0) {
604 p->p_flag |= P_STOPPROF;
605 msleep(&p->p_profthreads, &p->p_mtx, PPAUSE,
606 "stopprof", 0);
607 }
608 }
609 if ((p->p_flag & P_PROFIL) == 0)
610 return;
611 p->p_flag &= ~P_PROFIL;
612 mtx_lock(&time_lock);
613 if (--profprocs == 0)
614 cpu_stopprofclock();
615 mtx_unlock(&time_lock);
616 }
617 }
618
619 /*
620 * Statistics clock. Updates rusage information and calls the scheduler
621 * to adjust priorities of the active thread.
622 *
623 * This should be called by all active processors.
624 */
625 void
626 statclock(int cnt, int usermode)
627 {
628 struct rusage *ru;
629 struct vmspace *vm;
630 struct thread *td;
631 struct proc *p;
632 long rss;
633 long *cp_time;
634
635 td = curthread;
636 p = td->td_proc;
637
638 cp_time = (long *)PCPU_PTR(cp_time);
639 if (usermode) {
640 /*
641 * Charge the time as appropriate.
642 */
643 td->td_uticks += cnt;
644 if (p->p_nice > NZERO)
645 cp_time[CP_NICE] += cnt;
646 else
647 cp_time[CP_USER] += cnt;
648 } else {
649 /*
650 * Came from kernel mode, so we were:
651 * - handling an interrupt,
652 * - doing syscall or trap work on behalf of the current
653 * user process, or
654 * - spinning in the idle loop.
655 * Whichever it is, charge the time as appropriate.
656 * Note that we charge interrupts to the current process,
657 * regardless of whether they are ``for'' that process,
658 * so that we know how much of its real time was spent
659 * in ``non-process'' (i.e., interrupt) work.
660 */
661 if ((td->td_pflags & TDP_ITHREAD) ||
662 td->td_intr_nesting_level >= 2) {
663 td->td_iticks += cnt;
664 cp_time[CP_INTR] += cnt;
665 } else {
666 td->td_pticks += cnt;
667 td->td_sticks += cnt;
668 if (!TD_IS_IDLETHREAD(td))
669 cp_time[CP_SYS] += cnt;
670 else
671 cp_time[CP_IDLE] += cnt;
672 }
673 }
674
675 /* Update resource usage integrals and maximums. */
676 MPASS(p->p_vmspace != NULL);
677 vm = p->p_vmspace;
678 ru = &td->td_ru;
679 ru->ru_ixrss += pgtok(vm->vm_tsize) * cnt;
680 ru->ru_idrss += pgtok(vm->vm_dsize) * cnt;
681 ru->ru_isrss += pgtok(vm->vm_ssize) * cnt;
682 rss = pgtok(vmspace_resident_count(vm));
683 if (ru->ru_maxrss < rss)
684 ru->ru_maxrss = rss;
685 KTR_POINT2(KTR_SCHED, "thread", sched_tdname(td), "statclock",
686 "prio:%d", td->td_priority, "stathz:%d", (stathz)?stathz:hz);
687 SDT_PROBE2(sched, , , tick, td, td->td_proc);
688 thread_lock_flags(td, MTX_QUIET);
689 for ( ; cnt > 0; cnt--)
690 sched_clock(td);
691 thread_unlock(td);
692 #ifdef HWPMC_HOOKS
693 if (td->td_intr_frame != NULL)
694 PMC_SOFT_CALL_TF( , , clock, stat, td->td_intr_frame);
695 #endif
696 }
697
698 void
699 profclock(int cnt, int usermode, uintfptr_t pc)
700 {
701 struct thread *td;
702 #ifdef GPROF
703 struct gmonparam *g;
704 uintfptr_t i;
705 #endif
706
707 td = curthread;
708 if (usermode) {
709 /*
710 * Came from user mode; CPU was in user state.
711 * If this process is being profiled, record the tick.
712 * if there is no related user location yet, don't
713 * bother trying to count it.
714 */
715 if (td->td_proc->p_flag & P_PROFIL)
716 addupc_intr(td, pc, cnt);
717 }
718 #ifdef GPROF
719 else {
720 /*
721 * Kernel statistics are just like addupc_intr, only easier.
722 */
723 g = &_gmonparam;
724 if (g->state == GMON_PROF_ON && pc >= g->lowpc) {
725 i = PC_TO_I(g, pc);
726 if (i < g->textsize) {
727 KCOUNT(g, i) += cnt;
728 }
729 }
730 }
731 #endif
732 #ifdef HWPMC_HOOKS
733 if (td->td_intr_frame != NULL)
734 PMC_SOFT_CALL_TF( , , clock, prof, td->td_intr_frame);
735 #endif
736 }
737
738 /*
739 * Return information about system clocks.
740 */
741 static int
742 sysctl_kern_clockrate(SYSCTL_HANDLER_ARGS)
743 {
744 struct clockinfo clkinfo;
745 /*
746 * Construct clockinfo structure.
747 */
748 bzero(&clkinfo, sizeof(clkinfo));
749 clkinfo.hz = hz;
750 clkinfo.tick = tick;
751 clkinfo.profhz = profhz;
752 clkinfo.stathz = stathz ? stathz : hz;
753 return (sysctl_handle_opaque(oidp, &clkinfo, sizeof clkinfo, req));
754 }
755
756 SYSCTL_PROC(_kern, KERN_CLOCKRATE, clockrate,
757 CTLTYPE_STRUCT|CTLFLAG_RD|CTLFLAG_MPSAFE,
758 0, 0, sysctl_kern_clockrate, "S,clockinfo",
759 "Rate and period of various kernel clocks");
760
761 static void
762 watchdog_config(void *unused __unused, u_int cmd, int *error)
763 {
764 u_int u;
765
766 u = cmd & WD_INTERVAL;
767 if (u >= WD_TO_1SEC) {
768 watchdog_ticks = (1 << (u - WD_TO_1SEC)) * hz;
769 watchdog_enabled = 1;
770 *error = 0;
771 } else {
772 watchdog_enabled = 0;
773 }
774 }
775
776 /*
777 * Handle a watchdog timeout by dumping interrupt information and
778 * then either dropping to DDB or panicking.
779 */
780 static void
781 watchdog_fire(void)
782 {
783 int nintr;
784 uint64_t inttotal;
785 u_long *curintr;
786 char *curname;
787
788 curintr = intrcnt;
789 curname = intrnames;
790 inttotal = 0;
791 nintr = sintrcnt / sizeof(u_long);
792
793 printf("interrupt total\n");
794 while (--nintr >= 0) {
795 if (*curintr)
796 printf("%-12s %20lu\n", curname, *curintr);
797 curname += strlen(curname) + 1;
798 inttotal += *curintr++;
799 }
800 printf("Total %20ju\n", (uintmax_t)inttotal);
801
802 #if defined(KDB) && !defined(KDB_UNATTENDED)
803 kdb_backtrace();
804 kdb_enter(KDB_WHY_WATCHDOG, "watchdog timeout");
805 #else
806 panic("watchdog timeout");
807 #endif
808 }
Cache object: c5e2383a3f427a5e728601ce6da4ea8d
|