2 * Copyright (c) 2003,2004 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * Copyright (c) 1997, 1998 Poul-Henning Kamp <phk@FreeBSD.org>
35 * Copyright (c) 1982, 1986, 1991, 1993
36 * The Regents of the University of California. All rights reserved.
37 * (c) UNIX System Laboratories, Inc.
38 * All or some portions of this file are derived from material licensed
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41 * the permission of UNIX System Laboratories, Inc.
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44 * modification, are permitted provided that the following conditions
46 * 1. Redistributions of source code must retain the above copyright
47 * notice, this list of conditions and the following disclaimer.
48 * 2. Redistributions in binary form must reproduce the above copyright
49 * notice, this list of conditions and the following disclaimer in the
50 * documentation and/or other materials provided with the distribution.
51 * 3. Neither the name of the University nor the names of its contributors
52 * may be used to endorse or promote products derived from this software
53 * without specific prior written permission.
55 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
56 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
58 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
59 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
60 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
61 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
67 * @(#)kern_clock.c 8.5 (Berkeley) 1/21/94
68 * $FreeBSD: src/sys/kern/kern_clock.c,v 1.105.2.10 2002/10/17 13:19:40 maxim Exp $
72 #include "opt_pctrack.h"
74 #include <sys/param.h>
75 #include <sys/systm.h>
76 #include <sys/callout.h>
77 #include <sys/kernel.h>
78 #include <sys/kinfo.h>
80 #include <sys/malloc.h>
81 #include <sys/resource.h>
82 #include <sys/resourcevar.h>
83 #include <sys/signalvar.h>
85 #include <sys/timex.h>
86 #include <sys/timepps.h>
87 #include <sys/upmap.h>
89 #include <sys/sysctl.h>
90 #include <sys/kcollect.h>
94 #include <vm/vm_map.h>
95 #include <vm/vm_extern.h>
97 #include <sys/thread2.h>
98 #include <sys/spinlock2.h>
100 #include <machine/cpu.h>
101 #include <machine/limits.h>
102 #include <machine/smp.h>
103 #include <machine/cpufunc.h>
104 #include <machine/specialreg.h>
105 #include <machine/clock.h>
108 #include <sys/gmon.h>
112 static void do_pctrack(struct intrframe *frame, int which);
115 static void initclocks (void *dummy);
116 SYSINIT(clocks, SI_BOOT2_CLOCKS, SI_ORDER_FIRST, initclocks, NULL);
119 * Some of these don't belong here, but it's easiest to concentrate them.
120 * Note that cpu_time counts in microseconds, but most userland programs
121 * just compare relative times against the total by delta.
123 struct kinfo_cputime cputime_percpu[MAXCPU];
125 struct kinfo_pcheader cputime_pcheader = { PCTRACK_SIZE, PCTRACK_ARYSIZE };
126 struct kinfo_pctrack cputime_pctrack[MAXCPU][PCTRACK_SIZE];
129 static int sniff_enable = 1;
130 static int sniff_target = -1;
131 SYSCTL_INT(_kern, OID_AUTO, sniff_enable, CTLFLAG_RW, &sniff_enable, 0 , "");
132 SYSCTL_INT(_kern, OID_AUTO, sniff_target, CTLFLAG_RW, &sniff_target, 0 , "");
135 sysctl_cputime(SYSCTL_HANDLER_ARGS)
139 size_t size = sizeof(struct kinfo_cputime);
140 struct kinfo_cputime tmp;
143 * NOTE: For security reasons, only root can sniff %rip
145 root_error = priv_check_cred(curthread->td_ucred, PRIV_ROOT, 0);
147 for (cpu = 0; cpu < ncpus; ++cpu) {
148 tmp = cputime_percpu[cpu];
149 if (root_error == 0) {
151 (int64_t)globaldata_find(cpu)->gd_sample_pc;
153 (int64_t)globaldata_find(cpu)->gd_sample_sp;
155 if ((error = SYSCTL_OUT(req, &tmp, size)) != 0)
159 if (root_error == 0) {
161 int n = sniff_target;
171 SYSCTL_PROC(_kern, OID_AUTO, cputime, (CTLTYPE_OPAQUE|CTLFLAG_RD), 0, 0,
172 sysctl_cputime, "S,kinfo_cputime", "CPU time statistics");
175 sysctl_cp_time(SYSCTL_HANDLER_ARGS)
177 long cpu_states[CPUSTATES] = {0};
179 size_t size = sizeof(cpu_states);
181 for (cpu = 0; cpu < ncpus; ++cpu) {
182 cpu_states[CP_USER] += cputime_percpu[cpu].cp_user;
183 cpu_states[CP_NICE] += cputime_percpu[cpu].cp_nice;
184 cpu_states[CP_SYS] += cputime_percpu[cpu].cp_sys;
185 cpu_states[CP_INTR] += cputime_percpu[cpu].cp_intr;
186 cpu_states[CP_IDLE] += cputime_percpu[cpu].cp_idle;
189 error = SYSCTL_OUT(req, cpu_states, size);
194 SYSCTL_PROC(_kern, OID_AUTO, cp_time, (CTLTYPE_LONG|CTLFLAG_RD), 0, 0,
195 sysctl_cp_time, "LU", "CPU time statistics");
198 sysctl_cp_times(SYSCTL_HANDLER_ARGS)
200 long cpu_states[CPUSTATES] = {0};
202 size_t size = sizeof(cpu_states);
204 for (error = 0, cpu = 0; error == 0 && cpu < ncpus; ++cpu) {
205 cpu_states[CP_USER] = cputime_percpu[cpu].cp_user;
206 cpu_states[CP_NICE] = cputime_percpu[cpu].cp_nice;
207 cpu_states[CP_SYS] = cputime_percpu[cpu].cp_sys;
208 cpu_states[CP_INTR] = cputime_percpu[cpu].cp_intr;
209 cpu_states[CP_IDLE] = cputime_percpu[cpu].cp_idle;
210 error = SYSCTL_OUT(req, cpu_states, size);
216 SYSCTL_PROC(_kern, OID_AUTO, cp_times, (CTLTYPE_LONG|CTLFLAG_RD), 0, 0,
217 sysctl_cp_times, "LU", "per-CPU time statistics");
220 * boottime is used to calculate the 'real' uptime. Do not confuse this with
221 * microuptime(). microtime() is not drift compensated. The real uptime
222 * with compensation is nanotime() - bootime. boottime is recalculated
223 * whenever the real time is set based on the compensated elapsed time
224 * in seconds (gd->gd_time_seconds).
226 * The gd_time_seconds and gd_cpuclock_base fields remain fairly monotonic.
227 * Slight adjustments to gd_cpuclock_base are made to phase-lock it to
230 * WARNING! time_second can backstep on time corrections. Also, unlike
231 * time_second, time_uptime is not a "real" time_t (seconds
232 * since the Epoch) but seconds since booting.
234 struct timespec boottime; /* boot time (realtime) for reference only */
235 time_t time_second; /* read-only 'passive' realtime in seconds */
236 time_t time_uptime; /* read-only 'passive' uptime in seconds */
239 * basetime is used to calculate the compensated real time of day. The
240 * basetime can be modified on a per-tick basis by the adjtime(),
241 * ntp_adjtime(), and sysctl-based time correction APIs.
243 * Note that frequency corrections can also be made by adjusting
246 * basetime is a tail-chasing FIFO, updated only by cpu #0. The FIFO is
247 * used on both SMP and UP systems to avoid MP races between cpu's and
248 * interrupt races on UP systems.
251 __uint32_t time_second;
252 sysclock_t cpuclock_base;
255 #define BASETIME_ARYSIZE 16
256 #define BASETIME_ARYMASK (BASETIME_ARYSIZE - 1)
257 static struct timespec basetime[BASETIME_ARYSIZE];
258 static struct hardtime hardtime[BASETIME_ARYSIZE];
259 static volatile int basetime_index;
262 sysctl_get_basetime(SYSCTL_HANDLER_ARGS)
269 * Because basetime data and index may be updated by another cpu,
270 * a load fence is required to ensure that the data we read has
271 * not been speculatively read relative to a possibly updated index.
273 index = basetime_index;
275 bt = &basetime[index];
276 error = SYSCTL_OUT(req, bt, sizeof(*bt));
280 SYSCTL_STRUCT(_kern, KERN_BOOTTIME, boottime, CTLFLAG_RD,
281 &boottime, timespec, "System boottime");
282 SYSCTL_PROC(_kern, OID_AUTO, basetime, CTLTYPE_STRUCT|CTLFLAG_RD, 0, 0,
283 sysctl_get_basetime, "S,timespec", "System basetime");
285 static void hardclock(systimer_t info, int, struct intrframe *frame);
286 static void statclock(systimer_t info, int, struct intrframe *frame);
287 static void schedclock(systimer_t info, int, struct intrframe *frame);
288 static void getnanotime_nbt(struct timespec *nbt, struct timespec *tsp);
290 int ticks; /* system master ticks at hz */
291 int clocks_running; /* tsleep/timeout clocks operational */
292 int64_t nsec_adj; /* ntpd per-tick adjustment in nsec << 32 */
293 int64_t nsec_acc; /* accumulator */
294 int sched_ticks; /* global schedule clock ticks */
296 /* NTPD time correction fields */
297 int64_t ntp_tick_permanent; /* per-tick adjustment in nsec << 32 */
298 int64_t ntp_tick_acc; /* accumulator for per-tick adjustment */
299 int64_t ntp_delta; /* one-time correction in nsec */
300 int64_t ntp_big_delta = 1000000000;
301 int32_t ntp_tick_delta; /* current adjustment rate */
302 int32_t ntp_default_tick_delta; /* adjustment rate for ntp_delta */
303 time_t ntp_leap_second; /* time of next leap second */
304 int ntp_leap_insert; /* whether to insert or remove a second */
305 struct spinlock ntp_spin;
308 * Finish initializing clock frequencies and start all clocks running.
312 initclocks(void *dummy)
314 /*psratio = profhz / stathz;*/
315 spin_init(&ntp_spin, "ntp");
319 kpmap->tsc_freq = tsc_frequency;
320 kpmap->tick_freq = hz;
325 * Called on a per-cpu basis from the idle thread bootstrap on each cpu
326 * during SMP initialization.
328 * This routine is called concurrently during low-level SMP initialization
329 * and may not block in any way. Meaning, among other things, we can't
330 * acquire any tokens.
333 initclocks_pcpu(void)
335 struct globaldata *gd = mycpu;
338 if (gd->gd_cpuid == 0) {
339 gd->gd_time_seconds = 1;
340 gd->gd_cpuclock_base = sys_cputimer->count();
341 hardtime[0].time_second = gd->gd_time_seconds;
342 hardtime[0].cpuclock_base = gd->gd_cpuclock_base;
344 gd->gd_time_seconds = globaldata_find(0)->gd_time_seconds;
345 gd->gd_cpuclock_base = globaldata_find(0)->gd_cpuclock_base;
348 systimer_intr_enable();
354 * Called on a 10-second interval after the system is operational.
355 * Return the collection data for USERPCT and install the data for
356 * SYSTPCT and IDLEPCT.
360 collect_cputime_callback(int n)
362 static long cpu_base[CPUSTATES];
363 long cpu_states[CPUSTATES];
368 bzero(cpu_states, sizeof(cpu_states));
369 for (n = 0; n < ncpus; ++n) {
370 cpu_states[CP_USER] += cputime_percpu[n].cp_user;
371 cpu_states[CP_NICE] += cputime_percpu[n].cp_nice;
372 cpu_states[CP_SYS] += cputime_percpu[n].cp_sys;
373 cpu_states[CP_INTR] += cputime_percpu[n].cp_intr;
374 cpu_states[CP_IDLE] += cputime_percpu[n].cp_idle;
378 for (n = 0; n < CPUSTATES; ++n) {
379 total = cpu_states[n] - cpu_base[n];
380 cpu_base[n] = cpu_states[n];
381 cpu_states[n] = total;
384 if (acc == 0) /* prevent degenerate divide by 0 */
386 lsb = acc / (10000 * 2);
387 kcollect_setvalue(KCOLLECT_SYSTPCT,
388 (cpu_states[CP_SYS] + lsb) * 10000 / acc);
389 kcollect_setvalue(KCOLLECT_IDLEPCT,
390 (cpu_states[CP_IDLE] + lsb) * 10000 / acc);
391 kcollect_setvalue(KCOLLECT_INTRPCT,
392 (cpu_states[CP_INTR] + lsb) * 10000 / acc);
393 return((cpu_states[CP_USER] + cpu_states[CP_NICE] + lsb) * 10000 / acc);
397 * This routine is called on just the BSP, just after SMP initialization
398 * completes to * finish initializing any clocks that might contend/block
399 * (e.g. like on a token). We can't do this in initclocks_pcpu() because
400 * that function is called from the idle thread bootstrap for each cpu and
401 * not allowed to block at all.
405 initclocks_other(void *dummy)
407 struct globaldata *ogd = mycpu;
408 struct globaldata *gd;
411 for (n = 0; n < ncpus; ++n) {
412 lwkt_setcpu_self(globaldata_find(n));
416 * Use a non-queued periodic systimer to prevent multiple
417 * ticks from building up if the sysclock jumps forward
418 * (8254 gets reset). The sysclock will never jump backwards.
419 * Our time sync is based on the actual sysclock, not the
422 * Install statclock before hardclock to prevent statclock
423 * from misinterpreting gd_flags for tick assignment when
426 systimer_init_periodic_flags(&gd->gd_statclock, statclock,
428 SYSTF_MSSYNC | SYSTF_FIRST);
429 systimer_init_periodic_flags(&gd->gd_hardclock, hardclock,
430 NULL, hz, SYSTF_MSSYNC);
431 /* XXX correct the frequency for scheduler / estcpu tests */
432 systimer_init_periodic_flags(&gd->gd_schedclock, schedclock,
433 NULL, ESTCPUFREQ, SYSTF_MSSYNC);
435 lwkt_setcpu_self(ogd);
438 * Regular data collection
440 kcollect_register(KCOLLECT_USERPCT, "user", collect_cputime_callback,
441 KCOLLECT_SCALE(KCOLLECT_USERPCT_FORMAT, 0));
442 kcollect_register(KCOLLECT_SYSTPCT, "syst", NULL,
443 KCOLLECT_SCALE(KCOLLECT_SYSTPCT_FORMAT, 0));
444 kcollect_register(KCOLLECT_IDLEPCT, "idle", NULL,
445 KCOLLECT_SCALE(KCOLLECT_IDLEPCT_FORMAT, 0));
447 SYSINIT(clocks2, SI_BOOT2_POST_SMP, SI_ORDER_ANY, initclocks_other, NULL);
450 * This sets the current real time of day. Timespecs are in seconds and
451 * nanoseconds. We do not mess with gd_time_seconds and gd_cpuclock_base,
452 * instead we adjust basetime so basetime + gd_* results in the current
453 * time of day. This way the gd_* fields are guaranteed to represent
454 * a monotonically increasing 'uptime' value.
456 * When set_timeofday() is called from userland, the system call forces it
457 * onto cpu #0 since only cpu #0 can update basetime_index.
460 set_timeofday(struct timespec *ts)
462 struct timespec *nbt;
466 * XXX SMP / non-atomic basetime updates
469 ni = (basetime_index + 1) & BASETIME_ARYMASK;
473 nbt->tv_sec = ts->tv_sec - nbt->tv_sec;
474 nbt->tv_nsec = ts->tv_nsec - nbt->tv_nsec;
475 if (nbt->tv_nsec < 0) {
476 nbt->tv_nsec += 1000000000;
481 * Note that basetime diverges from boottime as the clock drift is
482 * compensated for, so we cannot do away with boottime. When setting
483 * the absolute time of day the drift is 0 (for an instant) and we
484 * can simply assign boottime to basetime.
486 * Note that nanouptime() is based on gd_time_seconds which is drift
487 * compensated up to a point (it is guaranteed to remain monotonically
488 * increasing). gd_time_seconds is thus our best uptime guess and
489 * suitable for use in the boottime calculation. It is already taken
490 * into account in the basetime calculation above.
492 spin_lock(&ntp_spin);
493 boottime.tv_sec = nbt->tv_sec;
497 * We now have a new basetime, make sure all other cpus have it,
498 * then update the index.
502 spin_unlock(&ntp_spin);
508 * Each cpu has its own hardclock, but we only increments ticks and softticks
511 * NOTE! systimer! the MP lock might not be held here. We can only safely
512 * manipulate objects owned by the current cpu.
515 hardclock(systimer_t info, int in_ipi, struct intrframe *frame)
519 struct globaldata *gd = mycpu;
521 if ((gd->gd_reqflags & RQF_IPIQ) == 0 && lwkt_need_ipiq_process(gd)) {
522 /* Defer to doreti on passive IPIQ processing */
527 * We update the compensation base to calculate fine-grained time
528 * from the sys_cputimer on a per-cpu basis in order to avoid
529 * having to mess around with locks. sys_cputimer is assumed to
530 * be consistent across all cpus. CPU N copies the base state from
531 * CPU 0 using the same FIFO trick that we use for basetime (so we
532 * don't catch a CPU 0 update in the middle).
534 * Note that we never allow info->time (aka gd->gd_hardclock.time)
535 * to reverse index gd_cpuclock_base, but that it is possible for
536 * it to temporarily get behind in the seconds if something in the
537 * system locks interrupts for a long period of time. Since periodic
538 * timers count events, though everything should resynch again
541 if (gd->gd_cpuid == 0) {
544 cputicks = info->time - gd->gd_cpuclock_base;
545 if (cputicks >= sys_cputimer->freq) {
546 cputicks /= sys_cputimer->freq;
547 if (cputicks != 0 && cputicks != 1)
548 kprintf("Warning: hardclock missed > 1 sec\n");
549 gd->gd_time_seconds += cputicks;
550 gd->gd_cpuclock_base += sys_cputimer->freq * cputicks;
551 /* uncorrected monotonic 1-sec gran */
552 time_uptime += cputicks;
554 ni = (basetime_index + 1) & BASETIME_ARYMASK;
555 hardtime[ni].time_second = gd->gd_time_seconds;
556 hardtime[ni].cpuclock_base = gd->gd_cpuclock_base;
562 gd->gd_time_seconds = hardtime[ni].time_second;
563 gd->gd_cpuclock_base = hardtime[ni].cpuclock_base;
567 * The system-wide ticks counter and NTP related timedelta/tickdelta
568 * adjustments only occur on cpu #0. NTP adjustments are accomplished
569 * by updating basetime.
571 if (gd->gd_cpuid == 0) {
572 struct timespec *nbt;
580 if (tco->tc_poll_pps)
581 tco->tc_poll_pps(tco);
585 * Calculate the new basetime index. We are in a critical section
586 * on cpu #0 and can safely play with basetime_index. Start
587 * with the current basetime and then make adjustments.
589 ni = (basetime_index + 1) & BASETIME_ARYMASK;
591 *nbt = basetime[basetime_index];
594 * ntp adjustments only occur on cpu 0 and are protected by
595 * ntp_spin. This spinlock virtually never conflicts.
597 spin_lock(&ntp_spin);
600 * Apply adjtime corrections. (adjtime() API)
602 * adjtime() only runs on cpu #0 so our critical section is
603 * sufficient to access these variables.
605 if (ntp_delta != 0) {
606 nbt->tv_nsec += ntp_tick_delta;
607 ntp_delta -= ntp_tick_delta;
608 if ((ntp_delta > 0 && ntp_delta < ntp_tick_delta) ||
609 (ntp_delta < 0 && ntp_delta > ntp_tick_delta)) {
610 ntp_tick_delta = ntp_delta;
615 * Apply permanent frequency corrections. (sysctl API)
617 if (ntp_tick_permanent != 0) {
618 ntp_tick_acc += ntp_tick_permanent;
619 if (ntp_tick_acc >= (1LL << 32)) {
620 nbt->tv_nsec += ntp_tick_acc >> 32;
621 ntp_tick_acc -= (ntp_tick_acc >> 32) << 32;
622 } else if (ntp_tick_acc <= -(1LL << 32)) {
623 /* Negate ntp_tick_acc to avoid shifting the sign bit. */
624 nbt->tv_nsec -= (-ntp_tick_acc) >> 32;
625 ntp_tick_acc += ((-ntp_tick_acc) >> 32) << 32;
629 if (nbt->tv_nsec >= 1000000000) {
631 nbt->tv_nsec -= 1000000000;
632 } else if (nbt->tv_nsec < 0) {
634 nbt->tv_nsec += 1000000000;
638 * Another per-tick compensation. (for ntp_adjtime() API)
641 nsec_acc += nsec_adj;
642 if (nsec_acc >= 0x100000000LL) {
643 nbt->tv_nsec += nsec_acc >> 32;
644 nsec_acc = (nsec_acc & 0xFFFFFFFFLL);
645 } else if (nsec_acc <= -0x100000000LL) {
646 nbt->tv_nsec -= -nsec_acc >> 32;
647 nsec_acc = -(-nsec_acc & 0xFFFFFFFFLL);
649 if (nbt->tv_nsec >= 1000000000) {
650 nbt->tv_nsec -= 1000000000;
652 } else if (nbt->tv_nsec < 0) {
653 nbt->tv_nsec += 1000000000;
657 spin_unlock(&ntp_spin);
659 /************************************************************
660 * LEAP SECOND CORRECTION *
661 ************************************************************
663 * Taking into account all the corrections made above, figure
664 * out the new real time. If the seconds field has changed
665 * then apply any pending leap-second corrections.
667 getnanotime_nbt(nbt, &nts);
669 if (time_second != nts.tv_sec) {
671 * Apply leap second (sysctl API). Adjust nts for changes
672 * so we do not have to call getnanotime_nbt again.
674 if (ntp_leap_second) {
675 if (ntp_leap_second == nts.tv_sec) {
676 if (ntp_leap_insert) {
688 * Apply leap second (ntp_adjtime() API), calculate a new
689 * nsec_adj field. ntp_update_second() returns nsec_adj
690 * as a per-second value but we need it as a per-tick value.
692 leap = ntp_update_second(time_second, &nsec_adj);
698 * Update the time_second 'approximate time' global.
700 time_second = nts.tv_sec;
704 * Finally, our new basetime is ready to go live!
710 * Update kpmap on each tick. TS updates are integrated with
711 * fences and upticks allowing userland to read the data
717 w = (kpmap->upticks + 1) & 1;
718 getnanouptime(&kpmap->ts_uptime[w]);
719 getnanotime(&kpmap->ts_realtime[w]);
727 * lwkt thread scheduler fair queueing
729 lwkt_schedulerclock(curthread);
732 * softticks are handled for all cpus
734 hardclock_softtick(gd);
737 * Rollup accumulated vmstats, copy-back for critical path checks.
739 vmstats_rollup_cpu(gd);
740 mycpu->gd_vmstats = vmstats;
743 * ITimer handling is per-tick, per-cpu.
745 * We must acquire the per-process token in order for ksignal()
746 * to be non-blocking. For the moment this requires an AST fault,
747 * the ksignal() cannot be safely issued from this hard interrupt.
749 * XXX Even the trytoken here isn't right, and itimer operation in
750 * a multi threaded environment is going to be weird at the
753 if ((p = curproc) != NULL && lwkt_trytoken(&p->p_token)) {
756 ++p->p_upmap->runticks;
758 if (frame && CLKF_USERMODE(frame) &&
759 timevalisset(&p->p_timer[ITIMER_VIRTUAL].it_value) &&
760 itimerdecr(&p->p_timer[ITIMER_VIRTUAL], ustick) == 0) {
761 p->p_flags |= P_SIGVTALRM;
764 if (timevalisset(&p->p_timer[ITIMER_PROF].it_value) &&
765 itimerdecr(&p->p_timer[ITIMER_PROF], ustick) == 0) {
766 p->p_flags |= P_SIGPROF;
770 lwkt_reltoken(&p->p_token);
776 * The statistics clock typically runs at a 125Hz rate, and is intended
777 * to be frequency offset from the hardclock (typ 100Hz). It is per-cpu.
779 * NOTE! systimer! the MP lock might not be held here. We can only safely
780 * manipulate objects owned by the current cpu.
782 * The stats clock is responsible for grabbing a profiling sample.
783 * Most of the statistics are only used by user-level statistics programs.
784 * The main exceptions are p->p_uticks, p->p_sticks, p->p_iticks, and
787 * Like the other clocks, the stat clock is called from what is effectively
788 * a fast interrupt, so the context should be the thread/process that got
792 statclock(systimer_t info, int in_ipi, struct intrframe *frame)
798 globaldata_t gd = mycpu;
806 * How big was our timeslice relative to the last time? Calculate
809 * NOTE: Use of microuptime() is typically MPSAFE, but usually not
810 * during early boot. Just use the systimer count to be nice
811 * to e.g. qemu. The systimer has a better chance of being
812 * MPSAFE at early boot.
814 cv = sys_cputimer->count();
815 scv = gd->statint.gd_statcv;
819 bump = (sys_cputimer->freq64_usec * (cv - scv)) >> 32;
825 gd->statint.gd_statcv = cv;
828 stv = &gd->gd_stattv;
829 if (stv->tv_sec == 0) {
832 bump = tv.tv_usec - stv->tv_usec +
833 (tv.tv_sec - stv->tv_sec) * 1000000;
845 if (frame && CLKF_USERMODE(frame)) {
847 * Came from userland, handle user time and deal with
850 if (p && (p->p_flags & P_PROFIL))
851 addupc_intr(p, CLKF_PC(frame), 1);
852 td->td_uticks += bump;
855 * Charge the time as appropriate
857 if (p && p->p_nice > NZERO)
858 cpu_time.cp_nice += bump;
860 cpu_time.cp_user += bump;
862 int intr_nest = gd->gd_intr_nesting_level;
866 * IPI processing code will bump gd_intr_nesting_level
867 * up by one, which breaks following CLKF_INTR testing,
868 * so we subtract it by one here.
874 * Kernel statistics are just like addupc_intr, only easier.
877 if (g->state == GMON_PROF_ON && frame) {
878 i = CLKF_PC(frame) - g->lowpc;
879 if (i < g->textsize) {
880 i /= HISTFRACTION * sizeof(*g->kcount);
886 #define IS_INTR_RUNNING ((frame && CLKF_INTR(intr_nest)) || CLKF_INTR_TD(td))
889 * Came from kernel mode, so we were:
890 * - handling an interrupt,
891 * - doing syscall or trap work on behalf of the current
893 * - spinning in the idle loop.
894 * Whichever it is, charge the time as appropriate.
895 * Note that we charge interrupts to the current process,
896 * regardless of whether they are ``for'' that process,
897 * so that we know how much of its real time was spent
898 * in ``non-process'' (i.e., interrupt) work.
900 * XXX assume system if frame is NULL. A NULL frame
901 * can occur if ipi processing is done from a crit_exit().
903 if (IS_INTR_RUNNING ||
904 (gd->gd_reqflags & RQF_INTPEND)) {
906 * If we interrupted an interrupt thread, well,
907 * count it as interrupt time.
909 td->td_iticks += bump;
912 do_pctrack(frame, PCTRACK_INT);
914 cpu_time.cp_intr += bump;
915 } else if (gd->gd_flags & GDF_VIRTUSER) {
917 * The vkernel doesn't do a good job providing trap
918 * frames that we can test. If the GDF_VIRTUSER
919 * flag is set we probably interrupted user mode.
921 * We also use this flag on the host when entering
924 td->td_uticks += bump;
927 * Charge the time as appropriate
929 if (p && p->p_nice > NZERO)
930 cpu_time.cp_nice += bump;
932 cpu_time.cp_user += bump;
934 td->td_sticks += bump;
935 if (td == &gd->gd_idlethread) {
937 * We want to count token contention as
938 * system time. When token contention occurs
939 * the cpu may only be outside its critical
940 * section while switching through the idle
941 * thread. In this situation, various flags
942 * will be set in gd_reqflags.
944 if (gd->gd_reqflags & RQF_IDLECHECK_WK_MASK)
945 cpu_time.cp_sys += bump;
947 cpu_time.cp_idle += bump;
950 * System thread was running.
954 do_pctrack(frame, PCTRACK_SYS);
956 cpu_time.cp_sys += bump;
960 #undef IS_INTR_RUNNING
966 * Sample the PC when in the kernel or in an interrupt. User code can
967 * retrieve the information and generate a histogram or other output.
971 do_pctrack(struct intrframe *frame, int which)
973 struct kinfo_pctrack *pctrack;
975 pctrack = &cputime_pctrack[mycpu->gd_cpuid][which];
976 pctrack->pc_array[pctrack->pc_index & PCTRACK_ARYMASK] =
977 (void *)CLKF_PC(frame);
982 sysctl_pctrack(SYSCTL_HANDLER_ARGS)
984 struct kinfo_pcheader head;
989 head.pc_ntrack = PCTRACK_SIZE;
990 head.pc_arysize = PCTRACK_ARYSIZE;
992 if ((error = SYSCTL_OUT(req, &head, sizeof(head))) != 0)
995 for (cpu = 0; cpu < ncpus; ++cpu) {
996 for (ntrack = 0; ntrack < PCTRACK_SIZE; ++ntrack) {
997 error = SYSCTL_OUT(req, &cputime_pctrack[cpu][ntrack],
998 sizeof(struct kinfo_pctrack));
1007 SYSCTL_PROC(_kern, OID_AUTO, pctrack, (CTLTYPE_OPAQUE|CTLFLAG_RD), 0, 0,
1008 sysctl_pctrack, "S,kinfo_pcheader", "CPU PC tracking");
1013 * The scheduler clock typically runs at a 50Hz rate. NOTE! systimer,
1014 * the MP lock might not be held. We can safely manipulate parts of curproc
1015 * but that's about it.
1017 * Each cpu has its own scheduler clock.
1020 schedclock(systimer_t info, int in_ipi __unused, struct intrframe *frame)
1027 if ((lp = lwkt_preempted_proc()) != NULL) {
1029 * Account for cpu time used and hit the scheduler. Note
1030 * that this call MUST BE MP SAFE, and the BGL IS NOT HELD
1034 usched_schedulerclock(lp, info->periodic, info->time);
1036 usched_schedulerclock(NULL, info->periodic, info->time);
1038 if ((lp = curthread->td_lwp) != NULL) {
1040 * Update resource usage integrals and maximums.
1042 if ((ru = &lp->lwp_proc->p_ru) &&
1043 (vm = lp->lwp_proc->p_vmspace) != NULL) {
1044 ru->ru_ixrss += pgtok(vm->vm_tsize);
1045 ru->ru_idrss += pgtok(vm->vm_dsize);
1046 ru->ru_isrss += pgtok(vm->vm_ssize);
1047 if (lwkt_trytoken(&vm->vm_map.token)) {
1048 rss = pgtok(vmspace_resident_count(vm));
1049 if (ru->ru_maxrss < rss)
1050 ru->ru_maxrss = rss;
1051 lwkt_reltoken(&vm->vm_map.token);
1055 /* Increment the global sched_ticks */
1056 if (mycpu->gd_cpuid == 0)
1061 * Compute number of ticks for the specified amount of time. The
1062 * return value is intended to be used in a clock interrupt timed
1063 * operation and guaranteed to meet or exceed the requested time.
1064 * If the representation overflows, return INT_MAX. The minimum return
1065 * value is 1 ticks and the function will average the calculation up.
1066 * If any value greater then 0 microseconds is supplied, a value
1067 * of at least 2 will be returned to ensure that a near-term clock
1068 * interrupt does not cause the timeout to occur (degenerately) early.
1070 * Note that limit checks must take into account microseconds, which is
1071 * done simply by using the smaller signed long maximum instead of
1072 * the unsigned long maximum.
1074 * If ints have 32 bits, then the maximum value for any timeout in
1075 * 10ms ticks is 248 days.
1078 tvtohz_high(struct timeval *tv)
1095 kprintf("tvtohz_high: negative time difference "
1096 "%ld sec %ld usec\n",
1100 } else if (sec <= INT_MAX / hz) {
1101 ticks = (int)(sec * hz +
1102 ((u_long)usec + (ustick - 1)) / ustick) + 1;
1110 tstohz_high(struct timespec *ts)
1127 kprintf("tstohz_high: negative time difference "
1128 "%ld sec %ld nsec\n",
1132 } else if (sec <= INT_MAX / hz) {
1133 ticks = (int)(sec * hz +
1134 ((u_long)nsec + (nstick - 1)) / nstick) + 1;
1143 * Compute number of ticks for the specified amount of time, erroring on
1144 * the side of it being too low to ensure that sleeping the returned number
1145 * of ticks will not result in a late return.
1147 * The supplied timeval may not be negative and should be normalized. A
1148 * return value of 0 is possible if the timeval converts to less then
1151 * If ints have 32 bits, then the maximum value for any timeout in
1152 * 10ms ticks is 248 days.
1155 tvtohz_low(struct timeval *tv)
1161 if (sec <= INT_MAX / hz)
1162 ticks = (int)(sec * hz + (u_long)tv->tv_usec / ustick);
1169 tstohz_low(struct timespec *ts)
1175 if (sec <= INT_MAX / hz)
1176 ticks = (int)(sec * hz + (u_long)ts->tv_nsec / nstick);
1183 * Start profiling on a process.
1185 * Caller must hold p->p_token();
1187 * Kernel profiling passes proc0 which never exits and hence
1188 * keeps the profile clock running constantly.
1191 startprofclock(struct proc *p)
1193 if ((p->p_flags & P_PROFIL) == 0) {
1194 p->p_flags |= P_PROFIL;
1196 if (++profprocs == 1 && stathz != 0) {
1199 setstatclockrate(profhz);
1207 * Stop profiling on a process.
1209 * caller must hold p->p_token
1212 stopprofclock(struct proc *p)
1214 if (p->p_flags & P_PROFIL) {
1215 p->p_flags &= ~P_PROFIL;
1217 if (--profprocs == 0 && stathz != 0) {
1220 setstatclockrate(stathz);
1228 * Return information about system clocks.
1231 sysctl_kern_clockrate(SYSCTL_HANDLER_ARGS)
1233 struct kinfo_clockinfo clkinfo;
1235 * Construct clockinfo structure.
1238 clkinfo.ci_tick = ustick;
1239 clkinfo.ci_tickadj = ntp_default_tick_delta / 1000;
1240 clkinfo.ci_profhz = profhz;
1241 clkinfo.ci_stathz = stathz ? stathz : hz;
1242 return (sysctl_handle_opaque(oidp, &clkinfo, sizeof clkinfo, req));
1245 SYSCTL_PROC(_kern, KERN_CLOCKRATE, clockrate, CTLTYPE_STRUCT|CTLFLAG_RD,
1246 0, 0, sysctl_kern_clockrate, "S,clockinfo","");
1249 * We have eight functions for looking at the clock, four for
1250 * microseconds and four for nanoseconds. For each there is fast
1251 * but less precise version "get{nano|micro}[up]time" which will
1252 * return a time which is up to 1/HZ previous to the call, whereas
1253 * the raw version "{nano|micro}[up]time" will return a timestamp
1254 * which is as precise as possible. The "up" variants return the
1255 * time relative to system boot, these are well suited for time
1256 * interval measurements.
1258 * Each cpu independently maintains the current time of day, so all
1259 * we need to do to protect ourselves from changes is to do a loop
1260 * check on the seconds field changing out from under us.
1262 * The system timer maintains a 32 bit count and due to various issues
1263 * it is possible for the calculated delta to occasionally exceed
1264 * sys_cputimer->freq. If this occurs the sys_cputimer->freq64_nsec
1265 * multiplication can easily overflow, so we deal with the case. For
1266 * uniformity we deal with the case in the usec case too.
1268 * All the [get][micro,nano][time,uptime]() routines are MPSAFE.
1271 getmicrouptime(struct timeval *tvp)
1273 struct globaldata *gd = mycpu;
1277 tvp->tv_sec = gd->gd_time_seconds;
1278 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base;
1279 } while (tvp->tv_sec != gd->gd_time_seconds);
1281 if (delta >= sys_cputimer->freq) {
1282 tvp->tv_sec += delta / sys_cputimer->freq;
1283 delta %= sys_cputimer->freq;
1285 tvp->tv_usec = (sys_cputimer->freq64_usec * delta) >> 32;
1286 if (tvp->tv_usec >= 1000000) {
1287 tvp->tv_usec -= 1000000;
1293 getnanouptime(struct timespec *tsp)
1295 struct globaldata *gd = mycpu;
1299 tsp->tv_sec = gd->gd_time_seconds;
1300 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base;
1301 } while (tsp->tv_sec != gd->gd_time_seconds);
1303 if (delta >= sys_cputimer->freq) {
1304 tsp->tv_sec += delta / sys_cputimer->freq;
1305 delta %= sys_cputimer->freq;
1307 tsp->tv_nsec = (sys_cputimer->freq64_nsec * delta) >> 32;
1311 microuptime(struct timeval *tvp)
1313 struct globaldata *gd = mycpu;
1317 tvp->tv_sec = gd->gd_time_seconds;
1318 delta = sys_cputimer->count() - gd->gd_cpuclock_base;
1319 } while (tvp->tv_sec != gd->gd_time_seconds);
1321 if (delta >= sys_cputimer->freq) {
1322 tvp->tv_sec += delta / sys_cputimer->freq;
1323 delta %= sys_cputimer->freq;
1325 tvp->tv_usec = (sys_cputimer->freq64_usec * delta) >> 32;
1329 nanouptime(struct timespec *tsp)
1331 struct globaldata *gd = mycpu;
1335 tsp->tv_sec = gd->gd_time_seconds;
1336 delta = sys_cputimer->count() - gd->gd_cpuclock_base;
1337 } while (tsp->tv_sec != gd->gd_time_seconds);
1339 if (delta >= sys_cputimer->freq) {
1340 tsp->tv_sec += delta / sys_cputimer->freq;
1341 delta %= sys_cputimer->freq;
1343 tsp->tv_nsec = (sys_cputimer->freq64_nsec * delta) >> 32;
1350 getmicrotime(struct timeval *tvp)
1352 struct globaldata *gd = mycpu;
1353 struct timespec *bt;
1357 tvp->tv_sec = gd->gd_time_seconds;
1358 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base;
1359 } while (tvp->tv_sec != gd->gd_time_seconds);
1361 if (delta >= sys_cputimer->freq) {
1362 tvp->tv_sec += delta / sys_cputimer->freq;
1363 delta %= sys_cputimer->freq;
1365 tvp->tv_usec = (sys_cputimer->freq64_usec * delta) >> 32;
1367 bt = &basetime[basetime_index];
1369 tvp->tv_sec += bt->tv_sec;
1370 tvp->tv_usec += bt->tv_nsec / 1000;
1371 while (tvp->tv_usec >= 1000000) {
1372 tvp->tv_usec -= 1000000;
1378 getnanotime(struct timespec *tsp)
1380 struct globaldata *gd = mycpu;
1381 struct timespec *bt;
1385 tsp->tv_sec = gd->gd_time_seconds;
1386 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base;
1387 } while (tsp->tv_sec != gd->gd_time_seconds);
1389 if (delta >= sys_cputimer->freq) {
1390 tsp->tv_sec += delta / sys_cputimer->freq;
1391 delta %= sys_cputimer->freq;
1393 tsp->tv_nsec = (sys_cputimer->freq64_nsec * delta) >> 32;
1395 bt = &basetime[basetime_index];
1397 tsp->tv_sec += bt->tv_sec;
1398 tsp->tv_nsec += bt->tv_nsec;
1399 while (tsp->tv_nsec >= 1000000000) {
1400 tsp->tv_nsec -= 1000000000;
1406 getnanotime_nbt(struct timespec *nbt, struct timespec *tsp)
1408 struct globaldata *gd = mycpu;
1412 tsp->tv_sec = gd->gd_time_seconds;
1413 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base;
1414 } while (tsp->tv_sec != gd->gd_time_seconds);
1416 if (delta >= sys_cputimer->freq) {
1417 tsp->tv_sec += delta / sys_cputimer->freq;
1418 delta %= sys_cputimer->freq;
1420 tsp->tv_nsec = (sys_cputimer->freq64_nsec * delta) >> 32;
1422 tsp->tv_sec += nbt->tv_sec;
1423 tsp->tv_nsec += nbt->tv_nsec;
1424 while (tsp->tv_nsec >= 1000000000) {
1425 tsp->tv_nsec -= 1000000000;
1432 microtime(struct timeval *tvp)
1434 struct globaldata *gd = mycpu;
1435 struct timespec *bt;
1439 tvp->tv_sec = gd->gd_time_seconds;
1440 delta = sys_cputimer->count() - gd->gd_cpuclock_base;
1441 } while (tvp->tv_sec != gd->gd_time_seconds);
1443 if (delta >= sys_cputimer->freq) {
1444 tvp->tv_sec += delta / sys_cputimer->freq;
1445 delta %= sys_cputimer->freq;
1447 tvp->tv_usec = (sys_cputimer->freq64_usec * delta) >> 32;
1449 bt = &basetime[basetime_index];
1451 tvp->tv_sec += bt->tv_sec;
1452 tvp->tv_usec += bt->tv_nsec / 1000;
1453 while (tvp->tv_usec >= 1000000) {
1454 tvp->tv_usec -= 1000000;
1460 nanotime(struct timespec *tsp)
1462 struct globaldata *gd = mycpu;
1463 struct timespec *bt;
1467 tsp->tv_sec = gd->gd_time_seconds;
1468 delta = sys_cputimer->count() - gd->gd_cpuclock_base;
1469 } while (tsp->tv_sec != gd->gd_time_seconds);
1471 if (delta >= sys_cputimer->freq) {
1472 tsp->tv_sec += delta / sys_cputimer->freq;
1473 delta %= sys_cputimer->freq;
1475 tsp->tv_nsec = (sys_cputimer->freq64_nsec * delta) >> 32;
1477 bt = &basetime[basetime_index];
1479 tsp->tv_sec += bt->tv_sec;
1480 tsp->tv_nsec += bt->tv_nsec;
1481 while (tsp->tv_nsec >= 1000000000) {
1482 tsp->tv_nsec -= 1000000000;
1488 * Get an approximate time_t. It does not have to be accurate. This
1489 * function is called only from KTR and can be called with the system in
1490 * any state so do not use a critical section or other complex operation
1493 * NOTE: This is not exactly synchronized with real time. To do that we
1494 * would have to do what microtime does and check for a nanoseconds
1498 get_approximate_time_t(void)
1500 struct globaldata *gd = mycpu;
1501 struct timespec *bt;
1503 bt = &basetime[basetime_index];
1504 return(gd->gd_time_seconds + bt->tv_sec);
1508 pps_ioctl(u_long cmd, caddr_t data, struct pps_state *pps)
1511 struct pps_fetch_args *fapi;
1513 struct pps_kcbind_args *kapi;
1517 case PPS_IOC_CREATE:
1519 case PPS_IOC_DESTROY:
1521 case PPS_IOC_SETPARAMS:
1522 app = (pps_params_t *)data;
1523 if (app->mode & ~pps->ppscap)
1525 pps->ppsparam = *app;
1527 case PPS_IOC_GETPARAMS:
1528 app = (pps_params_t *)data;
1529 *app = pps->ppsparam;
1530 app->api_version = PPS_API_VERS_1;
1532 case PPS_IOC_GETCAP:
1533 *(int*)data = pps->ppscap;
1536 fapi = (struct pps_fetch_args *)data;
1537 if (fapi->tsformat && fapi->tsformat != PPS_TSFMT_TSPEC)
1539 if (fapi->timeout.tv_sec || fapi->timeout.tv_nsec)
1540 return (EOPNOTSUPP);
1541 pps->ppsinfo.current_mode = pps->ppsparam.mode;
1542 fapi->pps_info_buf = pps->ppsinfo;
1544 case PPS_IOC_KCBIND:
1546 kapi = (struct pps_kcbind_args *)data;
1547 /* XXX Only root should be able to do this */
1548 if (kapi->tsformat && kapi->tsformat != PPS_TSFMT_TSPEC)
1550 if (kapi->kernel_consumer != PPS_KC_HARDPPS)
1552 if (kapi->edge & ~pps->ppscap)
1554 pps->kcmode = kapi->edge;
1557 return (EOPNOTSUPP);
1565 pps_init(struct pps_state *pps)
1567 pps->ppscap |= PPS_TSFMT_TSPEC;
1568 if (pps->ppscap & PPS_CAPTUREASSERT)
1569 pps->ppscap |= PPS_OFFSETASSERT;
1570 if (pps->ppscap & PPS_CAPTURECLEAR)
1571 pps->ppscap |= PPS_OFFSETCLEAR;
1575 pps_event(struct pps_state *pps, sysclock_t count, int event)
1577 struct globaldata *gd;
1578 struct timespec *tsp;
1579 struct timespec *osp;
1580 struct timespec *bt;
1596 /* Things would be easier with arrays... */
1597 if (event == PPS_CAPTUREASSERT) {
1598 tsp = &pps->ppsinfo.assert_timestamp;
1599 osp = &pps->ppsparam.assert_offset;
1600 foff = pps->ppsparam.mode & PPS_OFFSETASSERT;
1602 fhard = pps->kcmode & PPS_CAPTUREASSERT;
1604 pcount = &pps->ppscount[0];
1605 pseq = &pps->ppsinfo.assert_sequence;
1607 tsp = &pps->ppsinfo.clear_timestamp;
1608 osp = &pps->ppsparam.clear_offset;
1609 foff = pps->ppsparam.mode & PPS_OFFSETCLEAR;
1611 fhard = pps->kcmode & PPS_CAPTURECLEAR;
1613 pcount = &pps->ppscount[1];
1614 pseq = &pps->ppsinfo.clear_sequence;
1617 /* Nothing really happened */
1618 if (*pcount == count)
1624 ts.tv_sec = gd->gd_time_seconds;
1625 delta = count - gd->gd_cpuclock_base;
1626 } while (ts.tv_sec != gd->gd_time_seconds);
1628 if (delta >= sys_cputimer->freq) {
1629 ts.tv_sec += delta / sys_cputimer->freq;
1630 delta %= sys_cputimer->freq;
1632 ts.tv_nsec = (sys_cputimer->freq64_nsec * delta) >> 32;
1633 ni = basetime_index;
1636 ts.tv_sec += bt->tv_sec;
1637 ts.tv_nsec += bt->tv_nsec;
1638 while (ts.tv_nsec >= 1000000000) {
1639 ts.tv_nsec -= 1000000000;
1647 timespecadd(tsp, osp);
1648 if (tsp->tv_nsec < 0) {
1649 tsp->tv_nsec += 1000000000;
1655 /* magic, at its best... */
1656 tcount = count - pps->ppscount[2];
1657 pps->ppscount[2] = count;
1658 if (tcount >= sys_cputimer->freq) {
1659 delta = (1000000000 * (tcount / sys_cputimer->freq) +
1660 sys_cputimer->freq64_nsec *
1661 (tcount % sys_cputimer->freq)) >> 32;
1663 delta = (sys_cputimer->freq64_nsec * tcount) >> 32;
1665 hardpps(tsp, delta);
1671 * Return the tsc target value for a delay of (ns).
1673 * Returns -1 if the TSC is not supported.
1676 tsc_get_target(int ns)
1678 #if defined(_RDTSC_SUPPORTED_)
1679 if (cpu_feature & CPUID_TSC) {
1680 return (rdtsc() + tsc_frequency * ns / (int64_t)1000000000);
1687 * Compare the tsc against the passed target
1689 * Returns +1 if the target has been reached
1690 * Returns 0 if the target has not yet been reached
1691 * Returns -1 if the TSC is not supported.
1693 * Typical use: while (tsc_test_target(target) == 0) { ...poll... }
1696 tsc_test_target(int64_t target)
1698 #if defined(_RDTSC_SUPPORTED_)
1699 if (cpu_feature & CPUID_TSC) {
1700 if ((int64_t)(target - rdtsc()) <= 0)
1709 * Delay the specified number of nanoseconds using the tsc. This function
1710 * returns immediately if the TSC is not supported. At least one cpu_pause()
1718 clk = tsc_get_target(ns);
1720 while (tsc_test_target(clk) == 0)