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
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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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
39 * to the University of California by American Telephone and Telegraph
40 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
41 * the permission of UNIX System Laboratories, Inc.
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44 * modification, are permitted provided that the following conditions
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50 * documentation and/or other materials provided with the distribution.
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52 * must display the following acknowledgement:
53 * This product includes software developed by the University of
54 * California, Berkeley and its contributors.
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56 * may be used to endorse or promote products derived from this software
57 * without specific prior written permission.
59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
71 * @(#)kern_clock.c 8.5 (Berkeley) 1/21/94
72 * $FreeBSD: src/sys/kern/kern_clock.c,v 1.105.2.10 2002/10/17 13:19:40 maxim Exp $
73 * $DragonFly: src/sys/kern/kern_clock.c,v 1.62 2008/09/09 04:06:13 dillon Exp $
77 #include "opt_polling.h"
78 #include "opt_ifpoll.h"
79 #include "opt_pctrack.h"
81 #include <sys/param.h>
82 #include <sys/systm.h>
83 #include <sys/callout.h>
84 #include <sys/kernel.h>
85 #include <sys/kinfo.h>
87 #include <sys/malloc.h>
88 #include <sys/resourcevar.h>
89 #include <sys/signalvar.h>
90 #include <sys/timex.h>
91 #include <sys/timepps.h>
95 #include <vm/vm_map.h>
96 #include <vm/vm_extern.h>
97 #include <sys/sysctl.h>
99 #include <sys/thread2.h>
100 #include <sys/mplock2.h>
102 #include <machine/cpu.h>
103 #include <machine/limits.h>
104 #include <machine/smp.h>
105 #include <machine/cpufunc.h>
106 #include <machine/specialreg.h>
107 #include <machine/clock.h>
110 #include <sys/gmon.h>
113 #ifdef DEVICE_POLLING
114 extern void init_device_poll_pcpu(int);
118 extern void ifpoll_init_pcpu(int);
122 static void do_pctrack(struct intrframe
*frame
, int which
);
125 static void initclocks (void *dummy
);
126 SYSINIT(clocks
, SI_BOOT2_CLOCKS
, SI_ORDER_FIRST
, initclocks
, NULL
)
129 * Some of these don't belong here, but it's easiest to concentrate them.
130 * Note that cpu_time counts in microseconds, but most userland programs
131 * just compare relative times against the total by delta.
133 struct kinfo_cputime cputime_percpu
[MAXCPU
];
135 struct kinfo_pcheader cputime_pcheader
= { PCTRACK_SIZE
, PCTRACK_ARYSIZE
};
136 struct kinfo_pctrack cputime_pctrack
[MAXCPU
][PCTRACK_SIZE
];
141 sysctl_cputime(SYSCTL_HANDLER_ARGS
)
144 size_t size
= sizeof(struct kinfo_cputime
);
146 for (cpu
= 0; cpu
< ncpus
; ++cpu
) {
147 if ((error
= SYSCTL_OUT(req
, &cputime_percpu
[cpu
], size
)))
153 SYSCTL_PROC(_kern
, OID_AUTO
, cputime
, (CTLTYPE_OPAQUE
|CTLFLAG_RD
), 0, 0,
154 sysctl_cputime
, "S,kinfo_cputime", "CPU time statistics");
156 SYSCTL_STRUCT(_kern
, OID_AUTO
, cputime
, CTLFLAG_RD
, &cpu_time
, kinfo_cputime
,
157 "CPU time statistics");
161 * boottime is used to calculate the 'real' uptime. Do not confuse this with
162 * microuptime(). microtime() is not drift compensated. The real uptime
163 * with compensation is nanotime() - bootime. boottime is recalculated
164 * whenever the real time is set based on the compensated elapsed time
165 * in seconds (gd->gd_time_seconds).
167 * The gd_time_seconds and gd_cpuclock_base fields remain fairly monotonic.
168 * Slight adjustments to gd_cpuclock_base are made to phase-lock it to
171 struct timespec boottime
; /* boot time (realtime) for reference only */
172 time_t time_second
; /* read-only 'passive' uptime in seconds */
175 * basetime is used to calculate the compensated real time of day. The
176 * basetime can be modified on a per-tick basis by the adjtime(),
177 * ntp_adjtime(), and sysctl-based time correction APIs.
179 * Note that frequency corrections can also be made by adjusting
182 * basetime is a tail-chasing FIFO, updated only by cpu #0. The FIFO is
183 * used on both SMP and UP systems to avoid MP races between cpu's and
184 * interrupt races on UP systems.
186 #define BASETIME_ARYSIZE 16
187 #define BASETIME_ARYMASK (BASETIME_ARYSIZE - 1)
188 static struct timespec basetime
[BASETIME_ARYSIZE
];
189 static volatile int basetime_index
;
192 sysctl_get_basetime(SYSCTL_HANDLER_ARGS
)
199 * Because basetime data and index may be updated by another cpu,
200 * a load fence is required to ensure that the data we read has
201 * not been speculatively read relative to a possibly updated index.
203 index
= basetime_index
;
205 bt
= &basetime
[index
];
206 error
= SYSCTL_OUT(req
, bt
, sizeof(*bt
));
210 SYSCTL_STRUCT(_kern
, KERN_BOOTTIME
, boottime
, CTLFLAG_RD
,
211 &boottime
, timespec
, "System boottime");
212 SYSCTL_PROC(_kern
, OID_AUTO
, basetime
, CTLTYPE_STRUCT
|CTLFLAG_RD
, 0, 0,
213 sysctl_get_basetime
, "S,timespec", "System basetime");
215 static void hardclock(systimer_t info
, struct intrframe
*frame
);
216 static void statclock(systimer_t info
, struct intrframe
*frame
);
217 static void schedclock(systimer_t info
, struct intrframe
*frame
);
218 static void getnanotime_nbt(struct timespec
*nbt
, struct timespec
*tsp
);
220 int ticks
; /* system master ticks at hz */
221 int clocks_running
; /* tsleep/timeout clocks operational */
222 int64_t nsec_adj
; /* ntpd per-tick adjustment in nsec << 32 */
223 int64_t nsec_acc
; /* accumulator */
225 /* NTPD time correction fields */
226 int64_t ntp_tick_permanent
; /* per-tick adjustment in nsec << 32 */
227 int64_t ntp_tick_acc
; /* accumulator for per-tick adjustment */
228 int64_t ntp_delta
; /* one-time correction in nsec */
229 int64_t ntp_big_delta
= 1000000000;
230 int32_t ntp_tick_delta
; /* current adjustment rate */
231 int32_t ntp_default_tick_delta
; /* adjustment rate for ntp_delta */
232 time_t ntp_leap_second
; /* time of next leap second */
233 int ntp_leap_insert
; /* whether to insert or remove a second */
236 * Finish initializing clock frequencies and start all clocks running.
240 initclocks(void *dummy
)
242 /*psratio = profhz / stathz;*/
248 * Called on a per-cpu basis
251 initclocks_pcpu(void)
253 struct globaldata
*gd
= mycpu
;
256 if (gd
->gd_cpuid
== 0) {
257 gd
->gd_time_seconds
= 1;
258 gd
->gd_cpuclock_base
= sys_cputimer
->count();
261 gd
->gd_time_seconds
= globaldata_find(0)->gd_time_seconds
;
262 gd
->gd_cpuclock_base
= globaldata_find(0)->gd_cpuclock_base
;
265 systimer_intr_enable();
267 #ifdef DEVICE_POLLING
268 init_device_poll_pcpu(gd
->gd_cpuid
);
272 ifpoll_init_pcpu(gd
->gd_cpuid
);
276 * Use a non-queued periodic systimer to prevent multiple ticks from
277 * building up if the sysclock jumps forward (8254 gets reset). The
278 * sysclock will never jump backwards. Our time sync is based on
279 * the actual sysclock, not the ticks count.
281 systimer_init_periodic_nq(&gd
->gd_hardclock
, hardclock
, NULL
, hz
);
282 systimer_init_periodic_nq(&gd
->gd_statclock
, statclock
, NULL
, stathz
);
283 /* XXX correct the frequency for scheduler / estcpu tests */
284 systimer_init_periodic_nq(&gd
->gd_schedclock
, schedclock
,
290 * This sets the current real time of day. Timespecs are in seconds and
291 * nanoseconds. We do not mess with gd_time_seconds and gd_cpuclock_base,
292 * instead we adjust basetime so basetime + gd_* results in the current
293 * time of day. This way the gd_* fields are guarenteed to represent
294 * a monotonically increasing 'uptime' value.
296 * When set_timeofday() is called from userland, the system call forces it
297 * onto cpu #0 since only cpu #0 can update basetime_index.
300 set_timeofday(struct timespec
*ts
)
302 struct timespec
*nbt
;
306 * XXX SMP / non-atomic basetime updates
309 ni
= (basetime_index
+ 1) & BASETIME_ARYMASK
;
312 nbt
->tv_sec
= ts
->tv_sec
- nbt
->tv_sec
;
313 nbt
->tv_nsec
= ts
->tv_nsec
- nbt
->tv_nsec
;
314 if (nbt
->tv_nsec
< 0) {
315 nbt
->tv_nsec
+= 1000000000;
320 * Note that basetime diverges from boottime as the clock drift is
321 * compensated for, so we cannot do away with boottime. When setting
322 * the absolute time of day the drift is 0 (for an instant) and we
323 * can simply assign boottime to basetime.
325 * Note that nanouptime() is based on gd_time_seconds which is drift
326 * compensated up to a point (it is guarenteed to remain monotonically
327 * increasing). gd_time_seconds is thus our best uptime guess and
328 * suitable for use in the boottime calculation. It is already taken
329 * into account in the basetime calculation above.
331 boottime
.tv_sec
= nbt
->tv_sec
;
335 * We now have a new basetime, make sure all other cpus have it,
336 * then update the index.
345 * Each cpu has its own hardclock, but we only increments ticks and softticks
348 * NOTE! systimer! the MP lock might not be held here. We can only safely
349 * manipulate objects owned by the current cpu.
352 hardclock(systimer_t info
, struct intrframe
*frame
)
356 struct globaldata
*gd
= mycpu
;
359 * Realtime updates are per-cpu. Note that timer corrections as
360 * returned by microtime() and friends make an additional adjustment
361 * using a system-wise 'basetime', but the running time is always
362 * taken from the per-cpu globaldata area. Since the same clock
363 * is distributing (XXX SMP) to all cpus, the per-cpu timebases
366 * Note that we never allow info->time (aka gd->gd_hardclock.time)
367 * to reverse index gd_cpuclock_base, but that it is possible for
368 * it to temporarily get behind in the seconds if something in the
369 * system locks interrupts for a long period of time. Since periodic
370 * timers count events, though everything should resynch again
373 cputicks
= info
->time
- gd
->gd_cpuclock_base
;
374 if (cputicks
>= sys_cputimer
->freq
) {
375 ++gd
->gd_time_seconds
;
376 gd
->gd_cpuclock_base
+= sys_cputimer
->freq
;
380 * The system-wide ticks counter and NTP related timedelta/tickdelta
381 * adjustments only occur on cpu #0. NTP adjustments are accomplished
382 * by updating basetime.
384 if (gd
->gd_cpuid
== 0) {
385 struct timespec
*nbt
;
393 if (tco
->tc_poll_pps
)
394 tco
->tc_poll_pps(tco
);
398 * Calculate the new basetime index. We are in a critical section
399 * on cpu #0 and can safely play with basetime_index. Start
400 * with the current basetime and then make adjustments.
402 ni
= (basetime_index
+ 1) & BASETIME_ARYMASK
;
404 *nbt
= basetime
[basetime_index
];
407 * Apply adjtime corrections. (adjtime() API)
409 * adjtime() only runs on cpu #0 so our critical section is
410 * sufficient to access these variables.
412 if (ntp_delta
!= 0) {
413 nbt
->tv_nsec
+= ntp_tick_delta
;
414 ntp_delta
-= ntp_tick_delta
;
415 if ((ntp_delta
> 0 && ntp_delta
< ntp_tick_delta
) ||
416 (ntp_delta
< 0 && ntp_delta
> ntp_tick_delta
)) {
417 ntp_tick_delta
= ntp_delta
;
422 * Apply permanent frequency corrections. (sysctl API)
424 if (ntp_tick_permanent
!= 0) {
425 ntp_tick_acc
+= ntp_tick_permanent
;
426 if (ntp_tick_acc
>= (1LL << 32)) {
427 nbt
->tv_nsec
+= ntp_tick_acc
>> 32;
428 ntp_tick_acc
-= (ntp_tick_acc
>> 32) << 32;
429 } else if (ntp_tick_acc
<= -(1LL << 32)) {
430 /* Negate ntp_tick_acc to avoid shifting the sign bit. */
431 nbt
->tv_nsec
-= (-ntp_tick_acc
) >> 32;
432 ntp_tick_acc
+= ((-ntp_tick_acc
) >> 32) << 32;
436 if (nbt
->tv_nsec
>= 1000000000) {
438 nbt
->tv_nsec
-= 1000000000;
439 } else if (nbt
->tv_nsec
< 0) {
441 nbt
->tv_nsec
+= 1000000000;
445 * Another per-tick compensation. (for ntp_adjtime() API)
448 nsec_acc
+= nsec_adj
;
449 if (nsec_acc
>= 0x100000000LL
) {
450 nbt
->tv_nsec
+= nsec_acc
>> 32;
451 nsec_acc
= (nsec_acc
& 0xFFFFFFFFLL
);
452 } else if (nsec_acc
<= -0x100000000LL
) {
453 nbt
->tv_nsec
-= -nsec_acc
>> 32;
454 nsec_acc
= -(-nsec_acc
& 0xFFFFFFFFLL
);
456 if (nbt
->tv_nsec
>= 1000000000) {
457 nbt
->tv_nsec
-= 1000000000;
459 } else if (nbt
->tv_nsec
< 0) {
460 nbt
->tv_nsec
+= 1000000000;
465 /************************************************************
466 * LEAP SECOND CORRECTION *
467 ************************************************************
469 * Taking into account all the corrections made above, figure
470 * out the new real time. If the seconds field has changed
471 * then apply any pending leap-second corrections.
473 getnanotime_nbt(nbt
, &nts
);
475 if (time_second
!= nts
.tv_sec
) {
477 * Apply leap second (sysctl API). Adjust nts for changes
478 * so we do not have to call getnanotime_nbt again.
480 if (ntp_leap_second
) {
481 if (ntp_leap_second
== nts
.tv_sec
) {
482 if (ntp_leap_insert
) {
494 * Apply leap second (ntp_adjtime() API), calculate a new
495 * nsec_adj field. ntp_update_second() returns nsec_adj
496 * as a per-second value but we need it as a per-tick value.
498 leap
= ntp_update_second(time_second
, &nsec_adj
);
504 * Update the time_second 'approximate time' global.
506 time_second
= nts
.tv_sec
;
510 * Finally, our new basetime is ready to go live!
516 * Figure out how badly the system is starved for memory
518 vm_fault_ratecheck();
522 * softticks are handled for all cpus
524 hardclock_softtick(gd
);
527 * The LWKT scheduler will generally allow the current process to
528 * return to user mode even if there are other runnable LWKT threads
529 * running in kernel mode on behalf of a user process. This will
530 * ensure that those other threads have an opportunity to run in
531 * fairly short order (but not instantly).
536 * ITimer handling is per-tick, per-cpu. I don't think ksignal()
537 * is mpsafe on curproc, so XXX get the mplock.
539 if ((p
= curproc
) != NULL
&& try_mplock()) {
540 if (frame
&& CLKF_USERMODE(frame
) &&
541 timevalisset(&p
->p_timer
[ITIMER_VIRTUAL
].it_value
) &&
542 itimerdecr(&p
->p_timer
[ITIMER_VIRTUAL
], ustick
) == 0)
543 ksignal(p
, SIGVTALRM
);
544 if (timevalisset(&p
->p_timer
[ITIMER_PROF
].it_value
) &&
545 itimerdecr(&p
->p_timer
[ITIMER_PROF
], ustick
) == 0)
553 * The statistics clock typically runs at a 125Hz rate, and is intended
554 * to be frequency offset from the hardclock (typ 100Hz). It is per-cpu.
556 * NOTE! systimer! the MP lock might not be held here. We can only safely
557 * manipulate objects owned by the current cpu.
559 * The stats clock is responsible for grabbing a profiling sample.
560 * Most of the statistics are only used by user-level statistics programs.
561 * The main exceptions are p->p_uticks, p->p_sticks, p->p_iticks, and
564 * Like the other clocks, the stat clock is called from what is effectively
565 * a fast interrupt, so the context should be the thread/process that got
569 statclock(systimer_t info
, struct intrframe
*frame
)
582 * How big was our timeslice relative to the last time?
584 microuptime(&tv
); /* mpsafe */
585 stv
= &mycpu
->gd_stattv
;
586 if (stv
->tv_sec
== 0) {
589 bump
= tv
.tv_usec
- stv
->tv_usec
+
590 (tv
.tv_sec
- stv
->tv_sec
) * 1000000;
601 if (frame
&& CLKF_USERMODE(frame
)) {
603 * Came from userland, handle user time and deal with
606 if (p
&& (p
->p_flag
& P_PROFIL
))
607 addupc_intr(p
, CLKF_PC(frame
), 1);
608 td
->td_uticks
+= bump
;
611 * Charge the time as appropriate
613 if (p
&& p
->p_nice
> NZERO
)
614 cpu_time
.cp_nice
+= bump
;
616 cpu_time
.cp_user
+= bump
;
620 * Kernel statistics are just like addupc_intr, only easier.
623 if (g
->state
== GMON_PROF_ON
&& frame
) {
624 i
= CLKF_PC(frame
) - g
->lowpc
;
625 if (i
< g
->textsize
) {
626 i
/= HISTFRACTION
* sizeof(*g
->kcount
);
632 * Came from kernel mode, so we were:
633 * - handling an interrupt,
634 * - doing syscall or trap work on behalf of the current
636 * - spinning in the idle loop.
637 * Whichever it is, charge the time as appropriate.
638 * Note that we charge interrupts to the current process,
639 * regardless of whether they are ``for'' that process,
640 * so that we know how much of its real time was spent
641 * in ``non-process'' (i.e., interrupt) work.
643 * XXX assume system if frame is NULL. A NULL frame
644 * can occur if ipi processing is done from a crit_exit().
646 if (frame
&& CLKF_INTR(frame
))
647 td
->td_iticks
+= bump
;
649 td
->td_sticks
+= bump
;
651 if (frame
&& CLKF_INTR(frame
)) {
653 do_pctrack(frame
, PCTRACK_INT
);
655 cpu_time
.cp_intr
+= bump
;
657 if (td
== &mycpu
->gd_idlethread
) {
658 cpu_time
.cp_idle
+= bump
;
662 do_pctrack(frame
, PCTRACK_SYS
);
664 cpu_time
.cp_sys
+= bump
;
672 * Sample the PC when in the kernel or in an interrupt. User code can
673 * retrieve the information and generate a histogram or other output.
677 do_pctrack(struct intrframe
*frame
, int which
)
679 struct kinfo_pctrack
*pctrack
;
681 pctrack
= &cputime_pctrack
[mycpu
->gd_cpuid
][which
];
682 pctrack
->pc_array
[pctrack
->pc_index
& PCTRACK_ARYMASK
] =
683 (void *)CLKF_PC(frame
);
688 sysctl_pctrack(SYSCTL_HANDLER_ARGS
)
690 struct kinfo_pcheader head
;
695 head
.pc_ntrack
= PCTRACK_SIZE
;
696 head
.pc_arysize
= PCTRACK_ARYSIZE
;
698 if ((error
= SYSCTL_OUT(req
, &head
, sizeof(head
))) != 0)
701 for (cpu
= 0; cpu
< ncpus
; ++cpu
) {
702 for (ntrack
= 0; ntrack
< PCTRACK_SIZE
; ++ntrack
) {
703 error
= SYSCTL_OUT(req
, &cputime_pctrack
[cpu
][ntrack
],
704 sizeof(struct kinfo_pctrack
));
713 SYSCTL_PROC(_kern
, OID_AUTO
, pctrack
, (CTLTYPE_OPAQUE
|CTLFLAG_RD
), 0, 0,
714 sysctl_pctrack
, "S,kinfo_pcheader", "CPU PC tracking");
719 * The scheduler clock typically runs at a 50Hz rate. NOTE! systimer,
720 * the MP lock might not be held. We can safely manipulate parts of curproc
721 * but that's about it.
723 * Each cpu has its own scheduler clock.
726 schedclock(systimer_t info
, struct intrframe
*frame
)
733 if ((lp
= lwkt_preempted_proc()) != NULL
) {
735 * Account for cpu time used and hit the scheduler. Note
736 * that this call MUST BE MP SAFE, and the BGL IS NOT HELD
740 lp
->lwp_proc
->p_usched
->schedulerclock(lp
, info
->periodic
,
743 if ((lp
= curthread
->td_lwp
) != NULL
) {
745 * Update resource usage integrals and maximums.
747 if ((ru
= &lp
->lwp_proc
->p_ru
) &&
748 (vm
= lp
->lwp_proc
->p_vmspace
) != NULL
) {
749 ru
->ru_ixrss
+= pgtok(vm
->vm_tsize
);
750 ru
->ru_idrss
+= pgtok(vm
->vm_dsize
);
751 ru
->ru_isrss
+= pgtok(vm
->vm_ssize
);
752 rss
= pgtok(vmspace_resident_count(vm
));
753 if (ru
->ru_maxrss
< rss
)
760 * Compute number of ticks for the specified amount of time. The
761 * return value is intended to be used in a clock interrupt timed
762 * operation and guarenteed to meet or exceed the requested time.
763 * If the representation overflows, return INT_MAX. The minimum return
764 * value is 1 ticks and the function will average the calculation up.
765 * If any value greater then 0 microseconds is supplied, a value
766 * of at least 2 will be returned to ensure that a near-term clock
767 * interrupt does not cause the timeout to occur (degenerately) early.
769 * Note that limit checks must take into account microseconds, which is
770 * done simply by using the smaller signed long maximum instead of
771 * the unsigned long maximum.
773 * If ints have 32 bits, then the maximum value for any timeout in
774 * 10ms ticks is 248 days.
777 tvtohz_high(struct timeval
*tv
)
794 kprintf("tvtohz_high: negative time difference "
795 "%ld sec %ld usec\n",
799 } else if (sec
<= INT_MAX
/ hz
) {
800 ticks
= (int)(sec
* hz
+
801 ((u_long
)usec
+ (ustick
- 1)) / ustick
) + 1;
809 tstohz_high(struct timespec
*ts
)
826 kprintf("tstohz_high: negative time difference "
827 "%ld sec %ld nsec\n",
831 } else if (sec
<= INT_MAX
/ hz
) {
832 ticks
= (int)(sec
* hz
+
833 ((u_long
)nsec
+ (nstick
- 1)) / nstick
) + 1;
842 * Compute number of ticks for the specified amount of time, erroring on
843 * the side of it being too low to ensure that sleeping the returned number
844 * of ticks will not result in a late return.
846 * The supplied timeval may not be negative and should be normalized. A
847 * return value of 0 is possible if the timeval converts to less then
850 * If ints have 32 bits, then the maximum value for any timeout in
851 * 10ms ticks is 248 days.
854 tvtohz_low(struct timeval
*tv
)
860 if (sec
<= INT_MAX
/ hz
)
861 ticks
= (int)(sec
* hz
+ (u_long
)tv
->tv_usec
/ ustick
);
868 tstohz_low(struct timespec
*ts
)
874 if (sec
<= INT_MAX
/ hz
)
875 ticks
= (int)(sec
* hz
+ (u_long
)ts
->tv_nsec
/ nstick
);
882 * Start profiling on a process.
884 * Kernel profiling passes proc0 which never exits and hence
885 * keeps the profile clock running constantly.
888 startprofclock(struct proc
*p
)
890 if ((p
->p_flag
& P_PROFIL
) == 0) {
891 p
->p_flag
|= P_PROFIL
;
893 if (++profprocs
== 1 && stathz
!= 0) {
896 setstatclockrate(profhz
);
904 * Stop profiling on a process.
907 stopprofclock(struct proc
*p
)
909 if (p
->p_flag
& P_PROFIL
) {
910 p
->p_flag
&= ~P_PROFIL
;
912 if (--profprocs
== 0 && stathz
!= 0) {
915 setstatclockrate(stathz
);
923 * Return information about system clocks.
926 sysctl_kern_clockrate(SYSCTL_HANDLER_ARGS
)
928 struct kinfo_clockinfo clkinfo
;
930 * Construct clockinfo structure.
933 clkinfo
.ci_tick
= ustick
;
934 clkinfo
.ci_tickadj
= ntp_default_tick_delta
/ 1000;
935 clkinfo
.ci_profhz
= profhz
;
936 clkinfo
.ci_stathz
= stathz
? stathz
: hz
;
937 return (sysctl_handle_opaque(oidp
, &clkinfo
, sizeof clkinfo
, req
));
940 SYSCTL_PROC(_kern
, KERN_CLOCKRATE
, clockrate
, CTLTYPE_STRUCT
|CTLFLAG_RD
,
941 0, 0, sysctl_kern_clockrate
, "S,clockinfo","");
944 * We have eight functions for looking at the clock, four for
945 * microseconds and four for nanoseconds. For each there is fast
946 * but less precise version "get{nano|micro}[up]time" which will
947 * return a time which is up to 1/HZ previous to the call, whereas
948 * the raw version "{nano|micro}[up]time" will return a timestamp
949 * which is as precise as possible. The "up" variants return the
950 * time relative to system boot, these are well suited for time
951 * interval measurements.
953 * Each cpu independantly maintains the current time of day, so all
954 * we need to do to protect ourselves from changes is to do a loop
955 * check on the seconds field changing out from under us.
957 * The system timer maintains a 32 bit count and due to various issues
958 * it is possible for the calculated delta to occassionally exceed
959 * sys_cputimer->freq. If this occurs the sys_cputimer->freq64_nsec
960 * multiplication can easily overflow, so we deal with the case. For
961 * uniformity we deal with the case in the usec case too.
963 * All the [get][micro,nano][time,uptime]() routines are MPSAFE.
966 getmicrouptime(struct timeval
*tvp
)
968 struct globaldata
*gd
= mycpu
;
972 tvp
->tv_sec
= gd
->gd_time_seconds
;
973 delta
= gd
->gd_hardclock
.time
- gd
->gd_cpuclock_base
;
974 } while (tvp
->tv_sec
!= gd
->gd_time_seconds
);
976 if (delta
>= sys_cputimer
->freq
) {
977 tvp
->tv_sec
+= delta
/ sys_cputimer
->freq
;
978 delta
%= sys_cputimer
->freq
;
980 tvp
->tv_usec
= (sys_cputimer
->freq64_usec
* delta
) >> 32;
981 if (tvp
->tv_usec
>= 1000000) {
982 tvp
->tv_usec
-= 1000000;
988 getnanouptime(struct timespec
*tsp
)
990 struct globaldata
*gd
= mycpu
;
994 tsp
->tv_sec
= gd
->gd_time_seconds
;
995 delta
= gd
->gd_hardclock
.time
- gd
->gd_cpuclock_base
;
996 } while (tsp
->tv_sec
!= gd
->gd_time_seconds
);
998 if (delta
>= sys_cputimer
->freq
) {
999 tsp
->tv_sec
+= delta
/ sys_cputimer
->freq
;
1000 delta
%= sys_cputimer
->freq
;
1002 tsp
->tv_nsec
= (sys_cputimer
->freq64_nsec
* delta
) >> 32;
1006 microuptime(struct timeval
*tvp
)
1008 struct globaldata
*gd
= mycpu
;
1012 tvp
->tv_sec
= gd
->gd_time_seconds
;
1013 delta
= sys_cputimer
->count() - gd
->gd_cpuclock_base
;
1014 } while (tvp
->tv_sec
!= gd
->gd_time_seconds
);
1016 if (delta
>= sys_cputimer
->freq
) {
1017 tvp
->tv_sec
+= delta
/ sys_cputimer
->freq
;
1018 delta
%= sys_cputimer
->freq
;
1020 tvp
->tv_usec
= (sys_cputimer
->freq64_usec
* delta
) >> 32;
1024 nanouptime(struct timespec
*tsp
)
1026 struct globaldata
*gd
= mycpu
;
1030 tsp
->tv_sec
= gd
->gd_time_seconds
;
1031 delta
= sys_cputimer
->count() - gd
->gd_cpuclock_base
;
1032 } while (tsp
->tv_sec
!= gd
->gd_time_seconds
);
1034 if (delta
>= sys_cputimer
->freq
) {
1035 tsp
->tv_sec
+= delta
/ sys_cputimer
->freq
;
1036 delta
%= sys_cputimer
->freq
;
1038 tsp
->tv_nsec
= (sys_cputimer
->freq64_nsec
* delta
) >> 32;
1045 getmicrotime(struct timeval
*tvp
)
1047 struct globaldata
*gd
= mycpu
;
1048 struct timespec
*bt
;
1052 tvp
->tv_sec
= gd
->gd_time_seconds
;
1053 delta
= gd
->gd_hardclock
.time
- gd
->gd_cpuclock_base
;
1054 } while (tvp
->tv_sec
!= gd
->gd_time_seconds
);
1056 if (delta
>= sys_cputimer
->freq
) {
1057 tvp
->tv_sec
+= delta
/ sys_cputimer
->freq
;
1058 delta
%= sys_cputimer
->freq
;
1060 tvp
->tv_usec
= (sys_cputimer
->freq64_usec
* delta
) >> 32;
1062 bt
= &basetime
[basetime_index
];
1063 tvp
->tv_sec
+= bt
->tv_sec
;
1064 tvp
->tv_usec
+= bt
->tv_nsec
/ 1000;
1065 while (tvp
->tv_usec
>= 1000000) {
1066 tvp
->tv_usec
-= 1000000;
1072 getnanotime(struct timespec
*tsp
)
1074 struct globaldata
*gd
= mycpu
;
1075 struct timespec
*bt
;
1079 tsp
->tv_sec
= gd
->gd_time_seconds
;
1080 delta
= gd
->gd_hardclock
.time
- gd
->gd_cpuclock_base
;
1081 } while (tsp
->tv_sec
!= gd
->gd_time_seconds
);
1083 if (delta
>= sys_cputimer
->freq
) {
1084 tsp
->tv_sec
+= delta
/ sys_cputimer
->freq
;
1085 delta
%= sys_cputimer
->freq
;
1087 tsp
->tv_nsec
= (sys_cputimer
->freq64_nsec
* delta
) >> 32;
1089 bt
= &basetime
[basetime_index
];
1090 tsp
->tv_sec
+= bt
->tv_sec
;
1091 tsp
->tv_nsec
+= bt
->tv_nsec
;
1092 while (tsp
->tv_nsec
>= 1000000000) {
1093 tsp
->tv_nsec
-= 1000000000;
1099 getnanotime_nbt(struct timespec
*nbt
, struct timespec
*tsp
)
1101 struct globaldata
*gd
= mycpu
;
1105 tsp
->tv_sec
= gd
->gd_time_seconds
;
1106 delta
= gd
->gd_hardclock
.time
- gd
->gd_cpuclock_base
;
1107 } while (tsp
->tv_sec
!= gd
->gd_time_seconds
);
1109 if (delta
>= sys_cputimer
->freq
) {
1110 tsp
->tv_sec
+= delta
/ sys_cputimer
->freq
;
1111 delta
%= sys_cputimer
->freq
;
1113 tsp
->tv_nsec
= (sys_cputimer
->freq64_nsec
* delta
) >> 32;
1115 tsp
->tv_sec
+= nbt
->tv_sec
;
1116 tsp
->tv_nsec
+= nbt
->tv_nsec
;
1117 while (tsp
->tv_nsec
>= 1000000000) {
1118 tsp
->tv_nsec
-= 1000000000;
1125 microtime(struct timeval
*tvp
)
1127 struct globaldata
*gd
= mycpu
;
1128 struct timespec
*bt
;
1132 tvp
->tv_sec
= gd
->gd_time_seconds
;
1133 delta
= sys_cputimer
->count() - gd
->gd_cpuclock_base
;
1134 } while (tvp
->tv_sec
!= gd
->gd_time_seconds
);
1136 if (delta
>= sys_cputimer
->freq
) {
1137 tvp
->tv_sec
+= delta
/ sys_cputimer
->freq
;
1138 delta
%= sys_cputimer
->freq
;
1140 tvp
->tv_usec
= (sys_cputimer
->freq64_usec
* delta
) >> 32;
1142 bt
= &basetime
[basetime_index
];
1143 tvp
->tv_sec
+= bt
->tv_sec
;
1144 tvp
->tv_usec
+= bt
->tv_nsec
/ 1000;
1145 while (tvp
->tv_usec
>= 1000000) {
1146 tvp
->tv_usec
-= 1000000;
1152 nanotime(struct timespec
*tsp
)
1154 struct globaldata
*gd
= mycpu
;
1155 struct timespec
*bt
;
1159 tsp
->tv_sec
= gd
->gd_time_seconds
;
1160 delta
= sys_cputimer
->count() - gd
->gd_cpuclock_base
;
1161 } while (tsp
->tv_sec
!= gd
->gd_time_seconds
);
1163 if (delta
>= sys_cputimer
->freq
) {
1164 tsp
->tv_sec
+= delta
/ sys_cputimer
->freq
;
1165 delta
%= sys_cputimer
->freq
;
1167 tsp
->tv_nsec
= (sys_cputimer
->freq64_nsec
* delta
) >> 32;
1169 bt
= &basetime
[basetime_index
];
1170 tsp
->tv_sec
+= bt
->tv_sec
;
1171 tsp
->tv_nsec
+= bt
->tv_nsec
;
1172 while (tsp
->tv_nsec
>= 1000000000) {
1173 tsp
->tv_nsec
-= 1000000000;
1179 * note: this is not exactly synchronized with real time. To do that we
1180 * would have to do what microtime does and check for a nanoseconds overflow.
1183 get_approximate_time_t(void)
1185 struct globaldata
*gd
= mycpu
;
1186 struct timespec
*bt
;
1188 bt
= &basetime
[basetime_index
];
1189 return(gd
->gd_time_seconds
+ bt
->tv_sec
);
1193 pps_ioctl(u_long cmd
, caddr_t data
, struct pps_state
*pps
)
1196 struct pps_fetch_args
*fapi
;
1198 struct pps_kcbind_args
*kapi
;
1202 case PPS_IOC_CREATE
:
1204 case PPS_IOC_DESTROY
:
1206 case PPS_IOC_SETPARAMS
:
1207 app
= (pps_params_t
*)data
;
1208 if (app
->mode
& ~pps
->ppscap
)
1210 pps
->ppsparam
= *app
;
1212 case PPS_IOC_GETPARAMS
:
1213 app
= (pps_params_t
*)data
;
1214 *app
= pps
->ppsparam
;
1215 app
->api_version
= PPS_API_VERS_1
;
1217 case PPS_IOC_GETCAP
:
1218 *(int*)data
= pps
->ppscap
;
1221 fapi
= (struct pps_fetch_args
*)data
;
1222 if (fapi
->tsformat
&& fapi
->tsformat
!= PPS_TSFMT_TSPEC
)
1224 if (fapi
->timeout
.tv_sec
|| fapi
->timeout
.tv_nsec
)
1225 return (EOPNOTSUPP
);
1226 pps
->ppsinfo
.current_mode
= pps
->ppsparam
.mode
;
1227 fapi
->pps_info_buf
= pps
->ppsinfo
;
1229 case PPS_IOC_KCBIND
:
1231 kapi
= (struct pps_kcbind_args
*)data
;
1232 /* XXX Only root should be able to do this */
1233 if (kapi
->tsformat
&& kapi
->tsformat
!= PPS_TSFMT_TSPEC
)
1235 if (kapi
->kernel_consumer
!= PPS_KC_HARDPPS
)
1237 if (kapi
->edge
& ~pps
->ppscap
)
1239 pps
->kcmode
= kapi
->edge
;
1242 return (EOPNOTSUPP
);
1250 pps_init(struct pps_state
*pps
)
1252 pps
->ppscap
|= PPS_TSFMT_TSPEC
;
1253 if (pps
->ppscap
& PPS_CAPTUREASSERT
)
1254 pps
->ppscap
|= PPS_OFFSETASSERT
;
1255 if (pps
->ppscap
& PPS_CAPTURECLEAR
)
1256 pps
->ppscap
|= PPS_OFFSETCLEAR
;
1260 pps_event(struct pps_state
*pps
, sysclock_t count
, int event
)
1262 struct globaldata
*gd
;
1263 struct timespec
*tsp
;
1264 struct timespec
*osp
;
1265 struct timespec
*bt
;
1278 /* Things would be easier with arrays... */
1279 if (event
== PPS_CAPTUREASSERT
) {
1280 tsp
= &pps
->ppsinfo
.assert_timestamp
;
1281 osp
= &pps
->ppsparam
.assert_offset
;
1282 foff
= pps
->ppsparam
.mode
& PPS_OFFSETASSERT
;
1283 fhard
= pps
->kcmode
& PPS_CAPTUREASSERT
;
1284 pcount
= &pps
->ppscount
[0];
1285 pseq
= &pps
->ppsinfo
.assert_sequence
;
1287 tsp
= &pps
->ppsinfo
.clear_timestamp
;
1288 osp
= &pps
->ppsparam
.clear_offset
;
1289 foff
= pps
->ppsparam
.mode
& PPS_OFFSETCLEAR
;
1290 fhard
= pps
->kcmode
& PPS_CAPTURECLEAR
;
1291 pcount
= &pps
->ppscount
[1];
1292 pseq
= &pps
->ppsinfo
.clear_sequence
;
1295 /* Nothing really happened */
1296 if (*pcount
== count
)
1302 ts
.tv_sec
= gd
->gd_time_seconds
;
1303 delta
= count
- gd
->gd_cpuclock_base
;
1304 } while (ts
.tv_sec
!= gd
->gd_time_seconds
);
1306 if (delta
>= sys_cputimer
->freq
) {
1307 ts
.tv_sec
+= delta
/ sys_cputimer
->freq
;
1308 delta
%= sys_cputimer
->freq
;
1310 ts
.tv_nsec
= (sys_cputimer
->freq64_nsec
* delta
) >> 32;
1311 bt
= &basetime
[basetime_index
];
1312 ts
.tv_sec
+= bt
->tv_sec
;
1313 ts
.tv_nsec
+= bt
->tv_nsec
;
1314 while (ts
.tv_nsec
>= 1000000000) {
1315 ts
.tv_nsec
-= 1000000000;
1323 timespecadd(tsp
, osp
);
1324 if (tsp
->tv_nsec
< 0) {
1325 tsp
->tv_nsec
+= 1000000000;
1331 /* magic, at its best... */
1332 tcount
= count
- pps
->ppscount
[2];
1333 pps
->ppscount
[2] = count
;
1334 if (tcount
>= sys_cputimer
->freq
) {
1335 delta
= (1000000000 * (tcount
/ sys_cputimer
->freq
) +
1336 sys_cputimer
->freq64_nsec
*
1337 (tcount
% sys_cputimer
->freq
)) >> 32;
1339 delta
= (sys_cputimer
->freq64_nsec
* tcount
) >> 32;
1341 hardpps(tsp
, delta
);
1347 * Return the tsc target value for a delay of (ns).
1349 * Returns -1 if the TSC is not supported.
1352 tsc_get_target(int ns
)
1354 #if defined(_RDTSC_SUPPORTED_)
1355 if (cpu_feature
& CPUID_TSC
) {
1356 return (rdtsc() + tsc_frequency
* ns
/ (int64_t)1000000000);
1363 * Compare the tsc against the passed target
1365 * Returns +1 if the target has been reached
1366 * Returns 0 if the target has not yet been reached
1367 * Returns -1 if the TSC is not supported.
1369 * Typical use: while (tsc_test_target(target) == 0) { ...poll... }
1372 tsc_test_target(int64_t target
)
1374 #if defined(_RDTSC_SUPPORTED_)
1375 if (cpu_feature
& CPUID_TSC
) {
1376 if ((int64_t)(target
- rdtsc()) <= 0)