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,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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.
43 * Redistribution and use in source and binary forms, with or without
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. All advertising materials mentioning features or use of this software
52 * must display the following acknowledgement:
53 * This product includes software developed by the University of
54 * California, Berkeley and its contributors.
55 * 4. Neither the name of the University nor the names of its contributors
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 1.59 2007/06/30 21:52:19 swildner Exp $
77 #include "opt_polling.h"
78 #include "opt_pctrack.h"
80 #include <sys/param.h>
81 #include <sys/systm.h>
82 #include <sys/callout.h>
83 #include <sys/kernel.h>
84 #include <sys/kinfo.h>
86 #include <sys/malloc.h>
87 #include <sys/resourcevar.h>
88 #include <sys/signalvar.h>
89 #include <sys/timex.h>
90 #include <sys/timepps.h>
94 #include <vm/vm_map.h>
95 #include <vm/vm_extern.h>
96 #include <sys/sysctl.h>
97 #include <sys/thread2.h>
99 #include <machine/cpu.h>
100 #include <machine/limits.h>
101 #include <machine/smp.h>
104 #include <sys/gmon.h>
107 #ifdef DEVICE_POLLING
108 extern void init_device_poll(void);
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
];
131 sysctl_cputime(SYSCTL_HANDLER_ARGS
)
134 size_t size
= sizeof(struct kinfo_cputime
);
136 for (cpu
= 0; cpu
< ncpus
; ++cpu
) {
137 if ((error
= SYSCTL_OUT(req
, &cputime_percpu
[cpu
], size
)))
143 SYSCTL_PROC(_kern
, OID_AUTO
, cputime
, (CTLTYPE_OPAQUE
|CTLFLAG_RD
), 0, 0,
144 sysctl_cputime
, "S,kinfo_cputime", "CPU time statistics");
146 SYSCTL_STRUCT(_kern
, OID_AUTO
, cputime
, CTLFLAG_RD
, &cpu_time
, kinfo_cputime
,
147 "CPU time statistics");
151 * boottime is used to calculate the 'real' uptime. Do not confuse this with
152 * microuptime(). microtime() is not drift compensated. The real uptime
153 * with compensation is nanotime() - bootime. boottime is recalculated
154 * whenever the real time is set based on the compensated elapsed time
155 * in seconds (gd->gd_time_seconds).
157 * The gd_time_seconds and gd_cpuclock_base fields remain fairly monotonic.
158 * Slight adjustments to gd_cpuclock_base are made to phase-lock it to
161 struct timespec boottime
; /* boot time (realtime) for reference only */
162 time_t time_second
; /* read-only 'passive' uptime in seconds */
165 * basetime is used to calculate the compensated real time of day. The
166 * basetime can be modified on a per-tick basis by the adjtime(),
167 * ntp_adjtime(), and sysctl-based time correction APIs.
169 * Note that frequency corrections can also be made by adjusting
172 * basetime is a tail-chasing FIFO, updated only by cpu #0. The FIFO is
173 * used on both SMP and UP systems to avoid MP races between cpu's and
174 * interrupt races on UP systems.
176 #define BASETIME_ARYSIZE 16
177 #define BASETIME_ARYMASK (BASETIME_ARYSIZE - 1)
178 static struct timespec basetime
[BASETIME_ARYSIZE
];
179 static volatile int basetime_index
;
182 sysctl_get_basetime(SYSCTL_HANDLER_ARGS
)
189 * Because basetime data and index may be updated by another cpu,
190 * a load fence is required to ensure that the data we read has
191 * not been speculatively read relative to a possibly updated index.
193 index
= basetime_index
;
195 bt
= &basetime
[index
];
196 error
= SYSCTL_OUT(req
, bt
, sizeof(*bt
));
200 SYSCTL_STRUCT(_kern
, KERN_BOOTTIME
, boottime
, CTLFLAG_RD
,
201 &boottime
, timespec
, "System boottime");
202 SYSCTL_PROC(_kern
, OID_AUTO
, basetime
, CTLTYPE_STRUCT
|CTLFLAG_RD
, 0, 0,
203 sysctl_get_basetime
, "S,timespec", "System basetime");
205 static void hardclock(systimer_t info
, struct intrframe
*frame
);
206 static void statclock(systimer_t info
, struct intrframe
*frame
);
207 static void schedclock(systimer_t info
, struct intrframe
*frame
);
208 static void getnanotime_nbt(struct timespec
*nbt
, struct timespec
*tsp
);
210 int ticks
; /* system master ticks at hz */
211 int clocks_running
; /* tsleep/timeout clocks operational */
212 int64_t nsec_adj
; /* ntpd per-tick adjustment in nsec << 32 */
213 int64_t nsec_acc
; /* accumulator */
215 /* NTPD time correction fields */
216 int64_t ntp_tick_permanent
; /* per-tick adjustment in nsec << 32 */
217 int64_t ntp_tick_acc
; /* accumulator for per-tick adjustment */
218 int64_t ntp_delta
; /* one-time correction in nsec */
219 int64_t ntp_big_delta
= 1000000000;
220 int32_t ntp_tick_delta
; /* current adjustment rate */
221 int32_t ntp_default_tick_delta
; /* adjustment rate for ntp_delta */
222 time_t ntp_leap_second
; /* time of next leap second */
223 int ntp_leap_insert
; /* whether to insert or remove a second */
226 * Finish initializing clock frequencies and start all clocks running.
230 initclocks(void *dummy
)
232 #ifdef DEVICE_POLLING
235 /*psratio = profhz / stathz;*/
241 * Called on a per-cpu basis
244 initclocks_pcpu(void)
246 struct globaldata
*gd
= mycpu
;
249 if (gd
->gd_cpuid
== 0) {
250 gd
->gd_time_seconds
= 1;
251 gd
->gd_cpuclock_base
= sys_cputimer
->count();
254 gd
->gd_time_seconds
= globaldata_find(0)->gd_time_seconds
;
255 gd
->gd_cpuclock_base
= globaldata_find(0)->gd_cpuclock_base
;
259 * Use a non-queued periodic systimer to prevent multiple ticks from
260 * building up if the sysclock jumps forward (8254 gets reset). The
261 * sysclock will never jump backwards. Our time sync is based on
262 * the actual sysclock, not the ticks count.
264 systimer_init_periodic_nq(&gd
->gd_hardclock
, hardclock
, NULL
, hz
);
265 systimer_init_periodic_nq(&gd
->gd_statclock
, statclock
, NULL
, stathz
);
266 /* XXX correct the frequency for scheduler / estcpu tests */
267 systimer_init_periodic_nq(&gd
->gd_schedclock
, schedclock
,
273 * This sets the current real time of day. Timespecs are in seconds and
274 * nanoseconds. We do not mess with gd_time_seconds and gd_cpuclock_base,
275 * instead we adjust basetime so basetime + gd_* results in the current
276 * time of day. This way the gd_* fields are guarenteed to represent
277 * a monotonically increasing 'uptime' value.
279 * When set_timeofday() is called from userland, the system call forces it
280 * onto cpu #0 since only cpu #0 can update basetime_index.
283 set_timeofday(struct timespec
*ts
)
285 struct timespec
*nbt
;
289 * XXX SMP / non-atomic basetime updates
292 ni
= (basetime_index
+ 1) & BASETIME_ARYMASK
;
295 nbt
->tv_sec
= ts
->tv_sec
- nbt
->tv_sec
;
296 nbt
->tv_nsec
= ts
->tv_nsec
- nbt
->tv_nsec
;
297 if (nbt
->tv_nsec
< 0) {
298 nbt
->tv_nsec
+= 1000000000;
303 * Note that basetime diverges from boottime as the clock drift is
304 * compensated for, so we cannot do away with boottime. When setting
305 * the absolute time of day the drift is 0 (for an instant) and we
306 * can simply assign boottime to basetime.
308 * Note that nanouptime() is based on gd_time_seconds which is drift
309 * compensated up to a point (it is guarenteed to remain monotonically
310 * increasing). gd_time_seconds is thus our best uptime guess and
311 * suitable for use in the boottime calculation. It is already taken
312 * into account in the basetime calculation above.
314 boottime
.tv_sec
= nbt
->tv_sec
;
318 * We now have a new basetime, make sure all other cpus have it,
319 * then update the index.
328 * Each cpu has its own hardclock, but we only increments ticks and softticks
331 * NOTE! systimer! the MP lock might not be held here. We can only safely
332 * manipulate objects owned by the current cpu.
335 hardclock(systimer_t info
, struct intrframe
*frame
)
339 struct globaldata
*gd
= mycpu
;
342 * Realtime updates are per-cpu. Note that timer corrections as
343 * returned by microtime() and friends make an additional adjustment
344 * using a system-wise 'basetime', but the running time is always
345 * taken from the per-cpu globaldata area. Since the same clock
346 * is distributing (XXX SMP) to all cpus, the per-cpu timebases
349 * Note that we never allow info->time (aka gd->gd_hardclock.time)
350 * to reverse index gd_cpuclock_base, but that it is possible for
351 * it to temporarily get behind in the seconds if something in the
352 * system locks interrupts for a long period of time. Since periodic
353 * timers count events, though everything should resynch again
356 cputicks
= info
->time
- gd
->gd_cpuclock_base
;
357 if (cputicks
>= sys_cputimer
->freq
) {
358 ++gd
->gd_time_seconds
;
359 gd
->gd_cpuclock_base
+= sys_cputimer
->freq
;
363 * The system-wide ticks counter and NTP related timedelta/tickdelta
364 * adjustments only occur on cpu #0. NTP adjustments are accomplished
365 * by updating basetime.
367 if (gd
->gd_cpuid
== 0) {
368 struct timespec
*nbt
;
376 if (tco
->tc_poll_pps
)
377 tco
->tc_poll_pps(tco
);
381 * Calculate the new basetime index. We are in a critical section
382 * on cpu #0 and can safely play with basetime_index. Start
383 * with the current basetime and then make adjustments.
385 ni
= (basetime_index
+ 1) & BASETIME_ARYMASK
;
387 *nbt
= basetime
[basetime_index
];
390 * Apply adjtime corrections. (adjtime() API)
392 * adjtime() only runs on cpu #0 so our critical section is
393 * sufficient to access these variables.
395 if (ntp_delta
!= 0) {
396 nbt
->tv_nsec
+= ntp_tick_delta
;
397 ntp_delta
-= ntp_tick_delta
;
398 if ((ntp_delta
> 0 && ntp_delta
< ntp_tick_delta
) ||
399 (ntp_delta
< 0 && ntp_delta
> ntp_tick_delta
)) {
400 ntp_tick_delta
= ntp_delta
;
405 * Apply permanent frequency corrections. (sysctl API)
407 if (ntp_tick_permanent
!= 0) {
408 ntp_tick_acc
+= ntp_tick_permanent
;
409 if (ntp_tick_acc
>= (1LL << 32)) {
410 nbt
->tv_nsec
+= ntp_tick_acc
>> 32;
411 ntp_tick_acc
-= (ntp_tick_acc
>> 32) << 32;
412 } else if (ntp_tick_acc
<= -(1LL << 32)) {
413 /* Negate ntp_tick_acc to avoid shifting the sign bit. */
414 nbt
->tv_nsec
-= (-ntp_tick_acc
) >> 32;
415 ntp_tick_acc
+= ((-ntp_tick_acc
) >> 32) << 32;
419 if (nbt
->tv_nsec
>= 1000000000) {
421 nbt
->tv_nsec
-= 1000000000;
422 } else if (nbt
->tv_nsec
< 0) {
424 nbt
->tv_nsec
+= 1000000000;
428 * Another per-tick compensation. (for ntp_adjtime() API)
431 nsec_acc
+= nsec_adj
;
432 if (nsec_acc
>= 0x100000000LL
) {
433 nbt
->tv_nsec
+= nsec_acc
>> 32;
434 nsec_acc
= (nsec_acc
& 0xFFFFFFFFLL
);
435 } else if (nsec_acc
<= -0x100000000LL
) {
436 nbt
->tv_nsec
-= -nsec_acc
>> 32;
437 nsec_acc
= -(-nsec_acc
& 0xFFFFFFFFLL
);
439 if (nbt
->tv_nsec
>= 1000000000) {
440 nbt
->tv_nsec
-= 1000000000;
442 } else if (nbt
->tv_nsec
< 0) {
443 nbt
->tv_nsec
+= 1000000000;
448 /************************************************************
449 * LEAP SECOND CORRECTION *
450 ************************************************************
452 * Taking into account all the corrections made above, figure
453 * out the new real time. If the seconds field has changed
454 * then apply any pending leap-second corrections.
456 getnanotime_nbt(nbt
, &nts
);
458 if (time_second
!= nts
.tv_sec
) {
460 * Apply leap second (sysctl API). Adjust nts for changes
461 * so we do not have to call getnanotime_nbt again.
463 if (ntp_leap_second
) {
464 if (ntp_leap_second
== nts
.tv_sec
) {
465 if (ntp_leap_insert
) {
477 * Apply leap second (ntp_adjtime() API), calculate a new
478 * nsec_adj field. ntp_update_second() returns nsec_adj
479 * as a per-second value but we need it as a per-tick value.
481 leap
= ntp_update_second(time_second
, &nsec_adj
);
487 * Update the time_second 'approximate time' global.
489 time_second
= nts
.tv_sec
;
493 * Finally, our new basetime is ready to go live!
499 * Figure out how badly the system is starved for memory
501 vm_fault_ratecheck();
505 * softticks are handled for all cpus
507 hardclock_softtick(gd
);
510 * ITimer handling is per-tick, per-cpu. I don't think ksignal()
511 * is mpsafe on curproc, so XXX get the mplock.
513 if ((p
= curproc
) != NULL
&& try_mplock()) {
514 if (frame
&& CLKF_USERMODE(frame
) &&
515 timevalisset(&p
->p_timer
[ITIMER_VIRTUAL
].it_value
) &&
516 itimerdecr(&p
->p_timer
[ITIMER_VIRTUAL
], tick
) == 0)
517 ksignal(p
, SIGVTALRM
);
518 if (timevalisset(&p
->p_timer
[ITIMER_PROF
].it_value
) &&
519 itimerdecr(&p
->p_timer
[ITIMER_PROF
], tick
) == 0)
527 * The statistics clock typically runs at a 125Hz rate, and is intended
528 * to be frequency offset from the hardclock (typ 100Hz). It is per-cpu.
530 * NOTE! systimer! the MP lock might not be held here. We can only safely
531 * manipulate objects owned by the current cpu.
533 * The stats clock is responsible for grabbing a profiling sample.
534 * Most of the statistics are only used by user-level statistics programs.
535 * The main exceptions are p->p_uticks, p->p_sticks, p->p_iticks, and
538 * Like the other clocks, the stat clock is called from what is effectively
539 * a fast interrupt, so the context should be the thread/process that got
543 statclock(systimer_t info
, struct intrframe
*frame
)
556 * How big was our timeslice relative to the last time?
558 microuptime(&tv
); /* mpsafe */
559 stv
= &mycpu
->gd_stattv
;
560 if (stv
->tv_sec
== 0) {
563 bump
= tv
.tv_usec
- stv
->tv_usec
+
564 (tv
.tv_sec
- stv
->tv_sec
) * 1000000;
575 if (frame
&& CLKF_USERMODE(frame
)) {
577 * Came from userland, handle user time and deal with
580 if (p
&& (p
->p_flag
& P_PROFIL
))
581 addupc_intr(p
, CLKF_PC(frame
), 1);
582 td
->td_uticks
+= bump
;
585 * Charge the time as appropriate
587 if (p
&& p
->p_nice
> NZERO
)
588 cpu_time
.cp_nice
+= bump
;
590 cpu_time
.cp_user
+= bump
;
594 * Kernel statistics are just like addupc_intr, only easier.
597 if (g
->state
== GMON_PROF_ON
&& frame
) {
598 i
= CLKF_PC(frame
) - g
->lowpc
;
599 if (i
< g
->textsize
) {
600 i
/= HISTFRACTION
* sizeof(*g
->kcount
);
606 * Came from kernel mode, so we were:
607 * - handling an interrupt,
608 * - doing syscall or trap work on behalf of the current
610 * - spinning in the idle loop.
611 * Whichever it is, charge the time as appropriate.
612 * Note that we charge interrupts to the current process,
613 * regardless of whether they are ``for'' that process,
614 * so that we know how much of its real time was spent
615 * in ``non-process'' (i.e., interrupt) work.
617 * XXX assume system if frame is NULL. A NULL frame
618 * can occur if ipi processing is done from a crit_exit().
620 if (frame
&& CLKF_INTR(frame
))
621 td
->td_iticks
+= bump
;
623 td
->td_sticks
+= bump
;
625 if (frame
&& CLKF_INTR(frame
)) {
627 do_pctrack(frame
, PCTRACK_INT
);
629 cpu_time
.cp_intr
+= bump
;
631 if (td
== &mycpu
->gd_idlethread
) {
632 cpu_time
.cp_idle
+= bump
;
636 do_pctrack(frame
, PCTRACK_SYS
);
638 cpu_time
.cp_sys
+= bump
;
646 * Sample the PC when in the kernel or in an interrupt. User code can
647 * retrieve the information and generate a histogram or other output.
651 do_pctrack(struct intrframe
*frame
, int which
)
653 struct kinfo_pctrack
*pctrack
;
655 pctrack
= &cputime_pctrack
[mycpu
->gd_cpuid
][which
];
656 pctrack
->pc_array
[pctrack
->pc_index
& PCTRACK_ARYMASK
] =
657 (void *)CLKF_PC(frame
);
662 sysctl_pctrack(SYSCTL_HANDLER_ARGS
)
664 struct kinfo_pcheader head
;
669 head
.pc_ntrack
= PCTRACK_SIZE
;
670 head
.pc_arysize
= PCTRACK_ARYSIZE
;
672 if ((error
= SYSCTL_OUT(req
, &head
, sizeof(head
))) != 0)
675 for (cpu
= 0; cpu
< ncpus
; ++cpu
) {
676 for (ntrack
= 0; ntrack
< PCTRACK_SIZE
; ++ntrack
) {
677 error
= SYSCTL_OUT(req
, &cputime_pctrack
[cpu
][ntrack
],
678 sizeof(struct kinfo_pctrack
));
687 SYSCTL_PROC(_kern
, OID_AUTO
, pctrack
, (CTLTYPE_OPAQUE
|CTLFLAG_RD
), 0, 0,
688 sysctl_pctrack
, "S,kinfo_pcheader", "CPU PC tracking");
693 * The scheduler clock typically runs at a 50Hz rate. NOTE! systimer,
694 * the MP lock might not be held. We can safely manipulate parts of curproc
695 * but that's about it.
697 * Each cpu has its own scheduler clock.
700 schedclock(systimer_t info
, struct intrframe
*frame
)
707 if ((lp
= lwkt_preempted_proc()) != NULL
) {
709 * Account for cpu time used and hit the scheduler. Note
710 * that this call MUST BE MP SAFE, and the BGL IS NOT HELD
714 lp
->lwp_proc
->p_usched
->schedulerclock(lp
, info
->periodic
,
717 if ((lp
= curthread
->td_lwp
) != NULL
) {
719 * Update resource usage integrals and maximums.
721 if ((ru
= &lp
->lwp_proc
->p_ru
) &&
722 (vm
= lp
->lwp_proc
->p_vmspace
) != NULL
) {
723 ru
->ru_ixrss
+= pgtok(vm
->vm_tsize
);
724 ru
->ru_idrss
+= pgtok(vm
->vm_dsize
);
725 ru
->ru_isrss
+= pgtok(vm
->vm_ssize
);
726 rss
= pgtok(vmspace_resident_count(vm
));
727 if (ru
->ru_maxrss
< rss
)
734 * Compute number of ticks for the specified amount of time. The
735 * return value is intended to be used in a clock interrupt timed
736 * operation and guarenteed to meet or exceed the requested time.
737 * If the representation overflows, return INT_MAX. The minimum return
738 * value is 1 ticks and the function will average the calculation up.
739 * If any value greater then 0 microseconds is supplied, a value
740 * of at least 2 will be returned to ensure that a near-term clock
741 * interrupt does not cause the timeout to occur (degenerately) early.
743 * Note that limit checks must take into account microseconds, which is
744 * done simply by using the smaller signed long maximum instead of
745 * the unsigned long maximum.
747 * If ints have 32 bits, then the maximum value for any timeout in
748 * 10ms ticks is 248 days.
751 tvtohz_high(struct timeval
*tv
)
768 kprintf("tvtohz_high: negative time difference %ld sec %ld usec\n",
772 } else if (sec
<= INT_MAX
/ hz
) {
773 ticks
= (int)(sec
* hz
+
774 ((u_long
)usec
+ (tick
- 1)) / tick
) + 1;
782 * Compute number of ticks for the specified amount of time, erroring on
783 * the side of it being too low to ensure that sleeping the returned number
784 * of ticks will not result in a late return.
786 * The supplied timeval may not be negative and should be normalized. A
787 * return value of 0 is possible if the timeval converts to less then
790 * If ints have 32 bits, then the maximum value for any timeout in
791 * 10ms ticks is 248 days.
794 tvtohz_low(struct timeval
*tv
)
800 if (sec
<= INT_MAX
/ hz
)
801 ticks
= (int)(sec
* hz
+ (u_long
)tv
->tv_usec
/ tick
);
809 * Start profiling on a process.
811 * Kernel profiling passes proc0 which never exits and hence
812 * keeps the profile clock running constantly.
815 startprofclock(struct proc
*p
)
817 if ((p
->p_flag
& P_PROFIL
) == 0) {
818 p
->p_flag
|= P_PROFIL
;
820 if (++profprocs
== 1 && stathz
!= 0) {
823 setstatclockrate(profhz
);
831 * Stop profiling on a process.
834 stopprofclock(struct proc
*p
)
836 if (p
->p_flag
& P_PROFIL
) {
837 p
->p_flag
&= ~P_PROFIL
;
839 if (--profprocs
== 0 && stathz
!= 0) {
842 setstatclockrate(stathz
);
850 * Return information about system clocks.
853 sysctl_kern_clockrate(SYSCTL_HANDLER_ARGS
)
855 struct kinfo_clockinfo clkinfo
;
857 * Construct clockinfo structure.
860 clkinfo
.ci_tick
= tick
;
861 clkinfo
.ci_tickadj
= ntp_default_tick_delta
/ 1000;
862 clkinfo
.ci_profhz
= profhz
;
863 clkinfo
.ci_stathz
= stathz
? stathz
: hz
;
864 return (sysctl_handle_opaque(oidp
, &clkinfo
, sizeof clkinfo
, req
));
867 SYSCTL_PROC(_kern
, KERN_CLOCKRATE
, clockrate
, CTLTYPE_STRUCT
|CTLFLAG_RD
,
868 0, 0, sysctl_kern_clockrate
, "S,clockinfo","");
871 * We have eight functions for looking at the clock, four for
872 * microseconds and four for nanoseconds. For each there is fast
873 * but less precise version "get{nano|micro}[up]time" which will
874 * return a time which is up to 1/HZ previous to the call, whereas
875 * the raw version "{nano|micro}[up]time" will return a timestamp
876 * which is as precise as possible. The "up" variants return the
877 * time relative to system boot, these are well suited for time
878 * interval measurements.
880 * Each cpu independantly maintains the current time of day, so all
881 * we need to do to protect ourselves from changes is to do a loop
882 * check on the seconds field changing out from under us.
884 * The system timer maintains a 32 bit count and due to various issues
885 * it is possible for the calculated delta to occassionally exceed
886 * sys_cputimer->freq. If this occurs the sys_cputimer->freq64_nsec
887 * multiplication can easily overflow, so we deal with the case. For
888 * uniformity we deal with the case in the usec case too.
891 getmicrouptime(struct timeval
*tvp
)
893 struct globaldata
*gd
= mycpu
;
897 tvp
->tv_sec
= gd
->gd_time_seconds
;
898 delta
= gd
->gd_hardclock
.time
- gd
->gd_cpuclock_base
;
899 } while (tvp
->tv_sec
!= gd
->gd_time_seconds
);
901 if (delta
>= sys_cputimer
->freq
) {
902 tvp
->tv_sec
+= delta
/ sys_cputimer
->freq
;
903 delta
%= sys_cputimer
->freq
;
905 tvp
->tv_usec
= (sys_cputimer
->freq64_usec
* delta
) >> 32;
906 if (tvp
->tv_usec
>= 1000000) {
907 tvp
->tv_usec
-= 1000000;
913 getnanouptime(struct timespec
*tsp
)
915 struct globaldata
*gd
= mycpu
;
919 tsp
->tv_sec
= gd
->gd_time_seconds
;
920 delta
= gd
->gd_hardclock
.time
- gd
->gd_cpuclock_base
;
921 } while (tsp
->tv_sec
!= gd
->gd_time_seconds
);
923 if (delta
>= sys_cputimer
->freq
) {
924 tsp
->tv_sec
+= delta
/ sys_cputimer
->freq
;
925 delta
%= sys_cputimer
->freq
;
927 tsp
->tv_nsec
= (sys_cputimer
->freq64_nsec
* delta
) >> 32;
931 microuptime(struct timeval
*tvp
)
933 struct globaldata
*gd
= mycpu
;
937 tvp
->tv_sec
= gd
->gd_time_seconds
;
938 delta
= sys_cputimer
->count() - gd
->gd_cpuclock_base
;
939 } while (tvp
->tv_sec
!= gd
->gd_time_seconds
);
941 if (delta
>= sys_cputimer
->freq
) {
942 tvp
->tv_sec
+= delta
/ sys_cputimer
->freq
;
943 delta
%= sys_cputimer
->freq
;
945 tvp
->tv_usec
= (sys_cputimer
->freq64_usec
* delta
) >> 32;
949 nanouptime(struct timespec
*tsp
)
951 struct globaldata
*gd
= mycpu
;
955 tsp
->tv_sec
= gd
->gd_time_seconds
;
956 delta
= sys_cputimer
->count() - gd
->gd_cpuclock_base
;
957 } while (tsp
->tv_sec
!= gd
->gd_time_seconds
);
959 if (delta
>= sys_cputimer
->freq
) {
960 tsp
->tv_sec
+= delta
/ sys_cputimer
->freq
;
961 delta
%= sys_cputimer
->freq
;
963 tsp
->tv_nsec
= (sys_cputimer
->freq64_nsec
* delta
) >> 32;
971 getmicrotime(struct timeval
*tvp
)
973 struct globaldata
*gd
= mycpu
;
978 tvp
->tv_sec
= gd
->gd_time_seconds
;
979 delta
= gd
->gd_hardclock
.time
- gd
->gd_cpuclock_base
;
980 } while (tvp
->tv_sec
!= gd
->gd_time_seconds
);
982 if (delta
>= sys_cputimer
->freq
) {
983 tvp
->tv_sec
+= delta
/ sys_cputimer
->freq
;
984 delta
%= sys_cputimer
->freq
;
986 tvp
->tv_usec
= (sys_cputimer
->freq64_usec
* delta
) >> 32;
988 bt
= &basetime
[basetime_index
];
989 tvp
->tv_sec
+= bt
->tv_sec
;
990 tvp
->tv_usec
+= bt
->tv_nsec
/ 1000;
991 while (tvp
->tv_usec
>= 1000000) {
992 tvp
->tv_usec
-= 1000000;
998 getnanotime(struct timespec
*tsp
)
1000 struct globaldata
*gd
= mycpu
;
1001 struct timespec
*bt
;
1005 tsp
->tv_sec
= gd
->gd_time_seconds
;
1006 delta
= gd
->gd_hardclock
.time
- gd
->gd_cpuclock_base
;
1007 } while (tsp
->tv_sec
!= gd
->gd_time_seconds
);
1009 if (delta
>= sys_cputimer
->freq
) {
1010 tsp
->tv_sec
+= delta
/ sys_cputimer
->freq
;
1011 delta
%= sys_cputimer
->freq
;
1013 tsp
->tv_nsec
= (sys_cputimer
->freq64_nsec
* delta
) >> 32;
1015 bt
= &basetime
[basetime_index
];
1016 tsp
->tv_sec
+= bt
->tv_sec
;
1017 tsp
->tv_nsec
+= bt
->tv_nsec
;
1018 while (tsp
->tv_nsec
>= 1000000000) {
1019 tsp
->tv_nsec
-= 1000000000;
1025 getnanotime_nbt(struct timespec
*nbt
, struct timespec
*tsp
)
1027 struct globaldata
*gd
= mycpu
;
1031 tsp
->tv_sec
= gd
->gd_time_seconds
;
1032 delta
= gd
->gd_hardclock
.time
- gd
->gd_cpuclock_base
;
1033 } while (tsp
->tv_sec
!= gd
->gd_time_seconds
);
1035 if (delta
>= sys_cputimer
->freq
) {
1036 tsp
->tv_sec
+= delta
/ sys_cputimer
->freq
;
1037 delta
%= sys_cputimer
->freq
;
1039 tsp
->tv_nsec
= (sys_cputimer
->freq64_nsec
* delta
) >> 32;
1041 tsp
->tv_sec
+= nbt
->tv_sec
;
1042 tsp
->tv_nsec
+= nbt
->tv_nsec
;
1043 while (tsp
->tv_nsec
>= 1000000000) {
1044 tsp
->tv_nsec
-= 1000000000;
1051 microtime(struct timeval
*tvp
)
1053 struct globaldata
*gd
= mycpu
;
1054 struct timespec
*bt
;
1058 tvp
->tv_sec
= gd
->gd_time_seconds
;
1059 delta
= sys_cputimer
->count() - gd
->gd_cpuclock_base
;
1060 } while (tvp
->tv_sec
!= gd
->gd_time_seconds
);
1062 if (delta
>= sys_cputimer
->freq
) {
1063 tvp
->tv_sec
+= delta
/ sys_cputimer
->freq
;
1064 delta
%= sys_cputimer
->freq
;
1066 tvp
->tv_usec
= (sys_cputimer
->freq64_usec
* delta
) >> 32;
1068 bt
= &basetime
[basetime_index
];
1069 tvp
->tv_sec
+= bt
->tv_sec
;
1070 tvp
->tv_usec
+= bt
->tv_nsec
/ 1000;
1071 while (tvp
->tv_usec
>= 1000000) {
1072 tvp
->tv_usec
-= 1000000;
1078 nanotime(struct timespec
*tsp
)
1080 struct globaldata
*gd
= mycpu
;
1081 struct timespec
*bt
;
1085 tsp
->tv_sec
= gd
->gd_time_seconds
;
1086 delta
= sys_cputimer
->count() - gd
->gd_cpuclock_base
;
1087 } while (tsp
->tv_sec
!= gd
->gd_time_seconds
);
1089 if (delta
>= sys_cputimer
->freq
) {
1090 tsp
->tv_sec
+= delta
/ sys_cputimer
->freq
;
1091 delta
%= sys_cputimer
->freq
;
1093 tsp
->tv_nsec
= (sys_cputimer
->freq64_nsec
* delta
) >> 32;
1095 bt
= &basetime
[basetime_index
];
1096 tsp
->tv_sec
+= bt
->tv_sec
;
1097 tsp
->tv_nsec
+= bt
->tv_nsec
;
1098 while (tsp
->tv_nsec
>= 1000000000) {
1099 tsp
->tv_nsec
-= 1000000000;
1105 * note: this is not exactly synchronized with real time. To do that we
1106 * would have to do what microtime does and check for a nanoseconds overflow.
1109 get_approximate_time_t(void)
1111 struct globaldata
*gd
= mycpu
;
1112 struct timespec
*bt
;
1114 bt
= &basetime
[basetime_index
];
1115 return(gd
->gd_time_seconds
+ bt
->tv_sec
);
1119 pps_ioctl(u_long cmd
, caddr_t data
, struct pps_state
*pps
)
1122 struct pps_fetch_args
*fapi
;
1124 struct pps_kcbind_args
*kapi
;
1128 case PPS_IOC_CREATE
:
1130 case PPS_IOC_DESTROY
:
1132 case PPS_IOC_SETPARAMS
:
1133 app
= (pps_params_t
*)data
;
1134 if (app
->mode
& ~pps
->ppscap
)
1136 pps
->ppsparam
= *app
;
1138 case PPS_IOC_GETPARAMS
:
1139 app
= (pps_params_t
*)data
;
1140 *app
= pps
->ppsparam
;
1141 app
->api_version
= PPS_API_VERS_1
;
1143 case PPS_IOC_GETCAP
:
1144 *(int*)data
= pps
->ppscap
;
1147 fapi
= (struct pps_fetch_args
*)data
;
1148 if (fapi
->tsformat
&& fapi
->tsformat
!= PPS_TSFMT_TSPEC
)
1150 if (fapi
->timeout
.tv_sec
|| fapi
->timeout
.tv_nsec
)
1151 return (EOPNOTSUPP
);
1152 pps
->ppsinfo
.current_mode
= pps
->ppsparam
.mode
;
1153 fapi
->pps_info_buf
= pps
->ppsinfo
;
1155 case PPS_IOC_KCBIND
:
1157 kapi
= (struct pps_kcbind_args
*)data
;
1158 /* XXX Only root should be able to do this */
1159 if (kapi
->tsformat
&& kapi
->tsformat
!= PPS_TSFMT_TSPEC
)
1161 if (kapi
->kernel_consumer
!= PPS_KC_HARDPPS
)
1163 if (kapi
->edge
& ~pps
->ppscap
)
1165 pps
->kcmode
= kapi
->edge
;
1168 return (EOPNOTSUPP
);
1176 pps_init(struct pps_state
*pps
)
1178 pps
->ppscap
|= PPS_TSFMT_TSPEC
;
1179 if (pps
->ppscap
& PPS_CAPTUREASSERT
)
1180 pps
->ppscap
|= PPS_OFFSETASSERT
;
1181 if (pps
->ppscap
& PPS_CAPTURECLEAR
)
1182 pps
->ppscap
|= PPS_OFFSETCLEAR
;
1186 pps_event(struct pps_state
*pps
, sysclock_t count
, int event
)
1188 struct globaldata
*gd
;
1189 struct timespec
*tsp
;
1190 struct timespec
*osp
;
1191 struct timespec
*bt
;
1204 /* Things would be easier with arrays... */
1205 if (event
== PPS_CAPTUREASSERT
) {
1206 tsp
= &pps
->ppsinfo
.assert_timestamp
;
1207 osp
= &pps
->ppsparam
.assert_offset
;
1208 foff
= pps
->ppsparam
.mode
& PPS_OFFSETASSERT
;
1209 fhard
= pps
->kcmode
& PPS_CAPTUREASSERT
;
1210 pcount
= &pps
->ppscount
[0];
1211 pseq
= &pps
->ppsinfo
.assert_sequence
;
1213 tsp
= &pps
->ppsinfo
.clear_timestamp
;
1214 osp
= &pps
->ppsparam
.clear_offset
;
1215 foff
= pps
->ppsparam
.mode
& PPS_OFFSETCLEAR
;
1216 fhard
= pps
->kcmode
& PPS_CAPTURECLEAR
;
1217 pcount
= &pps
->ppscount
[1];
1218 pseq
= &pps
->ppsinfo
.clear_sequence
;
1221 /* Nothing really happened */
1222 if (*pcount
== count
)
1228 ts
.tv_sec
= gd
->gd_time_seconds
;
1229 delta
= count
- gd
->gd_cpuclock_base
;
1230 } while (ts
.tv_sec
!= gd
->gd_time_seconds
);
1232 if (delta
>= sys_cputimer
->freq
) {
1233 ts
.tv_sec
+= delta
/ sys_cputimer
->freq
;
1234 delta
%= sys_cputimer
->freq
;
1236 ts
.tv_nsec
= (sys_cputimer
->freq64_nsec
* delta
) >> 32;
1237 bt
= &basetime
[basetime_index
];
1238 ts
.tv_sec
+= bt
->tv_sec
;
1239 ts
.tv_nsec
+= bt
->tv_nsec
;
1240 while (ts
.tv_nsec
>= 1000000000) {
1241 ts
.tv_nsec
-= 1000000000;
1249 timespecadd(tsp
, osp
);
1250 if (tsp
->tv_nsec
< 0) {
1251 tsp
->tv_nsec
+= 1000000000;
1257 /* magic, at its best... */
1258 tcount
= count
- pps
->ppscount
[2];
1259 pps
->ppscount
[2] = count
;
1260 if (tcount
>= sys_cputimer
->freq
) {
1261 delta
= (1000000000 * (tcount
/ sys_cputimer
->freq
) +
1262 sys_cputimer
->freq64_nsec
*
1263 (tcount
% sys_cputimer
->freq
)) >> 32;
1265 delta
= (sys_cputimer
->freq64_nsec
* tcount
) >> 32;
1267 hardpps(tsp
, delta
);