1994-05-24 10:09:53 +00:00
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/*-
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* Copyright (c) 1982, 1986, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)kern_clock.c 8.5 (Berkeley) 1/21/94
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1999-08-28 01:08:13 +00:00
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* $FreeBSD$
|
1994-05-24 10:09:53 +00:00
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*/
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1999-03-11 15:09:51 +00:00
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#include "opt_ntp.h"
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1994-05-24 10:09:53 +00:00
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/dkstat.h>
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#include <sys/callout.h>
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2000-10-20 07:58:15 +00:00
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#include <sys/ipl.h>
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1994-05-24 10:09:53 +00:00
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#include <sys/kernel.h>
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2000-10-20 07:58:15 +00:00
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#include <sys/mutex.h>
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1994-05-24 10:09:53 +00:00
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#include <sys/proc.h>
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#include <sys/resourcevar.h>
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1994-10-02 17:35:40 +00:00
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#include <sys/signalvar.h>
|
2000-03-20 14:09:06 +00:00
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#include <sys/timetc.h>
|
1999-03-11 15:09:51 +00:00
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#include <sys/timepps.h>
|
1994-08-27 16:14:39 +00:00
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#include <vm/vm.h>
|
1997-02-10 02:22:35 +00:00
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#include <sys/lock.h>
|
1995-12-07 12:48:31 +00:00
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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1994-10-02 17:35:40 +00:00
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#include <sys/sysctl.h>
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2000-10-25 05:19:40 +00:00
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#include <sys/bus.h>
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#include <sys/interrupt.h>
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1994-05-24 10:09:53 +00:00
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#include <machine/cpu.h>
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1997-08-21 20:33:42 +00:00
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#include <machine/limits.h>
|
2000-03-28 18:06:49 +00:00
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#include <machine/smp.h>
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1994-05-24 10:09:53 +00:00
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#ifdef GPROF
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#include <sys/gmon.h>
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#endif
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1997-12-08 23:00:24 +00:00
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1995-12-02 17:11:20 +00:00
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static void initclocks __P((void *dummy));
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1995-08-28 09:19:25 +00:00
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SYSINIT(clocks, SI_SUB_CLOCKS, SI_ORDER_FIRST, initclocks, NULL)
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1994-08-18 22:36:09 +00:00
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/* Some of these don't belong here, but it's easiest to concentrate them. */
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1997-12-08 23:00:24 +00:00
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long cp_time[CPUSTATES];
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1994-08-18 22:36:09 +00:00
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long tk_cancc;
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long tk_nin;
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long tk_nout;
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long tk_rawcc;
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1994-05-24 10:09:53 +00:00
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/*
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* Clock handling routines.
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*
|
1998-03-16 10:19:12 +00:00
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* This code is written to operate with two timers that run independently of
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* each other.
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1994-05-24 10:09:53 +00:00
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*
|
1998-03-16 10:19:12 +00:00
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* The main timer, running hz times per second, is used to trigger interval
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* timers, timeouts and rescheduling as needed.
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1994-05-24 10:09:53 +00:00
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*
|
1998-03-16 10:19:12 +00:00
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* The second timer handles kernel and user profiling,
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* and does resource use estimation. If the second timer is programmable,
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* it is randomized to avoid aliasing between the two clocks. For example,
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* the randomization prevents an adversary from always giving up the cpu
|
1998-02-20 16:36:17 +00:00
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* just before its quantum expires. Otherwise, it would never accumulate
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* cpu ticks. The mean frequency of the second timer is stathz.
|
1998-03-16 10:19:12 +00:00
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*
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* If no second timer exists, stathz will be zero; in this case we drive
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* profiling and statistics off the main clock. This WILL NOT be accurate;
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* do not do it unless absolutely necessary.
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*
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1994-05-24 10:09:53 +00:00
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* The statistics clock may (or may not) be run at a higher rate while
|
1998-03-16 10:19:12 +00:00
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* profiling. This profile clock runs at profhz. We require that profhz
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* be an integral multiple of stathz.
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*
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* If the statistics clock is running fast, it must be divided by the ratio
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* profhz/stathz for statistics. (For profiling, every tick counts.)
|
1994-05-24 10:09:53 +00:00
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*
|
1998-02-20 16:36:17 +00:00
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* Time-of-day is maintained using a "timecounter", which may or may
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* not be related to the hardware generating the above mentioned
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* interrupts.
|
1994-05-24 10:09:53 +00:00
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*/
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int stathz;
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int profhz;
|
1996-06-23 17:40:47 +00:00
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static int profprocs;
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1994-05-24 10:09:53 +00:00
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int ticks;
|
1997-09-21 22:00:25 +00:00
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static int psdiv, pscnt; /* prof => stat divider */
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1998-02-20 16:36:17 +00:00
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int psratio; /* ratio: prof / stat */
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1994-05-24 10:09:53 +00:00
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/*
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* Initialize clock frequencies and start both clocks running.
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*/
|
1995-08-28 09:19:25 +00:00
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/* ARGSUSED*/
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static void
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1995-12-02 17:11:20 +00:00
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initclocks(dummy)
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void *dummy;
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1994-05-24 10:09:53 +00:00
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{
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register int i;
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/*
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* Set divisors to 1 (normal case) and let the machine-specific
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* code do its bit.
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*/
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psdiv = pscnt = 1;
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cpu_initclocks();
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/*
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* Compute profhz/stathz, and fix profhz if needed.
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*/
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i = stathz ? stathz : hz;
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if (profhz == 0)
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profhz = i;
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psratio = profhz / i;
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}
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/*
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* The real-time timer, interrupting hz times per second.
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*/
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void
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hardclock(frame)
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register struct clockframe *frame;
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{
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register struct proc *p;
|
2000-11-19 06:02:32 +00:00
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int need_softclock = 0;
|
1994-05-24 10:09:53 +00:00
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p = curproc;
|
2000-09-07 01:33:02 +00:00
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if (p != idleproc) {
|
1994-05-24 10:09:53 +00:00
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|
register struct pstats *pstats;
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/*
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* Run current process's virtual and profile time, as needed.
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*/
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pstats = p->p_stats;
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|
if (CLKF_USERMODE(frame) &&
|
1998-04-06 08:26:08 +00:00
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|
timevalisset(&pstats->p_timer[ITIMER_VIRTUAL].it_value) &&
|
2000-10-06 02:20:21 +00:00
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|
itimerdecr(&pstats->p_timer[ITIMER_VIRTUAL], tick) == 0) {
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|
p->p_flag |= P_ALRMPEND;
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|
|
aston();
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|
}
|
1998-04-06 08:26:08 +00:00
|
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|
if (timevalisset(&pstats->p_timer[ITIMER_PROF].it_value) &&
|
2000-10-06 02:20:21 +00:00
|
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itimerdecr(&pstats->p_timer[ITIMER_PROF], tick) == 0) {
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p->p_flag |= P_PROFPEND;
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|
aston();
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|
}
|
1994-05-24 10:09:53 +00:00
|
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|
}
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|
1997-12-08 23:00:24 +00:00
|
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|
#if defined(SMP) && defined(BETTER_CLOCK)
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forward_hardclock(pscnt);
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|
#endif
|
1998-03-16 10:19:12 +00:00
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|
1994-05-24 10:09:53 +00:00
|
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/*
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* If no separate statistics clock is available, run it from here.
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*/
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if (stathz == 0)
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statclock(frame);
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|
2000-03-20 14:09:06 +00:00
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tc_windup();
|
1998-01-14 20:48:16 +00:00
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|
1998-03-16 10:19:12 +00:00
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/*
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* Process callouts at a very low cpu priority, so we don't keep the
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* relatively high clock interrupt priority any longer than necessary.
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*/
|
2000-11-19 06:02:32 +00:00
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mtx_enter(&callout_lock, MTX_SPIN);
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ticks++;
|
1998-03-16 10:19:12 +00:00
|
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if (TAILQ_FIRST(&callwheel[ticks & callwheelmask]) != NULL) {
|
2000-11-19 06:02:32 +00:00
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|
need_softclock = 1;
|
1998-03-16 10:19:12 +00:00
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} else if (softticks + 1 == ticks)
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++softticks;
|
2000-11-19 06:02:32 +00:00
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|
mtx_exit(&callout_lock, MTX_SPIN);
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/*
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|
|
* sched_swi acquires sched_lock, so we don't want to call it with
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* callout_lock held; incorrect locking order.
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*/
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if (need_softclock)
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|
|
sched_swi(softclock_ih, SWI_NOSWITCH);
|
1997-09-21 22:00:25 +00:00
|
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}
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|
1994-05-24 10:09:53 +00:00
|
|
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/*
|
1998-03-30 09:56:58 +00:00
|
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* Compute number of ticks in the specified amount of time.
|
1994-05-24 10:09:53 +00:00
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*/
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int
|
1998-03-30 09:56:58 +00:00
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tvtohz(tv)
|
1994-05-24 10:09:53 +00:00
|
|
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struct timeval *tv;
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{
|
1994-12-12 11:58:46 +00:00
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register unsigned long ticks;
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register long sec, usec;
|
1994-05-24 10:09:53 +00:00
|
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/*
|
1994-12-12 11:58:46 +00:00
|
|
|
* If the number of usecs in the whole seconds part of the time
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|
|
* difference fits in a long, then the total number of usecs will
|
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|
|
* fit in an unsigned long. Compute the total and convert it to
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|
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* ticks, rounding up and adding 1 to allow for the current tick
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* to expire. Rounding also depends on unsigned long arithmetic
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|
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* to avoid overflow.
|
1994-05-24 10:09:53 +00:00
|
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|
*
|
1994-12-12 11:58:46 +00:00
|
|
|
* Otherwise, if the number of ticks in the whole seconds part of
|
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|
* the time difference fits in a long, then convert the parts to
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|
|
* ticks separately and add, using similar rounding methods and
|
|
|
|
* overflow avoidance. This method would work in the previous
|
|
|
|
* case but it is slightly slower and assumes that hz is integral.
|
|
|
|
*
|
|
|
|
* Otherwise, round the time difference down to the maximum
|
|
|
|
* representable value.
|
|
|
|
*
|
|
|
|
* If ints have 32 bits, then the maximum value for any timeout in
|
|
|
|
* 10ms ticks is 248 days.
|
1994-05-24 10:09:53 +00:00
|
|
|
*/
|
1998-03-30 09:56:58 +00:00
|
|
|
sec = tv->tv_sec;
|
|
|
|
usec = tv->tv_usec;
|
1994-12-12 11:58:46 +00:00
|
|
|
if (usec < 0) {
|
|
|
|
sec--;
|
|
|
|
usec += 1000000;
|
|
|
|
}
|
|
|
|
if (sec < 0) {
|
|
|
|
#ifdef DIAGNOSTIC
|
1998-03-16 10:19:12 +00:00
|
|
|
if (usec > 0) {
|
1998-02-20 16:36:17 +00:00
|
|
|
sec++;
|
|
|
|
usec -= 1000000;
|
|
|
|
}
|
1998-03-30 09:56:58 +00:00
|
|
|
printf("tvotohz: negative time difference %ld sec %ld usec\n",
|
1994-12-12 11:58:46 +00:00
|
|
|
sec, usec);
|
|
|
|
#endif
|
|
|
|
ticks = 1;
|
|
|
|
} else if (sec <= LONG_MAX / 1000000)
|
|
|
|
ticks = (sec * 1000000 + (unsigned long)usec + (tick - 1))
|
|
|
|
/ tick + 1;
|
|
|
|
else if (sec <= LONG_MAX / hz)
|
|
|
|
ticks = sec * hz
|
|
|
|
+ ((unsigned long)usec + (tick - 1)) / tick + 1;
|
|
|
|
else
|
|
|
|
ticks = LONG_MAX;
|
|
|
|
if (ticks > INT_MAX)
|
|
|
|
ticks = INT_MAX;
|
1998-10-06 23:17:44 +00:00
|
|
|
return ((int)ticks);
|
1994-05-24 10:09:53 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Start profiling on a process.
|
|
|
|
*
|
|
|
|
* Kernel profiling passes proc0 which never exits and hence
|
|
|
|
* keeps the profile clock running constantly.
|
|
|
|
*/
|
|
|
|
void
|
|
|
|
startprofclock(p)
|
|
|
|
register struct proc *p;
|
|
|
|
{
|
|
|
|
int s;
|
|
|
|
|
|
|
|
if ((p->p_flag & P_PROFIL) == 0) {
|
|
|
|
p->p_flag |= P_PROFIL;
|
|
|
|
if (++profprocs == 1 && stathz != 0) {
|
|
|
|
s = splstatclock();
|
|
|
|
psdiv = pscnt = psratio;
|
|
|
|
setstatclockrate(profhz);
|
|
|
|
splx(s);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Stop profiling on a process.
|
|
|
|
*/
|
|
|
|
void
|
|
|
|
stopprofclock(p)
|
|
|
|
register struct proc *p;
|
|
|
|
{
|
|
|
|
int s;
|
|
|
|
|
|
|
|
if (p->p_flag & P_PROFIL) {
|
|
|
|
p->p_flag &= ~P_PROFIL;
|
|
|
|
if (--profprocs == 0 && stathz != 0) {
|
|
|
|
s = splstatclock();
|
|
|
|
psdiv = pscnt = 1;
|
|
|
|
setstatclockrate(stathz);
|
|
|
|
splx(s);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Statistics clock. Grab profile sample, and if divider reaches 0,
|
1999-11-27 14:37:34 +00:00
|
|
|
* do process and kernel statistics. Most of the statistics are only
|
|
|
|
* used by user-level statistics programs. The main exceptions are
|
|
|
|
* p->p_uticks, p->p_sticks, p->p_iticks, and p->p_estcpu.
|
1994-05-24 10:09:53 +00:00
|
|
|
*/
|
|
|
|
void
|
|
|
|
statclock(frame)
|
|
|
|
register struct clockframe *frame;
|
|
|
|
{
|
|
|
|
#ifdef GPROF
|
|
|
|
register struct gmonparam *g;
|
1998-10-26 06:13:18 +00:00
|
|
|
int i;
|
1994-05-24 10:09:53 +00:00
|
|
|
#endif
|
1996-07-30 16:59:22 +00:00
|
|
|
register struct proc *p;
|
|
|
|
struct pstats *pstats;
|
|
|
|
long rss;
|
|
|
|
struct rusage *ru;
|
|
|
|
struct vmspace *vm;
|
1994-08-27 16:14:39 +00:00
|
|
|
|
2000-10-06 02:20:21 +00:00
|
|
|
mtx_enter(&sched_lock, MTX_SPIN);
|
|
|
|
|
2000-09-07 01:33:02 +00:00
|
|
|
if (CLKF_USERMODE(frame)) {
|
1999-11-27 14:37:34 +00:00
|
|
|
/*
|
|
|
|
* Came from user mode; CPU was in user state.
|
|
|
|
* If this process is being profiled, record the tick.
|
|
|
|
*/
|
2000-10-06 02:20:21 +00:00
|
|
|
p = curproc;
|
1994-05-24 10:09:53 +00:00
|
|
|
if (p->p_flag & P_PROFIL)
|
|
|
|
addupc_intr(p, CLKF_PC(frame), 1);
|
1997-12-08 23:00:24 +00:00
|
|
|
#if defined(SMP) && defined(BETTER_CLOCK)
|
|
|
|
if (stathz != 0)
|
|
|
|
forward_statclock(pscnt);
|
|
|
|
#endif
|
2000-10-06 02:20:21 +00:00
|
|
|
if (--pscnt > 0) {
|
|
|
|
mtx_exit(&sched_lock, MTX_SPIN);
|
1994-05-24 10:09:53 +00:00
|
|
|
return;
|
2000-10-06 02:20:21 +00:00
|
|
|
}
|
1994-05-24 10:09:53 +00:00
|
|
|
/*
|
1999-11-27 14:37:34 +00:00
|
|
|
* Charge the time as appropriate.
|
1994-05-24 10:09:53 +00:00
|
|
|
*/
|
|
|
|
p->p_uticks++;
|
|
|
|
if (p->p_nice > NZERO)
|
|
|
|
cp_time[CP_NICE]++;
|
|
|
|
else
|
|
|
|
cp_time[CP_USER]++;
|
|
|
|
} else {
|
|
|
|
#ifdef GPROF
|
|
|
|
/*
|
|
|
|
* Kernel statistics are just like addupc_intr, only easier.
|
|
|
|
*/
|
|
|
|
g = &_gmonparam;
|
|
|
|
if (g->state == GMON_PROF_ON) {
|
|
|
|
i = CLKF_PC(frame) - g->lowpc;
|
|
|
|
if (i < g->textsize) {
|
|
|
|
i /= HISTFRACTION * sizeof(*g->kcount);
|
|
|
|
g->kcount[i]++;
|
|
|
|
}
|
|
|
|
}
|
1997-12-08 23:00:24 +00:00
|
|
|
#endif
|
|
|
|
#if defined(SMP) && defined(BETTER_CLOCK)
|
|
|
|
if (stathz != 0)
|
|
|
|
forward_statclock(pscnt);
|
1994-05-24 10:09:53 +00:00
|
|
|
#endif
|
2000-10-06 02:20:21 +00:00
|
|
|
if (--pscnt > 0) {
|
|
|
|
mtx_exit(&sched_lock, MTX_SPIN);
|
1994-05-24 10:09:53 +00:00
|
|
|
return;
|
2000-10-06 02:20:21 +00:00
|
|
|
}
|
1994-05-24 10:09:53 +00:00
|
|
|
/*
|
|
|
|
* Came from kernel mode, so we were:
|
|
|
|
* - handling an interrupt,
|
|
|
|
* - doing syscall or trap work on behalf of the current
|
|
|
|
* user process, or
|
|
|
|
* - spinning in the idle loop.
|
|
|
|
* Whichever it is, charge the time as appropriate.
|
|
|
|
* Note that we charge interrupts to the current process,
|
|
|
|
* regardless of whether they are ``for'' that process,
|
|
|
|
* so that we know how much of its real time was spent
|
|
|
|
* in ``non-process'' (i.e., interrupt) work.
|
|
|
|
*/
|
2000-10-06 02:20:21 +00:00
|
|
|
p = curproc;
|
|
|
|
if ((p->p_ithd != NULL) || CLKF_INTR(frame)) {
|
2000-09-07 01:33:02 +00:00
|
|
|
p->p_iticks++;
|
1994-05-24 10:09:53 +00:00
|
|
|
cp_time[CP_INTR]++;
|
2000-09-07 01:33:02 +00:00
|
|
|
} else {
|
1994-05-24 10:09:53 +00:00
|
|
|
p->p_sticks++;
|
2000-09-07 01:33:02 +00:00
|
|
|
if (p != idleproc)
|
|
|
|
cp_time[CP_SYS]++;
|
|
|
|
else
|
|
|
|
cp_time[CP_IDLE]++;
|
|
|
|
}
|
1994-05-24 10:09:53 +00:00
|
|
|
}
|
|
|
|
pscnt = psdiv;
|
|
|
|
|
2000-09-12 18:57:59 +00:00
|
|
|
schedclock(p);
|
|
|
|
|
|
|
|
/* Update resource usage integrals and maximums. */
|
|
|
|
if ((pstats = p->p_stats) != NULL &&
|
|
|
|
(ru = &pstats->p_ru) != NULL &&
|
|
|
|
(vm = p->p_vmspace) != NULL) {
|
|
|
|
ru->ru_ixrss += pgtok(vm->vm_tsize);
|
|
|
|
ru->ru_idrss += pgtok(vm->vm_dsize);
|
|
|
|
ru->ru_isrss += pgtok(vm->vm_ssize);
|
|
|
|
rss = pgtok(vmspace_resident_count(vm));
|
|
|
|
if (ru->ru_maxrss < rss)
|
|
|
|
ru->ru_maxrss = rss;
|
1994-05-24 10:09:53 +00:00
|
|
|
}
|
2000-10-06 02:20:21 +00:00
|
|
|
|
|
|
|
mtx_exit(&sched_lock, MTX_SPIN);
|
1994-05-24 10:09:53 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Return information about system clocks.
|
|
|
|
*/
|
1995-11-08 08:48:36 +00:00
|
|
|
static int
|
2000-07-04 11:25:35 +00:00
|
|
|
sysctl_kern_clockrate(SYSCTL_HANDLER_ARGS)
|
1994-05-24 10:09:53 +00:00
|
|
|
{
|
|
|
|
struct clockinfo clkinfo;
|
|
|
|
/*
|
|
|
|
* Construct clockinfo structure.
|
|
|
|
*/
|
|
|
|
clkinfo.hz = hz;
|
|
|
|
clkinfo.tick = tick;
|
1997-06-24 18:21:09 +00:00
|
|
|
clkinfo.tickadj = tickadj;
|
1994-05-24 10:09:53 +00:00
|
|
|
clkinfo.profhz = profhz;
|
|
|
|
clkinfo.stathz = stathz ? stathz : hz;
|
1995-11-12 19:52:09 +00:00
|
|
|
return (sysctl_handle_opaque(oidp, &clkinfo, sizeof clkinfo, req));
|
1994-05-24 10:09:53 +00:00
|
|
|
}
|
1994-09-18 20:40:01 +00:00
|
|
|
|
1995-12-04 16:48:58 +00:00
|
|
|
SYSCTL_PROC(_kern, KERN_CLOCKRATE, clockrate, CTLTYPE_STRUCT|CTLFLAG_RD,
|
1995-12-06 13:27:39 +00:00
|
|
|
0, 0, sysctl_kern_clockrate, "S,clockinfo","");
|