4f5d8ed825
other then curproc.
448 lines
12 KiB
C
448 lines
12 KiB
C
/*-
|
|
* Copyright (c) 1982, 1986, 1991, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
* (c) UNIX System Laboratories, Inc.
|
|
* All or some portions of this file are derived from material licensed
|
|
* to the University of California by American Telephone and Telegraph
|
|
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
|
|
* the permission of UNIX System Laboratories, Inc.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)kern_clock.c 8.5 (Berkeley) 1/21/94
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include "opt_ntp.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/dkstat.h>
|
|
#include <sys/callout.h>
|
|
#include <sys/ipl.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/resourcevar.h>
|
|
#include <sys/signalvar.h>
|
|
#include <sys/timetc.h>
|
|
#include <sys/timepps.h>
|
|
#include <vm/vm.h>
|
|
#include <sys/lock.h>
|
|
#include <vm/pmap.h>
|
|
#include <vm/vm_map.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/bus.h>
|
|
#include <sys/interrupt.h>
|
|
|
|
#include <machine/cpu.h>
|
|
#include <machine/limits.h>
|
|
#include <machine/smp.h>
|
|
|
|
#ifdef GPROF
|
|
#include <sys/gmon.h>
|
|
#endif
|
|
|
|
|
|
static void initclocks __P((void *dummy));
|
|
SYSINIT(clocks, SI_SUB_CLOCKS, SI_ORDER_FIRST, initclocks, NULL)
|
|
|
|
/* Some of these don't belong here, but it's easiest to concentrate them. */
|
|
long cp_time[CPUSTATES];
|
|
|
|
SYSCTL_OPAQUE(_kern, OID_AUTO, cp_time, CTLFLAG_RD, &cp_time, sizeof(cp_time),
|
|
"LU", "CPU time statistics");
|
|
|
|
long tk_cancc;
|
|
long tk_nin;
|
|
long tk_nout;
|
|
long tk_rawcc;
|
|
|
|
/*
|
|
* Clock handling routines.
|
|
*
|
|
* This code is written to operate with two timers that run independently of
|
|
* each other.
|
|
*
|
|
* The main timer, running hz times per second, is used to trigger interval
|
|
* timers, timeouts and rescheduling as needed.
|
|
*
|
|
* The second timer handles kernel and user profiling,
|
|
* and does resource use estimation. If the second timer is programmable,
|
|
* it is randomized to avoid aliasing between the two clocks. For example,
|
|
* the randomization prevents an adversary from always giving up the cpu
|
|
* just before its quantum expires. Otherwise, it would never accumulate
|
|
* cpu ticks. The mean frequency of the second timer is stathz.
|
|
*
|
|
* If no second timer exists, stathz will be zero; in this case we drive
|
|
* profiling and statistics off the main clock. This WILL NOT be accurate;
|
|
* do not do it unless absolutely necessary.
|
|
*
|
|
* The statistics clock may (or may not) be run at a higher rate while
|
|
* profiling. This profile clock runs at profhz. We require that profhz
|
|
* be an integral multiple of stathz.
|
|
*
|
|
* If the statistics clock is running fast, it must be divided by the ratio
|
|
* profhz/stathz for statistics. (For profiling, every tick counts.)
|
|
*
|
|
* Time-of-day is maintained using a "timecounter", which may or may
|
|
* not be related to the hardware generating the above mentioned
|
|
* interrupts.
|
|
*/
|
|
|
|
int stathz;
|
|
int profhz;
|
|
static int profprocs;
|
|
int ticks;
|
|
static int psdiv, pscnt; /* prof => stat divider */
|
|
int psratio; /* ratio: prof / stat */
|
|
|
|
/*
|
|
* Initialize clock frequencies and start both clocks running.
|
|
*/
|
|
/* ARGSUSED*/
|
|
static void
|
|
initclocks(dummy)
|
|
void *dummy;
|
|
{
|
|
register int i;
|
|
|
|
/*
|
|
* Set divisors to 1 (normal case) and let the machine-specific
|
|
* code do its bit.
|
|
*/
|
|
psdiv = pscnt = 1;
|
|
cpu_initclocks();
|
|
|
|
/*
|
|
* Compute profhz/stathz, and fix profhz if needed.
|
|
*/
|
|
i = stathz ? stathz : hz;
|
|
if (profhz == 0)
|
|
profhz = i;
|
|
psratio = profhz / i;
|
|
}
|
|
|
|
/*
|
|
* The real-time timer, interrupting hz times per second.
|
|
*/
|
|
void
|
|
hardclock(frame)
|
|
register struct clockframe *frame;
|
|
{
|
|
register struct proc *p;
|
|
int need_softclock = 0;
|
|
|
|
p = curproc;
|
|
if (p != PCPU_GET(idleproc)) {
|
|
register struct pstats *pstats;
|
|
|
|
/*
|
|
* Run current process's virtual and profile time, as needed.
|
|
*/
|
|
pstats = p->p_stats;
|
|
if (CLKF_USERMODE(frame) &&
|
|
timevalisset(&pstats->p_timer[ITIMER_VIRTUAL].it_value) &&
|
|
itimerdecr(&pstats->p_timer[ITIMER_VIRTUAL], tick) == 0) {
|
|
p->p_flag |= P_ALRMPEND;
|
|
aston();
|
|
}
|
|
if (timevalisset(&pstats->p_timer[ITIMER_PROF].it_value) &&
|
|
itimerdecr(&pstats->p_timer[ITIMER_PROF], tick) == 0) {
|
|
p->p_flag |= P_PROFPEND;
|
|
aston();
|
|
}
|
|
}
|
|
|
|
#if defined(SMP) && defined(BETTER_CLOCK)
|
|
forward_hardclock(pscnt);
|
|
#endif
|
|
|
|
/*
|
|
* If no separate statistics clock is available, run it from here.
|
|
*/
|
|
if (stathz == 0)
|
|
statclock(frame);
|
|
|
|
tc_windup();
|
|
|
|
/*
|
|
* Process callouts at a very low cpu priority, so we don't keep the
|
|
* relatively high clock interrupt priority any longer than necessary.
|
|
*/
|
|
mtx_enter(&callout_lock, MTX_SPIN);
|
|
ticks++;
|
|
if (TAILQ_FIRST(&callwheel[ticks & callwheelmask]) != NULL) {
|
|
need_softclock = 1;
|
|
} else if (softticks + 1 == ticks)
|
|
++softticks;
|
|
mtx_exit(&callout_lock, MTX_SPIN);
|
|
|
|
/*
|
|
* sched_swi acquires sched_lock, so we don't want to call it with
|
|
* callout_lock held; incorrect locking order.
|
|
*/
|
|
if (need_softclock)
|
|
sched_swi(softclock_ih, SWI_NOSWITCH);
|
|
}
|
|
|
|
/*
|
|
* Compute number of ticks in the specified amount of time.
|
|
*/
|
|
int
|
|
tvtohz(tv)
|
|
struct timeval *tv;
|
|
{
|
|
register unsigned long ticks;
|
|
register long sec, usec;
|
|
|
|
/*
|
|
* If the number of usecs in the whole seconds part of the time
|
|
* difference fits in a long, then the total number of usecs will
|
|
* fit in an unsigned long. Compute the total and convert it to
|
|
* ticks, rounding up and adding 1 to allow for the current tick
|
|
* to expire. Rounding also depends on unsigned long arithmetic
|
|
* to avoid overflow.
|
|
*
|
|
* Otherwise, if the number of ticks in the whole seconds part of
|
|
* the time difference fits in a long, then convert the parts to
|
|
* 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.
|
|
*/
|
|
sec = tv->tv_sec;
|
|
usec = tv->tv_usec;
|
|
if (usec < 0) {
|
|
sec--;
|
|
usec += 1000000;
|
|
}
|
|
if (sec < 0) {
|
|
#ifdef DIAGNOSTIC
|
|
if (usec > 0) {
|
|
sec++;
|
|
usec -= 1000000;
|
|
}
|
|
printf("tvotohz: negative time difference %ld sec %ld usec\n",
|
|
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;
|
|
return ((int)ticks);
|
|
}
|
|
|
|
/*
|
|
* 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,
|
|
* 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.
|
|
*/
|
|
void
|
|
statclock(frame)
|
|
register struct clockframe *frame;
|
|
{
|
|
#ifdef GPROF
|
|
register struct gmonparam *g;
|
|
int i;
|
|
#endif
|
|
register struct proc *p;
|
|
struct pstats *pstats;
|
|
long rss;
|
|
struct rusage *ru;
|
|
struct vmspace *vm;
|
|
|
|
mtx_enter(&sched_lock, MTX_SPIN);
|
|
|
|
if (CLKF_USERMODE(frame)) {
|
|
/*
|
|
* Came from user mode; CPU was in user state.
|
|
* If this process is being profiled, record the tick.
|
|
*/
|
|
p = curproc;
|
|
if (p->p_flag & P_PROFIL)
|
|
addupc_intr(p, CLKF_PC(frame), 1);
|
|
#if defined(SMP) && defined(BETTER_CLOCK)
|
|
if (stathz != 0)
|
|
forward_statclock(pscnt);
|
|
#endif
|
|
if (--pscnt > 0) {
|
|
mtx_exit(&sched_lock, MTX_SPIN);
|
|
return;
|
|
}
|
|
/*
|
|
* Charge the time as appropriate.
|
|
*/
|
|
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]++;
|
|
}
|
|
}
|
|
#endif
|
|
#if defined(SMP) && defined(BETTER_CLOCK)
|
|
if (stathz != 0)
|
|
forward_statclock(pscnt);
|
|
#endif
|
|
if (--pscnt > 0) {
|
|
mtx_exit(&sched_lock, MTX_SPIN);
|
|
return;
|
|
}
|
|
/*
|
|
* 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.
|
|
*/
|
|
p = curproc;
|
|
if ((p->p_ithd != NULL) || CLKF_INTR(frame)) {
|
|
p->p_iticks++;
|
|
cp_time[CP_INTR]++;
|
|
} else {
|
|
p->p_sticks++;
|
|
if (p != PCPU_GET(idleproc))
|
|
cp_time[CP_SYS]++;
|
|
else
|
|
cp_time[CP_IDLE]++;
|
|
}
|
|
}
|
|
pscnt = psdiv;
|
|
|
|
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;
|
|
}
|
|
|
|
mtx_exit(&sched_lock, MTX_SPIN);
|
|
}
|
|
|
|
/*
|
|
* Return information about system clocks.
|
|
*/
|
|
static int
|
|
sysctl_kern_clockrate(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct clockinfo clkinfo;
|
|
/*
|
|
* Construct clockinfo structure.
|
|
*/
|
|
clkinfo.hz = hz;
|
|
clkinfo.tick = tick;
|
|
clkinfo.tickadj = tickadj;
|
|
clkinfo.profhz = profhz;
|
|
clkinfo.stathz = stathz ? stathz : hz;
|
|
return (sysctl_handle_opaque(oidp, &clkinfo, sizeof clkinfo, req));
|
|
}
|
|
|
|
SYSCTL_PROC(_kern, KERN_CLOCKRATE, clockrate, CTLTYPE_STRUCT|CTLFLAG_RD,
|
|
0, 0, sysctl_kern_clockrate, "S,clockinfo","");
|