writing event timer drivers, for choosing best possible drivers by machine independent code and for operating them to supply kernel with hardclock(), statclock() and profclock() events in unified fashion on various hardware. Infrastructure provides support for both per-CPU (independent for every CPU core) and global timers in periodic and one-shot modes. MI management code at this moment uses only periodic mode, but one-shot mode use planned for later, as part of tickless kernel project. For this moment infrastructure used on i386 and amd64 architectures. Other archs are welcome to follow, while their current operation should not be affected. This patch updates existing drivers (i8254, RTC and LAPIC) for the new order, and adds event timers support into the HPET driver. These drivers have different capabilities: LAPIC - per-CPU timer, supports periodic and one-shot operation, may freeze in C3 state, calibrated on first use, so may be not exactly precise. HPET - depending on hardware can work as per-CPU or global, supports periodic and one-shot operation, usually provides several event timers. i8254 - global, limited to periodic mode, because same hardware used also as time counter. RTC - global, supports only periodic mode, set of frequencies in Hz limited by powers of 2. Depending on hardware capabilities, drivers preferred in following orders, either LAPIC, HPETs, i8254, RTC or HPETs, LAPIC, i8254, RTC. User may explicitly specify wanted timers via loader tunables or sysctls: kern.eventtimer.timer1 and kern.eventtimer.timer2. If requested driver is unavailable or unoperational, system will try to replace it. If no more timers available or "NONE" specified for second, system will operate using only one timer, multiplying it's frequency by few times and uing respective dividers to honor hz, stathz and profhz values, set during initial setup.
820 lines
20 KiB
C
820 lines
20 KiB
C
/*-
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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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* 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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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_kdb.h"
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#include "opt_device_polling.h"
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#include "opt_hwpmc_hooks.h"
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#include "opt_ntp.h"
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#include "opt_watchdog.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/callout.h>
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#include <sys/kdb.h>
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#include <sys/kernel.h>
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#include <sys/kthread.h>
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#include <sys/ktr.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/resource.h>
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#include <sys/resourcevar.h>
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#include <sys/sched.h>
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#include <sys/signalvar.h>
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#include <sys/sleepqueue.h>
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#include <sys/smp.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <sys/sysctl.h>
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#include <sys/bus.h>
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#include <sys/interrupt.h>
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#include <sys/limits.h>
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#include <sys/timetc.h>
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#ifdef GPROF
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#include <sys/gmon.h>
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#endif
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#ifdef HWPMC_HOOKS
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#include <sys/pmckern.h>
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#endif
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#ifdef DEVICE_POLLING
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extern void hardclock_device_poll(void);
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#endif /* DEVICE_POLLING */
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static void initclocks(void *dummy);
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SYSINIT(clocks, SI_SUB_CLOCKS, SI_ORDER_FIRST, initclocks, NULL);
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/* Spin-lock protecting profiling statistics. */
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static struct mtx time_lock;
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static int
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sysctl_kern_cp_time(SYSCTL_HANDLER_ARGS)
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{
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int error;
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long cp_time[CPUSTATES];
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#ifdef SCTL_MASK32
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int i;
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unsigned int cp_time32[CPUSTATES];
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#endif
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read_cpu_time(cp_time);
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#ifdef SCTL_MASK32
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if (req->flags & SCTL_MASK32) {
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if (!req->oldptr)
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return SYSCTL_OUT(req, 0, sizeof(cp_time32));
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for (i = 0; i < CPUSTATES; i++)
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cp_time32[i] = (unsigned int)cp_time[i];
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error = SYSCTL_OUT(req, cp_time32, sizeof(cp_time32));
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} else
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#endif
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{
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if (!req->oldptr)
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return SYSCTL_OUT(req, 0, sizeof(cp_time));
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error = SYSCTL_OUT(req, cp_time, sizeof(cp_time));
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}
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return error;
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}
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SYSCTL_PROC(_kern, OID_AUTO, cp_time, CTLTYPE_LONG|CTLFLAG_RD|CTLFLAG_MPSAFE,
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0,0, sysctl_kern_cp_time, "LU", "CPU time statistics");
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static long empty[CPUSTATES];
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static int
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sysctl_kern_cp_times(SYSCTL_HANDLER_ARGS)
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{
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struct pcpu *pcpu;
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int error;
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int c;
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long *cp_time;
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#ifdef SCTL_MASK32
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unsigned int cp_time32[CPUSTATES];
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int i;
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#endif
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if (!req->oldptr) {
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#ifdef SCTL_MASK32
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if (req->flags & SCTL_MASK32)
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return SYSCTL_OUT(req, 0, sizeof(cp_time32) * (mp_maxid + 1));
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else
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#endif
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return SYSCTL_OUT(req, 0, sizeof(long) * CPUSTATES * (mp_maxid + 1));
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}
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for (error = 0, c = 0; error == 0 && c <= mp_maxid; c++) {
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if (!CPU_ABSENT(c)) {
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pcpu = pcpu_find(c);
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cp_time = pcpu->pc_cp_time;
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} else {
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cp_time = empty;
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}
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#ifdef SCTL_MASK32
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if (req->flags & SCTL_MASK32) {
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for (i = 0; i < CPUSTATES; i++)
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cp_time32[i] = (unsigned int)cp_time[i];
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error = SYSCTL_OUT(req, cp_time32, sizeof(cp_time32));
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} else
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#endif
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error = SYSCTL_OUT(req, cp_time, sizeof(long) * CPUSTATES);
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}
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return error;
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}
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SYSCTL_PROC(_kern, OID_AUTO, cp_times, CTLTYPE_LONG|CTLFLAG_RD|CTLFLAG_MPSAFE,
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0,0, sysctl_kern_cp_times, "LU", "per-CPU time statistics");
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#ifdef DEADLKRES
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static const char *blessed[] = {
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"getblk",
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"so_snd_sx",
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"so_rcv_sx",
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NULL
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};
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static int slptime_threshold = 1800;
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static int blktime_threshold = 900;
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static int sleepfreq = 3;
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static void
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deadlkres(void)
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{
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struct proc *p;
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struct thread *td;
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void *wchan;
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int blkticks, i, slpticks, slptype, tryl, tticks;
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tryl = 0;
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for (;;) {
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blkticks = blktime_threshold * hz;
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slpticks = slptime_threshold * hz;
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/*
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* Avoid to sleep on the sx_lock in order to avoid a possible
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* priority inversion problem leading to starvation.
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* If the lock can't be held after 100 tries, panic.
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*/
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if (!sx_try_slock(&allproc_lock)) {
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if (tryl > 100)
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panic("%s: possible deadlock detected on allproc_lock\n",
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__func__);
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tryl++;
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pause("allproc_lock deadlkres", sleepfreq * hz);
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continue;
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}
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tryl = 0;
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FOREACH_PROC_IN_SYSTEM(p) {
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PROC_LOCK(p);
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FOREACH_THREAD_IN_PROC(p, td) {
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thread_lock(td);
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if (TD_ON_LOCK(td)) {
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/*
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* The thread should be blocked on a
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* turnstile, simply check if the
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* turnstile channel is in good state.
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*/
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MPASS(td->td_blocked != NULL);
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/* Handle ticks wrap-up. */
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if (ticks < td->td_blktick)
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continue;
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tticks = ticks - td->td_blktick;
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thread_unlock(td);
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if (tticks > blkticks) {
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/*
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* Accordingly with provided
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* thresholds, this thread is
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* stuck for too long on a
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* turnstile.
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*/
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PROC_UNLOCK(p);
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sx_sunlock(&allproc_lock);
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panic("%s: possible deadlock detected for %p, blocked for %d ticks\n",
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__func__, td, tticks);
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}
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} else if (TD_IS_SLEEPING(td)) {
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/* Handle ticks wrap-up. */
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if (ticks < td->td_blktick)
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continue;
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/*
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* Check if the thread is sleeping on a
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* lock, otherwise skip the check.
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* Drop the thread lock in order to
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* avoid a LOR with the sleepqueue
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* spinlock.
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*/
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wchan = td->td_wchan;
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tticks = ticks - td->td_slptick;
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thread_unlock(td);
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slptype = sleepq_type(wchan);
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if ((slptype == SLEEPQ_SX ||
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slptype == SLEEPQ_LK) &&
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tticks > slpticks) {
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/*
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* Accordingly with provided
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* thresholds, this thread is
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* stuck for too long on a
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* sleepqueue.
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* However, being on a
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* sleepqueue, we might still
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* check for the blessed
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* list.
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*/
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tryl = 0;
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for (i = 0; blessed[i] != NULL;
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i++) {
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if (!strcmp(blessed[i],
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td->td_wmesg)) {
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tryl = 1;
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break;
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}
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}
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if (tryl != 0) {
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tryl = 0;
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continue;
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}
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PROC_UNLOCK(p);
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sx_sunlock(&allproc_lock);
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panic("%s: possible deadlock detected for %p, blocked for %d ticks\n",
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__func__, td, tticks);
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}
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} else
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thread_unlock(td);
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}
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PROC_UNLOCK(p);
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}
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sx_sunlock(&allproc_lock);
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/* Sleep for sleepfreq seconds. */
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pause("deadlkres", sleepfreq * hz);
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}
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}
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static struct kthread_desc deadlkres_kd = {
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"deadlkres",
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deadlkres,
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(struct thread **)NULL
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};
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SYSINIT(deadlkres, SI_SUB_CLOCKS, SI_ORDER_ANY, kthread_start, &deadlkres_kd);
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SYSCTL_NODE(_debug, OID_AUTO, deadlkres, CTLFLAG_RW, 0, "Deadlock resolver");
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SYSCTL_INT(_debug_deadlkres, OID_AUTO, slptime_threshold, CTLFLAG_RW,
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&slptime_threshold, 0,
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"Number of seconds within is valid to sleep on a sleepqueue");
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SYSCTL_INT(_debug_deadlkres, OID_AUTO, blktime_threshold, CTLFLAG_RW,
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&blktime_threshold, 0,
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"Number of seconds within is valid to block on a turnstile");
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SYSCTL_INT(_debug_deadlkres, OID_AUTO, sleepfreq, CTLFLAG_RW, &sleepfreq, 0,
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"Number of seconds between any deadlock resolver thread run");
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#endif /* DEADLKRES */
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void
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read_cpu_time(long *cp_time)
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{
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struct pcpu *pc;
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int i, j;
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/* Sum up global cp_time[]. */
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bzero(cp_time, sizeof(long) * CPUSTATES);
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CPU_FOREACH(i) {
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pc = pcpu_find(i);
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for (j = 0; j < CPUSTATES; j++)
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cp_time[j] += pc->pc_cp_time[j];
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}
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}
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#ifdef SW_WATCHDOG
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#include <sys/watchdog.h>
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static int watchdog_ticks;
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static int watchdog_enabled;
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static void watchdog_fire(void);
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static void watchdog_config(void *, u_int, int *);
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#endif /* SW_WATCHDOG */
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/*
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* Clock handling routines.
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*
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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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*
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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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*
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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
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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.
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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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* The statistics clock may (or may not) be run at a higher rate while
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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.)
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*
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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.
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*/
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int stathz;
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int profhz;
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int profprocs;
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int ticks;
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int psratio;
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int timer1hz;
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int timer2hz;
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static DPCPU_DEFINE(u_int, hard_cnt);
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static DPCPU_DEFINE(u_int, stat_cnt);
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static DPCPU_DEFINE(u_int, prof_cnt);
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/*
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* Initialize clock frequencies and start both clocks running.
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*/
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/* ARGSUSED*/
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static void
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initclocks(dummy)
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void *dummy;
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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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mtx_init(&time_lock, "time lock", NULL, MTX_DEF);
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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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#ifdef SW_WATCHDOG
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EVENTHANDLER_REGISTER(watchdog_list, watchdog_config, NULL, 0);
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#endif
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}
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void
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timer1clock(int usermode, uintfptr_t pc)
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{
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u_int *cnt;
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cnt = DPCPU_PTR(hard_cnt);
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*cnt += hz;
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if (*cnt >= timer1hz) {
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*cnt -= timer1hz;
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if (*cnt >= timer1hz)
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*cnt = 0;
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if (PCPU_GET(cpuid) == 0)
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hardclock(usermode, pc);
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else
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hardclock_cpu(usermode);
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}
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if (timer2hz == 0)
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timer2clock(usermode, pc);
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}
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void
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timer2clock(int usermode, uintfptr_t pc)
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{
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u_int *cnt;
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int t2hz = timer2hz ? timer2hz : timer1hz;
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cnt = DPCPU_PTR(stat_cnt);
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*cnt += stathz;
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if (*cnt >= t2hz) {
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*cnt -= t2hz;
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if (*cnt >= t2hz)
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*cnt = 0;
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statclock(usermode);
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}
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if (profprocs == 0)
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return;
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cnt = DPCPU_PTR(prof_cnt);
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*cnt += profhz;
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if (*cnt >= t2hz) {
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*cnt -= t2hz;
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if (*cnt >= t2hz)
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*cnt = 0;
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profclock(usermode, pc);
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}
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}
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/*
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* Each time the real-time timer fires, this function is called on all CPUs.
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* Note that hardclock() calls hardclock_cpu() for the boot CPU, so only
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* the other CPUs in the system need to call this function.
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*/
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void
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hardclock_cpu(int usermode)
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{
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struct pstats *pstats;
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struct thread *td = curthread;
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struct proc *p = td->td_proc;
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int flags;
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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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flags = 0;
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if (usermode &&
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timevalisset(&pstats->p_timer[ITIMER_VIRTUAL].it_value)) {
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PROC_SLOCK(p);
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if (itimerdecr(&pstats->p_timer[ITIMER_VIRTUAL], tick) == 0)
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flags |= TDF_ALRMPEND | TDF_ASTPENDING;
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PROC_SUNLOCK(p);
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}
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if (timevalisset(&pstats->p_timer[ITIMER_PROF].it_value)) {
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PROC_SLOCK(p);
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if (itimerdecr(&pstats->p_timer[ITIMER_PROF], tick) == 0)
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flags |= TDF_PROFPEND | TDF_ASTPENDING;
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PROC_SUNLOCK(p);
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}
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thread_lock(td);
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sched_tick();
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td->td_flags |= flags;
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thread_unlock(td);
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|
|
|
#ifdef HWPMC_HOOKS
|
|
if (PMC_CPU_HAS_SAMPLES(PCPU_GET(cpuid)))
|
|
PMC_CALL_HOOK_UNLOCKED(curthread, PMC_FN_DO_SAMPLES, NULL);
|
|
#endif
|
|
callout_tick();
|
|
}
|
|
|
|
/*
|
|
* The real-time timer, interrupting hz times per second.
|
|
*/
|
|
void
|
|
hardclock(int usermode, uintfptr_t pc)
|
|
{
|
|
|
|
atomic_add_int((volatile int *)&ticks, 1);
|
|
hardclock_cpu(usermode);
|
|
tc_ticktock();
|
|
/*
|
|
* If no separate statistics clock is available, run it from here.
|
|
*
|
|
* XXX: this only works for UP
|
|
*/
|
|
if (stathz == 0) {
|
|
profclock(usermode, pc);
|
|
statclock(usermode);
|
|
}
|
|
#ifdef DEVICE_POLLING
|
|
hardclock_device_poll(); /* this is very short and quick */
|
|
#endif /* DEVICE_POLLING */
|
|
#ifdef SW_WATCHDOG
|
|
if (watchdog_enabled > 0 && --watchdog_ticks <= 0)
|
|
watchdog_fire();
|
|
#endif /* SW_WATCHDOG */
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
{
|
|
|
|
PROC_LOCK_ASSERT(p, MA_OWNED);
|
|
if (p->p_flag & P_STOPPROF)
|
|
return;
|
|
if ((p->p_flag & P_PROFIL) == 0) {
|
|
p->p_flag |= P_PROFIL;
|
|
mtx_lock(&time_lock);
|
|
if (++profprocs == 1)
|
|
cpu_startprofclock();
|
|
mtx_unlock(&time_lock);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Stop profiling on a process.
|
|
*/
|
|
void
|
|
stopprofclock(p)
|
|
register struct proc *p;
|
|
{
|
|
|
|
PROC_LOCK_ASSERT(p, MA_OWNED);
|
|
if (p->p_flag & P_PROFIL) {
|
|
if (p->p_profthreads != 0) {
|
|
p->p_flag |= P_STOPPROF;
|
|
while (p->p_profthreads != 0)
|
|
msleep(&p->p_profthreads, &p->p_mtx, PPAUSE,
|
|
"stopprof", 0);
|
|
p->p_flag &= ~P_STOPPROF;
|
|
}
|
|
if ((p->p_flag & P_PROFIL) == 0)
|
|
return;
|
|
p->p_flag &= ~P_PROFIL;
|
|
mtx_lock(&time_lock);
|
|
if (--profprocs == 0)
|
|
cpu_stopprofclock();
|
|
mtx_unlock(&time_lock);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Statistics clock. Updates rusage information and calls the scheduler
|
|
* to adjust priorities of the active thread.
|
|
*
|
|
* This should be called by all active processors.
|
|
*/
|
|
void
|
|
statclock(int usermode)
|
|
{
|
|
struct rusage *ru;
|
|
struct vmspace *vm;
|
|
struct thread *td;
|
|
struct proc *p;
|
|
long rss;
|
|
long *cp_time;
|
|
|
|
td = curthread;
|
|
p = td->td_proc;
|
|
|
|
cp_time = (long *)PCPU_PTR(cp_time);
|
|
if (usermode) {
|
|
/*
|
|
* Charge the time as appropriate.
|
|
*/
|
|
td->td_uticks++;
|
|
if (p->p_nice > NZERO)
|
|
cp_time[CP_NICE]++;
|
|
else
|
|
cp_time[CP_USER]++;
|
|
} else {
|
|
/*
|
|
* 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.
|
|
*/
|
|
if ((td->td_pflags & TDP_ITHREAD) ||
|
|
td->td_intr_nesting_level >= 2) {
|
|
td->td_iticks++;
|
|
cp_time[CP_INTR]++;
|
|
} else {
|
|
td->td_pticks++;
|
|
td->td_sticks++;
|
|
if (!TD_IS_IDLETHREAD(td))
|
|
cp_time[CP_SYS]++;
|
|
else
|
|
cp_time[CP_IDLE]++;
|
|
}
|
|
}
|
|
|
|
/* Update resource usage integrals and maximums. */
|
|
MPASS(p->p_vmspace != NULL);
|
|
vm = p->p_vmspace;
|
|
ru = &td->td_ru;
|
|
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;
|
|
KTR_POINT2(KTR_SCHED, "thread", sched_tdname(td), "statclock",
|
|
"prio:%d", td->td_priority, "stathz:%d", (stathz)?stathz:hz);
|
|
thread_lock_flags(td, MTX_QUIET);
|
|
sched_clock(td);
|
|
thread_unlock(td);
|
|
}
|
|
|
|
void
|
|
profclock(int usermode, uintfptr_t pc)
|
|
{
|
|
struct thread *td;
|
|
#ifdef GPROF
|
|
struct gmonparam *g;
|
|
uintfptr_t i;
|
|
#endif
|
|
|
|
td = curthread;
|
|
if (usermode) {
|
|
/*
|
|
* Came from user mode; CPU was in user state.
|
|
* If this process is being profiled, record the tick.
|
|
* if there is no related user location yet, don't
|
|
* bother trying to count it.
|
|
*/
|
|
if (td->td_proc->p_flag & P_PROFIL)
|
|
addupc_intr(td, pc, 1);
|
|
}
|
|
#ifdef GPROF
|
|
else {
|
|
/*
|
|
* Kernel statistics are just like addupc_intr, only easier.
|
|
*/
|
|
g = &_gmonparam;
|
|
if (g->state == GMON_PROF_ON && pc >= g->lowpc) {
|
|
i = PC_TO_I(g, pc);
|
|
if (i < g->textsize) {
|
|
KCOUNT(g, i)++;
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Return information about system clocks.
|
|
*/
|
|
static int
|
|
sysctl_kern_clockrate(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct clockinfo clkinfo;
|
|
/*
|
|
* Construct clockinfo structure.
|
|
*/
|
|
bzero(&clkinfo, sizeof(clkinfo));
|
|
clkinfo.hz = hz;
|
|
clkinfo.tick = tick;
|
|
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|CTLFLAG_MPSAFE,
|
|
0, 0, sysctl_kern_clockrate, "S,clockinfo",
|
|
"Rate and period of various kernel clocks");
|
|
|
|
#ifdef SW_WATCHDOG
|
|
|
|
static void
|
|
watchdog_config(void *unused __unused, u_int cmd, int *error)
|
|
{
|
|
u_int u;
|
|
|
|
u = cmd & WD_INTERVAL;
|
|
if (u >= WD_TO_1SEC) {
|
|
watchdog_ticks = (1 << (u - WD_TO_1SEC)) * hz;
|
|
watchdog_enabled = 1;
|
|
*error = 0;
|
|
} else {
|
|
watchdog_enabled = 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Handle a watchdog timeout by dumping interrupt information and
|
|
* then either dropping to DDB or panicking.
|
|
*/
|
|
static void
|
|
watchdog_fire(void)
|
|
{
|
|
int nintr;
|
|
u_int64_t inttotal;
|
|
u_long *curintr;
|
|
char *curname;
|
|
|
|
curintr = intrcnt;
|
|
curname = intrnames;
|
|
inttotal = 0;
|
|
nintr = eintrcnt - intrcnt;
|
|
|
|
printf("interrupt total\n");
|
|
while (--nintr >= 0) {
|
|
if (*curintr)
|
|
printf("%-12s %20lu\n", curname, *curintr);
|
|
curname += strlen(curname) + 1;
|
|
inttotal += *curintr++;
|
|
}
|
|
printf("Total %20ju\n", (uintmax_t)inttotal);
|
|
|
|
#if defined(KDB) && !defined(KDB_UNATTENDED)
|
|
kdb_backtrace();
|
|
kdb_enter(KDB_WHY_WATCHDOG, "watchdog timeout");
|
|
#else
|
|
panic("watchdog timeout");
|
|
#endif
|
|
}
|
|
|
|
#endif /* SW_WATCHDOG */
|