bdf3d8b954
idle loop. Machine-dependant code can elect to eg. take power-saving actions when this event is invoked.
109 lines
2.2 KiB
C
109 lines
2.2 KiB
C
/*-
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* Copyright (c) 2000, All rights reserved. See /usr/src/COPYRIGHT
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*
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* $FreeBSD$
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*/
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#include "opt_ktrace.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/kernel.h>
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#include <sys/ktr.h>
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#include <sys/signalvar.h>
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#include <sys/resourcevar.h>
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#include <sys/vmmeter.h>
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#include <sys/sysctl.h>
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#include <sys/unistd.h>
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#include <sys/kthread.h>
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#include <sys/queue.h>
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#include <sys/eventhandler.h>
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#include <vm/vm.h>
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#include <vm/vm_extern.h>
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#ifdef KTRACE
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#include <sys/uio.h>
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#include <sys/ktrace.h>
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#endif
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#include <machine/cpu.h>
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#include <machine/ipl.h>
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#include <machine/mutex.h>
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#include <machine/smp.h>
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#include <machine/globaldata.h>
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#include <machine/globals.h>
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#ifdef SMP_DEBUG
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#include <sys/bus.h>
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#include <i386/isa/icu.h>
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#include <i386/isa/intr_machdep.h>
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#endif
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static void idle_setup(void *dummy);
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SYSINIT(idle_setup, SI_SUB_SCHED_IDLE, SI_ORDER_FIRST, idle_setup, NULL)
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static void idle_proc(void *dummy);
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EVENTHANDLER_FAST_DEFINE(idle_event, idle_eventhandler_t);
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/*
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* setup per-cpu idle process contexts
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*/
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static void
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idle_setup(void *dummy)
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{
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struct globaldata *gd;
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int error;
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SLIST_FOREACH(gd, &cpuhead, gd_allcpu) {
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#ifdef SMP
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error = kthread_create(idle_proc, NULL, &gd->gd_idleproc,
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RFSTOPPED|RFHIGHPID, "idle: cpu%d",
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gd->gd_cpuid);
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#else
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error = kthread_create(idle_proc, NULL, &gd->gd_idleproc,
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RFSTOPPED|RFHIGHPID, "idle");
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#endif
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if (error)
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panic("idle_setup: kthread_create error %d\n", error);
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gd->gd_idleproc->p_flag |= P_NOLOAD;
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gd->gd_idleproc->p_stat = SRUN;
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}
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}
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/*
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* idle process context
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*/
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static void
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idle_proc(void *dummy)
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{
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int count;
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for (;;) {
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mtx_assert(&Giant, MA_NOTOWNED);
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count = 0;
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while (count >= 0 && procrunnable() == 0) {
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/*
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* This is a good place to put things to be done in
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* the background, including sanity checks.
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*/
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if (count++ < 0)
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CTR0(KTR_PROC, "idle_proc: timed out waiting"
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" for a process");
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/* call out to any cpu-becoming-idle events */
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EVENTHANDLER_FAST_INVOKE(idle_event, count);
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}
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mtx_enter(&sched_lock, MTX_SPIN);
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mi_switch();
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mtx_exit(&sched_lock, MTX_SPIN);
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spl0();
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}
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}
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