1b9d701fee
This improvements aims for avoiding further cache-misses in scheduler specific functions which need to keep track of average thread running time and further locking in places setting for this flag. Reported by: jeff (originally), kris (currently) Reviewed by: jhb Tested by: Giuseppe Cocomazzi <sbudella at email dot it>
87 lines
2.7 KiB
C
87 lines
2.7 KiB
C
/*-
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* Copyright (C) 2000-2004 The FreeBSD Project. All rights reserved.
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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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*
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* THIS SOFTWARE IS PROVIDED BY AUTHOR 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 AUTHOR 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/kthread.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/resourcevar.h>
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#include <sys/sched.h>
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#include <sys/unistd.h>
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#ifdef SMP
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#include <sys/smp.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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/*
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* Set up per-cpu idle process contexts. The AP's shouldn't be running or
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* accessing their idle processes at this point, so don't bother with
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* locking.
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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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#ifdef SMP
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struct pcpu *pc;
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#endif
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struct proc *p;
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struct thread *td;
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int error;
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p = NULL; /* start with no idle process */
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#ifdef SMP
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SLIST_FOREACH(pc, &cpuhead, pc_allcpu) {
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#endif
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#ifdef SMP
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error = kproc_kthread_add(sched_idletd, NULL, &p, &td,
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RFSTOPPED | RFHIGHPID, 0, "idle", "idle: cpu%d", pc->pc_cpuid);
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pc->pc_idlethread = td;
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#else
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error = kproc_kthread_add(sched_idletd, NULL, &p, &td,
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RFSTOPPED | RFHIGHPID, 0, "idle", "idle");
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PCPU_SET(idlethread, td);
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#endif
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if (error)
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panic("idle_setup: kproc_create error %d\n", error);
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thread_lock(td);
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TD_SET_CAN_RUN(td);
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td->td_flags |= TDF_IDLETD | TDF_NOLOAD;
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sched_class(td, PRI_IDLE);
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sched_prio(td, PRI_MAX_IDLE);
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thread_unlock(td);
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#ifdef SMP
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}
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#endif
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}
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