474b917526
setrunqueue() was mostly empty. The few asserts and thread state
setting were moved to the individual schedulers. sched_add() was
chosen to displace it for naming consistency reasons.
- Remove adjustrunqueue, it was 4 lines of code that was ifdef'd to be
different on all three schedulers where it was only called in one place
each.
- Remove the long ifdef'd out remrunqueue code.
- Remove the now redundant ts_state. Inspect the thread state directly.
- Don't set TSF_* flags from kern_switch.c, we were only doing this to
support a feature in one scheduler.
- Change sched_choose() to return a thread rather than a td_sched. Also,
rely on the schedulers to return the idlethread. This simplifies the
logic in choosethread(). Aside from the run queue links kern_switch.c
mostly does not care about the contents of td_sched.
Discussed with: julian
- Move the idle thread loop into the per scheduler area. ULE wants to
do something different from the other schedulers.
Suggested by: jhb
Tested on: x86/amd64 sched_{4BSD, ULE, CORE}.
88 lines
2.7 KiB
C
88 lines
2.7 KiB
C
/*-
|
|
* Copyright (C) 2000-2004 The FreeBSD Project. All rights reserved.
|
|
*
|
|
* 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY AUTHOR 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 AUTHOR 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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/kthread.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/resourcevar.h>
|
|
#include <sys/sched.h>
|
|
#include <sys/unistd.h>
|
|
#ifdef SMP
|
|
#include <sys/smp.h>
|
|
#endif
|
|
|
|
static void idle_setup(void *dummy);
|
|
SYSINIT(idle_setup, SI_SUB_SCHED_IDLE, SI_ORDER_FIRST, idle_setup, NULL)
|
|
|
|
/*
|
|
* Set up per-cpu idle process contexts. The AP's shouldn't be running or
|
|
* accessing their idle processes at this point, so don't bother with
|
|
* locking.
|
|
*/
|
|
static void
|
|
idle_setup(void *dummy)
|
|
{
|
|
#ifdef SMP
|
|
struct pcpu *pc;
|
|
#endif
|
|
struct proc *p;
|
|
struct thread *td;
|
|
int error;
|
|
|
|
#ifdef SMP
|
|
SLIST_FOREACH(pc, &cpuhead, pc_allcpu) {
|
|
error = kthread_create(sched_idletd, NULL, &p,
|
|
RFSTOPPED | RFHIGHPID, 0, "idle: cpu%d", pc->pc_cpuid);
|
|
pc->pc_idlethread = FIRST_THREAD_IN_PROC(p);
|
|
#else
|
|
error = kthread_create(sched_idletd, NULL, &p,
|
|
RFSTOPPED | RFHIGHPID, 0, "idle");
|
|
PCPU_SET(idlethread, FIRST_THREAD_IN_PROC(p));
|
|
#endif
|
|
if (error)
|
|
panic("idle_setup: kthread_create error %d\n", error);
|
|
|
|
PROC_LOCK(p);
|
|
p->p_flag |= P_NOLOAD;
|
|
mtx_lock_spin(&sched_lock);
|
|
td = FIRST_THREAD_IN_PROC(p);
|
|
TD_SET_CAN_RUN(td);
|
|
td->td_flags |= TDF_IDLETD;
|
|
sched_class(td, PRI_IDLE);
|
|
sched_prio(td, PRI_MAX_IDLE);
|
|
mtx_unlock_spin(&sched_lock);
|
|
PROC_UNLOCK(p);
|
|
#ifdef SMP
|
|
}
|
|
#endif
|
|
}
|