3fed7d239a
- runq_add_pri allows the caller to position the thread at any rqindex regardless of priority. - runq_choose_from() chooses the lowest priority thread starting from a given index. The index is updated with the rqindex of the chosen thread. This routine is used to pick the lowest priority relative to a given index. - runq_remove_idx() updates the index if the run queue that held the removed thread is now empty.
687 lines
17 KiB
C
687 lines
17 KiB
C
/*-
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* Copyright (c) 2001 Jake Burkholder <jake@FreeBSD.org>
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* 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 THE 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 THE 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 "opt_sched.h"
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#ifndef KERN_SWITCH_INCLUDE
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kdb.h>
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#include <sys/kernel.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/queue.h>
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#include <sys/sched.h>
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#else /* KERN_SWITCH_INCLUDE */
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#if defined(SMP) && (defined(__i386__) || defined(__amd64__))
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#include <sys/smp.h>
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#endif
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#if defined(SMP) && defined(SCHED_4BSD)
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#include <sys/sysctl.h>
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#endif
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/* Uncomment this to enable logging of critical_enter/exit. */
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#if 0
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#define KTR_CRITICAL KTR_SCHED
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#else
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#define KTR_CRITICAL 0
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#endif
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#ifdef FULL_PREEMPTION
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#ifndef PREEMPTION
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#error "The FULL_PREEMPTION option requires the PREEMPTION option"
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#endif
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#endif
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CTASSERT((RQB_BPW * RQB_LEN) == RQ_NQS);
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/*
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* kern.sched.preemption allows user space to determine if preemption support
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* is compiled in or not. It is not currently a boot or runtime flag that
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* can be changed.
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*/
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#ifdef PREEMPTION
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static int kern_sched_preemption = 1;
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#else
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static int kern_sched_preemption = 0;
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#endif
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SYSCTL_INT(_kern_sched, OID_AUTO, preemption, CTLFLAG_RD,
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&kern_sched_preemption, 0, "Kernel preemption enabled");
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/************************************************************************
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* Functions that manipulate runnability from a thread perspective. *
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************************************************************************/
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/*
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* Select the thread that will be run next.
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*/
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struct thread *
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choosethread(void)
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{
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struct td_sched *ts;
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struct thread *td;
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#if defined(SMP) && (defined(__i386__) || defined(__amd64__))
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if (smp_active == 0 && PCPU_GET(cpuid) != 0) {
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/* Shutting down, run idlethread on AP's */
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td = PCPU_GET(idlethread);
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ts = td->td_sched;
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CTR1(KTR_RUNQ, "choosethread: td=%p (idle)", td);
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ts->ts_flags |= TSF_DIDRUN;
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TD_SET_RUNNING(td);
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return (td);
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}
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#endif
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retry:
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ts = sched_choose();
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if (ts) {
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td = ts->ts_thread;
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CTR2(KTR_RUNQ, "choosethread: td=%p pri=%d",
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td, td->td_priority);
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} else {
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/* Simulate runq_choose() having returned the idle thread */
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td = PCPU_GET(idlethread);
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ts = td->td_sched;
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CTR1(KTR_RUNQ, "choosethread: td=%p (idle)", td);
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}
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ts->ts_flags |= TSF_DIDRUN;
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/*
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* If we are in panic, only allow system threads,
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* plus the one we are running in, to be run.
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*/
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if (panicstr && ((td->td_proc->p_flag & P_SYSTEM) == 0 &&
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(td->td_flags & TDF_INPANIC) == 0)) {
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/* note that it is no longer on the run queue */
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TD_SET_CAN_RUN(td);
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goto retry;
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}
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TD_SET_RUNNING(td);
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return (td);
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}
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#if 0
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/*
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* currently not used.. threads remove themselves from the
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* run queue by running.
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*/
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static void
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remrunqueue(struct thread *td)
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{
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mtx_assert(&sched_lock, MA_OWNED);
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KASSERT((TD_ON_RUNQ(td)), ("remrunqueue: Bad state on run queue"));
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CTR1(KTR_RUNQ, "remrunqueue: td%p", td);
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TD_SET_CAN_RUN(td);
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/* remove from sys run queue */
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sched_rem(td);
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return;
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}
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#endif
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/*
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* Change the priority of a thread that is on the run queue.
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*/
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void
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adjustrunqueue( struct thread *td, int newpri)
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{
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struct td_sched *ts;
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mtx_assert(&sched_lock, MA_OWNED);
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KASSERT((TD_ON_RUNQ(td)), ("adjustrunqueue: Bad state on run queue"));
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ts = td->td_sched;
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CTR1(KTR_RUNQ, "adjustrunqueue: td%p", td);
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/* We only care about the td_sched in the run queue. */
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td->td_priority = newpri;
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#ifndef SCHED_CORE
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if (ts->ts_rqindex != (newpri / RQ_PPQ))
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#else
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if (ts->ts_rqindex != newpri)
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#endif
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{
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sched_rem(td);
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sched_add(td, SRQ_BORING);
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}
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}
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void
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setrunqueue(struct thread *td, int flags)
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{
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CTR2(KTR_RUNQ, "setrunqueue: td:%p pid:%d",
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td, td->td_proc->p_pid);
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CTR5(KTR_SCHED, "setrunqueue: %p(%s) prio %d by %p(%s)",
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td, td->td_proc->p_comm, td->td_priority, curthread,
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curthread->td_proc->p_comm);
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mtx_assert(&sched_lock, MA_OWNED);
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KASSERT((td->td_inhibitors == 0),
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("setrunqueue: trying to run inhibited thread"));
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KASSERT((TD_CAN_RUN(td) || TD_IS_RUNNING(td)),
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("setrunqueue: bad thread state"));
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TD_SET_RUNQ(td);
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sched_add(td, flags);
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}
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/*
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* Kernel thread preemption implementation. Critical sections mark
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* regions of code in which preemptions are not allowed.
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*/
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void
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critical_enter(void)
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{
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struct thread *td;
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td = curthread;
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td->td_critnest++;
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CTR4(KTR_CRITICAL, "critical_enter by thread %p (%ld, %s) to %d", td,
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(long)td->td_proc->p_pid, td->td_proc->p_comm, td->td_critnest);
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}
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void
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critical_exit(void)
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{
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struct thread *td;
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td = curthread;
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KASSERT(td->td_critnest != 0,
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("critical_exit: td_critnest == 0"));
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#ifdef PREEMPTION
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if (td->td_critnest == 1) {
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td->td_critnest = 0;
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mtx_assert(&sched_lock, MA_NOTOWNED);
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if (td->td_owepreempt) {
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td->td_critnest = 1;
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mtx_lock_spin(&sched_lock);
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td->td_critnest--;
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mi_switch(SW_INVOL, NULL);
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mtx_unlock_spin(&sched_lock);
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}
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} else
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#endif
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td->td_critnest--;
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CTR4(KTR_CRITICAL, "critical_exit by thread %p (%ld, %s) to %d", td,
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(long)td->td_proc->p_pid, td->td_proc->p_comm, td->td_critnest);
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}
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/*
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* This function is called when a thread is about to be put on run queue
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* because it has been made runnable or its priority has been adjusted. It
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* determines if the new thread should be immediately preempted to. If so,
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* it switches to it and eventually returns true. If not, it returns false
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* so that the caller may place the thread on an appropriate run queue.
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*/
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int
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maybe_preempt(struct thread *td)
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{
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#ifdef PREEMPTION
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struct thread *ctd;
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int cpri, pri;
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#endif
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mtx_assert(&sched_lock, MA_OWNED);
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#ifdef PREEMPTION
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/*
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* The new thread should not preempt the current thread if any of the
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* following conditions are true:
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*
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* - The kernel is in the throes of crashing (panicstr).
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* - The current thread has a higher (numerically lower) or
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* equivalent priority. Note that this prevents curthread from
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* trying to preempt to itself.
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* - It is too early in the boot for context switches (cold is set).
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* - The current thread has an inhibitor set or is in the process of
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* exiting. In this case, the current thread is about to switch
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* out anyways, so there's no point in preempting. If we did,
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* the current thread would not be properly resumed as well, so
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* just avoid that whole landmine.
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* - If the new thread's priority is not a realtime priority and
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* the current thread's priority is not an idle priority and
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* FULL_PREEMPTION is disabled.
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*
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* If all of these conditions are false, but the current thread is in
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* a nested critical section, then we have to defer the preemption
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* until we exit the critical section. Otherwise, switch immediately
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* to the new thread.
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*/
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ctd = curthread;
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KASSERT ((ctd->td_sched != NULL && ctd->td_sched->ts_thread == ctd),
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("thread has no (or wrong) sched-private part."));
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KASSERT((td->td_inhibitors == 0),
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("maybe_preempt: trying to run inhibited thread"));
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pri = td->td_priority;
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cpri = ctd->td_priority;
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if (panicstr != NULL || pri >= cpri || cold /* || dumping */ ||
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TD_IS_INHIBITED(ctd) || td->td_sched->ts_state != TSS_THREAD)
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return (0);
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#ifndef FULL_PREEMPTION
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if (pri > PRI_MAX_ITHD && cpri < PRI_MIN_IDLE)
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return (0);
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#endif
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if (ctd->td_critnest > 1) {
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CTR1(KTR_PROC, "maybe_preempt: in critical section %d",
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ctd->td_critnest);
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ctd->td_owepreempt = 1;
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return (0);
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}
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/*
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* Thread is runnable but not yet put on system run queue.
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*/
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MPASS(TD_ON_RUNQ(td));
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MPASS(td->td_sched->ts_state != TSS_ONRUNQ);
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TD_SET_RUNNING(td);
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CTR3(KTR_PROC, "preempting to thread %p (pid %d, %s)\n", td,
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td->td_proc->p_pid, td->td_proc->p_comm);
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mi_switch(SW_INVOL|SW_PREEMPT, td);
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return (1);
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#else
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return (0);
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#endif
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}
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#if 0
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#ifndef PREEMPTION
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/* XXX: There should be a non-static version of this. */
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static void
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printf_caddr_t(void *data)
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{
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printf("%s", (char *)data);
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}
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static char preempt_warning[] =
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"WARNING: Kernel preemption is disabled, expect reduced performance.\n";
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SYSINIT(preempt_warning, SI_SUB_COPYRIGHT, SI_ORDER_ANY, printf_caddr_t,
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preempt_warning)
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#endif
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#endif
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/************************************************************************
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* SYSTEM RUN QUEUE manipulations and tests *
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************************************************************************/
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/*
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* Initialize a run structure.
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*/
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void
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runq_init(struct runq *rq)
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{
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int i;
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bzero(rq, sizeof *rq);
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for (i = 0; i < RQ_NQS; i++)
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TAILQ_INIT(&rq->rq_queues[i]);
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}
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/*
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* Clear the status bit of the queue corresponding to priority level pri,
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* indicating that it is empty.
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*/
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static __inline void
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runq_clrbit(struct runq *rq, int pri)
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{
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struct rqbits *rqb;
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rqb = &rq->rq_status;
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CTR4(KTR_RUNQ, "runq_clrbit: bits=%#x %#x bit=%#x word=%d",
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rqb->rqb_bits[RQB_WORD(pri)],
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rqb->rqb_bits[RQB_WORD(pri)] & ~RQB_BIT(pri),
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RQB_BIT(pri), RQB_WORD(pri));
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rqb->rqb_bits[RQB_WORD(pri)] &= ~RQB_BIT(pri);
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}
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/*
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* Find the index of the first non-empty run queue. This is done by
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* scanning the status bits, a set bit indicates a non-empty queue.
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*/
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static __inline int
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runq_findbit(struct runq *rq)
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{
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struct rqbits *rqb;
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int pri;
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int i;
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rqb = &rq->rq_status;
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for (i = 0; i < RQB_LEN; i++)
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if (rqb->rqb_bits[i]) {
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pri = RQB_FFS(rqb->rqb_bits[i]) + (i << RQB_L2BPW);
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CTR3(KTR_RUNQ, "runq_findbit: bits=%#x i=%d pri=%d",
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rqb->rqb_bits[i], i, pri);
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return (pri);
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}
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return (-1);
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}
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static __inline int
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runq_findbit_from(struct runq *rq, int start)
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{
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struct rqbits *rqb;
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int bit;
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int pri;
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int i;
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rqb = &rq->rq_status;
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bit = start & (RQB_BPW -1);
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pri = 0;
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CTR1(KTR_RUNQ, "runq_findbit_from: start %d", start);
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again:
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for (i = RQB_WORD(start); i < RQB_LEN; i++) {
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CTR3(KTR_RUNQ, "runq_findbit_from: bits %d = %#x bit = %d",
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i, rqb->rqb_bits[i], bit);
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if (rqb->rqb_bits[i]) {
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if (bit != 0) {
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for (pri = bit; pri < RQB_BPW; pri++)
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if (rqb->rqb_bits[i] & (1ul << pri))
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break;
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bit = 0;
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if (pri >= RQB_BPW)
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continue;
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} else
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pri = RQB_FFS(rqb->rqb_bits[i]);
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pri += (i << RQB_L2BPW);
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CTR3(KTR_RUNQ, "runq_findbit_from: bits=%#x i=%d pri=%d",
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rqb->rqb_bits[i], i, pri);
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return (pri);
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}
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bit = 0;
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}
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if (start != 0) {
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CTR0(KTR_RUNQ, "runq_findbit_from: restarting");
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start = 0;
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goto again;
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}
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return (-1);
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}
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/*
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* Set the status bit of the queue corresponding to priority level pri,
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* indicating that it is non-empty.
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*/
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static __inline void
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runq_setbit(struct runq *rq, int pri)
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{
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struct rqbits *rqb;
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rqb = &rq->rq_status;
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CTR4(KTR_RUNQ, "runq_setbit: bits=%#x %#x bit=%#x word=%d",
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rqb->rqb_bits[RQB_WORD(pri)],
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rqb->rqb_bits[RQB_WORD(pri)] | RQB_BIT(pri),
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RQB_BIT(pri), RQB_WORD(pri));
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rqb->rqb_bits[RQB_WORD(pri)] |= RQB_BIT(pri);
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}
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/*
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* Add the thread to the queue specified by its priority, and set the
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* corresponding status bit.
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*/
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void
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runq_add(struct runq *rq, struct td_sched *ts, int flags)
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{
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struct rqhead *rqh;
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int pri;
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pri = ts->ts_thread->td_priority / RQ_PPQ;
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ts->ts_rqindex = pri;
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runq_setbit(rq, pri);
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rqh = &rq->rq_queues[pri];
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CTR5(KTR_RUNQ, "runq_add: td=%p ts=%p pri=%d %d rqh=%p",
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ts->ts_thread, ts, ts->ts_thread->td_priority, pri, rqh);
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if (flags & SRQ_PREEMPTED) {
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TAILQ_INSERT_HEAD(rqh, ts, ts_procq);
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} else {
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TAILQ_INSERT_TAIL(rqh, ts, ts_procq);
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}
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}
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void
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runq_add_pri(struct runq *rq, struct td_sched *ts, int pri, int flags)
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{
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struct rqhead *rqh;
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KASSERT(pri < RQ_NQS, ("runq_add_pri: %d out of range", pri));
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ts->ts_rqindex = pri;
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runq_setbit(rq, pri);
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rqh = &rq->rq_queues[pri];
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CTR5(KTR_RUNQ, "runq_add_pri: td=%p ke=%p pri=%d idx=%d rqh=%p",
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ts->ts_thread, ts, ts->ts_thread->td_priority, pri, rqh);
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if (flags & SRQ_PREEMPTED) {
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TAILQ_INSERT_HEAD(rqh, ts, ts_procq);
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} else {
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TAILQ_INSERT_TAIL(rqh, ts, ts_procq);
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}
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}
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/*
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* Return true if there are runnable processes of any priority on the run
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* queue, false otherwise. Has no side effects, does not modify the run
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* queue structure.
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|
*/
|
|
int
|
|
runq_check(struct runq *rq)
|
|
{
|
|
struct rqbits *rqb;
|
|
int i;
|
|
|
|
rqb = &rq->rq_status;
|
|
for (i = 0; i < RQB_LEN; i++)
|
|
if (rqb->rqb_bits[i]) {
|
|
CTR2(KTR_RUNQ, "runq_check: bits=%#x i=%d",
|
|
rqb->rqb_bits[i], i);
|
|
return (1);
|
|
}
|
|
CTR0(KTR_RUNQ, "runq_check: empty");
|
|
|
|
return (0);
|
|
}
|
|
|
|
#if defined(SMP) && defined(SCHED_4BSD)
|
|
int runq_fuzz = 1;
|
|
SYSCTL_INT(_kern_sched, OID_AUTO, runq_fuzz, CTLFLAG_RW, &runq_fuzz, 0, "");
|
|
#endif
|
|
|
|
/*
|
|
* Find the highest priority process on the run queue.
|
|
*/
|
|
struct td_sched *
|
|
runq_choose(struct runq *rq)
|
|
{
|
|
struct rqhead *rqh;
|
|
struct td_sched *ts;
|
|
int pri;
|
|
|
|
mtx_assert(&sched_lock, MA_OWNED);
|
|
while ((pri = runq_findbit(rq)) != -1) {
|
|
rqh = &rq->rq_queues[pri];
|
|
#if defined(SMP) && defined(SCHED_4BSD)
|
|
/* fuzz == 1 is normal.. 0 or less are ignored */
|
|
if (runq_fuzz > 1) {
|
|
/*
|
|
* In the first couple of entries, check if
|
|
* there is one for our CPU as a preference.
|
|
*/
|
|
int count = runq_fuzz;
|
|
int cpu = PCPU_GET(cpuid);
|
|
struct td_sched *ts2;
|
|
ts2 = ts = TAILQ_FIRST(rqh);
|
|
|
|
while (count-- && ts2) {
|
|
if (ts->ts_thread->td_lastcpu == cpu) {
|
|
ts = ts2;
|
|
break;
|
|
}
|
|
ts2 = TAILQ_NEXT(ts2, ts_procq);
|
|
}
|
|
} else
|
|
#endif
|
|
ts = TAILQ_FIRST(rqh);
|
|
KASSERT(ts != NULL, ("runq_choose: no proc on busy queue"));
|
|
CTR3(KTR_RUNQ,
|
|
"runq_choose: pri=%d td_sched=%p rqh=%p", pri, ts, rqh);
|
|
return (ts);
|
|
}
|
|
CTR1(KTR_RUNQ, "runq_choose: idleproc pri=%d", pri);
|
|
|
|
return (NULL);
|
|
}
|
|
|
|
struct td_sched *
|
|
runq_choose_from(struct runq *rq, int *idx)
|
|
{
|
|
struct rqhead *rqh;
|
|
struct td_sched *ts;
|
|
int pri;
|
|
|
|
mtx_assert(&sched_lock, MA_OWNED);
|
|
if ((pri = runq_findbit_from(rq, *idx)) != -1) {
|
|
rqh = &rq->rq_queues[pri];
|
|
ts = TAILQ_FIRST(rqh);
|
|
KASSERT(ts != NULL, ("runq_choose: no proc on busy queue"));
|
|
CTR4(KTR_RUNQ,
|
|
"runq_choose_from: pri=%d kse=%p idx=%d rqh=%p",
|
|
pri, ts, ts->ts_rqindex, rqh);
|
|
*idx = ts->ts_rqindex;
|
|
return (ts);
|
|
}
|
|
CTR1(KTR_RUNQ, "runq_choose_from: idleproc pri=%d", pri);
|
|
|
|
return (NULL);
|
|
}
|
|
/*
|
|
* Remove the thread from the queue specified by its priority, and clear the
|
|
* corresponding status bit if the queue becomes empty.
|
|
* Caller must set ts->ts_state afterwards.
|
|
*/
|
|
void
|
|
runq_remove(struct runq *rq, struct td_sched *ts)
|
|
{
|
|
|
|
runq_remove_idx(rq, ts, NULL);
|
|
}
|
|
|
|
void
|
|
runq_remove_idx(struct runq *rq, struct td_sched *ts, int *idx)
|
|
{
|
|
struct rqhead *rqh;
|
|
int pri;
|
|
|
|
KASSERT(ts->ts_thread->td_proc->p_sflag & PS_INMEM,
|
|
("runq_remove_idx: process swapped out"));
|
|
pri = ts->ts_rqindex;
|
|
rqh = &rq->rq_queues[pri];
|
|
CTR5(KTR_RUNQ, "runq_remove_idx: td=%p, ts=%p pri=%d %d rqh=%p",
|
|
ts->ts_thread, ts, ts->ts_thread->td_priority, pri, rqh);
|
|
TAILQ_REMOVE(rqh, ts, ts_procq);
|
|
if (TAILQ_EMPTY(rqh)) {
|
|
CTR0(KTR_RUNQ, "runq_remove_idx: empty");
|
|
runq_clrbit(rq, pri);
|
|
if (idx != NULL && *idx == pri)
|
|
*idx = (pri + 1) % RQ_NQS;
|
|
}
|
|
}
|
|
|
|
/****** functions that are temporarily here ***********/
|
|
#include <vm/uma.h>
|
|
extern struct mtx kse_zombie_lock;
|
|
|
|
/*
|
|
* Allocate scheduler specific per-process resources.
|
|
* The thread and proc have already been linked in.
|
|
*
|
|
* Called from:
|
|
* proc_init() (UMA init method)
|
|
*/
|
|
void
|
|
sched_newproc(struct proc *p, struct thread *td)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* thread is being either created or recycled.
|
|
* Fix up the per-scheduler resources associated with it.
|
|
* Called from:
|
|
* sched_fork_thread()
|
|
* thread_dtor() (*may go away)
|
|
* thread_init() (*may go away)
|
|
*/
|
|
void
|
|
sched_newthread(struct thread *td)
|
|
{
|
|
struct td_sched *ts;
|
|
|
|
ts = (struct td_sched *) (td + 1);
|
|
bzero(ts, sizeof(*ts));
|
|
td->td_sched = ts;
|
|
ts->ts_thread = td;
|
|
ts->ts_state = TSS_THREAD;
|
|
}
|
|
|
|
/*
|
|
* Called from:
|
|
* thr_create()
|
|
* proc_init() (UMA) via sched_newproc()
|
|
*/
|
|
void
|
|
sched_init_concurrency(struct proc *p)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* Change the concurrency of an existing proc to N
|
|
* Called from:
|
|
* kse_create()
|
|
* kse_exit()
|
|
* thread_exit()
|
|
* thread_single()
|
|
*/
|
|
void
|
|
sched_set_concurrency(struct proc *p, int concurrency)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* Called from thread_exit() for all exiting thread
|
|
*
|
|
* Not to be confused with sched_exit_thread()
|
|
* that is only called from thread_exit() for threads exiting
|
|
* without the rest of the process exiting because it is also called from
|
|
* sched_exit() and we wouldn't want to call it twice.
|
|
* XXX This can probably be fixed.
|
|
*/
|
|
void
|
|
sched_thread_exit(struct thread *td)
|
|
{
|
|
}
|
|
|
|
#endif /* KERN_SWITCH_INCLUDE */
|