273 lines
6.5 KiB
C
273 lines
6.5 KiB
C
/*-
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* Copyright (c) 1996, 1997
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* HD Associates, Inc. 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by HD Associates, Inc
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* 4. Neither the name of the author nor the names of any co-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 HD ASSOCIATES 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 HD ASSOCIATES 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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/* ksched: Soft real time scheduling based on "rtprio". */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_posix.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/lock.h>
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#include <sys/sysctl.h>
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#include <sys/kernel.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/posix4.h>
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#include <sys/resource.h>
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#include <sys/sched.h>
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FEATURE(kposix_priority_scheduling, "POSIX P1003.1B realtime extensions");
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/* ksched: Real-time extension to support POSIX priority scheduling. */
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struct ksched {
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struct timespec rr_interval;
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};
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int
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ksched_attach(struct ksched **p)
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{
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struct ksched *ksched;
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ksched = malloc(sizeof(*ksched), M_P31B, M_WAITOK);
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ksched->rr_interval.tv_sec = 0;
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ksched->rr_interval.tv_nsec = 1000000000L / hz * sched_rr_interval();
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*p = ksched;
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return (0);
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}
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int
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ksched_detach(struct ksched *ks)
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{
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free(ks, M_P31B);
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return (0);
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}
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/*
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* XXX About priorities
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*
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* POSIX 1003.1b requires that numerically higher priorities be of
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* higher priority. It also permits sched_setparam to be
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* implementation defined for SCHED_OTHER. I don't like
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* the notion of inverted priorites for normal processes when
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* you can use "setpriority" for that.
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*
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*/
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/* Macros to convert between the unix (lower numerically is higher priority)
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* and POSIX 1003.1b (higher numerically is higher priority)
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*/
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#define p4prio_to_rtpprio(P) (RTP_PRIO_MAX - (P))
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#define rtpprio_to_p4prio(P) (RTP_PRIO_MAX - (P))
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#define p4prio_to_tsprio(P) ((PRI_MAX_TIMESHARE - PRI_MIN_TIMESHARE) - (P))
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#define tsprio_to_p4prio(P) ((PRI_MAX_TIMESHARE - PRI_MIN_TIMESHARE) - (P))
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/* These improve readability a bit for me:
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*/
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#define P1B_PRIO_MIN rtpprio_to_p4prio(RTP_PRIO_MAX)
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#define P1B_PRIO_MAX rtpprio_to_p4prio(RTP_PRIO_MIN)
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static __inline int
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getscheduler(struct ksched *ksched, struct thread *td, int *policy)
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{
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struct rtprio rtp;
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int e;
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e = 0;
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pri_to_rtp(td, &rtp);
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switch (rtp.type) {
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case RTP_PRIO_FIFO:
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*policy = SCHED_FIFO;
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break;
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case RTP_PRIO_REALTIME:
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*policy = SCHED_RR;
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break;
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default:
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*policy = SCHED_OTHER;
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break;
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}
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return (e);
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}
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int
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ksched_setparam(struct ksched *ksched,
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struct thread *td, const struct sched_param *param)
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{
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int e, policy;
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e = getscheduler(ksched, td, &policy);
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if (e == 0)
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e = ksched_setscheduler(ksched, td, policy, param);
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return (e);
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}
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int
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ksched_getparam(struct ksched *ksched, struct thread *td,
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struct sched_param *param)
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{
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struct rtprio rtp;
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pri_to_rtp(td, &rtp);
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if (RTP_PRIO_IS_REALTIME(rtp.type))
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param->sched_priority = rtpprio_to_p4prio(rtp.prio);
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else {
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if (PRI_MIN_TIMESHARE < rtp.prio)
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/*
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* The interactive score has it to min realtime
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* so we must show max (64 most likely).
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*/
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param->sched_priority = PRI_MAX_TIMESHARE -
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PRI_MIN_TIMESHARE;
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else
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param->sched_priority = tsprio_to_p4prio(rtp.prio);
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}
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return (0);
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}
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/*
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* XXX The priority and scheduler modifications should
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* be moved into published interfaces in kern/kern_sync.
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*
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* The permissions to modify process p were checked in "p31b_proc()".
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*
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*/
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int
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ksched_setscheduler(struct ksched *ksched, struct thread *td, int policy,
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const struct sched_param *param)
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{
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struct rtprio rtp;
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int e;
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e = 0;
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switch(policy) {
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case SCHED_RR:
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case SCHED_FIFO:
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if (param->sched_priority >= P1B_PRIO_MIN &&
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param->sched_priority <= P1B_PRIO_MAX) {
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rtp.prio = p4prio_to_rtpprio(param->sched_priority);
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rtp.type = (policy == SCHED_FIFO) ? RTP_PRIO_FIFO :
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RTP_PRIO_REALTIME;
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rtp_to_pri(&rtp, td);
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} else {
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e = EPERM;
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}
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break;
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case SCHED_OTHER:
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if (param->sched_priority >= 0 && param->sched_priority <=
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(PRI_MAX_TIMESHARE - PRI_MIN_TIMESHARE)) {
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rtp.type = RTP_PRIO_NORMAL;
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rtp.prio = p4prio_to_tsprio(param->sched_priority);
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rtp_to_pri(&rtp, td);
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} else {
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e = EINVAL;
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}
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break;
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default:
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e = EINVAL;
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break;
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}
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return (e);
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}
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int
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ksched_getscheduler(struct ksched *ksched, struct thread *td, int *policy)
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{
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return (getscheduler(ksched, td, policy));
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}
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/* ksched_yield: Yield the CPU. */
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int
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ksched_yield(struct ksched *ksched)
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{
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sched_relinquish(curthread);
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return (0);
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}
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int
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ksched_get_priority_max(struct ksched *ksched, int policy, int *prio)
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{
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int e;
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e = 0;
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switch (policy) {
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case SCHED_FIFO:
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case SCHED_RR:
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*prio = P1B_PRIO_MAX;
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break;
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case SCHED_OTHER:
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*prio = PRI_MAX_TIMESHARE - PRI_MIN_TIMESHARE;
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break;
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default:
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e = EINVAL;
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break;
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}
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return (e);
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}
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int
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ksched_get_priority_min(struct ksched *ksched, int policy, int *prio)
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{
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int e;
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e = 0;
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switch (policy) {
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case SCHED_FIFO:
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case SCHED_RR:
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*prio = P1B_PRIO_MIN;
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break;
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case SCHED_OTHER:
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*prio = 0;
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break;
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default:
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e = EINVAL;
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break;
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}
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return (e);
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}
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int
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ksched_rr_get_interval(struct ksched *ksched, struct thread *td,
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struct timespec *timespec)
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{
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*timespec = ksched->rr_interval;
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return (0);
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}
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