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Reviewed by: msmith, bde long ago

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Fix for RTPRIO scheduler to eliminate invalid context switches.

POSIX.4 headers and sysctl variables.  Nothing should change
unless POSIX4 is defined or _POSIX_VERSION is set to 199309.
This commit is contained in:
Peter Dufault 1998-03-04 10:25:55 +00:00
parent f3df61a1cd
commit 644d85f4ca
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=34029
3 changed files with 44 additions and 14 deletions
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9
sys/kern/kern_mib.c
View File

@ -37,7 +37,7 @@
* SUCH DAMAGE.
*
* @(#)kern_sysctl.c 8.4 (Berkeley) 4/14/94
* $Id: kern_mib.c,v 1.12 1997/10/19 18:45:59 davidg Exp $
* $Id: kern_mib.c,v 1.13 1997/12/25 13:14:21 gpalmer Exp $
*/
#include <sys/param.h>
@ -52,6 +52,8 @@
#include <machine/smp.h>
#endif
#include "opt_posix4.h"
SYSCTL_NODE(, 0, sysctl, CTLFLAG_RW, 0,
"Sysctl internal magic");
SYSCTL_NODE(, CTL_KERN, kern, CTLFLAG_RW, 0,
@ -71,6 +73,11 @@ SYSCTL_NODE(, CTL_MACHDEP, machdep, CTLFLAG_RW, 0,
SYSCTL_NODE(, CTL_USER, user, CTLFLAG_RW, 0,
"user-level");
#ifdef POSIX4
SYSCTL_NODE(, CTL_POSIX4, posix4, CTLFLAG_RW, 0,
"posix4, (see posix4.h)");
#endif
SYSCTL_STRING(_kern, KERN_OSRELEASE, osrelease, CTLFLAG_RD, osrelease, 0, "");
SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD, 0, BSD, "");

7
sys/kern/kern_resource.c
View File

@ -36,7 +36,7 @@
* SUCH DAMAGE.
*
* @(#)kern_resource.c 8.5 (Berkeley) 1/21/94
* $Id: kern_resource.c,v 1.31 1998/02/04 18:43:10 dg Exp $
* $Id: kern_resource.c,v 1.32 1998/02/09 06:09:24 eivind Exp $
*/
#include "opt_compat.h"
@ -266,12 +266,15 @@ rtprio(curp, uap)
* due to a CPU-bound normal process). Fix me! XXX
*/
#if 0
if (rtp.type == RTP_PRIO_REALTIME)
if (RTP_PRIO_IS_REALTIME(rtp.type))
#endif
if (rtp.type != RTP_PRIO_NORMAL)
return (EPERM);
}
switch (rtp.type) {
#ifdef RTP_PRIO_FIFO
case RTP_PRIO_FIFO:
#endif
case RTP_PRIO_REALTIME:
case RTP_PRIO_NORMAL:
case RTP_PRIO_IDLE:

42
sys/kern/kern_synch.c
View File

@ -36,7 +36,7 @@
* SUCH DAMAGE.
*
* @(#)kern_synch.c 8.9 (Berkeley) 5/19/95
* $Id: kern_synch.c,v 1.46 1998/02/06 12:13:25 eivind Exp $
* $Id: kern_synch.c,v 1.47 1998/02/25 06:04:46 bde Exp $
*/
#include "opt_ktrace.h"
@ -96,6 +96,26 @@ sysctl_kern_quantum SYSCTL_HANDLER_ARGS
SYSCTL_PROC(_kern, OID_AUTO, quantum, CTLTYPE_INT|CTLFLAG_RW,
0, sizeof quantum, sysctl_kern_quantum, "I", "");
/* maybe_resched: Decide if you need to reschedule or not
* taking the priorities and schedulers into account.
*/
static void maybe_resched(struct proc *chk)
{
struct proc *p = curproc; /* XXX */
if (p == 0 ||
((chk->p_priority < curpriority) &&
((RTP_PRIO_BASE(chk->p_rtprio.type) ==
RTP_PRIO_BASE(p->p_rtprio.type)))))
need_resched();
}
#define ROUNDROBIN_INTERVAL (hz / quantum)
int roundrobin_interval(void)
{
return ROUNDROBIN_INTERVAL;
}
/*
* Force switch among equal priority processes every 100ms.
*/
@ -104,9 +124,12 @@ static void
roundrobin(arg)
void *arg;
{
struct proc *p = curproc; /* XXX */
if (p == 0 || RTP_PRIO_NEED_RR(p->p_rtprio.type))
need_resched();
need_resched();
timeout(roundrobin, NULL, hz / quantum);
timeout(roundrobin, NULL, ROUNDROBIN_INTERVAL);
}
/*
@ -496,7 +519,7 @@ wakeup(ident)
p->p_stat = SRUN;
if (p->p_flag & P_INMEM) {
setrunqueue(p);
need_resched();
maybe_resched(p);
} else {
p->p_flag |= P_SWAPINREQ;
wakeup((caddr_t)&proc0);
@ -541,7 +564,7 @@ wakeup_one(ident)
p->p_stat = SRUN;
if (p->p_flag & P_INMEM) {
setrunqueue(p);
need_resched();
maybe_resched(p);
break;
} else {
p->p_flag |= P_SWAPINREQ;
@ -692,8 +715,8 @@ setrunnable(p)
p->p_flag |= P_SWAPINREQ;
wakeup((caddr_t)&proc0);
}
else if (p->p_priority < curpriority)
need_resched();
else
maybe_resched(p);
}
/*
@ -711,11 +734,8 @@ resetpriority(p)
newpriority = PUSER + p->p_estcpu / 4 + 2 * p->p_nice;
newpriority = min(newpriority, MAXPRI);
p->p_usrpri = newpriority;
if (newpriority < curpriority)
need_resched();
} else {
need_resched();
}
maybe_resched(p);
}
/* ARGSUSED */