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freebsd_amp_hwpstate
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Make the scheduler quantum a tunable parameter 

Reviewd by: John Dyson  dyson@freebsd.org
This commit is contained in:
Julian Elischer 1997-08-08 22:48:57 +00:00
parent fdfbeb33ae
commit 90405c80e1
1 changed files with 26 additions and 2 deletions
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28
sys/kern/kern_synch.c
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@ -36,7 +36,7 @@
* SUCH DAMAGE.
*
* @(#)kern_synch.c 8.9 (Berkeley) 5/19/95
* $Id: kern_synch.c,v 1.31 1997/04/26 11:46:15 peter Exp $
* $Id: kern_synch.c,v 1.32 1997/06/22 16:04:18 peter Exp $
*/
#include "opt_ktrace.h"
@ -51,6 +51,7 @@
#include <sys/resourcevar.h>
#include <sys/signalvar.h>
#include <sys/vmmeter.h>
#include <sys/sysctl.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/vm_extern.h>
@ -69,6 +70,29 @@ int lbolt; /* once a second sleep address */
extern void endtsleep __P((void *));
extern void updatepri __P((struct proc *p));
#define MAXIMUM_SCHEDULE_QUANTUM (1000000) /* arbitrary limit */
#ifndef DEFAULT_SCHEDULE_QUANTUM
#define DEFAULT_SCHEDULE_QUANTUM 10
#endif
static int quantum = DEFAULT_SCHEDULE_QUANTUM; /* default value */
static int
sysctl_kern_quantum SYSCTL_HANDLER_ARGS
{
int error;
int new_val = quantum;
new_val = quantum;
error = sysctl_handle_int(oidp, &new_val, 0, req);
if ((error == 0) && (new_val > 0) && (new_val < MAXIMUM_SCHEDULE_QUANTUM)) {
quantum = new_val;
}
return (error);
}
SYSCTL_PROC(_kern, OID_AUTO, quantum, CTLTYPE_INT|CTLFLAG_RW,
0, sizeof quantum, sysctl_kern_quantum, "I", "");
/*
* Force switch among equal priority processes every 100ms.
*/
@ -79,7 +103,7 @@ roundrobin(arg)
{
need_resched();
timeout(roundrobin, NULL, hz / 10);
timeout(roundrobin, NULL, hz / quantum);
}
/*