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| author | julian <julian@FreeBSD.org> | 1997-08-08 22:48:57 +0000 |
|---|---|---|
| committer | julian <julian@FreeBSD.org> | 1997-08-08 22:48:57 +0000 |
| commit | ac5704714e9f1277cbc7a089c96c2c407ad1cbdd (patch) | |
| tree | 52015d188b4148b61d3f154b344b59ee0150fe53 /sys/kern/kern_synch.c | |
| parent | 4ab37270237dd0983456d617b0403f12e60ccc70 (diff) | |
| download | FreeBSD-src-ac5704714e9f1277cbc7a089c96c2c407ad1cbdd.zip FreeBSD-src-ac5704714e9f1277cbc7a089c96c2c407ad1cbdd.tar.gz | |
Make the scheduler quantum a tunable parameter
Reviewd by: John Dyson dyson@freebsd.org
Diffstat (limited to 'sys/kern/kern_synch.c')
| -rw-r--r-- | sys/kern/kern_synch.c | 28 |
1 files changed, 26 insertions, 2 deletions
diff --git a/sys/kern/kern_synch.c b/sys/kern/kern_synch.c index b6d00a5..2479c6a4 100644 --- a/sys/kern/kern_synch.c +++ b/sys/kern/kern_synch.c @@ -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); } /* |
