Date: Fri, 08 Aug 1997 14:35:41 -0700 From: Julian Elischer <julian@whistle.com> To: current@freebsd.org Cc: dyson@freebsd.org Subject: tunable quantum patch for review Message-ID: <33EB912D.13728473@whistle.com>
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We use this at whistle.
john Dyson said he'd like it included..
So I've cleaned it up a bit (we didn't check against a 0 value)
any objections before I add it?
julian
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Index: kern_synch.c
===================================================================
RCS file: /home/ncvs/src/sys/kern/kern_synch.c,v
retrieving revision 1.31
diff -c -r1.31 kern_synch.c
*** kern_synch.c 1997/04/26 11:46:15 1.31
--- kern_synch.c 1997/08/08 21:33:16
***************
*** 51,56 ****
--- 51,57 ----
#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>
***************
*** 69,74 ****
--- 70,98 ----
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.
*/
***************
*** 79,85 ****
{
need_resched();
! timeout(roundrobin, NULL, hz / 10);
}
/*
--- 103,109 ----
{
need_resched();
! timeout(roundrobin, NULL, hz / quantum);
}
/*
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