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Create sysctl kern.fast_vfork, on for uniprocessor by default, off for

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SMP.
This commit is contained in:
peter 1997-04-26 15:59:50 +00:00
parent 2db802b49a
commit 37a61dfff7
1 changed files with 11 additions and 6 deletions
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17
sys/kern/kern_fork.c
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@ -36,7 +36,7 @@
* SUCH DAMAGE.
*
* @(#)kern_fork.c 8.6 (Berkeley) 4/8/94
* $Id: kern_fork.c,v 1.39 1997/04/23 22:13:18 ache Exp $
* $Id: kern_fork.c,v 1.40 1997/04/26 14:31:36 peter Exp $
*/
#include "opt_ktrace.h"
@ -47,6 +47,7 @@
#include <sys/sysproto.h>
#include <sys/filedesc.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <sys/resourcevar.h>
@ -63,6 +64,13 @@
#include <vm/vm_extern.h>
#include <vm/vm_inherit.h>
#ifdef SMP
int fast_vfork = 0; /* Doesn't work on SMP yet */
#else
int fast_vfork = 1;
#endif
SYSCTL_INT(_kern, OID_AUTO, fast_vfork, CTLFLAG_RW, &fast_vfork, 0, "");
static int fork1 __P((struct proc *p, int flags, int *retval));
/*
@ -99,11 +107,8 @@ vfork(p, uap, retval)
struct vfork_args *uap;
int retval[];
{
return (fork1(p, (RFFDG|RFPROC|RFPPWAIT
#ifndef SMP
|RFMEM /* does not work yet on SMP */
#endif
), retval));
return (fork1(p, (RFFDG|RFPROC|RFPPWAIT|(fast_vfork ? RFMEM : 0)),
retval));
}
/* ARGSUSED */