Create sysctl kern.fast_vfork, on for uniprocessor by default, off for
SMP.
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c32ba2484e
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c76e95c3c7
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=25169
@ -36,7 +36,7 @@
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* SUCH DAMAGE.
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*
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* @(#)kern_fork.c 8.6 (Berkeley) 4/8/94
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* $Id: kern_fork.c,v 1.39 1997/04/23 22:13:18 ache Exp $
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* $Id: kern_fork.c,v 1.40 1997/04/26 14:31:36 peter Exp $
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*/
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#include "opt_ktrace.h"
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@ -47,6 +47,7 @@
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#include <sys/sysproto.h>
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#include <sys/filedesc.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.h>
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#include <sys/malloc.h>
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#include <sys/proc.h>
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#include <sys/resourcevar.h>
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@ -63,6 +64,13 @@
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#include <vm/vm_extern.h>
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#include <vm/vm_inherit.h>
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#ifdef SMP
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int fast_vfork = 0; /* Doesn't work on SMP yet */
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#else
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int fast_vfork = 1;
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#endif
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SYSCTL_INT(_kern, OID_AUTO, fast_vfork, CTLFLAG_RW, &fast_vfork, 0, "");
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static int fork1 __P((struct proc *p, int flags, int *retval));
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/*
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@ -99,11 +107,8 @@ vfork(p, uap, retval)
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struct vfork_args *uap;
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int retval[];
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{
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return (fork1(p, (RFFDG|RFPROC|RFPPWAIT
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#ifndef SMP
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|RFMEM /* does not work yet on SMP */
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#endif
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), retval));
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return (fork1(p, (RFFDG|RFPROC|RFPPWAIT|(fast_vfork ? RFMEM : 0)),
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retval));
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}
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/* ARGSUSED */
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