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allocbuf: yield cpu in a loop.

This commit is contained in:
yamt 2006-01-15 09:01:02 +00:00
parent b88fc0e1b7
commit 926005485e
1 changed files with 11 additions and 2 deletions
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13
sys/kern/vfs_bio.c
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@ -1,4 +1,4 @@
/* $NetBSD: vfs_bio.c,v 1.153 2006/01/15 08:27:07 yamt Exp $ */ /* $NetBSD: vfs_bio.c,v 1.154 2006/01/15 09:01:02 yamt Exp $ */
/*- /*-
* Copyright (c) 1982, 1986, 1989, 1993 * Copyright (c) 1982, 1986, 1989, 1993
@ -81,7 +81,7 @@
#include "opt_softdep.h" #include "opt_softdep.h"
#include <sys/cdefs.h> #include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: vfs_bio.c,v 1.153 2006/01/15 08:27:07 yamt Exp $"); __KERNEL_RCSID(0, "$NetBSD: vfs_bio.c,v 1.154 2006/01/15 09:01:02 yamt Exp $");
#include <sys/param.h> #include <sys/param.h>
#include <sys/systm.h> #include <sys/systm.h>
@ -1166,6 +1166,15 @@ allocbuf(struct buf *bp, int size, int preserve)
* Need to trim overall memory usage. * Need to trim overall memory usage.
*/ */
while (buf_canrelease()) { while (buf_canrelease()) {
if (curcpu()->ci_schedstate.spc_flags &
SPCF_SHOULDYIELD) {
simple_unlock(&bqueue_slock);
splx(s);
preempt(1);
s = splbio();
simple_lock(&bqueue_slock);
}
if (buf_trim() == 0) if (buf_trim() == 0)
break; break;
} }