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softint_overlay: bind the stolen LWP to the current CPU while processing, 

to prevent it blocking and migrating to another CPU.
This commit is contained in:
ad 2008-04-12 17:17:28 +00:00
parent b60416c0e2
commit da60beabf5
1 changed files with 8 additions and 7 deletions
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15
sys/kern/kern_softint.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: kern_softint.c,v 1.13 2008/03/20 19:12:23 ad Exp $ */
/* $NetBSD: kern_softint.c,v 1.14 2008/04/12 17:17:28 ad Exp $ */
/*-
* Copyright (c) 2007, 2008 The NetBSD Foundation, Inc.
@ -183,7 +183,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: kern_softint.c,v 1.13 2008/03/20 19:12:23 ad Exp $");
__KERNEL_RCSID(0, "$NetBSD: kern_softint.c,v 1.14 2008/04/12 17:17:28 ad Exp $");
#include <sys/param.h>
#include <sys/malloc.h>
@ -676,7 +676,7 @@ void
softint_overlay(void)
{
struct cpu_info *ci;
u_int softints;
u_int softints, oflag;
softint_t *si;
pri_t obase;
lwp_t *l;
@ -689,10 +689,11 @@ softint_overlay(void)
KASSERT((l->l_pflag & LP_INTR) == 0);
/* Arrange to elevate priority if the LWP blocks. */
s = splhigh();
obase = l->l_kpribase;
l->l_kpribase = PRI_KERNEL_RT;
l->l_pflag |= LP_INTR;
s = splhigh();
oflag = l->l_pflag;
l->l_pflag = oflag | LP_INTR | LP_BOUND;
while ((softints = ci->ci_data.cpu_softints) != 0) {
if ((softints & (1 << SOFTINT_SERIAL)) != 0) {
ci->ci_data.cpu_softints &= ~(1 << SOFTINT_SERIAL);
@ -715,9 +716,9 @@ softint_overlay(void)
continue;
}
}
splx(s);
l->l_pflag &= ~LP_INTR;
l->l_pflag = opflag;
l->l_kpribase = obase;
splx(s);
}
#else /* !__HAVE_FAST_SOFTINTS */