Module Name: src
Committed By: ozaki-r
Date: Thu Feb 1 03:17:00 UTC 2018
Modified Files:
src/sys/kern: subr_psref.c
Log Message:
Use high priority xcall with a softint of an IPL the same as psref class's one
This mitigates undesired delay of psref_target_destroy under load such as heavy
netowrk traffic that loads softint.
To generate a diff of this commit:
cvs rdiff -u -r1.10 -r1.11 src/sys/kern/subr_psref.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/kern/subr_psref.c
diff -u src/sys/kern/subr_psref.c:1.10 src/sys/kern/subr_psref.c:1.11
--- src/sys/kern/subr_psref.c:1.10 Thu Dec 28 03:39:48 2017
+++ src/sys/kern/subr_psref.c Thu Feb 1 03:17:00 2018
@@ -1,4 +1,4 @@
-/* $NetBSD: subr_psref.c,v 1.10 2017/12/28 03:39:48 msaitoh Exp $ */
+/* $NetBSD: subr_psref.c,v 1.11 2018/02/01 03:17:00 ozaki-r Exp $ */
/*-
* Copyright (c) 2016 The NetBSD Foundation, Inc.
@@ -64,7 +64,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: subr_psref.c,v 1.10 2017/12/28 03:39:48 msaitoh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: subr_psref.c,v 1.11 2018/02/01 03:17:00 ozaki-r Exp $");
#include <sys/types.h>
#include <sys/condvar.h>
@@ -94,6 +94,7 @@ struct psref_class {
kcondvar_t prc_cv;
struct percpu *prc_percpu; /* struct psref_cpu */
ipl_cookie_t prc_iplcookie;
+ unsigned int prc_xc_flags;
};
/*
@@ -124,6 +125,7 @@ psref_class_create(const char *name, int
mutex_init(&class->prc_lock, MUTEX_DEFAULT, ipl);
cv_init(&class->prc_cv, name);
class->prc_iplcookie = makeiplcookie(ipl);
+ class->prc_xc_flags = XC_HIGHPRI_IPL(ipl);
return class;
}
@@ -434,7 +436,8 @@ psreffed_p(struct psref_target *target,
* Ask all CPUs to say whether they hold a psref to the
* target.
*/
- xc_wait(xc_broadcast(0, &psreffed_p_xc, &P, NULL));
+ xc_wait(xc_broadcast(class->prc_xc_flags, &psreffed_p_xc, &P,
+ NULL));
} else
psreffed_p_xc(&P, NULL);
