[src/trunk]: src/sys Avoid thundering herd: cv_broadcast(&bp->b_busy) -> cv_s...

[ad <ad%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/1b263e03d3fe
branches:  trunk
changeset: 1005460:1b263e03d3fe
user:      ad <ad%NetBSD.org@localhost>
date:      Sun Dec 08 19:23:51 2019 +0000

description:
Avoid thundering herd: cv_broadcast(&bp->b_busy) -> cv_signal(&bp->b_busy)

diffstat:

 sys/dev/qbus/ts.c         |  6 +++---
 sys/kern/kern_physio.c    |  6 +++---
 sys/ufs/lfs/lfs_segment.c |  6 +++---
 3 files changed, 9 insertions(+), 9 deletions(-)

diffs (81 lines):

diff -r 89ec48ea810b -r 1b263e03d3fe sys/dev/qbus/ts.c
--- a/sys/dev/qbus/ts.c Sun Dec 08 18:13:24 2019 +0000
+++ b/sys/dev/qbus/ts.c Sun Dec 08 19:23:51 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: ts.c,v 1.31 2014/07/25 08:10:38 dholland Exp $ */
+/*     $NetBSD: ts.c,v 1.32 2019/12/08 19:23:51 ad Exp $ */
 
 /*-
  * Copyright (c) 1991 The Regents of the University of California.
@@ -66,7 +66,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ts.c,v 1.31 2014/07/25 08:10:38 dholland Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ts.c,v 1.32 2019/12/08 19:23:51 ad Exp $");
 
 #undef TSDEBUG
 
@@ -390,7 +390,7 @@
                return;
        biowait(bp);
        mutex_enter(&bufcache_lock);
-       cv_broadcast(&bp->b_busy);
+       cv_signal(&bp->b_busy);
        bp->b_cflags = 0;
        mutex_exit(&bufcache_lock);
 }
diff -r 89ec48ea810b -r 1b263e03d3fe sys/kern/kern_physio.c
--- a/sys/kern/kern_physio.c    Sun Dec 08 18:13:24 2019 +0000
+++ b/sys/kern/kern_physio.c    Sun Dec 08 19:23:51 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: kern_physio.c,v 1.95 2019/04/04 12:26:45 mlelstv Exp $ */
+/*     $NetBSD: kern_physio.c,v 1.96 2019/12/08 19:23:51 ad Exp $      */
 
 /*-
  * Copyright (c) 1982, 1986, 1990, 1993
@@ -71,7 +71,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: kern_physio.c,v 1.95 2019/04/04 12:26:45 mlelstv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: kern_physio.c,v 1.96 2019/12/08 19:23:51 ad Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -432,7 +432,7 @@
                obp->b_cflags &= ~(BC_BUSY | BC_WANTED);
                obp->b_flags &= ~(B_PHYS | B_RAW);
                obp->b_iodone = NULL;
-               cv_broadcast(&obp->b_busy);
+               cv_signal(&obp->b_busy);
                mutex_exit(&bufcache_lock);
        }
 
diff -r 89ec48ea810b -r 1b263e03d3fe sys/ufs/lfs/lfs_segment.c
--- a/sys/ufs/lfs/lfs_segment.c Sun Dec 08 18:13:24 2019 +0000
+++ b/sys/ufs/lfs/lfs_segment.c Sun Dec 08 19:23:51 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: lfs_segment.c,v 1.278 2018/09/03 16:29:37 riastradh Exp $      */
+/*     $NetBSD: lfs_segment.c,v 1.279 2019/12/08 19:24:26 ad Exp $     */
 
 /*-
  * Copyright (c) 1999, 2000, 2001, 2002, 2003 The NetBSD Foundation, Inc.
@@ -60,7 +60,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: lfs_segment.c,v 1.278 2018/09/03 16:29:37 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: lfs_segment.c,v 1.279 2019/12/08 19:24:26 ad Exp $");
 
 #ifdef DEBUG
 # define vndebug(vp, str) do {                                         \
@@ -2197,7 +2197,7 @@
                if (unbusybp != NULL) {
                        unbusybp->b_cflags &= ~BC_BUSY;
                        if (unbusybp->b_cflags & BC_WANTED)
-                               cv_broadcast(&bp->b_busy);
+                               cv_signal(&bp->b_busy);
                }
        }
        mutex_exit(&bufcache_lock);