From: Christoph Lameter <clameter@sgi.com>
To: akpm@osdl.org
Cc: Peter Williams <pwil3058@bigpond.net.au>,
linux-kernel@vger.kernel.org,
Nick Piggin <nickpiggin@yahoo.com.au>,
Christoph Lameter <clameter@sgi.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Ingo Molnar <mingo@elte.hu>,
"Siddha, Suresh B" <suresh.b.siddha@intel.com>
Subject: [PATCH 1/7] Avoid taking rq lock in wake_priority_sleeper
Date: Fri, 27 Oct 2006 19:41:17 -0700 (PDT) [thread overview]
Message-ID: <20061028024117.10809.74875.sendpatchset@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <20061028024112.10809.15841.sendpatchset@schroedinger.engr.sgi.com>
Avoid taking the rq lock in wake_priority sleeper
Avoid taking the request queue lock in wake_priority_sleeper if
there are no running processes.
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Index: linux-2.6.19-rc3/kernel/sched.c
===================================================================
--- linux-2.6.19-rc3.orig/kernel/sched.c 2006-10-26 21:30:11.328325096 -0500
+++ linux-2.6.19-rc3/kernel/sched.c 2006-10-27 11:58:02.142767971 -0500
@@ -2898,6 +2898,9 @@ static inline int wake_priority_sleeper(
int ret = 0;
#ifdef CONFIG_SCHED_SMT
+ if (!rq->nr_running)
+ return 0;
+
spin_lock(&rq->lock);
/*
* If an SMT sibling task has been put to sleep for priority
next prev parent reply other threads:[~2006-10-28 2:41 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-28 2:41 [PATCH 0/7] sched_domain balancing via tasklet V2 Christoph Lameter
2006-10-28 2:41 ` Christoph Lameter [this message]
2006-10-28 2:41 ` [PATCH 2/7] Disable interrupts for locking in load_balance() Christoph Lameter
2006-10-28 2:41 ` [PATCH 3/7] Extract load calculation from rebalance_tick Christoph Lameter
2006-10-28 2:41 ` [PATCH 4/7] Stagger load balancing in build_sched_domains Christoph Lameter
2006-10-28 2:41 ` [PATCH 5/7] Move idle stat calculation into rebalance_tick() Christoph Lameter
2006-10-28 17:57 ` Siddha, Suresh B
2006-10-29 1:05 ` Christoph Lameter
2006-10-28 2:41 ` [PATCH 6/7] Use tasklet to call balancing Christoph Lameter
2006-10-28 2:41 ` [PATCH 7/7] Call tasklet less frequently Christoph Lameter
-- strict thread matches above, loose matches on Subject: below --
2006-11-03 20:46 [PATCH 0/7] sched_domain balancing via tasklet V3 Christoph Lameter
2006-11-03 20:46 ` [PATCH 1/7] Avoid taking rq lock in wake_priority_sleeper Christoph Lameter
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