From: Oleg Nesterov <oleg@tv-sign.ru>
Date: Wed, 9 May 2007 09:33:54 +0000 (-0700)
Subject: flush_cpu_workqueue: don't flush an empty ->worklist
X-Git-Tag: v2.6.22-rc1~247
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=83c22520c51bf67529367e8237f95c03fe44e2da;p=pandora-kernel.git

flush_cpu_workqueue: don't flush an empty ->worklist

Now when we have ->current_work we can avoid adding a barrier and waiting
for its completition when cwq's queue is empty.

Note: this change is also useful if we change flush_workqueue() to also
check the dead CPUs.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Srivatsa Vaddagiri <vatsa@in.ibm.com>
Cc: Gautham Shenoy <ego@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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