From: Tejun Heo <tj@kernel.org>
Date: Tue, 29 Jun 2010 08:07:12 +0000 (+0200)
Subject: workqueue: implement worker states
X-Git-Tag: v2.6.36-rc1~506^2~36
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c8e55f360210c1bc49bea5d62bc3939b7ee13483;p=pandora-kernel.git

workqueue: implement worker states

Implement worker states.  After created, a worker is STARTED.  While a
worker isn't processing a work, it's IDLE and chained on
gcwq->idle_list.  While processing a work, a worker is BUSY and
chained on gcwq->busy_hash.  Also, gcwq now counts the number of all
workers and idle ones.

worker_thread() is restructured to reflect state transitions.
cwq->more_work is removed and waking up a worker makes it check for
events.  A worker is killed by setting DIE flag while it's IDLE and
waking it up.

This gives gcwq better visibility of what's going on and allows it to
find out whether a work is executing quickly which is necessary to
have multiple workers processing the same cwq.

Signed-off-by: Tejun Heo <tj@kernel.org>
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