From: Mike Galbraith <efault@gmx.de>
Date: Fri, 29 Apr 2011 06:36:50 +0000 (+0200)
Subject: sched, rt: Update rq clock when unthrottling of an otherwise idle CPU
X-Git-Tag: v3.0-rc1~403^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=61eadef6a9bde9ea62fda724a9cb501ce9bc925a;p=pandora-kernel.git

sched, rt: Update rq clock when unthrottling of an otherwise idle CPU

If an RT task is awakened while it's rt_rq is throttled, the time between
wakeup/enqueue and unthrottle/selection may be accounted as rt_time
if the CPU is idle.  Set rq->skip_clock_update negative upon throttle
release to tell put_prev_task() that we need a clock update.

Reported-by: Thomas Giesel <skoe@directbox.com>
Signed-off-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1304059010.7472.1.camel@marge.simson.net
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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