From: Paul E. McKenney <paul.mckenney@linaro.org>
Date: Tue, 10 Jan 2012 22:13:24 +0000 (-0800)
Subject: rcu: Limit lazy-callback duration
X-Git-Tag: v3.4-rc1~194^2^2~34
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=778d250a29224795e6320b58928bafa6b6104a06;p=pandora-kernel.git

rcu: Limit lazy-callback duration

Currently, a given CPU is permitted to remain in dyntick-idle mode
indefinitely if it has only lazy RCU callbacks queued.  This is vulnerable
to corner cases in NUMA systems, so limit the time to six seconds by
default.  (Currently controlled by a cpp macro.)

Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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