From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Date: Sat, 22 Jun 2013 00:10:40 +0000 (-0700)
Subject: nohz_full: Force RCU's grace-period kthreads onto timekeeping CPU
X-Git-Tag: v3.12-rc1~170^2^2^3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=eb75767be0e514f97bf1b5cec763696cfc7f7e2a;p=pandora-kernel.git

nohz_full: Force RCU's grace-period kthreads onto timekeeping CPU

Because RCU's quiescent-state-forcing mechanism is used to drive the
full-system-idle state machine, and because this mechanism is executed
by RCU's grace-period kthreads, this commit forces these kthreads to
run on the timekeeping CPU (tick_do_timer_cpu).  To do otherwise would
mean that the RCU grace-period kthreads would force the system into
non-idle state every time they drove the state machine, which would
be just a bit on the futile side.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
---

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