From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Date: Fri, 19 Mar 2010 04:36:51 +0000 (-0700)
Subject: rcu: substitute set_need_resched for sending resched IPIs
X-Git-Tag: v2.6.35-rc1~524^2~22
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d25eb9442bb2c38c1e742f0fa764d7132d72593f;p=pandora-kernel.git

rcu: substitute set_need_resched for sending resched IPIs

This patch adds a check to __rcu_pending() that does a local
set_need_resched() if the current CPU is holding up the current grace
period and if force_quiescent_state() will be called soon.  The goal is
to reduce the probability that force_quiescent_state() will need to do
smp_send_reschedule(), which sends an IPI and is therefore more expensive
on most architectures.

Signed-off-by: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
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