From: Dimitri Sivanich <sivanich@sgi.com>
Date: Fri, 29 Jun 2012 21:17:29 +0000 (-0700)
Subject: rcu: Segregate rcu_state fields to improve cache locality
X-Git-Tag: omap-for-v3.7-rc1/fixes-cpufreq-signed~101^2~1^2~17
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b402b73b3afe3614bc0e921ebe18013ea103115a;p=pandora-kernel.git

rcu: Segregate rcu_state fields to improve cache locality

The fields in the rcu_state structure that are protected by the
root rcu_node structure's ->lock can share a cache line with the
fields protected by ->onofflock.  This can result in excessive
memory contention on large systems, so this commit applies
____cacheline_internodealigned_in_smp to the ->onofflock field in
order to segregate them.

Signed-off-by: Dimitri Sivanich <sivanich@sgi.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Tested-by: Dimitri Sivanich <sivanich@sgi.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
---

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