From: Peter Zijlstra <peterz@infradead.org>
Date: Sat, 11 Feb 2012 05:05:00 +0000 (+0100)
Subject: sched/fair: Track cgroup depth
X-Git-Tag: v3.15-rc1~116^2~48
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fed14d45f945042a15b09de48d7d3d58d9455fc4;p=pandora-kernel.git

sched/fair: Track cgroup depth

Track depth in cgroup tree, this is useful for things like
find_matching_se() where you need to get to a common parent of two
sched entities.

Keeping the depth avoids having to calculate it on the spot, which
saves a number of possible cache-misses.

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1328936700.2476.17.camel@laptop
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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