From: Peter Zijlstra <peterz@infradead.org>
Date: Mon, 10 Nov 2014 09:54:35 +0000 (+0100)
Subject: sched/numa: Avoid selecting oneself as swap target
X-Git-Tag: omap-for-v3.19/fixes-for-merge-window~94^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7af683350cb0ddd0e9d3819b4eb7abe9e2d3e709;p=pandora-kernel.git

sched/numa: Avoid selecting oneself as swap target

Because the whole numa task selection stuff runs with preemption
enabled (its long and expensive) we can end up migrating and selecting
oneself as a swap target. This doesn't really work out well -- we end
up trying to acquire the same lock twice for the swap migrate -- so
avoid this.

Reported-and-Tested-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/20141110100328.GF29390@twins.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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