sched/numa: Avoid selecting oneself as swap target

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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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Peter Zijlstra 2014-11-10 10:54:35 +01:00 • committed by Ingo Molnar

parent c123588b3b

commit 7af683350c

1 changed files with 7 additions and 0 deletions

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kernel/sched/fair.c

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