From: akpm@osdl.org <akpm@osdl.org>
Date: Thu, 12 Jan 2006 09:05:32 +0000 (-0800)
Subject: [PATCH] sched: filter affine wakeups
X-Git-Tag: v2.6.16-rc1~274
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d7102e95b7b9c00277562c29aad421d2d521c5f6;p=pandora-kernel.git

[PATCH] sched: filter affine wakeups


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From: Nick Piggin <nickpiggin@yahoo.com.au>

Track the last waker CPU, and only consider wakeup-balancing if there's a
match between current waker CPU and the previous waker CPU.  This ensures
that there is some correlation between two subsequent wakeup events before
we move the task.  Should help random-wakeup workloads on large SMP
systems, by reducing the migration attempts by a factor of nr_cpus.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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