tree 3ad3d94c329095962c6cd6dcea41e1ccf2db5a7e
parent 198e2f181163233b379dc7ce8a6d7516b84042e7
author akpm@osdl.org <akpm@osdl.org> 1137056732 -0800
committer Linus Torvalds <torvalds@g5.osdl.org> 1137085730 -0800

[PATCH] sched: filter affine wakeups

)

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>