tree 1b77f5f5a8516737e3f1f62290c08fe093cff661
parent 7897986bad8f6cd50d6149345aca7f6480f49464
author Nick Piggin <nickpiggin@yahoo.com.au> 1119736635 -0700
committer Linus Torvalds <torvalds@ppc970.osdl.org> 1119741881 -0700

[PATCH] sched: tweak affine wakeups

Do less affine wakeups.  We're trying to reduce dbt2-pgsql idle time
regressions here...  make sure we don't don't move tasks the wrong way in an
imbalance condition.  Also, remove the cache coldness requirement from the
calculation - this seems to induce sharp cutoff points where behaviour will
suddenly change on some workloads if the load creeps slightly over or under
some point.  It is good for periodic balancing because in that case have
otherwise have no other context to determine what task to move.

But also make a minor tweak to "wake balancing" - the imbalance tolerance is
now set at half the domain's imbalance, so we get the opportunity to do wake
balancing before the more random periodic rebalancing gets preformed.

Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>