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authorPeter Zijlstra <peterz@infradead.org>2012-03-01 15:04:46 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-05-07 08:56:50 -0700
commit7bfac470b517b18d496e96acc90be58353df2159 (patch)
treee7daf536ab63883eafc14e076b848bb331f8a618 /fs
parentaef49be82379e995b42648f36dd02d70f979ef2a (diff)
sched: Fix nohz load accounting -- again!
commit c308b56b5398779cd3da0f62ab26b0453494c3d4 upstream. [ backported to 3.0 by Kerin Millar <kerframil@gmail.com>] Various people reported nohz load tracking still being wrecked, but Doug spotted the actual problem. We fold the nohz remainder in too soon, causing us to loose samples and under-account. So instead of playing catch-up up-front, always do a single load-fold with whatever state we encounter and only then fold the nohz remainder and play catch-up. Reported-by: Doug Smythies <dsmythies@telus.net> Reported-by: LesÃ…=82aw Kope=C4=87 <leslaw.kopec@nasza-klasa.pl> Reported-by: Aman Gupta <aman@tmm1.net> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/n/tip-4v31etnhgg9kwd6ocgx3rxl8@git.kernel.org Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Kerin Millar <kerframil@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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