linux-kernel - Re: [BUG] idle_balance() does not call load_balance

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Date:	Mon, 8 Dec 2008 16:49:39 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Gautham R Shenoy <ego@...ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [BUG] idle_balance() does not call load_balance_newidle()


* Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com> wrote:

> Hi,
> 
> load_balance_newidle() does not get called if SD_BALANCE_NEWIDLE is
> set at higher level domain (3-CPU) and not in low level domain (2-MC).
> 
> pulled_task is initialised to -1 and checked for non-zero which is
> always true if the lowest level sched_domain does not have
> SD_BALANCE_NEWIDLE flag set.
> 
> Trivial fix to initialise pulled_task to zero.
> Patch against 2.6.28-rc7

applied to tip/sched/core, thanks! (Not for v2.6.28 because this could 
affect performance.)

	Ingo
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