linux-kernel - Re: [PATCH v7 8/8] sched: idle_balance() does not call load_balance

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Date:	Thu, 18 Dec 2008 23:42:52 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Suresh B Siddha <suresh.b.siddha@...el.com>,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Vatsa <vatsa@...ux.vnet.ibm.com>,
	Gautham R Shenoy <ego@...ibm.com>,
	Andi Kleen <andi@...stfloor.org>,
	David Collier-Brown <davecb@....com>,
	Tim Connors <tconnors@...ro.swin.edu.au>,
	Max Krasnyansky <maxk@...lcomm.com>,
	Gregory Haskins <gregory.haskins@...il.com>,
	Pavel Machek <pavel@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v7 8/8] sched: idle_balance() does not call
	load_balance_newidle()

* Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com> [2008-12-18 23:26:59]:

> 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.
> 
> This patch has been queued for 2.6.29
> http://lkml.org/lkml/2008/12/8/213
> 
> Signed-off-by: Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>
> ---
> 
>  kernel/sched.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/kernel/sched.c b/kernel/sched.c
> index f82a7a0..e6a88bf 100644
> --- a/kernel/sched.c
> +++ b/kernel/sched.c
> @@ -3773,7 +3773,7 @@ out_balanced:
>  static void idle_balance(int this_cpu, struct rq *this_rq)
>  {
>  	struct sched_domain *sd;
> -	int pulled_task = -1;
> +	int pulled_task = 0;
>  	unsigned long next_balance = jiffies + HZ;
>  	cpumask_t tmpmask;
>

Isn't this already in Ingo's patch queue? 

-- 
	Balbir
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