linux-kernel - Re: [PATCH 4/4] sched: force balancing on newidle balance if local group has capacity

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Message-ID: <1287144482.29097.1463.camel@twins>
Date:	Fri, 15 Oct 2010 14:08:02 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Nikhil Rao <ncrao@...gle.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Mike Galbraith <efault@....de>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Venkatesh Pallipadi <venki@...gle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] sched: force balancing on newidle balance if local
 group has capacity

On Wed, 2010-10-13 at 12:09 -0700, Nikhil Rao wrote:
> @@ -2824,6 +2845,10 @@ find_busiest_group(struct sched_domain *sd, int
> this_cpu,
>         if (!sds.busiest || sds.busiest_nr_running == 0)
>                 goto out_balanced;
>  
> +       /*  SD_BALANCE_NEWIDLE trumps SMP nice when underutilized */
> +       if (idle == CPU_NEWLY_IDLE && check_utilization(&sds))
> +               goto force_balance;


There's a large comment a few lines up from here that tries to explain
all these funny reasons for not balancing, that wants updating too.


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