linux-kernel - Re: [PATCH] sched: fix updating sd->balance_interval in idle

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Message-ID: <1274339809.5605.13119.camel@twins>
Date:	Thu, 20 May 2010 09:16:49 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Nikhil Rao <ncrao@...gle.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Mike Galbraith <efault@....de>,
	Venkatesh Pallipadi <venki@...gle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sched: fix updating sd->balance_interval in
 idle_balance()

On Wed, 2010-05-19 at 16:45 -0700, Nikhil Rao wrote:
> sd->balance_interval is updated incorrectly when SD_BALANCE_NEWIDLE is not set
> in sd->flags. This patch updates sd->balance_interval only when we balance the
> domain. 

I really need more than that.

Why is it wrong, what are the (measurable) effects of changing it and
how did it come to be this way.

I could of course go and try to reverse engineer your patch, but it
would be awesome if I didn't have to.
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