linux-kernel - Re: [PATCH 6/6] numa,sched: normalize faults

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Message-ID: <20140117095459.GF11314@laptop.programming.kicks-ass.net>
Date:	Fri, 17 Jan 2014 10:54:59 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	riel@...hat.com
Cc:	linux-kernel@...r.kernel.org, linux-mm@...r.kernel.org,
	mingo@...hat.com, chegu_vinod@...com, mgorman@...e.de,
	Rik van Riel <riel@...riel.com>
Subject: Re: [PATCH 6/6] numa,sched: normalize faults_from stats and weigh by
 CPU use

On Fri, Jan 17, 2014 at 01:17:36AM -0500, riel@...hat.com wrote:
> +			/*
> +			 * Normalize the faults_from, so all tasks in a group
> +			 * count according to CPU use, instead of by the raw
> +			 * number of faults. This prevents the situation where
> +			 * the garbage collector totally dominates the stats,
> +			 * and the access patterns of the worker threads are
> +			 * ignored.
> +			 */

Instead of focusing on the one example (GC) here, I would suggest
saying something along the lines of: Tasks with little runtime have
little over-all impact on throughput and thus their faults are less
important.
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