linux-kernel - Re: [PATCH 4/4] mm: page_alloc: Reduce cost of the fair zone allocation policy

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Message-Id: <20140630150914.6db3805c28c60283deb94206@linux-foundation.org>
Date:	Mon, 30 Jun 2014 15:09:14 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>,
	Linux-FSDevel <linux-fsdevel@...r.kernel.org>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH 4/4] mm: page_alloc: Reduce cost of the fair zone
 allocation policy

On Mon, 30 Jun 2014 22:51:21 +0100 Mel Gorman <mgorman@...e.de> wrote:

> > That's a large change in system time.  Does this all include kswapd
> > activity?
> > 
> 
> I don't have a profile to quantify that exactly. It takes 7 hours to
> complete a test on that machine in this configuration

That's nuts.  Why should measuring this require more than a few minutes?
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