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Date: Mon, 30 Jun 2014 15:09:14 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Mel Gorman <mgorman@suse.de>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>, Linux-MM <linux-mm@kvack.org>,
        Linux-FSDevel <linux-fsdevel@vger.kernel.org>,
        Johannes Weiner <hannes@cmpxchg.org>
Subject: Re: [PATCH 4/4] mm: page_alloc: Reduce cost of the fair zone
 allocation policy
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On Mon, 30 Jun 2014 22:51:21 +0100 Mel Gorman <mgorman@suse.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?