Message-ID: <49F9A2B6.6070801@redhat.com>
Date: Thu, 30 Apr 2009 09:08:06 -0400
From: Rik van Riel <riel@redhat.com>
Organization: Red Hat, Inc
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To: Elladan <elladan@eskimo.com>
CC: Peter Zijlstra <peterz@infradead.org>, linux-kernel@vger.kernel.org,
       tytso@mit.edu, kosaki.motohiro@jp.fujitsu.com, linux-mm@kvack.org
Subject: Re: [PATCH] vmscan: evict use-once pages first (v2)
References: <20090428044426.GA5035@eskimo.com> <20090428192907.556f3a34@bree.surriel.com> <1240987349.4512.18.camel@laptop> <20090429114708.66114c03@cuia.bos.redhat.com> <20090430072057.GA4663@eskimo.com>
In-Reply-To: <20090430072057.GA4663@eskimo.com>
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Elladan wrote:

>> Elladan, does this smaller patch still work as expected?

> The system does seem relatively responsive with this patch for the most part,
> with occasional lag.  I don't see much evidence at least over the course of a
> few minutes that it pages out applications significantly.  It seems about
> equivalent to the first patch.

OK, good to hear that.

> This seems ok (not disastrous, anyway).  I suspect desktop users would
> generally prefer the VM were extremely aggressive about keeping their
> executables paged in though, 

I agree that desktop users would probably prefer something even
more aggressive.  However, we do need to balance this against
other workloads, where inactive file pages need to be given a
fair chance to be referenced twice and promoted to the active
file list.

Because of that, I have chosen a patch with a minimal risk of
regressions on any workload.

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