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Date: Thu, 07 May 2009 11:59:18 -0400
From: Rik van Riel <riel@redhat.com>
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To: Christoph Lameter <cl@linux.com>
CC: Peter Zijlstra <peterz@infradead.org>,
       Wu Fengguang <fengguang.wu@intel.com>,
       Andrew Morton <akpm@linux-foundation.org>,
       "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
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       Nick Piggin <npiggin@suse.de>, Johannes Weiner <hannes@cmpxchg.org>,
       KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Subject: Re: [PATCH -mm] vmscan: make mapped executable pages the first class
 citizen
References: <20090430072057.GA4663@eskimo.com>  <20090430174536.d0f438dd.akpm@linux-foundation.org>  <20090430205936.0f8b29fc@riellaptop.surriel.com>  <20090430181340.6f07421d.akpm@linux-foundation.org>  <20090430215034.4748e615@riellaptop.surriel.com>  <20090430195439.e02edc26.akpm@linux-foundation.org>  <49FB01C1.6050204@redhat.com>  <20090501123541.7983a8ae.akpm@linux-foundation.org>  <20090503031539.GC5702@localhost> <1241432635.7620.4732.camel@twins>  <20090507121101.GB20934@localhost>  <alpine.DEB.1.10.0905070935530.24528@qirst.com>  <1241705702.11251.156.camel@twins>  <alpine.DEB.1.10.0905071016410.24528@qirst.com> <1241707081.11251.160.camel@twins> <alpine.DEB.1.10.0905071120110.10171@qirst.com>
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Christoph Lameter wrote:
> On Thu, 7 May 2009, Peter Zijlstra wrote:
> 
>> So if you haven't ran any firefox code, it should be gone from the
>> active list after 2 full cycles, and from the inactive list on the first
>> full inactive cycle after that.
> 
> So some incremental changes. I still want to use firefox after my backup
> without having to wait 5 minutes while its paging exec pages back in.

Please try to read and understand the patches, before
imagining that they might not be enough.

The active file list is kept at least as large as
the inactive file list.  Your backup is one large
streaming IO.  This means the files touched by
your backup should go onto the inactive file list
and get reclaimed, without putting pressure on
the active file list.

If you are still not convinced that these (small)
changes are enough, please test the patches and
show us the results, so we can tweak things further.