Message-ID: <4BCEFBAB.4070403@redhat.com>
Date: Wed, 21 Apr 2010 09:20:43 -0400
From: Rik van Riel <riel@redhat.com>
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To: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
CC: Johannes Weiner <hannes@cmpxchg.org>, Mel Gorman <mel@csn.ul.ie>,
       Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org,
       Nick Piggin <npiggin@suse.de>, Chris Mason <chris.mason@oracle.com>,
       Jens Axboe <jens.axboe@oracle.com>, linux-kernel@vger.kernel.org,
       gregkh@novell.com, Corrado Zoccolo <czoccolo@gmail.com>
Subject: Re: [RFC PATCH 0/3] Avoid the use of congestion_wait under zone pressure
References: <20100322235053.GD9590@csn.ul.ie> <4BA940E7.2030308@redhat.com> <20100324145028.GD2024@csn.ul.ie> <4BCC4B0C.8000602@linux.vnet.ibm.com> <20100419214412.GB5336@cmpxchg.org> <4BCD55DA.2020000@linux.vnet.ibm.com> <20100420153202.GC5336@cmpxchg.org> <4BCDE2F0.3010009@redhat.com> <4BCE7DD1.70900@linux.vnet.ibm.com>
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On 04/21/2010 12:23 AM, Christian Ehrhardt wrote:

> IMHO it is fine to prevent that nightly backup job from not being
> finished when the user arrives at morning because we didn't give him
> some more cache

How on earth would a backup job benefit from cache?

It only accesses each bit of data once, so caching the
to-be-backed-up data is a waste of memory.
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