linux-kernel - Re: [RFC PATCH 0/3] Avoid the use of congestion

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Message-ID: <4BCEFBAB.4070403@redhat.com>
Date:	Wed, 21 Apr 2010 09:20:43 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Christian Ehrhardt <ehrhardt@...ux.vnet.ibm.com>
CC:	Johannes Weiner <hannes@...xchg.org>, Mel Gorman <mel@....ul.ie>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	Nick Piggin <npiggin@...e.de>,
	Chris Mason <chris.mason@...cle.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	linux-kernel@...r.kernel.org, gregkh@...ell.com,
	Corrado Zoccolo <czoccolo@...il.com>
Subject: Re: [RFC PATCH 0/3] Avoid the use of congestion_wait under zone pressure

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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