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Re: [PATCH] swapin readahead and fixes

To: Rik van Riel <H.H.vanRiel@phys.uu.nl>
Subject: Re: [PATCH] swapin readahead and fixes
From: "Stephen C. Tweedie" <sct@redhat.com>
Date: Fri, 4 Dec 1998 11:34:18 GMT
Cc: Linux MM <linux-mm@kvack.org>, Linux Kernel <linux-kernel@vger.rutgers.edu>, Stephen Tweedie <sct@redhat.com>
In-Reply-To: <Pine.LNX.3.96.981203184928.2886A-100000@mirkwood.dummy.home>
References: <Pine.LNX.3.96.981203184928.2886A-100000@mirkwood.dummy.home>
Sender: owner-linux-mm@kvack.org

Hi,

On Thu, 3 Dec 1998 18:56:34 +0100 (CET), Rik van Riel
<H.H.vanRiel@phys.uu.nl> said:

> The swapin enhancement consists of a simple swapin readahead.

One odd thing about the readahead: you don't start the readahead until
_after_ you have synchronously read in the first swap page of the
cluster.  Surely it is better to do the readahead first, so that you
are submitting one IO to disk, not two?

--Stephen
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