From: Rik van Riel <H.H.vanRiel@phys.uu.nl>
To: "Stephen C. Tweedie" <sct@redhat.com>
Cc: Linux MM <linux-mm@kvack.org>,
Linux Kernel <linux-kernel@vger.rutgers.edu>
Subject: Re: [PATCH] swapin readahead and fixes
Date: Fri, 4 Dec 1998 15:02:56 +0100 (CET) [thread overview]
Message-ID: <Pine.LNX.3.96.981204150030.15134N-100000@mirkwood.dummy.home> (raw)
In-Reply-To: <199812041134.LAA01682@dax.scot.redhat.com>
On Fri, 4 Dec 1998, Stephen C. Tweedie wrote:
> 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?
This would severely suck when something else would be doing
a run_taskqueue(&tq_disk). It would mean that we'd read
n+1..n+15 before n itself.
OTOH, if the disk is lightly loaded it would be an advantage.
I will try it shortly (but don't know how to measure the
results :)...
cheers,
Rik -- the flu hits, the flu hits, the flu hits -- MORE
+-------------------------------------------------------------------+
| Linux memory management tour guide. H.H.vanRiel@phys.uu.nl |
| Scouting Vries cubscout leader. http://www.phys.uu.nl/~riel/ |
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next prev parent reply other threads:[~1998-12-04 14:15 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
1998-12-03 17:56 Rik van Riel
1998-12-04 11:34 ` Stephen C. Tweedie
1998-12-04 14:02 ` Rik van Riel [this message]
1998-12-04 14:34 ` Stephen C. Tweedie
1998-12-05 9:46 ` Gerard Roudier
1998-12-07 16:50 ` Stephen C. Tweedie
1998-12-08 1:34 ` Billy Harvey
1998-12-08 2:31 ` Rik van Riel
1998-12-08 2:51 ` Billy Harvey
1998-12-08 3:00 ` Rik van Riel
1998-12-08 12:35 ` Stephen C. Tweedie
1998-12-08 13:51 ` Rik van Riel
1998-12-09 2:41 ` Drago Goricanec
1998-12-09 11:58 ` Stephen C. Tweedie
1998-12-08 12:21 ` Stephen C. Tweedie
1998-12-05 10:47 ` Gerard Roudier
1998-12-04 19:25 ` Chris Evans
1998-12-04 20:47 ` Rik van Riel
1998-12-05 18:59 ` Alan Cox
1998-12-05 19:02 ` Rik van Riel
1998-12-06 5:20 ` Rik van Riel
1998-12-06 5:23 ` Steve VanDevender
1998-12-07 11:52 ` Rik van Riel
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