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Date: Mon, 02 Dec 2002 00:51:56 -0800
From: Andrew Morton <akpm@digeo.com>
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To: Jens Axboe <axboe@suse.de>
CC: Rik van Riel <riel@conectiva.com.br>,
       Marc-Christian Petersen <m.c.p@wolk-project.de>,
       linux-kernel@vger.kernel.org, Con Kolivas <conman@kolivas.net>
Subject: Re: [PATCH] 2.4.20-rmap15a
References: <200212012155.30534.m.c.p@wolk-project.de> <Pine.LNX.4.44L.0212011921420.15981-200000@imladris.surriel.com> <20021202081524.GQ16942@suse.de>
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Jens Axboe wrote:
> 
> On Sun, Dec 01 2002, Rik van Riel wrote:
> > > So, here my patch proposal. Ontop of 2.4.20-rmap15a.
> >
> > Looks good, now lets test it.  If the patch is as needed as you
> > say we should push it to marcelo ;)
> 
> Yes lets for heavens sake not fix the problem, merge the hack.

If it fails to find a merge or insert the current 2.4 elevator
will stick a read at the far end of the request queue.  That's
quite arbitrary, and is the worst possible thing to do with it.

read-latency2 will put the read a tunable distance from the head.
Add a few embellishments to avoid permanent writer starvation,
and that's basically all it does.

So rather than just keeping on calling it a "hack" could you please
describe what is actually wrong with the idea?
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