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Date: Tue, 24 Jul 2001 17:27:31 -0300 (BRT)
From: Marcelo Tosatti <marcelo@conectiva.com.br>
To: Daniel Phillips <phillips@bonn-fries.net>
Cc: linux-kernel@vger.kernel.org, Rik van Riel <riel@conectiva.com.br>,
        Ben LaHaise <bcrl@redhat.com>, Mike Galbraith <mikeg@wen-online.de>
Subject: Re: [RFC] Optimization for use-once pages
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On Tue, 24 Jul 2001, Daniel Phillips wrote:

> Today's patch tackles the use-once problem, that is, the problem of
> how to identify and discard pages containing data likely to be used 
> only once in a long time, while retaining pages that are used more 
> often.
> 
> I'll try to explain not only what I did, but the process I went
> through to arrive at this particular approach.  This requires some 
> background.

Well, as I see the patch should remove the problem where drop_behind()
deactivates pages of a readahead window even if some of those pages are
not "used-once" pages, right ? 

I just want to make sure the performance improvements you're seeing caused
by the fix of this _particular_ problem.

If we knew the amount of non-used-once pages which drop_behind() is
deactivating under _your_ tests, we could make absolute sure about the
problem. 



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