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Date: Tue, 22 Jan 2002 21:34:56 -0200 (BRST)
From: Rik van Riel <riel@conectiva.com.br>
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To: Hans Reiser <reiser@namesys.com>
Cc: Chris Mason <mason@suse.com>, Andreas Dilger <adilger@turbolabs.com>,
        Shawn Starr <spstarr@sh0n.net>, <linux-kernel@vger.kernel.org>,
        <ext2-devel@lists.sourceforge.net>
Subject: Re: Possible Idea with filesystem buffering.
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On Wed, 23 Jan 2002, Hans Reiser wrote:

> Let's try a non-reiserfs sub-cache example.  Suppose you have a cache
> of objects that are smaller than a page.

> Suppose that there is absolutely no correlation in access between the
> objects that are on the same page.  Suppose that this subcache has
> methods for freeing however many of them it wants to free, and it can
> squeeze them together into fewer pages whenever it wants to.

In this case I absolutely agree with you.

In this case it is also _possible_ because all access
to these data structures goes through the filesystem
code, so the filesystem knows exactly which object is
a candidate for freeing and which isn't.

I think the last messages from the thread were a
miscommunication between us -- I was under the impression
that you wanted per-filesystem freeing decisions for things
like page cache pages.

kind regards,

Rik
-- 
"Linux holds advantages over the single-vendor commercial OS"
    -- Microsoft's "Competing with Linux" document

http://www.surriel.com/		http://distro.conectiva.com/

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