linux-kernel - Re: [patch 00/14] Page cache cleanup in anticipation of Large Blocksize support

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Message-ID: <20070617050255.GM11166@waste.org>
Date:	Sun, 17 Jun 2007 00:02:55 -0500
From:	Matt Mackall <mpm@...enic.com>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <clameter@....com>,
	linux-kernel@...r.kernel.org, hch@...radead.org
Subject: Re: [patch 00/14] Page cache cleanup in anticipation of Large Blocksize support

On Sat, Jun 16, 2007 at 06:25:00PM -0700, Arjan van de Ven wrote:
> 
> > You: conceptully-new add-on which benefits 0.25% of the user base, provided
> > they select the right config options and filesystem.
> > 
> > Me: simpler enhancement which benefits 100% of the user base (ie: includes
> > 4k blocksize, 4k pagesize) and which also fixes your performance problem
> > with that HBA.
> 
> note that at least 2.6 is doing this "sort of", better than 2.4 at
> least. (30% hitrate or something like that).

Is it? Last I looked it had reverted to handing out reverse-contiguous
pages.

You can see this by running /proc/pid/pagemap through hexdump.

-- 
Mathematics is the supreme nostalgia of our time.
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