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Date: Mon, 08 Oct 2001 16:01:05 +0100
From: Alex Bligh - linux-kernel <linux-kernel@alex.org.uk>
Reply-To: Alex Bligh - linux-kernel <linux-kernel@alex.org.uk>
To: "Eric W. Biederman" <ebiederman@uswest.net>,
        Alex Bligh - linux-kernel <linux-kernel@alex.org.uk>
Cc: Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz>,
        Rik van Riel <riel@conectiva.com.br>,
        Krzysztof Rusocki <kszysiu@main.braxis.co.uk>, linux-xfs@oss.sgi.com,
        linux-kernel@vger.kernel.org,
        Alex Bligh - linux-kernel <linux-kernel@alex.org.uk>
Subject: Re: %u-order allocation failed
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--On Sunday, October 07, 2001 12:30 PM -0600 "Eric W. Biederman" 
<ebiederman@uswest.net> wrote:

>> Note also that something (not sure what) has made fragmentation
>> increasingly prevalent over the years since the buddy allocator
>> was originally put in.
>
> Actually it seems to be situations like the stack now being two pages

Instrumentation posted here before appears to corellate fragmentation
being /caused/ with I/O activity (single bonnie process and thus a
single 8k stack frame). My own guess is that it is due to
a different persistence of various caches.

I haven't seen anyone before blaming stack frame allocation
as a /cause/ of fragmenation - I've heard people say they
notice fragmentation more as stack frame allocs start to
fail - but that's a symptom.

--
Alex Bligh
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