linux-kernel - Re: [Bug #14620] WARNING: at mm/page_alloc.c:1805 __alloc_pages

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Message-ID: <20091117024318.GC23066@mit.edu>
Date:	Mon, 16 Nov 2009 21:43:18 -0500
From:	Theodore Tso <tytso@....edu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Rogério Brito <rbrito@....usp.br>
Subject: Re: [Bug #14620] WARNING: at mm/page_alloc.c:1805
	__alloc_pages_nodemask

On Mon, Nov 16, 2009 at 11:37:47PM +0100, Rafael J. Wysocki wrote:
> This message has been generated automatically as a part of a report
> of recent regressions.
> 
> The following bug entry is on the current list of known regressions
> from 2.6.31.  Please verify if it still should be listed and let me know
> (either way).
> 
> 
> Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=14620
> Subject		: WARNING: at mm/page_alloc.c:1805 __alloc_pages_nodemask
> Submitter	: Rogério Brito <rbrito@....usp.br>
> Date		: 2009-11-06 23:10 (11 days old)
> References	: http://marc.info/?l=linux-kernel&m=125754907413892&w=4

This isn't technically a regression, since the warning is simply
complaining about something that apparently ext4 has been doing for a
long time, which is that it allocates some very large order data
buffers.  So the change referenced simply printed a warning message
that complained about the fact.

The actual problem will be fixed in 2.6.32, as we no longer allocate
the big data buffers at mount time.

						- Ted
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