linux-ext4 - Re: upcoming kerneloops.org item: get_page_from

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Message-ID: <20090625220504.GG6472@mit.edu>
Date:	Thu, 25 Jun 2009 18:05:04 -0400
From:	Theodore Tso <tytso@....edu>
To:	Andreas Dilger <adilger@....com>
Cc:	David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	penberg@...helsinki.fi, arjan@...radead.org,
	linux-kernel@...r.kernel.org, cl@...ux-foundation.org,
	npiggin@...e.de, linux-ext4@...r.kernel.org
Subject: Re: upcoming kerneloops.org item: get_page_from_freelist

On Thu, Jun 25, 2009 at 11:26:28PM +0200, Andreas Dilger wrote:
> IIRC there was also a good reason for this in the past, related to
> the buffers being submitted to the block device layer, and if they
> were allocated from the slab cache with CONFIG_DEBUG_SLAB or something
> similar enabled the buffer would be misaligned and cause grief.

So what does SLAB/SLUB/SLOB do if we create a slab cache which is a
power of two?  Can one of the allocators still return misaligned
blocks of memory in some circumstances?

						- Ted
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