linux-kernel - Re: [PATCH 4/4] dmapool: Improve memory usage for devices which can't cross boundaries

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Message-Id: <20070926.141444.77257648.davem@davemloft.net>
Date:	Wed, 26 Sep 2007 14:14:44 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	willy@...ux.intel.com
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] dmapool: Improve memory usage for devices which
 can't cross boundaries

From: Matthew Wilcox <willy@...ux.intel.com>
Date: Wed, 26 Sep 2007 15:01:19 -0400

> The previous implementation simply refused to allocate more than a
> boundary's worth of data from an entire page.  Some users didn't know
> this, so specified things like SMP_CACHE_BYTES, not realising the
> horrible waste of memory that this was.  It's fairly easy to correct
> this problem, just by ensuring we don't cross a boundary within a page.
> This even helps drivers like EHCI (which can't cross a 4k boundary)
> on machines with larger page sizes.
> 
> Signed-off-by: Matthew Wilcox <willy@...ux.intel.com>

This one looks good to me:

Acked-by: David S. Miller <davem@...emloft.net>
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