linux-kernel - Re: [PATCH 01/13] fs: Use a common define for inode slab caches

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Message-ID: <20110823092041.GX3162@dastard>
Date:	Tue, 23 Aug 2011 19:20:41 +1000
From:	Dave Chinner <david@...morbit.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org, khlebnikov@...nvz.org
Subject: Re: [PATCH 01/13] fs: Use a common define for inode slab caches

On Tue, Aug 23, 2011 at 05:13:07AM -0400, Christoph Hellwig wrote:
> On Tue, Aug 23, 2011 at 06:56:14PM +1000, Dave Chinner wrote:
> > From: Dave Chinner <dchinner@...hat.com>
> > 
> > All inode slab cache initialisation calls need to use specific flags
> > so that certain core functionality works correctly (e.g. reclaimable
> > memory accounting). Some of these flags are used inconsistently
> > across different filesystems, so inode cache slab behaviour can vary
> > according to filesystem type.
> > 
> > Wrap all the SLAB_* flags relevant to inode caches up into a single
> > SLAB_INODES flag and convert all the inode caches to use the new
> > flag.
> 
> Why do we keep the SLAB_HWCACHE_ALIGN flag for some filesystems?

I didn't touch that one, mainly because I think that there are
different reasons for wanting cacheline alignment. e.g. a filesystem
aimed primarily at embedded systms with slow CPUs and little memory
doesn't want to waste memory on cacheline alignment....

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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