linux-ext4 - Re: [PATCH V3 0/8] Cleancache: overview

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Message-ID: <4C58424C.1020208@panasas.com>
Date:	Tue, 03 Aug 2010 19:22:36 +0300
From:	Boaz Harrosh <bharrosh@...asas.com>
To:	Dan Magenheimer <dan.magenheimer@...cle.com>
CC:	Christoph Hellwig <hch@...radead.org>, ngupta@...are.org,
	akpm@...ux-foundation.org, Chris Mason <chris.mason@...cle.com>,
	viro@...iv.linux.org.uk, adilger@....com, tytso@....edu,
	mfasheh@...e.com, Joel Becker <joel.becker@...cle.com>,
	matthew@....cx, linux-btrfs@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-ext4@...r.kernel.org, ocfs2-devel@....oracle.com,
	linux-mm@...ck.org, jeremy@...p.org, JBeulich@...ell.com,
	Kurt Hackel <kurt.hackel@...cle.com>, npiggin@...e.de,
	Dave Mccracken <dave.mccracken@...cle.com>, riel@...hat.com,
	avi@...hat.com, Konrad Wilk <konrad.wilk@...cle.com>
Subject: Re: [PATCH V3 0/8] Cleancache: overview

On 07/24/2010 12:17 AM, Dan Magenheimer wrote:
>>> On Fri, Jul 23, 2010 at 06:58:03AM -0700, Dan Magenheimer wrote:
>>>> CHRISTOPH AND ANDREW, if you disagree and your concerns have
>>>> not been resolved, please speak up.
>>
>> Hi Christoph --
>>
>> Thanks very much for the quick (instantaneous?) reply!
>>
>>> Anything that need modification of a normal non-shared fs is utterly
>>> broken and you'll get a clear NAK, so the propsal before is a good
>>> one.
>>
>> No, the per-fs opt-in is very sensible; and its design is
>> very minimal.
> 
> Not to belabor the point, but maybe the right way to think about
> this is:
> 
> Cleancache is a new optional feature provided by the VFS layer
> that potentially dramatically increases page cache effectiveness
> for many workloads in many environments at a negligible cost.
> 
> Filesystems that are well-behaved and conform to certain restrictions
> can utilize cleancache simply by making a call to cleancache_init_fs
> at mount time.  Unusual, misbehaving, or poorly layered filesystems
> must either add additional hooks and/or undergo extensive additional
> testing... or should just not enable the optional cleancache.

OK, So I maintain a filesystem in Kernel. How do I know if my FS
is not "Unusual, misbehaving, or poorly layered"

Thanks
Boaz
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