linux-kernel - Re: [PATCH 2/2] mm: make do

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Message-ID: <20120203140834.GA15495@infradead.org>
Date:	Fri, 3 Feb 2012 09:08:34 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Amit Sahrawat <amit.sahrawat83@...il.com>, Jan Kara <jack@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Johannes Weiner <jweiner@...hat.com>,
	Amit Sahrawat <a.sahrawat@...sung.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] mm: make do_writepages() use plugging

On Fri, Feb 03, 2012 at 09:38:23PM +0800, Wu Fengguang wrote:
> On Fri, Feb 03, 2012 at 06:57:06PM +0530, Amit Sahrawat wrote:
> > This will cover all the invocations for writepages to be called with
> > plugging support.
>  
> Thanks.  I'll test it on the major filesystems. But would you
> name a few filesystems that are expected to benefit from it?
> It's not obvious because some FS ->writepages eventually calls
> generic_writepages() which already does plugging.

Ant that's exactly where it should stay instead of beeing sprinkled all
over the VM code.

NAK to the patch.

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