linux-kernel - Re: [PATCH 05/10] writeback: support

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Message-ID: <20090831173223.GY12579@kernel.dk>
Date:	Mon, 31 Aug 2009 19:32:24 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	chris.mason@...cle.com, david@...morbit.com,
	akpm@...ux-foundation.org, jack@...e.cz
Subject: Re: [PATCH 05/10] writeback: support > 1 flusher thread per bdi

On Mon, Aug 31 2009, Christoph Hellwig wrote:
> On Mon, Aug 31, 2009 at 02:14:46PM +0200, Jens Axboe wrote:
> > Build on the bdi_writeback support by allowing registration of
> > more than 1 flusher thread. File systems can call bdi_add_flusher_task(bdi)
> > to add more flusher threads to the device. If they do so, they must also
> > provide a super_operations function to return the suitable bdi_writeback
> > struct from any given inode.
> 
> Please drop this for now.  It adds a lot of unused and untestede code
> including a dead on arrival inode operation.

OK, will drop the multi thread support, I'll retain the worker items
though.

> Once we are going to add actual multiple flusher threads we can revise
> it.  But I don't think for example that the operation in it's current
> form makese too much sense - the most logical way to add multiple
> flushers per filesystems would be having multiple bdis of some sort.

Sure, it was more of a proof-of-concept, since I think it'll be
important at higher buffered output rates with a single thread becoming
a bottle neck. But I have no issues with dropping it for now, it'll be
easy enough to re-introduce.

I'll post an updated patch series later tonight/tomorrow with the
changes.

-- 
Jens Axboe

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