linux-kernel - Re: [PATCH] 4/4 block: explicit plugging

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Message-ID: <20070105072305.GN11203@kernel.dk>
Date:	Fri, 5 Jan 2007 08:23:05 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	linux-kernel@...r.kernel.org, akpm@...l.org,
	Nick Piggin <npiggin@...e.de>,
	Trond Myklebust <trond.myklebust@....uio.no>,
	Neil Brown <neilb@...e.de>,
	Mark Fasheh <mark.fasheh@...cle.com>,
	"Chen, Kenneth W" <kenneth.w.chen@...el.com>
Subject: Re: [PATCH] 4/4 block: explicit plugging

On Thu, Jan 04 2007, Nick Piggin wrote:
> Jens Axboe wrote:
> >Nick writes:
> >
> >This is a patch to perform block device plugging explicitly in the 
> >submitting
> >process context rather than implicitly by the block device.
> 
> Hi Jens,
> 
> Hey thanks for doing so much hard work with this, I couldn't have fixed
> all the block layer stuff myself. QRCU looks like a good solution for the
> barrier/sync operations (/me worried that one wouldn't exist), and a
> novel use of RCU!
> 
> The only thing I had been thinking about before it is ready for primetime
> -- as far as the VM side of things goes -- is whether we should change
> the hard calls to address_space operations, such that they might be
> avoided or customised when there is no backing block device?
> 
> I'm sure the answer to this is "yes", so I have an idea for a simple
> implementation... but I'd like to hear thoughts from network fs / raid
> people?

I suppose that would be the proper thing to do, for non __make_request()
operated backing devices. I'll add the hooks, then we can cook up a raid
implementation if need be.

-- 
Jens Axboe

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