linux-kernel - Re: [PATCH v3.4-rc5] block: iocontext->nr

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Message-ID: <x49sjfjloty.fsf@segfault.boston.devel.redhat.com>
Date:	Tue, 01 May 2012 14:48:41 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Jens Axboe <jaxboe@...ionio.com>, Tejun Heo <tj@...nel.org>,
	Dave Jones <davej@...hat.com>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	Sasha Levin <levinsasha928@...il.com>
Subject: Re: [PATCH v3.4-rc5] block: iocontext->nr_tasks should be initialized to one

Vivek Goyal <vgoyal@...hat.com> writes:

> On Tue, May 01, 2012 at 02:31:07PM -0400, Jeff Moyer wrote:
>
> [..]
>> > But as to actual users, I really don't know. I agree it's probably not
>> > that widely used. If google still had that code search, we could get a
>> > better idea :-)
>> 
>> I know of one project: the venerable dump/restore utility uses CLONE_IO.
>
> I thought you wrote cooperating queue logic to fix dump as it was not
> using CLONE_IO and IO from multiple threads was going in separate 
> queues.

That's correct.  I believe I sent the patch for dump before the kernel
patch was accepted.  Plus, it can't hurt, right?

Cheers,
Jeff
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