linux-kernel - Re: [PATCH 33/36] block: add io_context->active

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Message-ID: <20120223182046.GF19691@redhat.com>
Date:	Thu, 23 Feb 2012 13:20:46 -0500
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	axboe@...nel.dk, ctalbott@...gle.com, rni@...gle.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 33/36] block: add io_context->active_ref

On Wed, Feb 22, 2012 at 11:13:47AM -0800, Tejun Heo wrote:

[..]
> It indeed is ugly to have ref, active_ref and nr_tasks tho.  If we can
> remove CLONE_IO, nr_tasks will go away with it.  Maybe, I don't know.
> Let's see.

I just remembered following commit where a race was fixed and in this
case two processes were sharing io context.

>From 5eb46851de3904cd1be9192fdacb8d34deadc1fc Mon Sep 17 00:00:00 2001
From: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
Date: Fri, 2 Dec 2011 10:07:07 +0100
Subject: [PATCH 1/1] cfq-iosched: fix cfq_cic_link() race confition

Just thought of mentioning here. It shows somebody out there uses 
and cares about CLONE_IO.

Thanks
Vivek
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