linux-kernel - Re: [PATCH 2/2] block: Avoid deadlocks with bio allocation by stacking drivers

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Message-ID: <20120911184553.GT7677@google.com>
Date:	Tue, 11 Sep 2012 11:45:53 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Muthu Kumar <muthu.lkml@...il.com>
Cc:	Kent Overstreet <koverstreet@...gle.com>,
	linux-bcache@...r.kernel.org, linux-kernel@...r.kernel.org,
	dm-devel@...hat.com, axboe@...nel.dk,
	Vivek Goyal <vgoyal@...hat.com>,
	Mikulas Patocka <mpatocka@...hat.com>, bharrosh@...asas.com,
	david@...morbit.com
Subject: Re: [PATCH 2/2] block: Avoid deadlocks with bio allocation by
 stacking drivers

Hello,

On Tue, Sep 11, 2012 at 11:36:28AM -0700, Muthu Kumar wrote:
> Does this preserve the CPU from which the bio was submitted
> originally. Not familiar with cmwq, may be Tejun can clarify.
> 
> Tejun - the question is, do we honor the rq_affinity with the above
> rescue worker implementation?

The work item would run from the same CPU but there isn't any
mechanism to keep track of the issuing CPU if there are multiple bios
to be rescued.  Isn't rq_affinity an optimization hint?  If so, I
don't think it matters here.

Thanks.

-- 
tejun
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