linux-kernel - Re: [PATCH v7 9/9] block: Avoid deadlocks with bio allocation by stacking drivers

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Message-ID: <20120904210342.GA8724@dhcp-172-17-108-109.mtv.corp.google.com>
Date:	Tue, 4 Sep 2012 14:03:42 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Kent Overstreet <koverstreet@...gle.com>
Cc:	Mikulas Patocka <mpatocka@...hat.com>,
	Vivek Goyal <vgoyal@...hat.com>, linux-bcache@...r.kernel.org,
	linux-kernel@...r.kernel.org, dm-devel@...hat.com,
	bharrosh@...asas.com, Jens Axboe <axboe@...nel.dk>
Subject: Re: [PATCH v7 9/9] block: Avoid deadlocks with bio allocation by
 stacking drivers

Hello,

On Tue, Sep 04, 2012 at 12:42:37PM -0700, Kent Overstreet wrote:
> You want to point me at the relevant workqueue code? I'd really like to
> see what you did there, it's entirely possible you're aware of some
> issue I'm not but if not I'd like to take a stab at it.

I was mistaken.  The issue was that adding @gfp_flags to
kthread_create() wasn't trivial involving updates to arch callbacks,
so the timer was added to side-step the issue.  So, yeah, if it can be
made to work w/o timer, I think that would be better.

Thanks.

-- 
tejun
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