linux-kernel - Re: [RFT PATCH] blkio: alloc per cpu data from worker thread context( Re: kvm deadlock)

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Message-ID: <20111219225635.GC6256@google.com>
Date:	Mon, 19 Dec 2011 14:56:35 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Nate Custer <nate@...nel.net>, Jens Axboe <axboe@...nel.dk>,
	Avi Kivity <avi@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>, kvm@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [RFT PATCH] blkio: alloc per cpu data from worker thread
 context( Re: kvm deadlock)

Hello, Vivek.

On Mon, Dec 19, 2011 at 01:27:17PM -0500, Vivek Goyal wrote:
> Ok, that's good to know. If per cpu allocator can support this use case,
> it will be good for 3.3 onwards. This seems to be right way to go to fix
> the problem.

Ummm... if we're gonna make percpu usable w/ GFP_NOIO, the right
interim solution would be making a simplistic mempool so that later
when percpu can do it, it can be swapped easily.  I really can't see
much benefit of adding refcnting on top of everything just for this.

Thanks.

-- 
tejun
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