linux-kernel - Re: [PATCH v2] make dm and dm-crypt forward cgroup context (was: dm-crypt parallelization patches)

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Date:	Thu, 11 Apr 2013 13:00:05 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Mikulas Patocka <mpatocka@...hat.com>
Cc:	Vivek Goyal <vgoyal@...hat.com>, Jens Axboe <axboe@...nel.dk>,
	Mike Snitzer <snitzer@...hat.com>,
	Milan Broz <gmazyland@...il.com>, dm-devel@...hat.com,
	Andi Kleen <andi@...stfloor.org>, dm-crypt@...ut.de,
	linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	Christian Schmidt <schmidt@...add.de>,
	"Alasdair G. Kergon" <agk@...hat.com>
Subject: Re: [PATCH v2] make dm and dm-crypt forward cgroup context (was:
 dm-crypt parallelization patches)

On Thu, Apr 11, 2013 at 12:52:03PM -0700, Tejun Heo wrote:
> If this becomes an actual bottleneck, the right thing to do is making
> css ref per-cpu.  Please stop messing around with refcounting.

If you think this kind of hackery is acceptable, you really need to
re-evaluate your priorities in making engineering decisions.  In
tightly coupled code, maybe, but you're trying to introduce utterly
broken error-prone thing as a generic block layer API.  I mean, are
you for real?

-- 
tejun
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