linux-kernel - Re: [PATCH 5/8] blkcg: make sure blkg_lookup() returns %NULL if @q is bypassing

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Message-ID: <20120413172841.GC12233@google.com>
Date:	Fri, 13 Apr 2012 10:28:41 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	axboe@...nel.dk, ctalbott@...gle.com, rni@...gle.com,
	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	containers@...ts.linux-foundation.org
Subject: Re: [PATCH 5/8] blkcg: make sure blkg_lookup() returns %NULL if @q
 is bypassing

On Fri, Apr 13, 2012 at 01:23:36PM -0400, Vivek Goyal wrote:
> I think now synchronize_rcu() has become part of cfq_init_queue()
> effectively and that will slow down boot. In the past I had to remove
> it.

Eh... crap.  You're right.  Forgot about that.  Maybe we need to
special case initial queue setup.  I'll look into it.

Thanks.

-- 
tejun
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