linux-kernel - Re: [PATCH 33/33] blk-throttle: implement proper hierarchy support

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Message-ID: <20130507161412.GA4948@mtj.dyndns.org>
Date:	Tue, 7 May 2013 09:14:12 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	axboe@...nel.dk, linux-kernel@...r.kernel.org, lizefan@...wei.com,
	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org
Subject: Re: [PATCH 33/33] blk-throttle: implement proper hierarchy support

Hello, Vivek.

On Tue, May 07, 2013 at 09:55:11AM -0400, Vivek Goyal wrote:
> So if somebody does not specify __DEVEL_sane_behavior, hierarchy is
> still broken. Should we continue to display the message in that case?

The message is to warn people of possible behavior changes.  For
blk-throttle, the behaviors are settled now.  Whetner sane_behavior or
not, the hierarchy behaviors aren't gonna change anymore.  The
hindsight is 20/20 and it would probably have been better if we had
done the same for cfq but I was thinking that we could probably do
away with interface versioning at the time.  Ah well... it isn't
optimal but that's what we ended up with.

Thanks.

-- 
tejun
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