linux-kernel - Re: [patch 00/17] CFS Bandwidth Control v7.1

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Date:	Thu, 07 Jul 2011 19:20:20 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Jason Baron <jbaron@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Paul Turner <pjt@...gle.com>,
	linux-kernel@...r.kernel.org,
	Bharata B Rao <bharata@...ux.vnet.ibm.com>,
	Dhaval Giani <dhaval.giani@...il.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Hu Tao <hutao@...fujitsu.com>
Subject: Re: [patch 00/17] CFS Bandwidth Control v7.1

On Thu, 2011-07-07 at 12:23 -0400, Jason Baron wrote:

> yes, this is the type of case jump labels is designed for. Let me know
> if there are any usage questions/concerns.

Unrelated to this change, I was looking at a case where it would be nice
to have a way to specify the initial state of jump labels.

That is, currently:

jump_label_key foo;

  if (static_branch(&foo))

will default to false, until jump_label_inc(&foo) etc..

I was looking to add something like:

jump_label_key foo = JUMP_LABEL_TRUE;

Which would initialize the thing to be true, the problem with that is
that it takes until the loop in jump_label_init() before that takes
effect, which was too late in my particular case.

Anyway, not the current problem and probably not your problem anyway,
but I wanted to throw the issue out there.
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