linux-kernel - Re: [patch 00/16] CFS Bandwidth Control v7

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Date:	Thu, 23 Jun 2011 14:06:56 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
Cc:	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>,
	Ingo Molnar <mingo@...e.hu>, Pavel Emelyanov <xemul@...nvz.org>
Subject: Re: [patch 00/16] CFS Bandwidth Control v7

On Wed, 2011-06-22 at 19:05 +0900, Hidetoshi Seto wrote:
> I'll continue my test/benchmark on this v7 for a while.
> Though I believe no more bug is there, I'll let you know if there is
> something.

Would that testing include performance of a kernel without these patches
vs one with these patches in a configuration where the new feature is
compiled in but not used?

It does add a number of if (!cfs_rq->runtime_enabled) return branches
all over the place, some possibly inside a function call (depending on
what the auto-inliner does). So while the impact should be minimal, it
would be very good to test it is indeed so.


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