linux-kernel - Re: [PATCH 2/7] sched: Update rq clock on nohz CPU before setting fair group shares

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Message-ID: <20130410115056.GA30852@gmail.com>
Date:	Wed, 10 Apr 2013 13:50:56 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Alessio Igor Bogani <abogani@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Chris Metcalf <cmetcalf@...era.com>,
	Christoph Lameter <cl@...ux.com>,
	Geoff Levand <geoff@...radead.org>,
	Gilad Ben Yossef <gilad@...yossef.com>,
	Hakan Akkan <hakanakkan@...il.com>,
	Li Zhong <zhong@...ux.vnet.ibm.com>,
	Namhyung Kim <namhyung.kim@....com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Paul Turner <pjt@...gle.com>, Mike Galbraith <efault@....de>
Subject: Re: [PATCH 2/7] sched: Update rq clock on nohz CPU before setting
 fair group shares


* Peter Zijlstra <peterz@...radead.org> wrote:

> On Wed, 2013-04-10 at 13:06 +0200, Ingo Molnar wrote:
> 
> > There's just a handful of high level entry points, right? schedule(), wakeup, 
> > scheduler tick, maybe notifiers - anything else? 
> 
> I suppose there's some cgroup muck and the various system calls; most
> of them should be covered if we take some lower level primitives or so.
> 
> We could 'simply' hijack rq->lock and clear the state every time we
> acquire or release it.. maybe have an exemption for the balance double
> lock ops.

That would be feasible ...

Thanks,

	Ingo
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