linux-kernel - Re: [RFC] Introduce greedy hrtimer walk on idle

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Date:	Wed, 28 Sep 2011 15:25:15 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Venki Pallipadi <venki@...gle.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC] Introduce greedy hrtimer walk on idle

On Fri, 2011-09-23 at 16:41 -0700, Venki Pallipadi wrote:
> On Fri, Sep 23, 2011 at 12:55 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> > On Fri, 2011-09-23 at 11:54 -0700, Venkatesh Pallipadi wrote:
> >> Comments?
> >
> > One of the reasons we didn't do it before was added cost to
> > hrtimer_{add,del}, did you measure workloads that are heavy on  that?
> >
> 
> I haven't seen any measurable overhead with workloads I have tried.
> But, I don't think I have hit that path hard enough. Do you have any
> particular workload in mind?

Not really, I asked tglx if he knew a particular workload to test this,
but he didn't have anything either.


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