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

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Message-ID: <CABeCy1bng31kBhDT+=xumez0hjsXVi2V2ysqtDgUH=Y+3JRpuA@mail.gmail.com>
Date:	Fri, 23 Sep 2011 16:47:51 -0700
From:	Venki Pallipadi <venki@...gle.com>
To:	Peter Zijlstra <peterz@...radead.org>
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, Sep 23, 2011 at 1:03 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> On Fri, 2011-09-23 at 11:54 -0700, Venkatesh Pallipadi wrote:
>> Comments?
>
> Looks to be a possible IRQ latency issue as well, that can be a lot of
> timers to run..
>

We could add some rate limit on how many timers we service this way
and/or interrupt/disable-enable in the inner loop.
But, this would be a problem with current hrtimer as well. When
sched_tick timer is not around, we may end up servicing lot of timers
depending on number of them and slack. No?
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