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Date: Mon, 10 Nov 2014 12:41:38 +0530
Message-ID: <CAKohpokE8pQUwTuMbnooAd3TsTgmrQWP4RtoJdwhJ5zps+O2zA@mail.gmail.com>
Subject: Re: [NOHZ] Remove scheduler_tick_max_deferment
From: Viresh Kumar <viresh.kumar@linaro.org>
To: Christoph Lameter <cl@linux.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Gilad Ben-Yossef <gilad@benyossef.com>, Tejun Heo <tj@kernel.org>,
        John Stultz <john.stultz@linaro.org>,
        Mike Frysinger <vapier@gentoo.org>,
        Minchan Kim <minchan.kim@gmail.com>,
        Hakan Akkan <hakanakkan@gmail.com>,
        Max Krasnyansky <maxk@qti.qualcomm.com>,
        "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
        Hugh Dickins <hughd@google.com>, "H. Peter Anvin" <hpa@zytor.com>,
        Ingo Molnar <mingo@kernel.org>, Peter Zijlstra <peterz@infradead.org>
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Sender: linux-kernel-owner@vger.kernel.org

On 6 November 2014 22:54, Christoph Lameter <cl@linux.com> wrote:

> We did not need to housekeeper in the dynticks idle case. What is so
> different about dynticks busy?

We do have a running task here and so the stats are important..

> I may not have the complete picture of the timer tick processing in my
> mind these days (it has been a lots of years since I did any work there
> after all) but as far as my arguably simplistic reading of the code goes I
> do not see why a housekeeper would be needed there. The load is constant
> and known in the dynticks busy case as it is in the dynticks idle case.

I tried to initiate a thread on similar stuff, might be helpful:

https://lkml.org/lkml/2014/5/22/131
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