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Date:	Mon, 10 Nov 2014 07:31:47 -0800
From:	"Paul E. McKenney" <>
To:	Viresh Kumar <>
Cc:	Christoph Lameter <>,
	Thomas Gleixner <>,
	Frederic Weisbecker <>,
	Linux Kernel Mailing List <>,
	Gilad Ben-Yossef <>,
	Tejun Heo <>,
	John Stultz <>,
	Mike Frysinger <>,
	Minchan Kim <>,
	Hakan Akkan <>,
	Max Krasnyansky <>,
	Hugh Dickins <>,
	"H. Peter Anvin" <>, Ingo Molnar <>,
	Peter Zijlstra <>
Subject: Re: [NOHZ] Remove scheduler_tick_max_deferment

On Mon, Nov 10, 2014 at 12:41:38PM +0530, Viresh Kumar wrote:
> On 6 November 2014 22:54, Christoph Lameter <> 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:

Would it make sense for unlimited max deferment to be available as
a boot parameter?  That would allow people who want tick-free execution
more than accurate stats to get that easily, while keeping stats accurate
for everyone else.

							Thanx, Paul

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