Re: [PATCH v4 1/5] nohz_full: add support for "cpu_isolated" mode

[Chris Metcalf]

On 07/22/2015 04:02 PM, Christoph Lameter wrote:
> On Wed, 22 Jul 2015, Paul E. McKenney wrote:
>
> > > > Didn't Christoph Lameter fix this?  Or is this an additional problem?
> > > Well the vmstat update must realize first that there are no outstanding
> > > updates before switching itself off. So typically there is one extra tick.
> > > But we could add another function that will simply fold the differential
> > > immediately and turn the kworker task in the expectation that the
> > > processor will stay quiet.
> > Got it, thank you!
> >
> > 								Thanx, Paul
> Ok here is a function that quiets down the vmstat kworkers.

That's great - I will include this patch in my series then, and call it
as part of the "hard isolation" mode return to userspace.  Thanks!

--
Chris Metcalf, EZChip Semiconductor
http://www.ezchip.com

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