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

On 07/22/2015 04:02 PM, Christoph Lameter wrote:

On Wed, 22 Jul 2015, Paul E. McKenney wrote:

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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