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Re: [RFC PATCH 12/12] housekeeping: Reimplement isolcpus on housekeeping

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On Wed, Aug 23, 2017 at 09:55:51AM -0500, Christopher Lameter wrote:
> On Wed, 23 Aug 2017, Frederic Weisbecker wrote:
> 
> > While at it, this is a proposition for a reimplementation of isolcpus=
> > that doesn't involve  scheduler domain isolation. Therefore this
> > brings a behaviour change: all user tasks inherit init/1 affinity which
> > avoid the isolcpus= range. But if a task later overrides its affinity
> > which turns out to intersect an isolated CPU, load balancing may occur
> > on it.
> 
> I think that change is good maybe even a bugfix. I had some people be very
> surprised when they set affinities to multiple cpus and the processeds
> kept sticking to one cpu because of isolcpus.

That's good to hear! I'll keep that direction then, unless someone complains.

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[RFC 00/12] Introduce housekeeping subsystem v2 Frederic Weisbecker <fweisbec@gmail.com> - 2017-08-23 04:00 +0200
  [RFC PATCH 11/12] housekeeping: Handle nohz_full= parameter Frederic Weisbecker <fweisbec@gmail.com> - 2017-08-23 04:00 +0200
  [RFC PATCH 08/12] housekeeping: Introduce housekeeping flags Frederic Weisbecker <fweisbec@gmail.com> - 2017-08-23 04:00 +0200
  [RFC PATCH 02/12] watchdog: Use housekeeping_cpumask() instead of ad-hoc version Frederic Weisbecker <fweisbec@gmail.com> - 2017-08-23 04:00 +0200
  [RFC PATCH 04/12] housekeeping: Make housekeeping cpumask private Frederic Weisbecker <fweisbec@gmail.com> - 2017-08-23 04:00 +0200
  [RFC PATCH 06/12] housekeeping: Rename is_housekeeping_cpu to housekeeping_cpu Frederic Weisbecker <fweisbec@gmail.com> - 2017-08-23 04:00 +0200
  [RFC PATCH 12/12] housekeeping: Reimplement isolcpus on housekeeping Frederic Weisbecker <fweisbec@gmail.com> - 2017-08-23 04:00 +0200
    Re: [RFC PATCH 12/12] housekeeping: Reimplement isolcpus on  housekeeping Christopher Lameter <cl@linux.com> - 2017-08-23 17:00 +0200
      Re: [RFC PATCH 12/12] housekeeping: Reimplement isolcpus on  housekeeping Frederic Weisbecker <fweisbec@gmail.com> - 2017-08-24 15:30 +0200
  [RFC PATCH 07/12] housekeeping: Move it under own config, independant from NO_HZ Frederic Weisbecker <fweisbec@gmail.com> - 2017-08-23 04:00 +0200
  [RFC PATCH 10/12] housekeeping: Affine unbound kthreads Frederic Weisbecker <fweisbec@gmail.com> - 2017-08-23 04:00 +0200

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