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

From	Christopher Lameter <cl@linux.com>
Newsgroups	linux.kernel
Subject	Re: [RFC PATCH 12/12] housekeeping: Reimplement isolcpus on housekeeping
Date	2017-08-23 17:00 +0200
Message-ID	<uhFip-1PN-5@gated-at.bofh.it> (permalink)
References	<uht7z-2oU-3@gated-at.bofh.it> <uht7A-2oU-37@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

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.

Thread

[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

csiph-web