linux-kernel - [RFC PATCH 0/6] cpuset: Allow to modify isolcpus through cpuset

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Message-Id: <20210714135420.69624-1-frederic@kernel.org>
Date:   Wed, 14 Jul 2021 15:54:14 +0200
From:   Frederic Weisbecker <frederic@...nel.org>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Frederic Weisbecker <frederic@...nel.org>,
        Tejun Heo <tj@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Alex Belits <abelits@...vell.com>,
        Nitesh Lal <nilal@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Nicolas Saenz <nsaenzju@...hat.com>,
        Christoph Lameter <cl@...two.de>,
        Marcelo Tosatti <mtosatti@...hat.com>,
        Zefan Li <lizefan.x@...edance.com>, cgroups@...r.kernel.org
Subject: [RFC PATCH 0/6] cpuset: Allow to modify isolcpus through cpuset

The fact that "isolcpus=" behaviour can't be modified at runtime is an
eternal source of discussion and debate opposing a useful feature against
a terrible interface.

I've long since tried to figure out a proper way to control this at
runtime using cpusets, which isn't easy as a boot time single cpumask
is difficult to map to a hierarchy of cpusets that can even overlap.

The idea here is to map the boot-set isolation behaviour to any cpuset
directory whose cpumask is a subset of "isolcpus=". I let you browse
for details on the last patch.

Note this is still WIP and half-baked, but I figured it's important to
validate the interface early.

git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
	cpuset/isolation

HEAD: 6d3dba1115b7ea464febf3763244c783e87c7baf

Thanks,
	Frederic
---

Frederic Weisbecker (6):
      pci: Decouple HK_FLAG_WQ and HK_FLAG_DOMAIN cpumask fetch
      workqueue: Decouple HK_FLAG_WQ and HK_FLAG_DOMAIN cpumask fetch
      net: Decouple HK_FLAG_WQ and HK_FLAG_DOMAIN cpumask fetch
      sched/isolation: Split domain housekeeping mask from the rest
      sched/isolation: Make HK_FLAG_DOMAIN mutable
      cpuset: Add cpuset.isolation_mask file


 drivers/pci/pci-driver.c        |  21 ++++++--
 include/linux/sched/isolation.h |   4 ++
 kernel/cgroup/cpuset.c          | 111 ++++++++++++++++++++++++++++++++++++++--
 kernel/sched/isolation.c        |  73 ++++++++++++++++++++++----
 kernel/workqueue.c              |   4 +-
 net/core/net-sysfs.c            |   6 +--
 6 files changed, 196 insertions(+), 23 deletions(-)