linux-kernel - [PATCH 0/2] cgroup/cpuset: Make hotplug code more efficient

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Date:   Wed,  1 Feb 2023 22:17:47 -0500
From:   Waiman Long <longman@...hat.com>
To:     Tejun Heo <tj@...nel.org>, Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Will Deacon <will@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
        kernel-team@...roid.com, Waiman Long <longman@...hat.com>
Subject: [PATCH 0/2] cgroup/cpuset: Make hotplug code more efficient

This small patch series makes the cpuset hotplug a bit more efficient
by eliminating unnecessary task iteration and cpu/node masks update
when an hotplug event (online/offline) happens.

These patches can also avoid the known problem of missing a previously
gone offline cpu in v1 cpuset after a single cpu offline and online
sequence.

Waiman Long (2):
  cgroup/cpuset: Skip task update if hotplug doesn't affect current
    cpuset
  cgroup/cpuset: Don't update tasks' cpumasks for cpu offline events

 kernel/cgroup/cpuset.c | 31 +++++++++++++++++++++++--------
 1 file changed, 23 insertions(+), 8 deletions(-)

-- 
2.31.1