Re: [PATCH v3 2/9] cgroup/cpuset: Fix a partition bug with hotplug
From: Tejun Heo <hidden>
Date: 2021-07-26 23:00:06
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On Tue, Jul 20, 2021 at 10:18:27AM -0400, Waiman Long wrote:
In cpuset_hotplug_workfn(), the detection of whether the cpu list
has been changed is done by comparing the effective cpus of the top
cpuset with the cpu_active_mask. However, in the rare case that just
all the CPUs in the subparts_cpus are offlined, the detection fails
and the partition states are not updated correctly. Fix it by forcing
the cpus_updated flag to true in this particular case.
Fixes: 4b842da276a8 ("cpuset: Make CPU hotplug work with partition")
Signed-off-by: Waiman Long <redacted>Applied to cgroup/for-5.15 w/ a minor update to the comment (I dropped "just" before "all". It read weird to me.) Thanks. -- tejun