cgroup: suppress spurious de-populated events

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During task migration, tasks may transfer between two css_sets which
are associated with the same cgroup.  If those tasks are the only
tasks in the cgroup, this currently triggers a spurious de-populated
event on the cgroup.

Fix it by bumping up populated count before bumping it down during
migration to ensure that it doesn't reach zero spuriously.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Zefan Li <lizefan@huawei.com>

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This commit is contained in:

Tejun Heo 2016-03-03 09:57:57 -05:00

parent 2378d8b8ba

commit 20b454a61f

1 changed files with 3 additions and 2 deletions

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kernel/cgroup.c

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