cgroup: make css_sets pin the associated cgroups

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Currently, css_sets don't pin the associated cgroups.  This is okay as
a cgroup with css_sets associated are not allowed to be removed;
however, to help resource tracking for zombie tasks, this is scheduled
to change such that a cgroup can be removed even when it has css_sets
associated as long as none of them are populated.

To ensure that a cgroup doesn't go away while css_sets are still
associated with it, make each associated css_set hold a reference on
the cgroup if non-root.

v2: Root cgroups are special and shouldn't be ref'd by css_sets.

Signed-off-by: Tejun Heo <tj@kernel.org>

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This commit is contained in:

Tejun Heo 2015-10-15 16:41:51 -04:00

parent 052c3f3a0b

commit 2ceb231b0a

1 changed files with 6 additions and 4 deletions

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kernel/cgroup.c

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