cgroup: factor out css_set_move_task()

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A task is associated and disassociated with its css_set in three
places - during migration, after a new task is created and when a task
exits.  The first is handled by cgroup_task_migrate() and the latter
two are open-coded.

These are similar operations and spreading them over multiple places
makes it harder to follow and update.  This patch collects all task
css_set [dis]association operations into css_set_move_task().

While css_set_move_task() may check whether populated state needs to
be updated when not strictly necessary, the behavior is essentially
equivalent before and after this patch.

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

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This commit is contained in:

Tejun Heo 2015-10-15 16:41:52 -04:00

parent 389b9c1bc9

commit f6d7d049c1

1 changed files with 56 additions and 48 deletions

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kernel/cgroup.c

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