tree 6b8b8ccc4a99cfc7e156765c58ab285034980995
parent 2e91fa7f6d451e3ea9fec999065d2fd199691f9d
author Tejun Heo <tj@kernel.org> 1444941713 -0400
committer Tejun Heo <tj@kernel.org> 1444941713 -0400

cgroup: add cgroup_subsys->free() method and use it to fix pids controller

pids controller is completely broken in that it uncharges when a task
exits allowing zombies to escape resource control.  With the recent
updates, cgroup core now maintains cgroup association till task free
and pids controller can be fixed by uncharging on free instead of
exit.

This patch adds cgroup_subsys->free() method and update pids
controller to use it instead of ->exit() for uncharging.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Aleksa Sarai <cyphar@cyphar.com>