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cgroup: reset css on destruction

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An associated css can be around for quite a while after a cgroup
directory has been removed. In general, it makes sense to reset it to
defaults so as not to worry about any remnants. For instance, memory
cgroup needs to reset memory.low, otherwise pages charged to a dead
cgroup might never get reclaimed. There's ->css_reset callback, which
would fit perfectly for the purpose. Currently, it's only called when a
subsystem is disabled in the unified hierarchy and there are other
subsystems dependant on it. Let's call it on css destruction as well.

Suggested-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Vladimir Davydov 2016-03-01 19:56:30 +03:00 committed by Tejun Heo
parent 63253ad814
commit fa06235b8e
1 changed files with 3 additions and 0 deletions
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3
kernel/cgroup.c
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@ -4787,6 +4787,9 @@ static void offline_css(struct cgroup_subsys_state *css)
if (!(css->flags & CSS_ONLINE))
return;
if (ss->css_reset)
ss->css_reset(css);
if (ss->css_offline)
ss->css_offline(css);