Commit fa06235b authored by Vladimir Davydov's avatar Vladimir Davydov Committed by Tejun Heo

cgroup: reset css on destruction

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: default avatarJohannes Weiner <>
Signed-off-by: default avatarVladimir Davydov <>
Signed-off-by: default avatarTejun Heo <>
parent 63253ad8
......@@ -4787,6 +4787,9 @@ static void offline_css(struct cgroup_subsys_state *css)
if (!(css->flags & CSS_ONLINE))
if (ss->css_reset)
if (ss->css_offline)
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