memory cgroup enhancements: implicit force_empty() at rmdir
Add pre_destroy handler for mem_cgroup and try to make mem_cgroup empty at rmdir(). Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Balbir Singh <balbir@linux.vnet.ibm.com> Cc: David Rientjes <rientjes@google.com> Cc: Herbert Poetzl <herbert@13thfloor.at> Cc: Kirill Korotaev <dev@sw.ru> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: Paul Menage <menage@google.com> Cc: Pavel Emelianov <xemul@openvz.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -895,6 +895,13 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
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return &mem->css;
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}
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static void mem_cgroup_pre_destroy(struct cgroup_subsys *ss,
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struct cgroup *cont)
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{
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struct mem_cgroup *mem = mem_cgroup_from_cont(cont);
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mem_cgroup_force_empty(mem);
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}
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static void mem_cgroup_destroy(struct cgroup_subsys *ss,
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struct cgroup *cont)
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{
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@ -946,6 +953,7 @@ struct cgroup_subsys mem_cgroup_subsys = {
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.name = "memory",
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.subsys_id = mem_cgroup_subsys_id,
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.create = mem_cgroup_create,
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.pre_destroy = mem_cgroup_pre_destroy,
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.destroy = mem_cgroup_destroy,
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.populate = mem_cgroup_populate,
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.attach = mem_cgroup_move_task,
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