Hello, KAME. On Thu, Jun 28, 2012 at 1:33 AM, Kamezawa Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> wrote: >> Ooh, once memcg drops the __DEPRECATED_clear_css_refs, cgroup_rmdir() >> will mark the cgroup dead before start calling pre_destroy() and none >> of the above will happen. >> > > Hm, threads which touches memcg should hold memcg's reference count rather > than css. > Right ? IIUC, one of reason is a reference from kswapd etc...hm. I'll check > it. Not sure I'm following. I meant that css_tryget() will always fail once pre_destroy() calls being for the cgroup, so no new child or reference can be created for it after that point. Thanks. -- tejun -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>