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Date: Tue, 2 Apr 2013 18:20:56 +0400 From: Glauber Costa <glommer@...allels.com> To: Michal Hocko <mhocko@...e.cz> CC: Li Zefan <lizefan@...wei.com>, Johannes Weiner <hannes@...xchg.org>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>, LKML <linux-kernel@...r.kernel.org>, Cgroups <cgroups@...r.kernel.org>, <linux-mm@...ck.org> Subject: Re: [PATCH] memcg: don't do cleanup manually if mem_cgroup_css_online() fails On 04/02/2013 06:16 PM, Michal Hocko wrote: > mem_cgroup_css_online > memcg_init_kmem > mem_cgroup_get # refcnt = 2 > memcg_update_all_caches > memcg_update_cache_size # fails with ENOMEM Here is the thing: this one in kmem only happens for kmem enabled memcgs. For those, we tend to do a get once, and put only when the last kmem reference is gone. For non-kmem memcgs, refcnt will be 1 here, and will be balanced out by the mem_cgroup_put() in css_free. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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