From: Glauber Costa <glommer@parallels.com>
To: Michal Hocko <mhocko@suse.cz>
Cc: Li Zefan <lizefan@huawei.com>,
Johannes Weiner <hannes@cmpxchg.org>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
LKML <linux-kernel@vger.kernel.org>,
Cgroups <cgroups@vger.kernel.org>,
linux-mm@kvack.org
Subject: Re: [PATCH] memcg: don't do cleanup manually if mem_cgroup_css_online() fails
Date: Tue, 2 Apr 2013 18:20:56 +0400 [thread overview]
Message-ID: <515AE948.1000704@parallels.com> (raw)
In-Reply-To: <20130402141646.GQ24345@dhcp22.suse.cz>
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.
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next prev parent reply other threads:[~2013-04-02 14:20 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-02 7:35 Li Zefan
2013-04-02 8:03 ` Li Zefan
2013-04-02 8:07 ` Glauber Costa
2013-04-02 8:34 ` Li Zefan
2013-04-02 8:42 ` Glauber Costa
2013-04-02 8:43 ` Glauber Costa
2013-04-02 12:16 ` Michal Hocko
2013-04-02 12:22 ` Glauber Costa
2013-04-02 13:32 ` Michal Hocko
2013-04-02 13:36 ` Glauber Costa
2013-04-03 3:43 ` Li Zefan
2013-04-02 14:16 ` Michal Hocko
2013-04-02 14:20 ` Glauber Costa [this message]
2013-04-02 14:28 ` Michal Hocko
2013-04-02 14:33 ` Glauber Costa
2013-04-02 15:04 ` [PATCH -v2] " Michal Hocko
2013-04-03 3:49 ` Li Zefan
2013-04-03 7:43 ` Michal Hocko
2013-04-03 7:49 ` Li Zefan
2013-04-03 8:18 ` Michal Hocko
2013-04-03 8:30 ` Glauber Costa
2013-04-03 8:37 ` Li Zefan
2013-04-03 8:50 ` Michal Hocko
2013-04-03 8:53 ` [PATCH 1/2] Revert "memcg: avoid dangling reference count in creation failure." Michal Hocko
2013-04-03 8:53 ` [PATCH 2/2] memcg, kmem: clean up reference count handling on the error path Michal Hocko
2013-04-03 9:48 ` Michal Hocko
2013-04-03 8:08 ` [PATCH -v2] memcg: don't do cleanup manually if mem_cgroup_css_online() fails Glauber Costa
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