From: Michal Hocko <mhocko@kernel.org>
To: Kirill Tkhai <ktkhai@virtuozzo.com>
Cc: akpm@linux-foundation.org, hannes@cmpxchg.org,
vdavydov.dev@gmail.com, cgroups@vger.kernel.org,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] memcg: Remove memcg_cgroup::id from IDR on mem_cgroup_css_alloc() failure
Date: Fri, 13 Apr 2018 10:55:53 +0200 [thread overview]
Message-ID: <20180413085553.GF17484@dhcp22.suse.cz> (raw)
In-Reply-To: <152354470916.22460.14397070748001974638.stgit@localhost.localdomain>
On Thu 12-04-18 17:52:04, Kirill Tkhai wrote:
[...]
> @@ -4471,6 +4477,7 @@ mem_cgroup_css_alloc(struct cgroup_subsys_state *parent_css)
>
> return &memcg->css;
> fail:
> + mem_cgroup_id_remove(memcg);
> mem_cgroup_free(memcg);
> return ERR_PTR(-ENOMEM);
> }
The only path which jumps to fail: here (in the current mmotm tree) is
error = memcg_online_kmem(memcg);
if (error)
goto fail;
AFAICS and the only failure path in memcg_online_kmem
memcg_id = memcg_alloc_cache_id();
if (memcg_id < 0)
return memcg_id;
I am not entirely clear on memcg_alloc_cache_id but it seems we do clean
up properly. Or am I missing something?
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2018-04-13 8:55 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-12 14:52 Kirill Tkhai
2018-04-13 8:55 ` Michal Hocko [this message]
2018-04-13 9:35 ` Kirill Tkhai
2018-04-13 11:02 ` Michal Hocko
2018-04-13 11:06 ` Kirill Tkhai
2018-04-13 11:20 ` Michal Hocko
2018-04-13 11:29 ` Kirill Tkhai
2018-04-13 11:38 ` Michal Hocko
2018-04-13 11:49 ` Kirill Tkhai
2018-04-13 11:54 ` Michal Hocko
2018-04-13 12:07 ` Kirill Tkhai
2018-04-13 12:14 ` Michal Hocko
2018-04-13 12:51 ` Michal Hocko
2018-07-26 23:25 ` Andrew Morton
2018-07-27 19:31 ` Johannes Weiner
2018-07-29 19:26 ` Vladimir Davydov
2018-07-30 15:31 ` Johannes Weiner
2018-07-31 23:39 ` Andrew Morton
2018-08-01 15:55 ` Johannes Weiner
2018-08-01 16:22 ` Vladimir Davydov
2018-08-02 8:03 ` Kirill Tkhai
2018-08-02 8:13 ` [PATCH] memcg: Add comment to mem_cgroup_css_online() Kirill Tkhai
2018-08-01 16:16 ` [PATCH] memcg: Remove memcg_cgroup::id from IDR on mem_cgroup_css_alloc() failure Vladimir Davydov
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