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From: Michal Hocko <mhocko@kernel.org>
To: Vladimir Davydov <vdavydov@virtuozzo.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>,
	David Rientjes <rientjes@google.com>,
	Johannes Weiner <hannes@cmpxchg.org>,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] mm: oom: deduplicate victim selection code for memcg and global oom
Date: Fri, 27 May 2016 16:26:26 +0200	[thread overview]
Message-ID: <20160527142626.GQ27686@dhcp22.suse.cz> (raw)
In-Reply-To: <3bbc7b70dae6ace0b8751e0140e878acfdfffd74.1464358556.git.vdavydov@virtuozzo.com>

On Fri 27-05-16 17:17:42, Vladimir Davydov wrote:
> When selecting an oom victim, we use the same heuristic for both memory
> cgroup and global oom. The only difference is the scope of tasks to
> select the victim from. So we could just export an iterator over all
> memcg tasks and keep all oom related logic in oom_kill.c, but instead we
> duplicate pieces of it in memcontrol.c reusing some initially private
> functions of oom_kill.c in order to not duplicate all of it. That looks
> ugly and error prone, because any modification of select_bad_process
> should also be propagated to mem_cgroup_out_of_memory.
> 
> Let's rework this as follows: keep all oom heuristic related code
> private to oom_kill.c and make oom_kill.c use exported memcg functions
> when it's really necessary (like in case of iterating over memcg tasks).

I am doing quite large changes in this area and this would cause many
conflicts. Do you think you can postpone this after my patchset [1] gets
sorted out please?

I haven't looked at the patch carefully so I cannot tell much about it
right now but just wanted to give a heads up for the conflicts.

[1] http://lkml.kernel.org/r/1464266415-15558-1-git-send-email-mhocko@kernel.org

Thanks!

> 
> Signed-off-by: Vladimir Davydov <vdavydov@virtuozzo.com>
> ---
>  include/linux/memcontrol.h |  15 ++++
>  include/linux/oom.h        |  51 -------------
>  mm/memcontrol.c            | 112 ++++++++++-----------------
>  mm/oom_kill.c              | 183 +++++++++++++++++++++++++++++----------------
>  4 files changed, 176 insertions(+), 185 deletions(-)
-- 
Michal Hocko
SUSE Labs

  reply	other threads:[~2016-05-27 14:26 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-05-27 14:17 [PATCH 1/2] mm: oom: add memcg to oom_control Vladimir Davydov
2016-05-27 14:17 ` [PATCH 2/2] mm: oom: deduplicate victim selection code for memcg and global oom Vladimir Davydov
2016-05-27 14:26   ` Michal Hocko [this message]
2016-05-27 14:45     ` Vladimir Davydov
2016-05-27 14:52       ` Michal Hocko
2016-05-27 17:23   ` Johannes Weiner
2016-06-08  8:33   ` Michal Hocko
2016-06-08 11:18     ` Tetsuo Handa
2016-06-08 11:24       ` Tetsuo Handa
2016-06-08 14:21       ` Michal Hocko
2016-06-08 13:52     ` Vladimir Davydov
2016-06-08 14:46       ` Michal Hocko
2016-05-27 14:34 ` [PATCH 1/2] mm: oom: add memcg to oom_control Michal Hocko
2016-05-27 17:20 ` Johannes Weiner

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