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References: <1464068266-27736-1-git-send-email-roy.qing.li@gmail.com>
	<20160525155122.GK20132@dhcp22.suse.cz>
Date: Thu, 26 May 2016 09:28:13 +0800
Message-ID: <CAJFZqHwYC_BbTNG=5=LYxo+6q6HadEMDkVTcZS1eCqXoD=6HnA@mail.gmail.com>
Subject: Re: [PATCH][V2] mm: memcontrol: fix the margin computation in mem_cgroup_margin
From: Li RongQing <roy.qing.li@gmail.com>
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Sender: owner-linux-mm@kvack.org
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To: Michal Hocko <mhocko@kernel.org>
Cc: cgroups@vger.kernel.org, linux-mm@kvack.org, Johannes Weiner <hannes@cmpxchg.org>, Vladimir Davydov <vdavydov@virtuozzo.com>

On Wed, May 25, 2016 at 11:51 PM, Michal Hocko <mhocko@kernel.org> wrote:
> This is quite hard for me to grasp. What would you say about the
> following:
> "
> mem_cgroup_margin might return memory.limit - memory_count when
> the memsw.limit is in excess. This
> doesn't happen usually because we do not allow excess on hard limits and
> memory.limit <= memsw.limit but __GFP_NOFAIL charges can force the charge
> and cause the excess when no memory is really swapable (swap is full or
> no anonymous memory is left).


Sorry for my poor English, thanks for your description, hope it can be
into the log

-Roy

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