linux-kernel - Re: [patch 5/9] mm: memcontrol: use root_mem_cgroup res

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Date:	Wed, 7 May 2014 17:14:08 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	linux-mm@...ck.org, Hugh Dickins <hughd@...gle.com>,
	Tejun Heo <tj@...nel.org>, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 5/9] mm: memcontrol: use root_mem_cgroup res_counter

On Wed 30-04-14 16:25:39, Johannes Weiner wrote:
> The root_mem_cgroup res_counter is never charged itself: there is no
> limit at the root level anyway, and any statistics are generated on
> demand by summing up the counters of all other cgroups.  This was an
> optimization to keep down costs on systems that don't create specific
> cgroups, but with per-cpu charge caches the res_counter operations do
> not even show up on in profiles anymore.  Just remove it and simplify
> the code.

It seems that only kmem and tcp thingy are left but those looks much
harder and they are not directly related.

root_mem_cgroup use also seems to be correct.

I have to look at this closer and that will be no sooner than on Monday
as I am off for the rest of the week.
[...]
-- 
Michal Hocko
SUSE Labs
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