linux-kernel - Re: [patch 0/3] mm: memcontrol: eliminate charge reparenting

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Message-ID: <20141008124823.GA4592@dhcp22.suse.cz>
Date:	Wed, 8 Oct 2014 14:48:23 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	linux-mm@...ck.org, Vladimir Davydov <vdavydov@...allels.com>,
	Greg Thelen <gthelen@...gle.com>, Tejun Heo <tj@...nel.org>,
	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 0/3] mm: memcontrol: eliminate charge reparenting

On Sat 20-09-14 16:00:32, Johannes Weiner wrote:
> Hi,
> 
> we've come a looong way when it comes to the basic cgroups model, and
> the recent changes there open up a lot of opportunity to make drastic
> simplifications to memory cgroups as well.
> 
> The decoupling of css from the user-visible cgroup, word-sized per-cpu
> css reference counters, and css iterators that include offlined groups
> means we can take per-charge css references, continue to reclaim from
> offlined groups, and so get rid of the error-prone charge reparenting.
> 
> Combined with the higher-order reclaim fixes, lockless page counters,
> and memcg iterator simplification I sent on Friday, the memory cgroup
> core code is finally no longer the biggest file in mm/.  Yay!

Yeah, the code reduction (as per the diffstat - I didn't get to the code
yet) seems really promising.

> These patches are based on mmotm + the above-mentioned changes

> + Tj's percpu-refcount conversion to atomic_long_t.

This is https://lkml.org/lkml/2014/9/20/11 right?

> Thanks!
> 
>  include/linux/cgroup.h          |  26 +++
>  include/linux/percpu-refcount.h |  43 ++++-
>  mm/memcontrol.c                 | 337 ++------------------------------------
>  3 files changed, 75 insertions(+), 331 deletions(-)
> 

-- 
Michal Hocko
SUSE Labs
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