linux-kernel - Re: [PATCH 06/51] memcg: add mem_cgroup_root

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Message-ID: <20150618174930.GA12934@mtj.duckdns.org>
Date:	Thu, 18 Jun 2015 13:49:30 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	axboe@...nel.dk, linux-kernel@...r.kernel.org, jack@...e.cz,
	hch@...radead.org, hannes@...xchg.org,
	linux-fsdevel@...r.kernel.org, vgoyal@...hat.com,
	lizefan@...wei.com, cgroups@...r.kernel.org, linux-mm@...ck.org,
	clm@...com, fengguang.wu@...el.com, david@...morbit.com,
	gthelen@...gle.com, khlebnikov@...dex-team.ru
Subject: Re: [PATCH 06/51] memcg: add mem_cgroup_root_css

Hello, Michal.

On Thu, Jun 18, 2015 at 01:12:27PM +0200, Michal Hocko wrote:
...
> I see and yes, it makes some sense. I just think we can get rid of the
> accessor functions when the struct mem_cgroup is visible and the code
> can simply do &{page->}mem_cgroup->css.

As long as the accessors are inline, I think it should be fine.

> I have tried to compile with !CONFIG_MEMCG and !CONFIG_CGROUP_WRITEBACK
> without mem_cgroup_root_css defined for this configuration and
> mm/backing-dev.c compiles just fine. So maybe we should get rid of it
> rather than have a potentially tricky code?

Yeah, please feel free to queue a patch to remove it if doesn't break
anything.

Thanks.

-- 
tejun
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