linux-kernel - Re: [PATCH v2 11/51] memcg: implement mem_cgroup_css_from

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Message-ID: <20150527174817.GP7099@htj.duckdns.org>
Date:	Wed, 27 May 2015 13:48:17 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	axboe@...nel.dk, linux-kernel@...r.kernel.org, jack@...e.cz,
	hch@...radead.org, linux-fsdevel@...r.kernel.org,
	vgoyal@...hat.com, lizefan@...wei.com, cgroups@...r.kernel.org,
	linux-mm@...ck.org, mhocko@...e.cz, clm@...com,
	fengguang.wu@...el.com, david@...morbit.com, gthelen@...gle.com,
	khlebnikov@...dex-team.ru
Subject: Re: [PATCH v2 11/51] memcg: implement mem_cgroup_css_from_page()

Hello,

On Wed, May 27, 2015 at 01:09:55PM -0400, Johannes Weiner wrote:
> Regular page migration uses mem_cgroup_migrate() as well, but it's not
> a problem as it ensures that the old page doesn't have any outstanding
> references at that point.

Ooh, I see.

> It's only replace_page_cache_page() that calls mem_cgroup_migrate() on
> a live page breaking mem_cgroup_css_from_page().
> 
> So the page looks fine, I'd just update the culprit function in the
> changelog and kerneldoc.

Alright, will update the comment and description.

Thanks.

-- 
tejun
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