linux-kernel - Re: [PATCH v3 04/13] kmem accounting basic infrastructure

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Date:	Wed, 26 Sep 2012 10:44:32 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Glauber Costa <glommer@...allels.com>
Cc:	Michal Hocko <mhocko@...e.cz>, linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org, kamezawa.hiroyu@...fujitsu.com,
	devel@...nvz.org, linux-mm@...ck.org,
	Suleiman Souhlal <suleiman@...gle.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH v3 04/13] kmem accounting basic infrastructure

Hello, Glauber.

On Wed, Sep 26, 2012 at 10:36 AM, Glauber Costa <glommer@...allels.com> wrote:
> This was discussed multiple times. Our interest is to preserve existing
> deployed setup, that were tuned in a world where kmem didn't exist.
> Because we also feed kmem to the user counter, this may very well
> disrupt their setup.

So, that can be served by .kmem_accounted at root, no?

> User memory, unlike kernel memory, may very well be totally in control
> of the userspace application, so it is not unreasonable to believe that
> extra pages appearing in a new kernel version may break them.
>
> It is actually a much worse compatibility problem than flipping
> hierarchy, in comparison

Again, what's wrong with one switch at the root?

Thanks.

-- 
tejun
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