linux-kernel - Re: [RFC][PATCH 3/7] Data structures changes for RSS accounting

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Date:	Mon, 12 Mar 2007 09:48:04 -0700
From:	Dave Hansen <hansendc@...ibm.com>
To:	Kirill Korotaev <dev@...ru>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	containers@...ts.osdl.org, Paul Menage <menage@...gle.com>,
	Pavel Emelianov <xemul@...ru>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH 3/7] Data structures changes for RSS accounting

On Mon, 2007-03-12 at 19:16 +0300, Kirill Korotaev wrote:
> now VE2 maps the same page. You can't determine whether this page is mapped
> to this container or another one w/o page->container pointer. 

Hi Kirill,

I thought we can always get from the page to the VMA.  rmap provides
this to us via page->mapping and the 'struct address_space' or anon_vma.
Do we agree on that?

We can also get from the vma to the mm very easily, via vma->vm_mm,
right?

We can also get from a task to the container quite easily.  

So, the only question becomes whether there is a 1:1 relationship
between mm_structs and containers.  Does each mm_struct belong to one
and only one container?  Basically, can a threaded process have
different threads in different containers?

It seems that we could bridge the gap pretty easily by either assigning
each mm_struct to a container directly, or putting some kind of
task-to-mm lookup.  Perhaps just a list like
mm->tasks_using_this_mm_list.

Not rocket science, right?

-- Dave

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