linux-kernel - Re: [PATCH 2/8] Add container pointer on struct page

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Date:	Fri, 13 Apr 2007 15:56:37 +0200
From:	Jean-Pierre Dion <jean-pierre.dion@...l.net>
To:	Pavel Emelianov <xemul@...ru>
Cc:	Andrew Morton <akpm@...l.org>, Paul Menage <menage@...gle.com>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	Balbir Singh <balbir@...ibm.com>, devel@...nvz.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kirill Korotaev <dev@...ru>,
	Chandra Seetharaman <sekharan@...ibm.com>,
	Cedric Le Goater <clg@...ibm.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Rohit Seth <rohitseth@...g.frec.bull.fr>
Subject: Re: [PATCH 2/8] Add container pointer on struct page

Hi Pavel,

I have been implied in the work for the
memory controller of res groups a few months ago.

I see that you propose to modify the struct
page to point to rss container struct.
This has made some debate because of the struct
page size increase, but this allows a quicker
scan to reclaim pages (I mean having per-container
lists of active/inactive pages).
We (here at Bull and others) proposed this implementation
for res groups and I am interested in knowing
if this has a chance of being accepted today (hope so).
I know this uses memory for internal management
and increases a lot the memory size used for
a large memory configuration, but in that case
we have lot of memory, so where is the issue ?
We tested this on a 28 GB server and it worked.
Also we can use larger page size to reduce
the overhead, and I believe this makes sense
on large servers with big memory.

So we balance between using more memory internally
and so getting faster access to pages for reclaim,
or do nothing. ;-)

jean-pierre

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