Re: [LSF/MM TOPIC] memory control groups

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* Michel Lespinasse <walken@xxxxxxxxxx> [2011-02-06 07:45:05]:

> On Mon, Jan 17, 2011 at 11:14 AM, Johannes Weiner <hannes@xxxxxxxxxxx> wrote:
> > on the MM summit, I would like to talk about the current state of
> > memory control groups, the features and extensions that are currently
> > being developed for it, and what their status is.
> >
> > I am especially interested in talking about the current runtime memory
> > overhead memcg comes with (1% of ram) and what we can do to shrink it.
> > [...]
> > Would other people be interested in discussing this?
> 
> Well, YES :)
> 
> In addition to what you mentioned, I believe it would be possible to
> avoid the duplication of global vs per-cgroup LRU lists. global
> scanning would translate into proportional scanning of all per-cgroup
> lists. If we could get that done, it would IMO become reasonable to
> integrate back the remaining few page_cgroup fields into struct page
> itself...
>

We thought about the duplication and proportial scanning quite a bit
prior to final design and integration, but it does not scale well as
cgroups increase in number. I would also like to discuss things
like accounting shared pages, etc. 

-- 
	Three Cheers,
	Balbir

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