[LSF/MM TOPIC] Memory controller discussions

[LSF/MM TOPIC] Memory controller discussions

[Pavel Emelyanov]

Hi.

On the MM sessions I'd like to participate in the memcg discussions.

Topics that are of the most interest to me are:

* kernel memory accounting
* dirty set management
* VM overcommit management
* LRU lists management

The first two issues are already described in respectively [1] and [2].
The 3rd issue was raised many times on the mailing lists, but I haven't
seen whether it was resolved finally and  would like to bring it up again.

Now about the 4th one (LRU lists management).

The existing memcg model uses page_cgroup object to track the page to 
memcg relation. Each page that belongs to some memcg has that object
allocated.

Such a design doesn't look very elegant from my POV, provides a memory
overhead and makes the mm/vmscan.c code looks not very nice, since each
page lives in up to two LRU lists :\

I wanted to propose the scheme used in the OpenVZ RHEL6-based kernel [3].
Briefly - in that scheme we introduce a lru_lists object which contains
the LRU list heads and statistics for that lists and each page belong so
some lru_list. A new memcg should allocate and use its own new lru_list.


[1] http://marc.info/?l=linux-mm&m=129686460401990
[2] http://marc.info/?l=linux-mm&m=129684641013000
[3] http://community.livejournal.com/openvz/34522.html

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