Re: [RFC] [PATCH 3/4] Reclaim from groups over their soft limit under memory pressure

[Balbir Singh <balbir@linux.vnet.ibm.com>]

KAMEZAWA Hiroyuki wrote:
> On Thu, 14 Feb 2008 21:16:48 -0800
> "Paul Menage" <menage@google.com> wrote:
> 
>> On Thu, Feb 14, 2008 at 9:07 PM, KAMEZAWA Hiroyuki
>> <kamezawa.hiroyu@jp.fujitsu.com> wrote:
>>>  We can free memory by just making memory.limit to smaller number.
>>>  (This may cause OOM. If we added high-low watermark, making memory.high smaller
>>>   can works well for memory freeing to some extent.)
>>>
>> What about if we want to apply memory pressure to a cgroup to push out
>> unused memory, but not push out memory that it's actively using?
>>
> Generally, only way to avoid pageout is mlock() because actively-used is just
> determeined by reference-bit and heavy pressure can do page-scanning too much.
> I hope that RvR's LRU improvement may change things better.

There are two other controllers, I plan to work on soon. The mlock() and virtual
memory limit controller. Hopefully that should fix the mlock() problem to some
extent.

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL

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