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Re: [RFC] mm-controller [message #14359 is a reply to message #14358]

Mon, 25 June 2007 17:33

Balbir Singh
Messages: 491
Registered: August 2006

Senior Member

Peter Zijlstra wrote:
> On Fri, 2007-06-22 at 22:05 +0530, Vaidyanathan Srinivasan wrote:
>
>> Merging both limits will eliminate the issue, however we would need
>> individual limits for pagecache and RSS for better control. There are
>> use cases for pagecache_limit alone without RSS_limit like the case of
>> database application using direct IO, backup applications and
>> streaming applications that does not make good use of pagecache.
>
> I'm aware that some people want this. However we rejected adding a
> pagecache limit to the kernel proper on grounds that reclaim should do a
> better job.
>
> And now we're sneaking it in the backdoor.
>

We'll we are trying to provide a memory controller and page cache is a
part of memory. The page reclaimer does treat page cache separately.
Isn't this approach better than simply extending the vm_swappiness
to per container?

> If we're going to do this, get it in the kernel proper first.
>

I'm open to this. There were several patches to do this. We can do
this by splitting the LRU list to mapped and unmapped pages or
by trying to balance the page cache by tracking it's usage.

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

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[Message index]

		Re: [RFC] mm-controller By: Balbir Singh on Thu, 21 June 2007 11:03
		Re: [RFC] mm-controller By: Peter Zijlstra on Thu, 21 June 2007 13:50
		Re: [RFC] mm-controller By: Balbir Singh on Thu, 21 June 2007 17:31
		Re: [RFC] mm-controller By: Pavel Emelianov on Fri, 22 June 2007 02:21
		Re: [RFC] mm-controller By: Vaidyanathan Srinivas on Fri, 22 June 2007 16:35
		Re: [RFC] mm-controller By: Peter Zijlstra on Mon, 25 June 2007 16:22
		Re: [RFC] mm-controller By: Balbir Singh on Mon, 25 June 2007 17:33
		Re: [RFC] mm-controller By: Vaidyanathan Srinivas on Mon, 25 June 2007 18:02
		Re: [RFC] mm-controller By: Paul Menage on Mon, 25 June 2007 17:35
		Re: [RFC] mm-controller By: Paul Menage on Mon, 25 June 2007 17:36
		Re: [RFC] mm-controller By: Vaidyanathan Srinivas on Mon, 25 June 2007 18:22

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