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Re: [PATCH 8/8] Per-container pages reclamation [message #13659 is a reply to message #13657]

Fri, 01 June 2007 07:49

Andrew Morton
Messages: 127
Registered: December 2005

Senior Member

On Fri, 01 Jun 2007 11:44:25 +0400 Pavel Emelianov <xemul@openvz.org> wrote:

> Andrew Morton wrote:
> > On Thu, 31 May 2007 14:35:43 +0400
> > Pavel Emelianov <xemul@openvz.org> wrote:
> >
> >>> Would I be correct in guessing that pages which are on the
> >>> per-rss-container lists are also eligible for reclaim off the traditional
> >>> page LRUs? If so, how does that work? When a page gets freed off the
> >> Yes. All the pages are accessible from booth - global and per-container
> >> LRU lists and reclamation can be performed from booth.
> >>
> >>> per-zone LRUs does it also get removed from the per-rss_container LRU? But
> >>> how can this be right?
> >> I don't get your idea here.
> >
> > If we have a page which is on the zone LRU with refcount=1 and someone does
> > put_page() on it, we will take that page off the zone LRU and then actually
> > free the page.
> >
> > I am assuming that your patches change that logic so that we will also
> > remove that page from the per-container LRU at the same time?
>
> Oh, I see. No that will work another way. Page stays in per-container
> LRU lists as long as it is mapped. When the last process is unmapping
> the page, it it is removed, but stays in global LRU till its refcount
> drops to 0.

ho hum, OK. This wasn't obvious from the code and it isn't something
I should have learned by emailing you guys! Please have a think about
preparing an overall decription of the design and implementation of this
rather important kernel change?

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[Message index]

		[PATCH 0/8] RSS controller based on process containers (v3) By: Pavel Emelianov on Wed, 30 May 2007 15:24
		[PATCH 4/8] RSS container core By: Pavel Emelianov on Wed, 30 May 2007 15:27
		Re: [PATCH 4/8] RSS container core By: Andrew Morton on Wed, 30 May 2007 21:46
		Re: [PATCH 4/8] RSS container core By: Pavel Emelianov on Thu, 31 May 2007 08:57
		[PATCH 5/8] RSS accounting hooks over the code By: Pavel Emelianov on Wed, 30 May 2007 15:29
		Re: [PATCH 5/8] RSS accounting hooks over the code By: Andrew Morton on Wed, 30 May 2007 21:46
		Re: [PATCH 5/8] RSS accounting hooks over the code By: Balbir Singh on Fri, 01 June 2007 06:48
		[PATCH 6/8] Per container OOM killer By: Pavel Emelianov on Wed, 30 May 2007 15:31
		[PATCH 7/8] Scanner changes needed to implement per-container scanner By: Pavel Emelianov on Wed, 30 May 2007 15:35
		Re: [PATCH 7/8] Scanner changes needed to implement per-container scanner By: Andrew Morton on Wed, 30 May 2007 21:46
		Re: [PATCH 7/8] Scanner changes needed to implement per-container scanner By: Balbir Singh on Fri, 01 June 2007 06:50
		Re: [PATCH 7/8] Scanner changes needed to implement per-container scanner By: Pavel Emelianov on Fri, 01 June 2007 07:36
		Re: [PATCH 7/8] Scanner changes needed to implement per-container scanner By: Balbir Singh on Fri, 01 June 2007 07:38
		[PATCH 8/8] Per-container pages reclamation By: Pavel Emelianov on Wed, 30 May 2007 15:38
		Re: [PATCH 8/8] Per-container pages reclamation By: Andrew Morton on Wed, 30 May 2007 21:47
		Re: [PATCH 8/8] Per-container pages reclamation By: Vaidyanathan Srinivas on Thu, 31 May 2007 08:22
		Re: [PATCH 8/8] Per-container pages reclamation By: Balbir Singh on Thu, 31 May 2007 09:22
		Re: [PATCH 8/8] Per-container pages reclamation By: Pavel Emelianov on Fri, 01 June 2007 09:23
		Re: [PATCH 8/8] Per-container pages reclamation By: Balbir Singh on Fri, 01 June 2007 09:23
		Re: [PATCH 8/8] Per-container pages reclamation By: Pavel Emelianov on Thu, 31 May 2007 10:31
		Re: [PATCH 8/8] Per-container pages reclamation By: Andrew Morton on Thu, 31 May 2007 17:58
		Re: [PATCH 8/8] Per-container pages reclamation By: Pavel Emelianov on Fri, 01 June 2007 07:40
		Re: [PATCH 8/8] Per-container pages reclamation By: Andrew Morton on Fri, 01 June 2007 07:49
		Re: [PATCH 8/8] Per-container pages reclamation By: Balbir Singh on Fri, 01 June 2007 07:02
		Re: [PATCH 8/8] Per-container pages reclamation By: Pavel Emelianov on Fri, 01 June 2007 07:47

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