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Re: [PATCH 8/8] Per-container pages reclamation [message #13638 is a reply to message #13632]

Thu, 31 May 2007 17:58

Andrew Morton
Messages: 127
Registered: December 2005

Senior Member

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?

If so, the problem which I see is that, under rare circumstances, that
final put_page() will occur from interrupt context. Hence we would be
trying to remove the page from the per-container LRU at interrupt time.
But the locks which you have in there are not suited for taking from
interrupt context.

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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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