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Re: Re: [RFC][PATCH 2/7] RSS controller core [message #11083 is a reply to message #10902]

Tue, 13 March 2007 10:06

dev
Messages: 1693
Registered: September 2005
Location: Moscow

Senior Member

Andrew Morton wrote:
>>>> - shared mappings of 'shared' files (binaries
>>>> and libraries) to allow for reduced memory
>>>> footprint when N identical guests are running
>>>
>>>So, it sounds like this can be phrased as a requirement like:
>>>
>>> "Guests must be able to share pages."
>>>
>>>Can you give us an idea why this is so?
>>
>>sure, one reason for this is that guests tend to
>>be similar (or almost identical) which results
>>in quite a lot of 'shared' libraries and executables
>>which would otherwise get cached for each guest and
>>would also be mapped for each guest separately
>
>
> nooooooo. What you're saying there amounts to text replication. There is
> no proposal here to create duplicated copies of pagecache pages: the VM
> just doesn't support that (Nick has soe protopatches which do this as a
> possible NUMA optimisation).
>
> So these mmapped pages will contiue to be shared across all guests. The
> problem boils down to "which guest(s) get charged for each shared page".
>
> A simple and obvious and easy-to-implement answer is "the guest which paged
> it in". I think we should firstly explain why that is insufficient.
I guess by "paged it in" you essentially mean
"mapped the page into address space for the *first* time"?

i.e. how many times the same page mapped into 2 address spaces
in the same container should be accounted for?

We believe ONE. It is better due to:
- it allows better estimate how much RAM container uses.
- if one container mapped a single page 10,000 times,
it doesn't mean it is worse than a container which mapped only 200 pages
and that it should be killed in case of OOM.

Thanks,
Kirill

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[Message index]

		[RFC][PATCH 0/7] Resource controllers based on process containers By: xemul on Tue, 06 March 2007 14:42
		[RFC][PATCH 1/7] Resource counters By: xemul on Tue, 06 March 2007 14:47
		Re: [RFC][PATCH 1/7] Resource counters By: Balbir Singh on Wed, 07 March 2007 04:03
		Re: [RFC][PATCH 1/7] Resource counters By: xemul on Wed, 07 March 2007 07:17
		Re: [RFC][PATCH 1/7] Resource counters By: Herbert Poetzl on Fri, 09 March 2007 16:37
		Re: [RFC][PATCH 1/7] Resource counters By: xemul on Sun, 11 March 2007 09:01
		Re: [RFC][PATCH 1/7] Resource counters By: ebiederm on Sun, 11 March 2007 19:00
		Re: [RFC][PATCH 1/7] Resource counters By: Herbert Poetzl on Mon, 12 March 2007 01:16
		Re: [RFC][PATCH 1/7] Resource counters By: ebiederm on Tue, 13 March 2007 09:09
		Re: [RFC][PATCH 1/7] Resource counters By: xemul on Tue, 13 March 2007 09:27
		Re: [RFC][PATCH 1/7] Resource counters By: Herbert Poetzl on Tue, 13 March 2007 15:21
		Re: [RFC][PATCH 1/7] Resource counters By: xemul on Tue, 13 March 2007 15:41
		Re: [RFC][PATCH 1/7] Resource counters By: Srivatsa Vaddagiri on Tue, 13 March 2007 16:07
		Re: [RFC][PATCH 1/7] Resource counters By: xemul on Wed, 14 March 2007 07:12
		Re: [RFC][PATCH 1/7] Resource counters By: ebiederm on Thu, 15 March 2007 16:51
		Re: Re: [RFC][PATCH 1/7] Resource counters By: dev on Tue, 13 March 2007 09:36
		Re: [RFC][PATCH 1/7] Resource counters By: Herbert Poetzl on Tue, 13 March 2007 16:32
		[RFC][PATCH 2/7] RSS controller core By: xemul on Tue, 06 March 2007 14:53
		Re: [RFC][PATCH 2/7] RSS controller core By: Andrew Morton on Tue, 06 March 2007 22:00
		Re: [RFC][PATCH 2/7] RSS controller core By: dev on Sun, 11 March 2007 12:13
		Re: [RFC][PATCH 2/7] RSS controller core By: Andrew Morton on Sun, 11 March 2007 12:51
		Re: [RFC][PATCH 2/7] RSS controller core By: Balbir Singh on Sun, 11 March 2007 15:51
		Re: [RFC][PATCH 2/7] RSS controller core By: ebiederm on Sun, 11 March 2007 19:34
		Re: [RFC][PATCH 2/7] RSS controller core By: Herbert Poetzl on Mon, 12 March 2007 01:00
		Re: [RFC][PATCH 2/7] RSS controller core By: Dave Hansen on Mon, 12 March 2007 18:42
		Re: [RFC][PATCH 2/7] RSS controller core By: Herbert Poetzl on Mon, 12 March 2007 22:41
		Re: [RFC][PATCH 2/7] RSS controller core By: xemul on Mon, 12 March 2007 09:02
		Re: [RFC][PATCH 2/7] RSS controller core By: Herbert Poetzl on Mon, 12 March 2007 21:11
		Re: [RFC][PATCH 2/7] RSS controller core By: xemul on Tue, 13 March 2007 07:17
		Re: [RFC][PATCH 2/7] RSS controller core By: Herbert Poetzl on Tue, 13 March 2007 15:05
		Re: [RFC][PATCH 2/7] RSS controller core By: xemul on Tue, 13 March 2007 15:32
		Re: [RFC][PATCH 2/7] RSS controller core By: dev on Tue, 13 March 2007 15:10
		Re: Re: [RFC][PATCH 2/7] RSS controller core By: Kirill Korotaev on Mon, 12 March 2007 09:10
		Re: Re: [RFC][PATCH 2/7] RSS controller core By: ebiederm on Tue, 13 March 2007 09:26
		Re: Re: [RFC][PATCH 2/7] RSS controller core By: dev on Tue, 13 March 2007 15:30
		Re: Re: [RFC][PATCH 2/7] RSS controller core By: dev on Tue, 13 March 2007 10:06
		Re: Re: [RFC][PATCH 2/7] RSS controller core By: Andrew Morton on Tue, 13 March 2007 10:49
		Re: Re: [RFC][PATCH 2/7] RSS controller core By: Herbert Poetzl on Tue, 13 March 2007 14:59
		Re: [RFC][PATCH 2/7] RSS controller core By: Dave Hansen on Tue, 13 March 2007 17:05
		Re: [RFC][PATCH 2/7] RSS controller core By: mel on Wed, 14 March 2007 15:38
		Re: Re: [RFC][PATCH 2/7] RSS controller core By: Paul Menage on Sun, 18 March 2007 22:44
		Re: Re: [RFC][PATCH 2/7] RSS controller core By: ebiederm on Mon, 19 March 2007 17:41
		Re: [RFC][PATCH 2/7] RSS controller core By: Herbert Poetzl on Fri, 09 March 2007 16:48
		Re: [RFC][PATCH 2/7] RSS controller core By: xemul on Sun, 11 March 2007 09:08
		Re: [RFC][PATCH 2/7] RSS controller core By: Herbert Poetzl on Sun, 11 March 2007 14:32
		Re: [RFC][PATCH 2/7] RSS controller core By: xemul on Sun, 11 March 2007 15:04
		Re: [RFC][PATCH 2/7] RSS controller core By: Herbert Poetzl on Mon, 12 March 2007 00:41
		Re: [RFC][PATCH 2/7] RSS controller core By: xemul on Mon, 12 March 2007 08:31
		Re: [RFC][PATCH 2/7] RSS controller core By: Balbir Singh on Mon, 12 March 2007 09:55
		Re: [RFC][PATCH 2/7] RSS controller core By: Herbert Poetzl on Mon, 12 March 2007 23:43
		Re: [RFC][PATCH 2/7] RSS controller core By: Balbir Singh on Tue, 13 March 2007 01:57
		Re: [RFC][PATCH 2/7] RSS controller core By: Srivatsa Vaddagiri on Tue, 13 March 2007 02:24
		Re: [RFC][PATCH 2/7] RSS controller core By: Herbert Poetzl on Tue, 13 March 2007 16:06
		Re: [RFC][PATCH 2/7] RSS controller core By: Balbir Singh on Wed, 07 March 2007 05:37
		Re: [RFC][PATCH 2/7] RSS controller core By: xemul on Wed, 07 March 2007 07:25
		Re: [RFC][PATCH 2/7] RSS controller core By: Dave Hansen on Mon, 12 March 2007 23:02
		Re: [RFC][PATCH 2/7] RSS controller core By: ebiederm on Sun, 18 March 2007 16:58
		Re: [RFC][PATCH 2/7] RSS controller core By: akpm on Tue, 13 March 2007 06:04
		Re: [RFC][PATCH 2/7] RSS controller core By: Dave Hansen on Tue, 13 March 2007 17:26
		Re: [RFC][PATCH 2/7] RSS controller core By: Alan Cox on Tue, 13 March 2007 19:09
		Re: [RFC][PATCH 2/7] RSS controller core By: ebiederm on Fri, 16 March 2007 00:55
		Re: [RFC][PATCH 2/7] RSS controller core By: Dave Hansen on Fri, 16 March 2007 16:31
		Re: [RFC][PATCH 2/7] RSS controller core By: ebiederm on Fri, 16 March 2007 18:54
		Re: [RFC][PATCH 2/7] RSS controller core By: mel on Wed, 14 March 2007 16:47
		Re: [RFC][PATCH 2/7] RSS controller core By: Dave Hansen on Tue, 13 March 2007 20:28
		Re: [RFC][PATCH 2/7] RSS controller core By: Herbert Poetzl on Tue, 13 March 2007 15:11
		Re: [RFC][PATCH 2/7] RSS controller core By: dev on Tue, 13 March 2007 15:54
		Re: [RFC][PATCH 2/7] RSS controller core By: Dave Hansen on Wed, 14 March 2007 20:42
		Re: [RFC][PATCH 2/7] RSS controller core By: mel on Tue, 20 March 2007 18:57
		Re: [RFC][PATCH 2/7] RSS controller core By: Dave Hansen on Fri, 16 March 2007 19:46
		Re: [RFC][PATCH 2/7] RSS controller core By: ebiederm on Sun, 18 March 2007 17:42
		Re: [RFC][PATCH 2/7] RSS controller core By: Herbert Poetzl on Mon, 19 March 2007 15:48
		controlling mmap()'d vs read/write() pages By: Dave Hansen on Tue, 20 March 2007 16:15
		Re: controlling mmap()'d vs read/write() pages By: ebiederm on Tue, 20 March 2007 21:19
		Re: controlling mmap()'d vs read/write() pages By: Herbert Poetzl on Fri, 23 March 2007 00:51
		Re: controlling mmap()'d vs read/write() pages By: Nick Piggin on Fri, 23 March 2007 05:57
		Re: controlling mmap()'d vs read/write() pages By: ebiederm on Fri, 23 March 2007 10:12
		Re: controlling mmap()'d vs read/write() pages By: Dave Hansen on Fri, 23 March 2007 16:41
		Re: controlling mmap()'d vs read/write() pages By: Herbert Poetzl on Fri, 23 March 2007 18:16
		Re: controlling mmap()'d vs read/write() pages By: Balbir Singh on Wed, 28 March 2007 09:18
		Re: controlling mmap()'d vs read/write() pages By: Nick Piggin on Fri, 23 March 2007 10:47
		Re: controlling mmap()'d vs read/write() pages By: ebiederm on Fri, 23 March 2007 12:21
		Re: controlling mmap()'d vs read/write() pages By: Nick Piggin on Wed, 28 March 2007 07:33
		[RFC][PATCH 3/7] Data structures changes for RSS accounting By: xemul on Tue, 06 March 2007 14:55
		Re: [RFC][PATCH 3/7] Data structures changes for RSS accounting By: ebiederm on Sun, 11 March 2007 19:13
		Re: [RFC][PATCH 3/7] Data structures changes for RSS accounting By: dev on Mon, 12 March 2007 16:16
		Re: [RFC][PATCH 3/7] Data structures changes for RSS accounting By: Dave Hansen on Mon, 12 March 2007 16:48
		Re: [RFC][PATCH 3/7] Data structures changes for RSS accounting By: xemul on Mon, 12 March 2007 17:19
		Re: [RFC][PATCH 3/7] Data structures changes for RSS accounting By: Balbir Singh on Mon, 12 March 2007 17:21
		Re: [RFC][PATCH 3/7] Data structures changes for RSS accounting By: Dave Hansen on Mon, 12 March 2007 17:27
		Re: [RFC][PATCH 3/7] Data structures changes for RSS accounting By: xemul on Tue, 13 March 2007 07:10
		[RFC][PATCH 4/7] RSS accounting hooks over the code By: xemul on Tue, 06 March 2007 14:57
		Re: [RFC][PATCH 4/7] RSS accounting hooks over the code By: xemul on Wed, 14 March 2007 15:43
		Re: [RFC][PATCH 4/7] RSS accounting hooks over the code By: Cedric Le Goater on Wed, 14 March 2007 15:37
		Re: [RFC][PATCH 4/7] RSS accounting hooks over the code By: ebiederm on Sun, 11 March 2007 19:14
		Re: [RFC][PATCH 4/7] RSS accounting hooks over the code By: dev on Mon, 12 March 2007 16:23
		Re: [RFC][PATCH 4/7] RSS accounting hooks over the code By: Dave Hansen on Mon, 12 March 2007 16:50
		Re: [RFC][PATCH 4/7] RSS accounting hooks over the code By: dev on Mon, 12 March 2007 17:07
		Re: [RFC][PATCH 4/7] RSS accounting hooks over the code By: Herbert Poetzl on Mon, 12 March 2007 23:54
		Re: [RFC][PATCH 4/7] RSS accounting hooks over the code By: ebiederm on Tue, 13 March 2007 09:58
		Re: [RFC][PATCH 4/7] RSS accounting hooks over the code By: Nick Piggin on Tue, 13 March 2007 10:25
		Re: [RFC][PATCH 4/7] RSS accounting hooks over the code By: Ethan Solomita on Wed, 28 March 2007 20:15
		Re: [RFC][PATCH 4/7] RSS accounting hooks over the code By: Dave Hansen on Mon, 12 March 2007 17:33
		Re: [RFC][PATCH 4/7] RSS accounting hooks over the code By: ebiederm on Tue, 13 March 2007 09:43
		Re: [RFC][PATCH 4/7] RSS accounting hooks over the code By: ebiederm on Tue, 13 March 2007 16:01
		Re: [RFC][PATCH 4/7] RSS accounting hooks over the code By: Nick Piggin on Wed, 14 March 2007 03:51
		Re: [RFC][PATCH 4/7] RSS accounting hooks over the code By: Balbir Singh on Wed, 14 March 2007 06:42
		Re: [RFC][PATCH 4/7] RSS accounting hooks over the code By: Nick Piggin on Wed, 14 March 2007 06:57
		Re: [RFC][PATCH 4/7] RSS accounting hooks over the code By: Balbir Singh on Wed, 14 March 2007 07:48
		Re: [RFC][PATCH 4/7] RSS accounting hooks over the code By: Vaidyanathan Srinivas on Wed, 14 March 2007 13:25
		Re: [RFC][PATCH 4/7] RSS accounting hooks over the code By: Nick Piggin on Wed, 14 March 2007 13:49
		Re: [RFC][PATCH 4/7] RSS accounting hooks over the code By: dev on Wed, 14 March 2007 16:16
		Re: [RFC][PATCH 4/7] RSS accounting hooks over the code By: Nick Piggin on Thu, 15 March 2007 05:01
		Re: [RFC][PATCH 4/7] RSS accounting hooks over the code By: Vaidyanathan Srinivas on Wed, 14 March 2007 14:43
		Re: [RFC][PATCH 4/7] RSS accounting hooks over the code By: Balbir Singh on Thu, 15 March 2007 05:44
		[RFC][PATCH 5/7] Per-container OOM killer and page reclamation By: xemul on Tue, 06 March 2007 15:01
		Re: [RFC][PATCH 5/7] Per-container OOM killer and page reclamation By: Balbir Singh on Fri, 09 March 2007 21:21
		Re: [RFC][PATCH 5/7] Per-container OOM killer and page reclamation By: xemul on Sun, 11 March 2007 08:39
		[RFC][PATCH 6/7] Account for the number of tasks within container By: xemul on Tue, 06 March 2007 15:02
		Re: [RFC][PATCH 6/7] Account for the number of tasks within container By: Paul Menage on Wed, 07 March 2007 02:00
		Re: [RFC][PATCH 6/7] Account for the number of tasks within container By: xemul on Wed, 07 March 2007 07:10
		Re: [RFC][PATCH 6/7] Account for the number of tasks within container By: Paul Menage on Thu, 08 March 2007 13:49
		Re: [RFC][PATCH 6/7] Account for the number of tasks within container By: xemul on Sun, 11 March 2007 08:34
		[RFC][PATCH 7/7] Account for the number of files opened within container By: xemul on Tue, 06 March 2007 15:05
		Re: [RFC][PATCH 0/7] Resource controllers based on process containers By: Paul Menage on Wed, 07 March 2007 02:02
		Re: [RFC][PATCH 0/7] Resource controllers based on process containers By: xemul on Wed, 07 March 2007 07:27
		Re: [RFC][PATCH 0/7] Resource controllers based on process containers By: Balbir Singh on Wed, 07 March 2007 06:52
		Re: [RFC][PATCH 0/7] Resource controllers based on process containers By: xemul on Wed, 07 March 2007 07:30
		Re: [RFC][PATCH 0/7] Resource controllers based on process containers By: dev on Wed, 07 March 2007 09:30

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