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Re: [PATCH v3 04/13] kmem accounting basic infrastructure [message #48066 is a reply to message #48065]

Wed, 26 September 2012 18:56

Glauber Costa
Messages: 916
Registered: October 2011

Senior Member

On 09/26/2012 10:01 PM, Tejun Heo wrote:
> Hello,
>
> On Wed, Sep 26, 2012 at 09:53:09PM +0400, Glauber Costa wrote:
>> I understand your trauma about over flexibility, and you know I share of
>> it. But I don't think there is any need to cap it here. Given kmem
>> accounted is perfectly hierarchical, and there seem to be plenty of
>> people who only care about user memory, I see no reason to disallow a
>> mixed use case here.
>>
>> I must say that for my particular use case, enabling it unconditionally
>> would just work, so it is not that what I have in mind.
>
> So, I'm not gonna go as far as pushing for enabling it unconditionally
> but would really like to hear why it's necessary to make it per node
> instead of one global switch. Maybe it has already been discussed to
> hell and back. Care to summarize / point me to it?
>

For me, it is the other way around: it makes perfect sense to have a
per-subtree selection of features where it doesn't hurt us, provided it
is hierarchical. For the mere fact that not every application is
interested in this (Michal is the one that is being so far more vocal
about this not being needed in some use cases), and it is perfectly
valid to imagine such applications would coexist.

So given the flexibility it brings, the real question is, as I said,
backwards: what is it necessary to make it a global switch ?

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[Message index]

		[PATCH v3 04/13] kmem accounting basic infrastructure By: Glauber Costa on Tue, 18 September 2012 14:04
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Tejun Heo on Fri, 21 September 2012 16:34
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Glauber Costa on Mon, 24 September 2012 08:09
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Michal Hocko on Wed, 26 September 2012 14:03
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Glauber Costa on Wed, 26 September 2012 14:33
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Michal Hocko on Wed, 26 September 2012 16:01
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Glauber Costa on Wed, 26 September 2012 17:34
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Tejun Heo on Wed, 26 September 2012 16:36
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Glauber Costa on Wed, 26 September 2012 17:36
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Tejun Heo on Wed, 26 September 2012 17:44
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Glauber Costa on Wed, 26 September 2012 17:53
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Tejun Heo on Wed, 26 September 2012 18:01
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Glauber Costa on Wed, 26 September 2012 18:56
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Tejun Heo on Wed, 26 September 2012 19:34
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Glauber Costa on Wed, 26 September 2012 19:46
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Tejun Heo on Wed, 26 September 2012 19:56
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Glauber Costa on Wed, 26 September 2012 20:02
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Tejun Heo on Wed, 26 September 2012 20:16
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Glauber Costa on Wed, 26 September 2012 21:24
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Tejun Heo on Wed, 26 September 2012 22:10
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Glauber Costa on Wed, 26 September 2012 22:29
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Tejun Heo on Wed, 26 September 2012 22:42
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Glauber Costa on Wed, 26 September 2012 22:54
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Tejun Heo on Wed, 26 September 2012 23:08
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Glauber Costa on Wed, 26 September 2012 23:20
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Tejun Heo on Wed, 26 September 2012 23:33
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Michal Hocko on Thu, 27 September 2012 12:15
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Glauber Costa on Thu, 27 September 2012 12:20
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Michal Hocko on Thu, 27 September 2012 12:40
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Glauber Costa on Thu, 27 September 2012 12:40
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Michal Hocko on Thu, 27 September 2012 12:54
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Mel Gorman on Thu, 27 September 2012 14:28
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Tejun Heo on Thu, 27 September 2012 14:49
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Glauber Costa on Thu, 27 September 2012 14:57
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Tejun Heo on Thu, 27 September 2012 17:46
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Michal Hocko on Thu, 27 September 2012 17:56
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Glauber Costa on Thu, 27 September 2012 18:45
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Tejun Heo on Sun, 30 September 2012 07:57
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Tejun Heo on Sun, 30 September 2012 08:02
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: James Bottomley on Sun, 30 September 2012 08:56
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Tejun Heo on Sun, 30 September 2012 10:37
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: James Bottomley on Sun, 30 September 2012 11:25
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Tejun Heo on Mon, 01 October 2012 00:57
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Glauber Costa on Mon, 01 October 2012 08:43
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Glauber Costa on Mon, 01 October 2012 08:46
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Tejun Heo on Wed, 03 October 2012 22:59
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Glauber Costa on Mon, 01 October 2012 08:36
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Michal Hocko on Thu, 27 September 2012 12:08
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Glauber Costa on Thu, 27 September 2012 12:11
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Tejun Heo on Thu, 27 September 2012 14:33
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Mel Gorman on Thu, 27 September 2012 14:43
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Tejun Heo on Thu, 27 September 2012 14:58
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Glauber Costa on Thu, 27 September 2012 18:30
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Tejun Heo on Sun, 30 September 2012 08:23
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Glauber Costa on Mon, 01 October 2012 08:45
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Tejun Heo on Wed, 03 October 2012 22:54
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Glauber Costa on Thu, 04 October 2012 11:55
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Tejun Heo on Sat, 06 October 2012 02:19
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Michal Hocko on Thu, 27 September 2012 15:09
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Tejun Heo on Sun, 30 September 2012 08:47
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Michal Hocko on Mon, 01 October 2012 09:27
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Tejun Heo on Wed, 03 October 2012 22:43
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Michal Hocko on Fri, 05 October 2012 13:47
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Johannes Weiner on Wed, 26 September 2012 22:11
		Re: [PATCH v3 04/13] kmem accounting basic infrastructure By: Glauber Costa on Wed, 26 September 2012 22:45

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