linux-kernel - Re: [ckrm-tech] [patch00/05]: Containers(V2)- Introduction

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Date:	Wed, 20 Sep 2006 17:45:59 -0700
From:	Chandra Seetharaman <sekharan@...ibm.com>
To:	Paul Jackson <pj@....com>
Cc:	Paul Menage <menage@...gle.com>, npiggin@...e.de,
	ckrm-tech@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	rohitseth@...gle.com, devel@...nvz.org, clameter@....com
Subject: Re: [ckrm-tech] [patch00/05]: Containers(V2)- Introduction

On Wed, 2006-09-20 at 13:49 -0700, Paul Jackson wrote:

I concur with most of the comments (except as noted below)
> Paul M wrote:
> > Even if the resource control portions aren't totally compatible,
> > having two separate process container abstractions in the kernel is
> > sub-optimal
> 
> At heart, CKRM (ne Resource Groups) are (well, have been until now)
> different than cpusets.
> 
> Cpusets answers the question 'where', and Resource Groups 'how much'.
> 
> The fundamental motivation behind cpusets was to be able to enforce
> job isolation.  A job can get dedicated use of specified resources,
> -even- if it means those resources are severely underutilized by that
> job.
> 
> The fundamental motivation (Chandra or others correct me if I'm wrong)
> of Resource Groups is to improve capacity utilization while limiting
> starvation due to greedy, competing users for the same resources.
> 
> Cpusets seeks maximum isolation.  Resource Groups seeks maximum
> capacity utilization while preserving guaranteed levels of quality
> of service.
> 
> Cpusets are that wall between you and the neighbor you might not
> trust.  Resource groups are a large family of modest wealth sitting
> down to share a meal.

I am thinking hard about how to bring guarantee into this picture :).
 
> 
> It seems that cpusets can mimic memory resource groups.  I don't

I am little confused w.r.t how cpuset can mimic memory resource groups.
How can cpuset provide support for over commit.

> see how cpusets could mimic other resource groups.  But maybe I'm
> just being a dimm bulb.
> 
-- 

----------------------------------------------------------------------
    Chandra Seetharaman               | Be careful what you choose....
              - sekharan@...ibm.com   |      .......you may get it.
----------------------------------------------------------------------


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