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From: Balbir Singh <balbir@linux.vnet.ibm.com>
To: Paul Jackson <pj@sgi.com>
Cc: menage@google.com, vatsa@in.ibm.com,
	ckrm-tech@lists.sourceforge.net, balbir@in.ibm.com,
	haveblue@us.ibm.com, xemul@sw.ru, dev@sw.ru,
	containers@lists.osdl.org, devel@openvz.org,
	ebiederm@xmission.com, mbligh@google.com, rohitseth@google.com,
	serue@us.ibm.com, akpm@linux-foundation.org,
	svaidy@linux.vnet.ibm.com, linux-kernel@vger.kernel.org
Subject: Re: [ckrm-tech] [PATCH 1/9] Containers (V9): Basic container framework
Date: Thu, 10 May 2007 09:39:55 +0530	[thread overview]
Message-ID: <46429B13.6090402@linux.vnet.ibm.com> (raw)
In-Reply-To: <20070501231254.4267777e.pj@sgi.com>

Paul Jackson wrote:
> Balbir wrote:

> 
> 1) Testing batch schedulers against cpusets:
> 
>     I doubt that the batch scheduler developers would be able to
>     extract a cpuset test from their tests, or be able to share it if
>     they did.  Their tests tend to be large tests of batch schedulers,
>     and only incidentally test cpusets -- if we break cpusets,
>     in sometimes even subtle ways that they happen to depend on,
>     we break them.
> 
>     Sometimes there is no way to guess exactly what sorts of changes
>     will break their code; we'll just have to schedule at least one
>     run through one or more of them that rely heavily on cpusets
>     before a change as big as rebasing cpusets on containers is
>     reasonably safe.  This test cycle won't be all that easy, so I'd
>     wait until we are pretty close to what we think should be taken
>     into the mainline kernel.
> 
>     I suppose I will have to be the one co-ordinating this test,
>     as I am the only one I know with a presence in both camps.
> 
>     Once this test is done, from then forward, if we break them,
>     we'll just have to deal with it as we do now, when the breakage
>     shows up well down stream from the main kernel tree, at the point
>     that a major batch scheduler release runs into a major distribution
>     release containing the breakage.  There is no practical way that I
>     can see, as an ongoing basis, to continue testing for such breakage
>     with every minor change to cpuset related code in the kernel.  Any
>     breakage found this way is dealt with by changes in user level code.
> 
>     Once again, I have bcc'd one or more developers of batch schedulers,
>     so they can see what nonsense I am spouting about them now ;).
> 

That sounds reasonable to me

> 2) Testing cpusets with a specific test.
> 
>     There I can do better.  Attached is the cpuset regression test I
>     use.  It requires at least 4 cpus and 2 memory nodes to do anything
>     useful.  It is copyright by SGI, released under GPL license.
> 
>     This regression test is the primary cpuset test upon which I
>     relied during the development of cpusets, and continue to rely.
>     Except for one subtle race condition in the test itself, it has
>     not changed in the last two to three years.
> 
>     This test requires no user level code not found in an ordinary
>     distro.  It does require the taskset and numactl commands,
>     for the purposes of testing certain interactions with them.
>     It assumes that there are not other cpusets currently setup in
>     the system that happen to conflict with the ones it creates.
> 
>     See further comments within the test script itself.
> 

Thanks for the script. Would you like to contribute this script to
LTP for wider availability and testing?

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL

  reply	other threads:[~2007-05-10  4:10 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-04-27 10:46 [PATCH 0/9] Containers (V9): Generic Process Containers menage
2007-04-27 10:46 ` [PATCH 1/9] Containers (V9): Basic container framework menage
2007-04-29  3:12   ` [ckrm-tech] " Paul Jackson
2007-05-01 17:40   ` Balbir Singh
2007-05-01 17:46     ` Paul Menage
2007-05-01 18:40     ` [ckrm-tech] " Paul Jackson
2007-05-02  3:44       ` Balbir Singh
2007-05-02  6:12         ` Paul Jackson
2007-05-10  4:09           ` Balbir Singh [this message]
2007-05-10  4:47             ` Paul Jackson
2007-05-10  4:49               ` Balbir Singh
2007-04-27 10:46 ` [PATCH 2/9] Containers (V9): Example CPU accounting subsystem menage
2007-05-01 17:52   ` Balbir Singh
2007-04-27 10:46 ` [PATCH 3/9] Containers (V9): Add tasks file interface menage
2007-05-01 18:12   ` Balbir Singh
2007-05-01 20:37     ` [ckrm-tech] " Paul Menage
2007-05-02  3:25       ` Srivatsa Vaddagiri
2007-05-02  3:25         ` Paul Menage
2007-05-02  3:46           ` Srivatsa Vaddagiri
2007-05-08 14:51           ` Balbir Singh
2007-05-10 21:21             ` Paul Menage
2007-05-11  2:31               ` Balbir Singh
2007-05-02  3:58       ` Balbir Singh
2007-04-27 10:46 ` [PATCH 4/9] Containers (V9): Add fork/exit hooks menage
2007-04-27 10:46 ` [PATCH 5/9] Containers (V9): Add container_clone() interface menage
2007-04-27 10:46 ` [PATCH 6/9] Containers (V9): Add procfs interface menage
2007-04-27 10:46 ` [PATCH 7/9] Containers (V9): Make cpusets a client of containers menage
2007-04-27 10:46 ` [PATCH 8/9] Containers (V9): Share css_group arrays between tasks with same container memberships menage
2007-04-27 10:46 ` [PATCH 9/9] Containers (V9): Simple debug info subsystem menage
2007-04-29  1:47 ` [PATCH 0/9] Containers (V9): Generic Process Containers Paul Jackson
2007-04-29  9:37 ` Paul Jackson
2007-04-30 17:12   ` Srivatsa Vaddagiri
2007-04-30 17:09     ` Paul Menage
2007-04-30 18:06       ` Srivatsa Vaddagiri
2007-04-30 17:23     ` Christoph Hellwig
2007-04-30 18:16       ` [ckrm-tech] " Srivatsa Vaddagiri

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