From: Herbert Poetzl <herbert@13thfloor.at>
To: Srivatsa Vaddagiri <vatsa@in.ibm.com>
Cc: Paul Jackson <pj@sgi.com>,
ckrm-tech@lists.sourceforge.net, linux-kernel@vger.kernel.org,
xemul@sw.ru, ebiederm@xmission.com, winget@google.com,
containers@lists.osdl.org, menage@google.com,
akpm@linux-foundation.org
Subject: Re: [PATCH 0/2] resource control file system - aka containers on top of nsproxy!
Date: Sat, 3 Mar 2007 18:32:44 +0100 [thread overview]
Message-ID: <20070303173244.GA16051@MAIL.13thfloor.at> (raw)
In-Reply-To: <20070303093655.GA1028@in.ibm.com>
On Sat, Mar 03, 2007 at 03:06:55PM +0530, Srivatsa Vaddagiri wrote:
> On Thu, Mar 01, 2007 at 11:39:00AM -0800, Paul Jackson wrote:
> > vatsa wrote:
> > > I suspect we can make cpusets also work
> > > on top of this very easily.
> >
> > I'm skeptical, and kinda worried.
> >
> > ... can you show me the code that does this?
>
> In essense, the rcfs patch is same as the original containers
> patch. Instead of using task->containers->container[cpuset->hierarchy]
> to get to the cpuset structure for a task, it uses
> task->nsproxy->ctlr_data[cpuset->subsys_id].
>
> So if the original containers patches could implement cpusets on
> containers abstraction, I don't see why it is not possible to implement
> on top of nsproxy (which is essentialy same as container_group in Paul
> Menage's patches). Any way code speaks best and I will try to post
> something soon!
>
> > Namespaces are not the same thing as actual resources
> > (memory, cpu cycles, ...). Namespaces are fluid mappings;
> > Resources are scarce commodities.
>
> Yes, perhaps this overloads nsproxy more than what it was intended for.
> But, then if we have to to support resource management of each
> container/vserver (or whatever group is represented by nsproxy),
> then nsproxy seems the best place to store this resource control
> information for a container.
well, the thing is, as nsproxy is working now, you
will get a new one (with a changed subset of entries)
every time a task does a clone() with one of the
space flags set, which means, that you will end up
with quite a lot of them, but resource limits have
to address a group of them, not a single nsproxy
(or act in a deeply hierarchical way which is not
there atm, and probably will never be, as it simply
adds too much overhead)
> > I'm wagering you'll break either the semantics, and/or the
> > performance, of cpusets doing this.
>
> It should have the same perf overhead as the original
> container patches (basically a double dereference -
> task->containers/nsproxy->cpuset - required to get to the
> cpuset from a task).
on every limit accounting or check? I think that
is quite a lot of overhead ...
best,
Herbert
> Regarding semantics, can you be more specific?
>
> In fact I think it will facilitate containers to use cpusets more
> easily. You can for example divide the system into two (exclusive)
> cpusets A and B, and have container C1 work inside A while C2 uses C2.
> So c1's nsproxy->cpuset will point to A will c2's nsproxy->cpuset will
> point to B. If you dont want to split the cpus into cpusets like that,
> then all nsproxy's->cpuset will point to the top_cpuset.
>
> Basically the rcfs patches demonstrate that is possible to keep track
> of hierarchial relationship in resource objects using corresponding
> file system objects itself (like dentries). Also if we are hooked to
> nsproxy, lot of hard work to mainain life-time of nsproxy's (ref count
> ) is already in place -
> we just reuse that work. These should help us avoid the container
> structure abstraction in Paul Menage's patches (which was the main
> point of objection from last time).
>
> --
> Regards,
> vatsa
> _______________________________________________
> Containers mailing list
> Containers@lists.osdl.org
> https://lists.osdl.org/mailman/listinfo/containers
next prev parent reply other threads:[~2007-03-03 17:32 UTC|newest]
Thread overview: 125+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-01 13:35 [PATCH 0/2] resource control file system - aka containers on top of nsproxy! Srivatsa Vaddagiri
2007-03-01 13:45 ` [PATCH 1/2] rcfs core patch Srivatsa Vaddagiri
2007-03-01 16:31 ` Serge E. Hallyn
2007-03-01 16:46 ` Srivatsa Vaddagiri
2007-03-02 5:06 ` [ckrm-tech] " Balbir Singh
2007-03-03 9:38 ` Srivatsa Vaddagiri
2007-03-08 3:12 ` Eric W. Biederman
2007-03-08 9:10 ` Paul Menage
2007-03-09 0:38 ` Herbert Poetzl
2007-03-09 9:07 ` Kirill Korotaev
2007-03-09 13:29 ` Herbert Poetzl
2007-03-09 17:57 ` Srivatsa Vaddagiri
2007-03-10 1:19 ` Herbert Poetzl
2007-03-11 16:36 ` Serge E. Hallyn
2007-03-12 23:16 ` Herbert Poetzl
2007-03-08 10:13 ` Srivatsa Vaddagiri
2007-03-09 0:48 ` Herbert Poetzl
2007-03-09 2:35 ` Paul Jackson
2007-03-09 9:23 ` Kirill Korotaev
2007-03-09 9:38 ` Paul Jackson
2007-03-09 13:21 ` Herbert Poetzl
2007-03-11 17:09 ` Kirill Korotaev
2007-03-12 23:00 ` Herbert Poetzl
2007-03-13 8:28 ` Kirill Korotaev
2007-03-13 13:55 ` Herbert Poetzl
2007-03-13 14:11 ` [ckrm-tech] " Srivatsa Vaddagiri
2007-03-13 15:52 ` Herbert Poetzl
2007-03-09 18:14 ` Srivatsa Vaddagiri
2007-03-09 19:25 ` Paul Jackson
2007-03-10 1:00 ` Herbert Poetzl
2007-03-10 1:31 ` Paul Jackson
2007-03-10 0:56 ` Herbert Poetzl
2007-03-09 16:16 ` Serge E. Hallyn
2007-03-01 13:50 ` [PATCH 2/2] cpu_accounting controller Srivatsa Vaddagiri
2007-03-01 19:39 ` [PATCH 0/2] resource control file system - aka containers on top of nsproxy! Paul Jackson
2007-03-02 15:45 ` Kirill Korotaev
2007-03-02 16:52 ` Andrew Morton
2007-03-02 17:25 ` Kirill Korotaev
2007-03-03 17:45 ` Herbert Poetzl
2007-03-03 21:22 ` Paul Jackson
2007-03-05 17:47 ` Srivatsa Vaddagiri
2007-03-03 9:36 ` Srivatsa Vaddagiri
2007-03-03 10:21 ` Paul Jackson
2007-03-05 17:02 ` Srivatsa Vaddagiri
2007-03-03 17:32 ` Herbert Poetzl [this message]
2007-03-05 17:34 ` [ckrm-tech] " Srivatsa Vaddagiri
2007-03-05 18:39 ` Herbert Poetzl
2007-03-06 10:39 ` Srivatsa Vaddagiri
2007-03-06 13:28 ` Herbert Poetzl
2007-03-06 16:21 ` Srivatsa Vaddagiri
2007-03-07 2:32 ` Paul Menage
2007-03-07 17:30 ` Srivatsa Vaddagiri
2007-03-07 17:29 ` Paul Menage
2007-03-07 17:52 ` [ckrm-tech] " Srivatsa Vaddagiri
2007-03-07 17:32 ` Srivatsa Vaddagiri
2007-03-07 17:43 ` Serge E. Hallyn
2007-03-07 17:46 ` Paul Menage
2007-03-07 23:16 ` Eric W. Biederman
2007-03-08 11:39 ` Srivatsa Vaddagiri
2007-03-07 18:00 ` Srivatsa Vaddagiri
2007-03-07 20:58 ` Serge E. Hallyn
2007-03-07 21:20 ` Paul Menage
2007-03-07 21:59 ` Serge E. Hallyn
2007-03-07 22:13 ` Dave Hansen
2007-03-07 23:13 ` Eric W. Biederman
2007-03-12 14:11 ` [ckrm-tech] " Srivatsa Vaddagiri
2007-03-07 22:32 ` Eric W. Biederman
2007-03-07 23:18 ` Paul Menage
2007-03-08 0:35 ` Sam Vilain
2007-03-08 0:42 ` Paul Menage
2007-03-08 0:53 ` Sam Vilain
2007-03-08 0:58 ` [ckrm-tech] " Paul Menage
2007-03-08 1:32 ` Eric W. Biederman
2007-03-08 1:35 ` Paul Menage
2007-03-08 2:25 ` Eric W. Biederman
2007-03-09 0:56 ` Herbert Poetzl
2007-03-09 0:53 ` Herbert Poetzl
2007-03-09 18:19 ` Srivatsa Vaddagiri
2007-03-09 19:36 ` Paul Jackson
2007-03-09 21:52 ` Herbert Poetzl
2007-03-09 22:06 ` Paul Jackson
2007-03-12 14:01 ` Srivatsa Vaddagiri
2007-03-12 15:15 ` Srivatsa Vaddagiri
2007-03-12 20:26 ` Paul Jackson
2007-03-09 4:30 ` Paul Jackson
2007-03-08 2:47 ` Sam Vilain
2007-03-08 2:57 ` Paul Menage
2007-03-08 3:32 ` Sam Vilain
2007-03-08 6:10 ` Matt Helsley
2007-03-08 6:44 ` Eric W. Biederman
2007-03-09 1:06 ` Herbert Poetzl
2007-03-10 9:06 ` Sam Vilain
2007-03-11 21:15 ` Paul Jackson
2007-03-12 9:35 ` Sam Vilain
2007-03-12 10:00 ` Paul Menage
2007-03-12 23:21 ` Herbert Poetzl
2007-03-13 2:25 ` Paul Menage
2007-03-13 15:57 ` Herbert Poetzl
2007-03-09 4:37 ` Paul Jackson
2007-03-08 6:32 ` Eric W. Biederman
2007-03-08 9:10 ` Paul Menage
2007-03-09 16:50 ` Serge E. Hallyn
2007-03-22 14:08 ` Srivatsa Vaddagiri
2007-03-22 14:39 ` Serge E. Hallyn
2007-03-22 14:56 ` Srivatsa Vaddagiri
2007-03-09 4:27 ` Paul Jackson
2007-03-10 8:52 ` Sam Vilain
2007-03-10 9:11 ` Paul Jackson
2007-03-09 16:34 ` Srivatsa Vaddagiri
2007-03-09 16:41 ` [ckrm-tech] " Srivatsa Vaddagiri
2007-03-09 22:09 ` Paul Menage
2007-03-10 2:02 ` Srivatsa Vaddagiri
2007-03-10 3:19 ` [ckrm-tech] " Srivatsa Vaddagiri
2007-03-12 15:07 ` Srivatsa Vaddagiri
2007-03-12 15:56 ` Serge E. Hallyn
2007-03-12 16:20 ` Srivatsa Vaddagiri
2007-03-12 17:25 ` Serge E. Hallyn
2007-03-12 21:15 ` Sam Vilain
2007-03-12 23:31 ` Herbert Poetzl
2007-03-13 2:22 ` Srivatsa Vaddagiri
2007-03-08 0:50 ` Sam Vilain
2007-03-08 11:30 ` Srivatsa Vaddagiri
2007-03-09 1:16 ` Herbert Poetzl
2007-03-09 18:41 ` Srivatsa Vaddagiri
2007-03-10 2:03 ` Herbert Poetzl
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