Subject: Re: [Devel] Re: [RFC] libcg: design and plans
From: "Denis V. Lunev" <den@parallels.com>
To: Paul Menage <menage@google.com>
Cc: Dhaval Giani <dhaval@linux.vnet.ibm.com>, fedora-devel-list@redhat.com,
       opensuse-packaging@opensuse.org,
       Peter Zijlstra <a.p.zijlstra@chello.nl>,
       containers@lists.linux-foundation.org,
       Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>,
       lkml <linux-kernel@vger.kernel.org>,
       Sudhir Kumar <skumar@linux.vnet.ibm.com>
In-Reply-To: <6599ad830803042215n6aedb3eeub0c037e6a4e7bb34@mail.gmail.com>
References: <20080304152341.GB5659@linux.vnet.ibm.com>
	 <6599ad830803042215n6aedb3eeub0c037e6a4e7bb34@mail.gmail.com>
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Organization: Parallels
Date: Wed, 05 Mar 2008 10:17:47 +0300
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On Tue, 2008-03-04 at 22:15 -0800, Paul Menage wrote:
> Hi Dhaval,
> 
> On Tue, Mar 4, 2008 at 7:23 AM, Dhaval Giani <dhaval@linux.vnet.ibm.com> wrote:
> > Hi,
> >
> >  We have been working on a library for control groups which would provide
> >  simple APIs for programmers to utilize from userspace and make use of
> >  control groups.
> >
> >  We are still designing the library and the APIs. I've attached the
> >  design (as of now) to get some feedback from the community whether we
> >  are heading in the correct direction and what else should be addressed.
> 
> There are a few things that it would be nice to include in such a
> library, if you're going to develop one:
> 
> - the ability to create abstract groups of processes, and resource
> groups, and have the ability to tie these together arbitrarily. E.g
> you might create abstract groups A, B and C, and be able to say that A
> and B share memory with each other but not with C, and all three
> groups are isolated from each other for CPU. Then libcg would mount
> different resource types in different cgroup hierarchies (you would
> probably tell it ahead of time which combinations of sharing you would
> want, in order that it could minimize the number of mounted
> hierarchies). When you tell libcg to move a process into abstract
> group A, it would move it into the appropriate resource group in each
> hierarchy.

There is one more important thing. In addition to the processes you must
unite or provide a way to unite other objects like sockets. This is
needed to create a group-based socket buffer management.

The mapping between socket and a process does not exists right now and,
we can have (virtually), sockets from from different namespaces in one
process.

Regards,
    Den

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