Message-ID: <49E424A3.60606@cs.columbia.edu>
Date: Tue, 14 Apr 2009 01:52:35 -0400
From: Oren Laadan <orenl@cs.columbia.edu>
Organization: Columbia University
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To: "Serge E. Hallyn" <serue@us.ibm.com>
CC: Alexey Dobriyan <adobriyan@gmail.com>, akpm@linux-foundation.org,
       containers@lists.linux-foundation.org, xemul@parallels.com,
       dave@linux.vnet.ibm.com, mingo@elte.hu, hch@infradead.org,
       torvalds@linux-foundation.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 10/30] cr: core stuff
References: <20090410023539.GK27788@x200.localdomain> <20090413214701.GA24509@us.ibm.com>
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Hi,

Serge E. Hallyn wrote:
> Quoting Alexey Dobriyan (adobriyan@gmail.com):
> 
> Hi Alexey,
> 
> as far as I can see, the main differences between this patch and the
> equivalent in Oren's tree are:
> 
> 1. kernel auto-selects container init to freeze

Actually, this eliminates the possibility to checkpoint a subtree of
tasks, which (under some obvious constraints) can be a handy feature.

> 2. kernel freezes tasks

IMHO better to do it in userspace - that way userspace can accomplish
other tasks while tasks are frozen, such as snapshot the filesystem,
or block/unblock the network.

Is there a good argument to do it kernel ?

> 3. no objhash taking references
> 4. no hbuf
> 5. always require CAP_SYS_ADMIN

I'm now convinced (thanks, Serge!) that it's better not to require
this unless we strictly have to.

Oren.


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