linux-kernel - Re: [RFC v7][PATCH 2/9] General infrastructure for checkpoint restart

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Message-ID: <20081022025513.GA7504@caradoc.them.org>
Date:	Tue, 21 Oct 2008 22:55:13 -0400
From:	Daniel Jacobowitz <dan@...ian.org>
To:	Oren Laadan <orenl@...columbia.edu>
Cc:	"Serge E. Hallyn" <serue@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	torvalds@...ux-foundation.org,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-api@...r.kernel.org, tglx@...utronix.de,
	dave@...ux.vnet.ibm.com, mingo@...e.hu, hpa@...or.com,
	viro@...iv.linux.org.uk
Subject: Re: [RFC v7][PATCH 2/9] General infrastructure for checkpoint
	restart

On Tue, Oct 21, 2008 at 09:33:19PM -0400, Oren Laadan wrote:
> >> What happens if I pass it a pid of a process which I _do_ own, but it
> >> does not refer to a container's init process?
> > 
> > I would assume that do_checkpoint() would return -EINVAL, but it's a
> > great question:  Oren, did you have another plan?
> 
> Since we intentional provide minimal functionality to keep the patchset
> simple and allow easy review - we only checkpoint one task; it doesn't
> really matter because we don't deal with the entire container.
> 
> With the ability to checkpoint multiple process we will have to ensure
> that we checkpoint an entire container. I planned to return -EINVAL if
> the target task isn't a container init(1). Another option, if people
> prefer, is to use any task in a container to "represent" the entire
> container.

I haven't been following - but why this whole container restriction?
Checkpoint/restart of individual processes is very useful too.
There are issues with e.g. IPC, but I'm not convinced they're
substantially different than the issues already present for a
container.

-- 
Daniel Jacobowitz
CodeSourcery
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