linux-kernel - Re: [RFC][PATCH 8/8] check files for checkpointability

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Message-Id: <1236011251.26788.450.camel@nimitz>
Date:	Mon, 02 Mar 2009 08:27:31 -0800
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Nathan Lynch <ntl@...ox.com>
Cc:	"Serge E. Hallyn" <serue@...ibm.com>,
	containers <containers@...ts.linux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	hch@...radead.org, Ingo Molnar <mingo@...e.hu>,
	Alexey Dobriyan <adobriyan@...il.com>
Subject: Re: [RFC][PATCH 8/8] check files for checkpointability

On Mon, 2009-03-02 at 09:59 -0600, Nathan Lynch wrote:
> On Mon, 2 Mar 2009 07:37:54 -0600
> "Serge E. Hallyn" <serue@...ibm.com> wrote:
> > So on a practical note, Ingo's scheme appears to be paying off.  In
> > order for any program's files_struct to be checkpointable right now,
> > it must be statically compiled, else ld.so (I assume) looks up
> > /proc/$$/status.  So since proc is not checkpointable, the result
> > is irreversibly non-checkpointable.
> > 
> > So...  does it make sense to mark proc as checkpointable?  Do we
> > reasonably assume that the same procfile will be available at
> > restart?
> 
> With respect to /proc/$x/* where $x is the pid the restarted task wants,
> is that not a chicken-and-egg problem?

Do you mean that we have to go look into /proc to figure out which task
we want before we can checkpoint it?  That makes the process *doing* the
checkpoint uncheckpointable, but no the process being examined.

Anyway, I'll fix /proc.  It is pretty important.

-- Dave

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