[RFC][PATCH 8/8] check files for checkpointability

Dave Hansen dave at linux.vnet.ibm.com
Mon Mar 2 08:27:31 PST 2009

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 at us.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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