Re: [RFC v7][PATCH 0/9] Kernel based checkpoint/restart

From: Ingo Molnar
Date: Wed Oct 22 2008 - 05:20:59 EST

* Dave Hansen <dave@xxxxxxxxxxxxxxxxxx> wrote:

> On Tue, 2008-10-21 at 12:21 -0700, Andrew Morton wrote:
> > On Mon, 20 Oct 2008 01:40:28 -0400
> > Oren Laadan <orenl@xxxxxxxxxxxxxxx> wrote:
> > > These patches implement basic checkpoint-restart [CR]. This version
> > > (v7) supports basic tasks with simple private memory, and open files
> > > (regular files and directories only).
> >
> > - how useful is this code as it stands in real-world usage?
> Right now, an application must be specifically written to use these
> mew system calls. It must be a single process and not share any
> resources with other processes. The only file descriptors that may be
> open are simple files and may not include sockets or pipes.
> What this means in practice is that it is useful for a simple app
> doing computational work.

say a chemistry application doing calculations. Or a raytracer with a
large job. Both can take many hours (days!) even on very fast machine
and the restrictions on rebootability can hurt in such cases.

You should reach a minimal level of initial practical utility: say some
helper tool that allows testers to checkpoint and restore a real PovRay
session - without any modification to a stock distro PovRay.

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