Messages in this thread | | | Date | Mon, 11 Aug 2008 17:14:33 -0600 | From | Jonathan Corbet <> | Subject | Re: checkpoint/restart ABI |
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On Mon, 11 Aug 2008 23:47:49 +0200 Arnd Bergmann <arnd@arndb.de> wrote:
> The other problem that you really need to solve is interface > stability. What you are creating is a binary representation > of many kernel internal data structures, so in our common > rules, you have to make sure that you remain forward and > backward compatible. Simply saying that you need to run > an identical kernel when restarting from a checkpoint is not > enough IMHO.
OTOH, making one of these checkpoint files go into any 2.6.x kernel seems like a very high bar, to the point, perhaps, of killing this feature entirely.
There could be a case for viewing sys_restore() as being a lot like sys_init_module() - a view into kernel internals that goes beyond the normal user-space ABI, and beyond the stability guarantee. It might be possible to create a certain amount of version portability with a modversions-like mechanism, but it sure seems hard to do better than that.
jon
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