Messages in this thread | | | From | Arnd Bergmann <> | Subject | Re: [RFC][PATCH 1/4] checkpoint-restart: general infrastructure | Date | Sat, 9 Aug 2008 08:37:07 +0200 |
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On Saturday 09 August 2008, Dave Hansen wrote: > On Sat, 2008-08-09 at 00:39 +0200, Arnd Bergmann wrote: > > The main problem I see with that would be atomicity: If you want multiple > > processes to keep interacting with each other, you need to save them at > > the same point in time, which gets harder as you split your interface into > > more than a single file descriptor. > > It could take ages to write out a checkpoint even to a single fd, so I > suspect we'd have the exact same kinds of issues either way.
I guess either way, you have to SIGSTOP (or similar) all the tasks you want to checkpoint atomically before you start saving the contents. If you use a single fd, you can do that under the covers, when using a more complex file system, it seems more logical to require an explicit interface for this.
Arnd <><
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