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Re: [PATCH v7 09/10] IPC: message queue copy feature introduced [message #48505 is a reply to message #48496]

Fri, 19 October 2012 00:52

ebiederm
Messages: 1354
Registered: February 2006

Senior Member

Stanislav Kinsbursky <skinsbursky@parallels.com> writes:

> It's not just an optimisation.
> If crtools will fail (with SIGSEGV, for instance), then queue will be empty.

Regardless of what you call the benefit of this enhancement, this
enhancement is not required to implement checkpoint/restart.

For reliability/restartability I suspect a simple enqueue/dequeue loop
over each message in the queue would be nearly as proof against SIGSEGV
and other failures.

So since all of these changes are enhancements we need to know what we
are getting, over just sticking with the existing interfaces.

Unless there is a real bottleneck for something to work, I suspect the
direction forward is to make checkpoint and restart work with the
existing kernel interfaces and then revisit that decision when you
actually have a real problem.

Eric

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[Message index]

		[PATCH v7 09/10] IPC: message queue copy feature introduced By: Stanislav Kinsbursky on Thu, 18 October 2012 10:23
		Re: [PATCH v7 09/10] IPC: message queue copy feature introduced By: Michael Kerrisk (man- on Thu, 18 October 2012 10:39
		Re: [PATCH v7 09/10] IPC: message queue copy feature introduced By: Stanislav Kinsbursky on Thu, 18 October 2012 11:02
		Re: [PATCH v7 09/10] IPC: message queue copy feature introduced By: Michael Kerrisk (man- on Thu, 18 October 2012 11:18
		Re: [PATCH v7 09/10] IPC: message queue copy feature introduced By: Stanislav Kinsbursky on Thu, 18 October 2012 11:34
		Re: [PATCH v7 09/10] IPC: message queue copy feature introduced By: Michael Kerrisk (man- on Thu, 18 October 2012 11:55
		Re: [PATCH v7 09/10] IPC: message queue copy feature introduced By: Stanislav Kinsbursky on Thu, 18 October 2012 12:05
		Re: [PATCH v7 09/10] IPC: message queue copy feature introduced By: Michael Kerrisk (man- on Thu, 18 October 2012 12:09
		Re: [PATCH v7 09/10] IPC: message queue copy feature introduced By: Stanislav Kinsbursky on Thu, 18 October 2012 12:41
		Re: [PATCH v7 09/10] IPC: message queue copy feature introduced By: ebiederm on Thu, 18 October 2012 12:20
		Re: [PATCH v7 09/10] IPC: message queue copy feature introduced By: ebiederm on Thu, 18 October 2012 11:52
		Re: [PATCH v7 09/10] IPC: message queue copy feature introduced By: Stanislav Kinsbursky on Thu, 18 October 2012 14:40
		Re: [PATCH v7 09/10] IPC: message queue copy feature introduced By: ebiederm on Fri, 19 October 2012 00:52
		Re: [PATCH v7 09/10] IPC: message queue copy feature introduced By: Stanislav Kinsbursky on Fri, 19 October 2012 07:44

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