linux-kernel - Re: [Ksummit-2010-discuss] checkpoint-restart: naked patch

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Date:	Wed, 17 Nov 2010 13:12:23 +0100
From:	Tejun Heo <tj@...nel.org>
To:	Kapil Arya <kapil@....neu.edu>
CC:	Gene Cooperman <gene@....neu.edu>,
	Oren Laadan <orenl@...columbia.edu>,
	ksummit-2010-discuss@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, hch@....de
Subject: Re: [Ksummit-2010-discuss] checkpoint-restart: naked patch

On 11/17/2010 11:45 AM, Tejun Heo wrote:
>> Since /proc/*/net provides a simpler design for sockets, we started
>> wondering what other simplifications may be possible. Here is one
>> possibility, in the case of shared file descriptors, DMTCP goes
>> through two barriers in order to decide which process will be
>> responsible for checkpointing which shared-file descriptor. It works
>> and the overhead is reasonable, but if you have additional
>> suggestion for this case, we would be very interested.
> 
> I wrote in another mail but you can find out which fd's are shared by
> flipping O_NONBLOCK and looking at the flags field of
> /proc/*/fdinfo/*.  Or are you talking about something else?

Ooh, one more thing, /proc/*/net/* has tx/rx queue counts.  With
those, you wouldn't need the cookie based connection draining, right?

Thanks.

-- 
tejun
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