DragonFly BSD
DragonFly kernel List (threaded) for 2003-09
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Re: checkpoint/restart milestone 1

To: Kip Macy <kmacy@xxxxxxxxxxx>
From: Hiten Pandya <hmp@xxxxxxxxxxxxx>
Date: Mon, 15 Sep 2003 02:33:56 +0100

Kip Macy wrote:
: way. This provides you with functionality for doing that. So if your
: program/computer crashes the program can just restart from the last time
: it did a checkpoint.
: This could also be useful for debugging as well. If you have an
: application that starts doing something weird, you can just checkpoint
: it and send the checkpoint off to the developer.

	Ah, sounds good!  I looked into this idea some time ago, when
	you can suspend a process, store it's state in an image file
	and then you can use it whenever you want for reloading it

	The only issue I had with such kind of thing was to do with the
	state that the kernel keeps, like file descriptor tables, and
	vnode references, which are invalidated after a reboot, because
	a new table is created.

	One way to solve this problem was to index into the filedesc
	table and make out which files were open, save this information
	in some sort part of the process image, and then when the
	image is loaded, we recreate references to the files originally
	referenced; although, this is just an overall perspective on the
	topic.  I am sure there were other roadblocks which I faced.

Anyway, this sounds ilke a really good idea! :-)


Hiten Pandya

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