On Mon, Apr 18, 2005 at 05:37:09PM +0900, Takashi Ikebe wrote:
> As you said, if we can migrate the data to new process without
> stopping service, it is OK, but the real applications need to
> takeover data very much(sometimes it's over gigabyte....depends on
> service, and causes service disruption...).
man mmap
man 5 ipc
> So, live patching seems reasonable to us.
That still doesn't tell me why it's necessary to do something so
complicated
> 2. Activate the patch modules with pannus -a command.
> - stop the target process and check current instruction not to conflict.
> - if it is not conflict, overwrite the jump assembly to function's
> entrypoiny where you want to fix, to patch module's one.
> - restart the process.
there is a still a stop/start here
why not just hand the state of to a different process? how is that
slower?
> Will this be answer??
maybe, but i'm far from convinced it's necessary and therefore
warrants a big ugly kernel patch
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