Messages in this thread | | | Date | Fri, 19 Aug 2005 11:05:02 +0100 | From | Jon Escombe <> | Subject | Re: [Hdaps-devel] Re: HDAPS, Need to park the head for real |
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>>>>Please make it "echo 1 > frozen", then userspace can do "echo 0 > frozen" >>>>after five seconds. >>>> >>>> >>>What if the code to do "echo 0 > frozen" is swapped out to disk? ;) >>> >>> >>Emergency head parker needs to be pagelocked for other reasons. You do >>not want to page it from disk while your notebook is in free fall. >> >> > >It's still a very bad idea imho, what if the head parker daemon is >killed for other reasons? The automatic timeout thawing the drive is >much saner. > > For hard disk protection, I prefer the idea of the userspace code thawing the drive based on current accelerometer data, rather than simply waking up after x seconds (maybe you're running for a bus rather than falling off a table)...
To get the best of both worlds, could we maybe take a watchdog timer approach, and have the timeout reset by the userspace component periodically re-requesting freeze?
Regards, Jon.
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