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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