On Fri, Aug 19 2005, Jon Escombe wrote: > > >>>>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?
That would work, you can just define the semantics to be that echo foo > frozen would add foo seconds to the timeout (or thaw it, if foo is 0). -- Jens Axboe - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
