Re: [Hdaps-devel] Re: HDAPS, Need to park the head for real

[Jon Escombe]

> > > > 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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