Re: IBM HDAPS things are looking up (was: Re: [Hdaps-devel] Re: [ltp] IBM HDAPS Someone interested? (Accelerometer))

Shawn Starr
2005-07-04T14:27:49Z

We could put it in userspace, but if the system is
swapping like mad, can we still get a critical
response if this remains in userspace fully?

Someone mentioned we should use a kernel thread(s) to
handle stopping all I/O so we can safely park heads.

Shawn.

--- Jens Axboe <axboe@suse.de> wrote:

> On Mon, Jul 04 2005, Lenz Grimmer wrote:
> > > I'll be working on adding sysfs stuff to it
> tomorrow so it's generally
> > > useful (at least for monitoring things - not yet
> for parking disk
> > > heads).
> >
> > Maybe there is some kind of all-purpose ATA
> command that instructs the
> > disk drive to park the heads? Jens, could you give
> us a hint on how a
> > userspace application would do that?
>
> Dunno if there's something that explicitly only
> parks the head, the best
> option is probably to issue a STANDBY_NOW command.
> You can test this
> with hdparm -y.
>
> Generel observation on this driver - why isn't it
> just contained in user
> space? You need to do the monitoring and sending of
> ide commands from
> there anyways, I don't see the point of putting it
> in the kernel.
>
> --
> Jens Axboe
>
>
>
>
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