linux-kernel - Re: HP accelerometer driver: testers wanted

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Message-ID: <20090123152235.GA23668@elf.ucw.cz>
Date:	Fri, 23 Jan 2009 16:22:36 +0100
From:	Pavel Machek <pavel@...e.cz>
To:	Frans Pop <elendil@...net.nl>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: HP accelerometer driver: testers wanted

Hi!

> Minor issue in the patch: hpfall.c should not be executable:
> -rwxr-xr-x 1 fjp fjp  1759 2009-01-22 23:31 hpfall.c

Hmm, fixed in my local tree, but will have to think about how to make
it into patch.

> > Run hpfall, and see if LED lights and disk parks if you "drop" a
> > computer. (*)
> 
> $ sudo ./hpfall &
> 
> The LED lights up yellow, but I have problems telling if the disk gets 
> parked or not. One time I got a green led and seemingly a fair amount of 
> activity immediately after getting the yellow led.
> 
> After looking at hpfall.c, I checked /sys/block/sda/device/unload_heads 
> after a drop:
> $ cat /sys/block/sda/device/unload_heads
> 19616
> $ cat /sys/block/sda/device/unload_heads
> 0

Ok, so drop detection works for you; good. I could see disk activity
stopping during find / ...

> Wouldn't it be good to have locks/unlocks registered in the logs when
> /sys/block/sda/device/unload_heads changes (assuming the actual write will 
> get delayed until the head is unparked)?

That would fill the logs rather quickly, right?
								Pavel
-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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