Re: PATCH : LEDs - possibly the most pointless kernel subsystem ever

[Eli Carter <eli.carter@inet.com>]

John Bradford wrote:
>>>This patch adds an abstraction layer for programmable LED devices,
>>>hardware drivers for the Status LEDs found on some Intel PIIX4E based
>>>server hardware (notably the ISP1100 1U rackmount server) and LEDs wired
>>>to the parallel port data lines.
>>
>>I haven't had chance to test this yet, but I really like the idea - by
>>an amasing co-incidence, I was actually thinking about the possibility
>>of doing a parallel port connected front panel earlier today!
>>
>>Does anybody have any suggestions for recommended standard uses for
>>parallel port connected LEDs?
>>
>>Disk spinning up/disk ready
>>Root login active
>>
>>Any other suggestions?
> 
> 
> Ah, I just thought, for debugging purposes we could have LEDs for:
> 
> * BKL taken
> * Servicing interrupt
> * Kernel stack usage > 2K

Maybe also:
  * 100% CPU usage
  * Toggle each jiffie (help detect interrupts disabled)
  * User control for things like cpu/harddrive temp...
  * and of course, Morse code ;)

Have fun,

Eli
--------------------. "If it ain't broke now,
Eli Carter           \                  it will be soon." -- crypto-gram
eli.carter(a)inet.com `-------------------------------------------------