Re: Staircase test patch

[Peter Williams <pwil3058@bigpond.net.au>]

Con Kolivas wrote:
> On Saturday 01 April 2006 10:22, Peter Williams wrote:
>> Con Kolivas wrote:
>>> On Saturday 01 April 2006 07:31, Thorsten Will wrote:
>>>> On Friday 31 March 2006 23:07 +1000, Con Kolivas wrote:
>>>>> Hi Thorsten et al
>>>> Hi, Con.
>>>>
>>>>> Thorsten could you please test to see if this fixes the problem for
>>>>> you?
>>>> Oh boy, oh boy, oh boy.
>>>>
>>>> Against a bash loop:
>>>> |# dd bs=1M count=2048 </dev/hdb >/dev/null
>>>> |2048+0 records in
>>>> |2048+0 records out
>>>> |2147483648 bytes transferred in 35.497603 seconds (60496582 bytes/sec)
>>>>
>>>> Yes! Success! And the crowd goes wild! :-)
>>>>
>>>> I think you finally nailed it. Thank you so much!
>>> No, thank _you_ for bringing it to my attention and testing :)
>> Should I apply this to staircase in PlugSched?
> 
> I plan to make staircase v15 which is just this change, which would then need 
> to be resunc with plugsched. Unfortunately this needs code in 
> account_system_time which is not open to the schedulers in plugsched 
> currently so it needs more plugsched code to go in. I suspect other 
> schedulers may want to hook into this function, but I know you're currently 
> busy with smp nice to hack this in. I may look at doing it myself when I have 
> time if you don't have time.

OK.  I'm currently porting PlugSched to 2.6.16-mm2 which requires adding 
priority inheritance to each scheduler.  I'm modifying staircase and 
nicksched myself but would appreciate a code review after I release it.

Peter
-- 
Peter Williams                                   pwil3058@bigpond.net.au

"Learning, n. The kind of ignorance distinguishing the studious."
  -- Ambrose Bierce