[PATCH][0/3] Scheduler policies for staircase

[PATCH][0/3] Scheduler policies for staircase

[Con Kolivas]

These patches are not required to evaluate the staircase scheduler that is 
currently in mm2, so akpm you dont need to add these. However the users of 
the -ck patchset have been safely using the extra scheduling policies that 
these patches support. So this is for people to know they already exist and 
allow for wider testing.

The three patches that follow are:
schedrange - this makes it easier to implement more policies in code

schedbatch - this implements idle scheduling for close-to-weightless task 
scheduling which only schedules this class of task when nothing else wants 
to run. 

schediso - this implements soft real time scheduling for non-privileged 
tasks (isochronous scheduling).

patches are for 2.6.8-rc2-mm2
see each following patch for more details.

Con

Re: [PATCH][0/3] Scheduler policies for staircase

[Maciej Soltysiak]

Con,

I have been using SCHED_BATCH on two machines now with expected
results. So this you might consider this as another success report :-)

Do you think that these schedulers could come into the mainline
soon? Would you submit them to Linus without the staircase scheduler
or would you rather wait for the whole bunch of changes to get
rock-stable ?

Best regards,
Maciej

Re: [PATCH][0/3] Scheduler policies for staircase

[Takashi Iwai]

At Wed, 04 Aug 2004 10:40:26 +1000,
Con Kolivas wrote:
> 
> These patches are not required to evaluate the staircase scheduler that is 
> currently in mm2, so akpm you dont need to add these. However the users of 
> the -ck patchset have been safely using the extra scheduling policies that 
> these patches support. So this is for people to know they already exist and 
> allow for wider testing.
> 
> The three patches that follow are:
> schedrange - this makes it easier to implement more policies in code
> 
> schedbatch - this implements idle scheduling for close-to-weightless task 
> scheduling which only schedules this class of task when nothing else wants 
> to run. 
> 
> schediso - this implements soft real time scheduling for non-privileged 
> tasks (isochronous scheduling).

I'd love to see SCHED_ISO is introduced.
It helps the normal audio streaming.

(but not sure about the video streaming - what happens when the stream
handling is CPU bound?)


Takashi

Re: Scheduler policies for staircase

[Con Kolivas]

Takashi Iwai writes:

> At Wed, 04 Aug 2004 10:40:26 +1000,
> Con Kolivas wrote:
>> schediso - this implements soft real time scheduling for non-privileged 
>> tasks (isochronous scheduling).
> 
> I'd love to see SCHED_ISO is introduced.
> It helps the normal audio streaming.
> 
> (but not sure about the video streaming - what happens when the stream
> handling is CPU bound?)

I use "streamer" in sched iso mode, and do the video encoding in a separate 
application (mencoder) through a pipe. So it's a simple threading issue 
where the capture thread is run in sched iso, and the cpu bound encoding 
sched normal.

Cheers,
Con