no longer
preempt it. And you can manage the SF threads to be any value you want relative
to 50 anyway without having to manage commit_work itself.
I'm not sure if you have problems with RT tasks preempting important CFS
tasks. My brain registered two conflicting statements
On 10/06/20 13:04, Rob Clark wrote:
> On Tue, Oct 6, 2020 at 3:59 AM Qais Yousef wrote:
> >
> > On 10/05/20 16:24, Rob Clark wrote:
> >
> > [...]
> >
> > > > RT planning and partitioning is not easy task for sure. You might want
> > > >
so, but I'm not 100% sure if they are showing up in
If you ever get a chance to run a high network throughput test, it might help
to see if softirqs are affecting you. I know Android has issues with this under
some circumstances.
> traces. So far it seems like SF stomping on commit_work. (There is
> the added complication that there are some chrome gpu-process tasks in
> between SF and the display, including CrGpuMain (which really doesn't
> want to be SCHED_FIFO when executing gl commands on behalf of
> something unrelated to the compositor.. the deadline approach, IIUC,
> might be the better option eventually for this?)
If you meant sched_deadline + token approach, then yeah I think it'd be better.
But as you said, we can't do this yet :/
But as Peter pointed out, this doesn't mean you can't use SCHED_DEADLINE at all
if it does make sense.
Thanks
--
Qais Yousef
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+CC Steve and Peter - they might be interested.
On 10/02/20 11:07, Rob Clark wrote:
> On Fri, Oct 2, 2020 at 4:01 AM Qais Yousef wrote:
> >
> > On 09/30/20 14:17, Rob Clark wrote:
> > > From: Rob Clark
> > >
> > > The android userspace treats
line critical section lock such that any
task holding it will automatically be promoted to SCHED_FIFO and then demoted
to CFS once it releases it.
Haven't worked with display pipelines before, so hopefully this makes sense :-)
Thanks
--
Qais Yousef
>
> To handle this, convert non-blocking
t a sneaky application names its threads to match
this regex and get a free promotion to RT without having the capability to do
so?
Cheers
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out-fences and/or sending
> pageflip events, it could probably work ok to use a single priority
> level for both commit-work and vblank-work.
This is a function of num_cpus too. As long as nr_cpus > nr_running_rt_tasks
you should be fine.
Cheers
--
Qais Yousef
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