[yocto] A question on adding a new program to a new meta layer

[Bruce Ashfield]

On 13-03-09 5:32 AM, Insop Song wrote:
> On Fri, Mar 8, 2013 at 3:35 PM, Bruce Ashfield
> <bruce.ashfield at windriver.com>  wrote:
>> On 13-03-08 12:01 PM, Darren Hart wrote:
>>>
>>>
>>>
>>> On 03/04/2013 08:04 PM, Insop Song wrote:
>>>>
>>>> Hi,
>>>>
>>>> I am preparing a new meta layer for testing and promoting a
>>>> sched_deadline scheduler, called "meta-dl". I am planning to add
>>>> scheduler testing tools and different kernel versions as well.
>>>> - http://insop.github.com/meta-dl/
>>>
>>>
>>> Note that qemux86 doesn't support the EMGD graphics driver. You mention
>>> this and its license in the README, but it isn't necessary. If you are
>>> pulling that in, there is a problem with your recipes.
>>
>>
>> wow. mailing list delays are making this conversation *extremely*
>> painful and disjointed.
>>
>>
> Darren,
> Those that you've mentioned were from yocto kernel lab examples.
> I went over and cleaned them up. https://github.com/insop/meta-dl
>
> However, at this point, I am more looking at meta-realtime that uses
> yocto-linux-3.8 instead as Bruce's suggestion.
> https://github.com/insop/meta-realtime


Expect that the yocto project hosted meta-realtime will appear in a
week or so. I'm doing the legwork at the moment, but with some travel
in the upcoming week, the initial push will be delayed by a few days.

Cheers,

Bruce

>
>
>>>
>>> So you are using the sched_deadline patches, but not PREEMPT_RT, is that
>>> right? I had always assumed sched_deadline ran on top of PREEMPT_RT (but
>>> I haven't every tried building it myself).
>>
>>
>> sched_deadline applies to mainline, right on top of CFS as a scheduler
>> class. So in fact, I wouldn't suggest it with preempt-rt at all at the
>> moment.
>>
>>
>
> Right, previously, Juri maintained sched_deadline on top of
> preempt-rt, but not any more.
>
>>>
>>> What you have here is a good experimental layer. Looking forward, please
>>> consider:
>>>
>>> o Incorporating sched_deadline as a kernel feature into the
>>> linux-yocto_3.8 kernel. We can easily add recipes to build a
>>> linux-yocto-deadline kernel and you will get all the benefits of the
>>> yocto tooling, testing, bugfixing, and free forward porting.
>>
>>
>> Already done. I've had it in linux-yocto-3.8 since I first introduced
>> it. We just need the supporting userspace to easily change the
>> scheduler class for a process.
>>
>>
>
> Yup, two apps that can test sched_deadline is at meta-realtime now.
> I will prepare some script to make it easier as well.
>
>>>
>>> o Incorporating your tests into (poky|oe-core)/meta/recipes-rt
>>
>>
>> Or if they aren't fully 'core', our new meta-realtime that I'd like
>> to have created shortly.
>>
>
> I will be playing with meta-realtime at github until you create one.
> Please let me know if you have any other requested program on this layer.
>
> Regards,
>
> Insop