SMP related question

[Sebastian Huber]

On 12/08/18 00:41, Chris Johns wrote:
> On 10/08/2018 22:30, Sebastian Huber wrote:
>> Hello Stavros,
>>
>> you can do this with a custom clustered scheduler configuration:
>>
>> https://docs.rtems.org/branches/master/c-user/configuring_a_system.html#clustered-scheduler-configuration
>>
> I had a brief look over the documentation you provided but could not see how to
> achieve the result you are saying.

Stavros, asked for two things.

1. A way to change properties of the initialization task which are not covered by configuration options

https://docs.rtems.org/branches/master/c-user/configuring_a_system.html#classic-api-initialization-tasks-table-configuration

before the initialization task runs. To do this some user provided code must execute after the initialization task is created and before it runs. My suggestion to use a device driver initialization function for this doesn't work. The initialization task is created after the device driver initialization. It can be done via a system initialization handler using the undocumented RTEMS_SYSINIT_ITEM(). Maybe also a high priority constructor, however, in this case the task already runs.

2. A way to pin a task to a particular processor. There are two options to do this in RTEMS. One is a clustered scheduler configuration, the other is the use of a thread to processor affinity.

>
>> Alternatively, on a recent version the default SMP scheduler supports a one-to-one affinity.  You can set it in a device driver.
> Is there an example of how to do this?
>
> Chris
>
>> ----- Am 10. Aug 2018 um 14:10 schrieb Passas, Stavros stavros.passas at intel.com:
>>
>>> Hi,
>>>
>>> In my local SMP enabled RTEMS, I notice core1 starting the Init() function of
>>> the user application.
>>> Is there a way to enforce RTEMS to run the Init() in the boot processor, when
>>> SMP is enabled?
>>>
>>> Best Regards,
>>>    Stavros
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Sebastian Huber, embedded brains GmbH

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