[PATCH 8/8] score: Add scheduler assignments for SMP

[Gedare Bloom]

On Mon, Apr 14, 2014 at 9:15 AM, Sebastian Huber
<sebastian.huber at embedded-brains.de> wrote:
> On 2014-04-12 07:44, Gedare Bloom wrote:
>>
>> I'm having some concerns that this way of configuring a system may be
>> overly complex, and once we "commit" to it we will be stuck with the
>> complexity of this approach. Please consider some ways to simplify the
>> user-level interface for scheduler configuration.
>>
>> I suppose this is part and parcel of RTEMS configuration in general,
>> but the amount of extra logic required here beyond the usual approach
>> in RTEMS of setting maximum constraints has me troubled.
>
>
> I don't think the configuration is overly complex.  It is
> clustered/partitioned scheduling itself that is complex.
>
> A configure option like
>
> #define CONFIGURE_THE_CLUSTERED_SCHEDULERS_HOW_I_NEED_IT
>
> is beyond the capabilities of the current C pre-processor ;-)
>
> I updated the configuration documentation with a more detail example.  I
> think its pretty easy to configure it.
>
I'd consider something more along the lines of the following as quite
a bit easier to use:
#define CONFIGURE_SCHEDULER_THAT_I_WANT(tag, name, mandatory_cores,
optional_cores)

Using the example from the new patch, everything between
RTEMS_SCHEDULER_CONTEXT_PRIORITY_SMP through the end of the assignment
table would become:

#define CONFIGURE_SCHEDULER_PRIORITY_SMP(io, rtems_build_name('I',
'O', ' ', ' '), 0x1, 0x0)
#define CONFIGURE_SCHEDULER_PRIORITY_SMP(work, rtems_build_name('W',
'O', 'R', 'K'), 0x0c, 0xf0)
or even
#define CONFIGURE_SCHEDULER(THAT_I_WANT, tag, name, mandatory, optional)
so the user can specify the scheduler as part of the macro parameters.

The CONFIGURE_SCHEDULER() macro then "explodes" into the rest of the
macros, and you can use #if statements to check the bit fields
specified in mandatory and optional, hidden from view of the user.

Gedare

>
> --
> Sebastian Huber, embedded brains GmbH
>
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