On 17/10/2018 09:20, Chris Johns wrote:
On 17/10/18 5:17 pm, Sebastian Huber wrote:
On 17/10/2018 07:59, Chris Johns wrote:
On 17/10/18 4:05 pm, Sebastian Huber wrote:
On 17/10/2018 02:46, Chris Johns wrote:
On 16/10/2018 19:34, Sebastian Huber wrote:
On 16/10/2018 10:28, jameszxj wrote:
CPU:zynq z7020 RTEMS version: master version
SMP define:
#define CONFIGURE_MAXIMUM_PROCESSORS 2
#if 1
#define CONFIGURE_MAXIMUM_PRIORITY 255
#define CONFIGURE_SCHEDULER_PRIORITY_SMP
The only SMP scheduler supported by libbsd is:
#define CONFIGURE_SCHEDULER_EDF_SMP
Why does the restriction exist?
This SMP scheduler implementation is the only one in RTEMS that supports thread
pinning. It is the default scheduler.
The documentation says:
In case no explicit clustered scheduler configuration is present, then it
is used as the scheduler for exactly one processor.
You mean
https://docs.rtems.org/branches/master/c-user/configuring_a_system.html#configure-scheduler-edf
?
Yes.
I do not know what this means.
I think the wording is clear. It describes the CONFIGURE_SCHEDULER_EDF
configuration option.
I read it as ... "if I do not provide a clustered scheduler config then EDF is
used for just a single processor so if I have more than one processor something
else is used on that but what is the something else" .. but I am not sure.
No, you are here in the description of the CONFIGURE_SCHEDULER_EDF
configuration option. It describes what happens if you do a
#define CONFIGURE_SCHEDULER_EDF
I see the default is mentioned just after this. I
wonder if a section about the defaults in either 24.21 and/or 24.22?
The section 24.21 is about the general scheduler configuration. This
configuration is optional. Maybe we should clarify this in the section entry.
Yes, I think this needs to be front and center somewhere. It makes sense once
you understand however we should help new users coming on board with RTEMS.
The section 24.22 is about the clustered scheduler configuration. This
configuration is also optional.
Yes and it has the default scheduler comment.
The clustered scheduling section has:
A clustered scheduler configuration is optional. By default, up to 32
processors are managed by the EDF SMP Scheduler.
It is not clear if the default is 32 processors, the scheduler or both.
By default means if you didn't configure anything.
What about ...
A clustered scheduler configuration is optional. If configured the default
scheduler, up to 32 processors, is the EDF SMP Scheduler.
I think the "If configured" is very confusing. The EDF SMP scheduler is
used if you don't configure anything except
CONFIGURE_MAXIMUM_PROCESSORS. This is what most users should do.
I will try to create a documentation patch.
--
Sebastian Huber, embedded brains GmbH
Address : Dornierstr. 4, D-82178 Puchheim, Germany
Phone : +49 89 189 47 41-16
Fax : +49 89 189 47 41-09
E-Mail : sebastian.hu...@embedded-brains.de
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Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
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