[PATCH 11/11] smp: Move secondary CPU initialization request
gedare at rtems.org
Tue May 28 14:26:12 UTC 2013
Good. I'm glad to see the fixes being posted. We have accepted at
student to do SMP Scheduling work in GSOC. My goal is to get an actual
real-time SMP scheduler in place by the end of the SOC. I do not yet
know if it will be possible though since the scope of work may be
quite large, especially if we run into even more SMP bugs.
On Tue, May 28, 2013 at 3:28 AM, Sebastian Huber
<sebastian.huber at embedded-brains.de> wrote:
> On 05/27/2013 06:12 PM, Joel Sherrill wrote:
>> Are you sure it was a scheduling bug and not a dispatch disable nesting
>> problem? If the count does not go back to zero, then a blocked thread will
>> continue to execute.
> Yes, I am sure that it is a scheduling bug. I reach a state in which the
> executing task is not ready after the dispatch loop in _Thread_Dispatch().
>> If it is a bug I would like to know the detailed scenario so I can
>> reproduce it in the simulator.
> The bug can be reproduced with smptests/smp08 on Qemu.
> After the current patch set review and integration I will propose a new
> spinlock API. After that I am ready to commit the ARM SMP support with the
> existing scheduler. We can then look this problem more closely.
> I have a working alternative simple scheduler.
> 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.huber at embedded-brains.de
> PGP : Public key available on request.
> Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
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