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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Hi all,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">My main objective was to have a way to run the rtems testsuite and have a script auto-compare the results with the corresponding scn file.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Currently, just because core0 starts core1, seems like core1 always starts Init(), all results are flipped, thus this process cannot be automated.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Functionality wise, everything runs as expected, I verified individually each core with the debugger, so I am ok with it.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Also, this issue comes up in a different form also when the applications exits, because core1 (that had started Init(), exits with the expected return code, while
all other cores terminate with RTEMS_FATAL_SOURCE_SMP/SMP_FATAL_SHUTDOWN_RESPONSE, which is handled as an error at the moment from the debugger/loader. For the moment I have added a fatal extension handler to avoid this case, but I am still looking if there
is any better solution.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Best Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> Stavros<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><a name="_____replyseparator"></a><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> users [mailto:users-bounces@rtems.org]
<b>On Behalf Of </b>Joel Sherrill<br>
<b>Sent:</b> Monday, August 20, 2018 5:39 PM<br>
<b>To:</b> Sebastian Huber <sebastian.huber@embedded-brains.de><br>
<b>Cc:</b> rtems-users@rtems.org <users@rtems.org><br>
<b>Subject:</b> Re: SMP related question<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Mon, Aug 20, 2018 at 1:23 AM, Sebastian Huber <<a href="mailto:sebastian.huber@embedded-brains.de" target="_blank">sebastian.huber@embedded-brains.de</a>> wrote:<o:p></o:p></p>
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<br>
On 12/08/18 00:41, Chris Johns wrote:<o:p></o:p></p>
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<p class="MsoNormal">On 10/08/2018 22:30, Sebastian Huber wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Hello Stavros,<br>
<br>
you can do this with a custom clustered scheduler configuration:<br>
<br>
<a href="https://docs.rtems.org/branches/master/c-user/configuring_a_system.html#clustered-scheduler-configuration" target="_blank">https://docs.rtems.org/branches/master/c-user/configuring_a_system.html#clustered-scheduler-configuration</a><o:p></o:p></p>
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<p class="MsoNormal">I had a brief look over the documentation you provided but could not see how to<br>
achieve the result you are saying.<o:p></o:p></p>
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<p class="MsoNormal"><br>
Stavros, asked for two things.<br>
<br>
1. A way to change properties of the initialization task which are not covered by configuration options<br>
<br>
<a href="https://docs.rtems.org/branches/master/c-user/configuring_a_system.html#classic-api-initialization-tasks-table-configuration" target="_blank">https://docs.rtems.org/branches/master/c-user/configuring_a_system.html#classic-api-initialization-tasks-table-configuration</a><br>
<br>
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.<o:p></o:p></p>
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<p class="MsoNormal">The high priority constructor is too late if the goal is to avoid any activity except core 0.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="background:white">RTEMS_SYSINIT_ITEM() would work but adding a confdefs.h item for SMP configurations to pin the thread to a single core seems like a simple solution.</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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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.<o:p></o:p></p>
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<p class="MsoNormal">I think being able to pin the Init thread to a single core would be a nice confdefs.h feature. Not specifying a full cpuset, just the core number. <o:p></o:p></p>
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<p class="MsoNormal">I don't think this use case is enough by itself to force a user to clustered scheduling with core 0 an instance by itself.<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Alternatively, on a recent version the default SMP scheduler supports a one-to-one affinity. You can set it in a device driver.<o:p></o:p></p>
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<p class="MsoNormal">Is there an example of how to do this?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">As Sebastian points out, you can't do it in a device driver. But no, there is no example specifically for the Init thread.<o:p></o:p></p>
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<p class="MsoNormal">There are smptests which do this but likely no proper example of setting affinity, scheduler, etc.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">--joel<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><br>
Chris<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">----- Am 10. Aug 2018 um 14:10 schrieb Passas, Stavros
<a href="mailto:stavros.passas@intel.com" target="_blank">stavros.passas@intel.com</a>:<o:p></o:p></p>
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<p class="MsoNormal">Hi,<br>
<br>
In my local SMP enabled RTEMS, I notice core1 starting the Init() function of<br>
the user application.<br>
Is there a way to enforce RTEMS to run the Init() in the boot processor, when<br>
SMP is enabled?<br>
<br>
Best Regards,<br>
Stavros<br>
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<p class="MsoNormal" style="margin-bottom:12.0pt">_______________________________________________<br>
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<p class="MsoNormal">_______________________________________________<br>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span class="hoenzb"><span style="color:#888888">-- </span></span><span style="color:#888888"><br>
<span class="hoenzb">Sebastian Huber, embedded brains GmbH</span><br>
<br>
<span class="hoenzb">Address : Dornierstr. 4, D-82178 Puchheim, Germany</span><br>
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<br>
<span class="hoenzb">Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.</span></span><o:p></o:p></p>
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<p class="MsoNormal"><br>
<br>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p>--------------------------------------------------------------<br>
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Registered in Ireland<br>
Registered Office: Collinstown Industrial Park, Leixlip, County Kildare<br>
Registered Number: 308263</p>
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