From: "Jan Kiszka" <jan.kiszka@siemens.com>
To: cip-dev@lists.cip-project.org, Rainer Kloud <rainer.kloud@abwesend.de>
Subject: Re: [cip-dev] BUG: using smp_processor_id() in preemptible [00000000] code: TCPTSK/1809
Date: Mon, 7 Jun 2021 10:25:22 +0200 [thread overview]
Message-ID: <458aad5e-5455-e290-5ee1-f5eb78fb5c5e@siemens.com> (raw)
In-Reply-To: <trinity-17b11b5f-9805-4527-89fb-1f3a0103a164-1623043418611@3c-app-gmx-bap15>
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Hi Rainer,
On 07.06.21 07:23, Rainer Kloud wrote:
> Hello Pavel,
>
>> I notice you are using -rt kernel. Do you actually need realtime
>> features?
>
> Yes, I actually need the realtime feature. I have one task which
> needs to run periodically in realtime (triggered every 10ms by an
> external IRQ).
>
Please don't forget to share your kernel config with us so that we can
make sure your use case is covered subsystem-wise in CIP. From Siemens
side, we still have room for improvements in this regard, even more on -rt.
> Jun 1 09:11:46 sicam kernel: [46802.944299] [<c062f854>] (dump_stack) from [<c03a57ec>] (check_preemption_disabled+0x110/0x114)
> Jun 1 09:11:46 sicam kernel: [46802.944316] [<c03a57ec>] (check_preemption_disabled) from [<c014163c>] (migrate_enable+0x40/0x488)
> Jun 1 09:11:46 sicam kernel: [46802.944338] [<c014163c>] (migrate_enable) from [<c053ff0c>] (ip_finish_output2+0x21c/0x460)
Migration should be on across migration-disabled sections, that's their
whole purpose. But maybe the check that preemption needs to be off when
using smp_processor_id needs relaxing to at least migration must be off.
Jan
--
Siemens AG, T RDA IOT
Corporate Competence Center Embedded Linux
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next prev parent reply other threads:[~2021-06-07 8:34 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-05 13:50 [cip-dev] BUG: using smp_processor_id() in preemptible [00000000] code: TCPTSK/1809 Rainer Kloud
2021-06-06 19:14 ` Pavel Machek
2021-06-07 4:31 ` rainer.kloud
2021-06-07 5:23 ` Rainer Kloud
2021-06-07 8:25 ` Jan Kiszka [this message]
2021-06-07 10:18 ` Rainer Kloud
2021-06-10 5:33 ` Jan Kiszka
2021-06-11 22:34 ` Pavel Machek
2021-06-15 4:56 ` Rainer Kloud
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