* [Xenomai-core] FYI: CONFIG_PERF_EVENTS conflicts with Xenomai shadows
@ 2010-03-31 13:50 Jan Kiszka
2010-03-31 16:53 ` Jan Kiszka
0 siblings, 1 reply; 2+ messages in thread
From: Jan Kiszka @ 2010-03-31 13:50 UTC (permalink / raw)
To: xenomai-core; +Cc: adeos-main
Hi,
just ran into an ugly warning of I-pipe as I happened to have
CONFIG_PERF_EVENTS enabled in 2.6.32 kernel. That pulls some plain Linux
spinlock into the finish_task_switch path.
We should either disable this feature at I-pipe level or patch it
properly. Haven't checked yet if the latter is feasible with moderate
effort, though.
Jan
--
Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [Xenomai-core] FYI: CONFIG_PERF_EVENTS conflicts with Xenomai shadows
2010-03-31 13:50 [Xenomai-core] FYI: CONFIG_PERF_EVENTS conflicts with Xenomai shadows Jan Kiszka
@ 2010-03-31 16:53 ` Jan Kiszka
0 siblings, 0 replies; 2+ messages in thread
From: Jan Kiszka @ 2010-03-31 16:53 UTC (permalink / raw)
To: xenomai-core; +Cc: adeos-main
Jan Kiszka wrote:
> Hi,
>
> just ran into an ugly warning of I-pipe as I happened to have
> CONFIG_PERF_EVENTS enabled in 2.6.32 kernel. That pulls some plain Linux
> spinlock into the finish_task_switch path.
>
> We should either disable this feature at I-pipe level or patch it
> properly. Haven't checked yet if the latter is feasible with moderate
> effort, though.
>
At least this one is now explainable: There is no problem related to
CONFIG_PERF_EVENTS. finish_task_switch is not part of the critical
shadow task switch, and the oops I saw finally turned out to be caused
by my buggy virtual hardware (IOW: an unrelated hypervisor bug). Nothing
to worry about for Xenomai or I-pipe.
Jan
--
Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux
^ permalink raw reply [flat|nested] 2+ messages in thread
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2010-03-31 13:50 [Xenomai-core] FYI: CONFIG_PERF_EVENTS conflicts with Xenomai shadows Jan Kiszka
2010-03-31 16:53 ` Jan Kiszka
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