* Event Tracing in the Linux kernel
@ 2022-03-02 14:37 David Kahurani
2022-03-02 14:53 ` Constantine Shulyupin
0 siblings, 1 reply; 4+ messages in thread
From: David Kahurani @ 2022-03-02 14:37 UTC (permalink / raw)
To: kernelnewbies
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Hello,
I have compiled a pretty recent Linux kernel mostly basing the
configuration on the older kernel.
I am now testing out the event tracing system but seem to be having a
problem.
Having enabled all events with
# echo *:* > /sys/kernel/debug/tracing/set_event
As described here [1], I expect that dmesg shows me some traces but there
aren't any. My dmesg logs are empty(just the same as with not having
enabled the events).
What could I be missing? Am I checking the wrong place for the trace? Are
there no tracepoints getting hit?
Any hits and pointers would be much appreciated.
Regards,
David
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* Re: Event Tracing in the Linux kernel
2022-03-02 14:37 Event Tracing in the Linux kernel David Kahurani
@ 2022-03-02 14:53 ` Constantine Shulyupin
2022-03-02 14:57 ` David Kahurani
0 siblings, 1 reply; 4+ messages in thread
From: Constantine Shulyupin @ 2022-03-02 14:53 UTC (permalink / raw)
To: David Kahurani; +Cc: kernelnewbies
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Please check
https://www.kernel.org/doc/html/latest/trace/events.html
On Wed, 2 Mar 2022 at 16:38, David Kahurani <k.kahurani@gmail.com> wrote:
> Hello,
>
> I have compiled a pretty recent Linux kernel mostly basing the
> configuration on the older kernel.
>
> I am now testing out the event tracing system but seem to be having a
> problem.
>
> Having enabled all events with
>
> # echo *:* > /sys/kernel/debug/tracing/set_event
>
> As described here [1], I expect that dmesg shows me some traces but there
> aren't any. My dmesg logs are empty(just the same as with not having
> enabled the events).
>
> What could I be missing? Am I checking the wrong place for the trace? Are
> there no tracepoints getting hit?
>
> Any hits and pointers would be much appreciated.
>
> Regards,
> David
>
>
>
>
>
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies@kernelnewbies.org
> https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>
--
Constantine Shulyupin
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Event Tracing in the Linux kernel
2022-03-02 14:53 ` Constantine Shulyupin
@ 2022-03-02 14:57 ` David Kahurani
2022-03-03 10:46 ` Donald Hunter
0 siblings, 1 reply; 4+ messages in thread
From: David Kahurani @ 2022-03-02 14:57 UTC (permalink / raw)
To: Constantine Shulyupin; +Cc: kernelnewbies
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Yes, I am using that reference but since no tracepoints are being hit, it
leaves me confused.
On Wed, Mar 2, 2022 at 5:53 PM Constantine Shulyupin <
constantine.shulyupin@gmail.com> wrote:
> Please check
> https://www.kernel.org/doc/html/latest/trace/events.html
>
> On Wed, 2 Mar 2022 at 16:38, David Kahurani <k.kahurani@gmail.com> wrote:
>
>> Hello,
>>
>> I have compiled a pretty recent Linux kernel mostly basing the
>> configuration on the older kernel.
>>
>> I am now testing out the event tracing system but seem to be having a
>> problem.
>>
>> Having enabled all events with
>>
>> # echo *:* > /sys/kernel/debug/tracing/set_event
>>
>> As described here [1], I expect that dmesg shows me some traces but there
>> aren't any. My dmesg logs are empty(just the same as with not having
>> enabled the events).
>>
>> What could I be missing? Am I checking the wrong place for the trace? Are
>> there no tracepoints getting hit?
>>
>> Any hits and pointers would be much appreciated.
>>
>> Regards,
>> David
>>
>>
>>
>>
>>
>>
>> _______________________________________________
>> Kernelnewbies mailing list
>> Kernelnewbies@kernelnewbies.org
>> https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>>
>
>
> --
> Constantine Shulyupin
>
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2022-03-02 14:37 Event Tracing in the Linux kernel David Kahurani
2022-03-02 14:53 ` Constantine Shulyupin
2022-03-02 14:57 ` David Kahurani
2022-03-03 10:46 ` Donald Hunter
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