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SubjectRe: [PATCH v5 0/2] perf probe: add sdt probes arguments into the uprobe cmd string
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On Wednesday 14 December 2016 01:06 PM, Ingo Molnar wrote:
> * Alexis Berlemont <alexis.berlemont@gmail.com> wrote:
>
>> Hi Masami,
>>
>> Many thanks for your mail.
>>
>> Here is another patch set which tries to fix the points you mentioned:
>>
>> * Skip the arguments containing a constant ($123);
>> * Review the code in charge of the register renaming (search for '%'
>> and parse it);
>> * Minor changes (print the argument in case of error, skipping, check
>> the sdt arg type index);
>>
>> Many thanks,
>>
>> Alexis.
>>
>> Alexis Berlemont (2):
>> perf sdt: add scanning of sdt probles arguments
>> perf probe: add sdt probes arguments into the uprobe cmd string
> I'd like to hijack this thread to report an SDT oddity - one of my boxen reports
> lots of SDT tracepoints in 'perf list':
>
> mem:<addr>[/len][:access] [Hardware breakpoint]
>
> sdt_libc:lll_lock_wait_private [SDT event]
> sdt_libc:longjmp [SDT event]
> sdt_libc:longjmp_target [SDT event]
> sdt_libc:memory_arena_new [SDT event]
> sdt_libc:memory_arena_retry [SDT event]
> sdt_libc:memory_arena_reuse [SDT event]
> sdt_libc:memory_arena_reuse_free_list [SDT event]
> sdt_libc:memory_arena_reuse_wait [SDT event]
> sdt_libc:memory_calloc_retry [SDT event]
> sdt_libc:memory_heap_free [SDT event]
> ...
>
> But none of them work:
>
> Error: No permissions to read /sys/kernel/debug/tracing/events/sdt_libc/longjmp
> Hint: Try 'sudo mount -o remount,mode=755 /sys/kernel/debug/tracing'
>
> ...
>
> Error: File /sys/kernel/debug/tracing/events/sdt_libc/longjmp not found.
> Hint: Perhaps this kernel misses some CONFIG_ setting to enable this feature?.
>
> What kind of patches are required for SDT probes to work?

Hi Ingo,

Works for me on my x86 Fedora 25 box. May be some permission issue?

@Alexis, Planning to progress on it :) ? I would like to prepare patch for
powerpc.

Thanks,
Ravi

> Thanks,
>
> Ingo
>

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