[ltt-dev] Another question on sys_futex

[ltt-dev] Another question on sys_futex

[Gian Lorenzo Meocci]

Hi all,

I have another problem. If I look in the LTTng (using lttv) I obtain
something like this:

kernel_syscall_entry: 2059926.457278322 (/tmp/trace1/cpu_0), 22193,
22155, ./fftw, , 22189, 0x0, SYSCALL { ip = 0xffffe424, syscall_id =
240 [sys_futex+0x0/0x120] }

This is a sys_futex call entry, but I don't know if op is a FUTEX_WAIT
or FUTEX_WAKE. What can I do to obtain this information?

thanks again,

-- 
Ing. Gian Lorenzo Meocci
http://www.meocci.it

[ltt-dev] Another question on sys_futex

[Mathieu Desnoyers]

* Gian Lorenzo Meocci (glmeocci at gmail.com) wrote:
> Hi all,
> 
> I have another problem. If I look in the LTTng (using lttv) I obtain
> something like this:
> 
> kernel_syscall_entry: 2059926.457278322 (/tmp/trace1/cpu_0), 22193,
> 22155, ./fftw, , 22189, 0x0, SYSCALL { ip = 0xffffe424, syscall_id =
> 240 [sys_futex+0x0/0x120] }
> 
> This is a sys_futex call entry, but I don't know if op is a FUTEX_WAIT
> or FUTEX_WAKE. What can I do to obtain this information?
> 

I guess you'll have to start adding markers in the futex code as a
temporary solution to extract this information.

Mathieu

> thanks again,
> 
> -- 
> Ing. Gian Lorenzo Meocci
> http://www.meocci.it
> 
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-- 
Mathieu Desnoyers
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