Re: perf probe an addr without debuginfo

[Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>]

On 2015/06/30 0:00, Arnaldo Carvalho de Melo wrote:
> Em Sun, Jun 28, 2015 at 05:46:51PM +0200, Benjamin King escreveu:
>> Hi Brendan
>>
>>> Is there a trick to getting perf to probe a user-level address without
>>> debuginfo? Eg (on Linux 4.0):
>>> [...]
>>> I can do this using ftrace ok, eg, "p:tick_0x583 /root/tick:0x583"
>>> works. Thanks,
>>
>> Not quite what you have asked for, but you can add the probe via ftrace and
>> then use it from perf. Probes from /sys/kernel/debug/tracing/uprobe_events
>> will show up in 'perf list' as well.
> 
> Masami,
> 
> 	Is this already possible?

Yes, it should be possible. However, I don't recommend you to
probe the address inside a function without debuginfo. You must
check the instruction boundary in that case.

> 
> - Arnaldo
> 
> P.S.: If you're not subscribed to this list, please consider it :-)

Oh, I didn't know the list! I will.
Thanks!

> 


-- 
Masami HIRAMATSU
Linux Technology Research Center, System Productivity Research Dept.
Center for Technology Innovation - Systems Engineering
Hitachi, Ltd., Research & Development Group
E-mail: masami.hiramatsu.pt@hitachi.com