Re: Capturing User-Level Function Calls/Returns

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----- On Jul 15, 2020, at 2:28 PM, rostedt rostedt@xxxxxxxxxxx wrote:

> On Wed, 15 Jul 2020 20:37:16 +0430
> ahmadkhorrami <ahmadkhorrami@xxxxxxxx> wrote:
>> Hi,
>> What is the most efficient way to capture occurrence of a function
>> call/return of a binary program in userspace?
>> It seems the answer is Uprobes. 1) Am I right?
>> But Uprobes use "int" instruction which leads to a switch into kernel
>> mode. 2) Wouldn't it be better to avoid this transition?
>> I'm looking forward to your reply and will be happy to read your
>> opinions.
>> Regards.
> Hi, I believe LTTng has utilities that can help you trace user space
> programs.

Indeed, it is documented here:

If your program is generating function entry/exit at a very
high rate (which goes beyond your available I/O throughput and
lasts longer than the memory you have available for ring buffers),
you will also probably want to use the "blocking-timeout" option
documented at:



> I think there's also a users ftrace like utility that Namhyung was
> working on. But I don't know where in the development that is.
> -- Steve

Mathieu Desnoyers
EfficiOS Inc.

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