Re: [PATCH 1/2] SDT markers listing by perf

From: Masami Hiramatsu
Date: Wed Sep 25 2013 - 04:45:44 EST

(2013/09/25 15:03), Hemant wrote:
>>> I have one doubt here. Why do we need [ARG ...] in the syntax you
>>> specified? I believe these args are to fetched from the sdt notes'
>>> section of the elf of the executable/library. Or am I taking this in a
>>> wrong way and this suggested syntax is actually for the uprobe_events
>>> file in the tracing directory?
>> Hm, indeed. Since all the arguments of the marker is defined in sdt notes,
>> we actually don't need to specify each of them. However, other probe syntax
>> has those arguments. I'd like to keep the same syntax style in the
>> same command (action) for avoiding confusion.
> Hmm, got it.
>> I recommend this way; at the first step, we just find the marker address from
>> sdt. And next, we will make the argument available. And eventually,
>> it is better to introduce "$args" meta argument to fetch all the arguments
>> of the marker.
>> At this point, we can do
>> perf probe %foo:bar $args
> So, at first step (ignoring the arguments), we can go with :
> perf probe %foo:bar


> And, once, the argument support is enabled (all the arguments will be
> fetched at the marker location), we can go with:
> perf probe %foo:bar $args

Correct ;). In my plan, $parms and $vars will be also introduced for
accessing all function parameters and local variables correspondingly.

Thank you!

IT Management Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory

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