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From: Brian Hutchinson via lttng-dev <lttng-dev@lists.lttng.org>
To: lttng-dev@lists.lttng.org
Subject: [lttng-dev] Trying to understand use of lttng enable-event --kernel --userspace-probe=
Date: Tue, 16 May 2023 22:11:01 -0400	[thread overview]
Message-ID: <CAFZh4h8C5ZVHGWsBW2iaVYi56t=SsmuiSGZPLf0KpQO9LwfeMQ@mail.gmail.com> (raw)

Hi,

I'm trying to figure out how to use uprobes with lttng.

I can't use a normal uprobe for a line number just using the address I
want to probe obtained from objdump?  As in:

echo 'p /usr/local/bin/my_app:0x2c3a8' >>
/sys/kernel/debug/tracing/uprobe_events

... which isn't a function entry, it's just a line of code I want to probe on.

This link says it has to be elf or sdt:
https://lttng.org/man/1/lttng-enable-event/v2.11/#doc-opt--userspace-probe

So can I not probe on just a line of code by specifying an address???

It doesn't look like these methods above will do what I'm wanting to
do.  I've tried to find examples of using enable-event --kernel
--userspace-probe= but there doesn't appear to be many.

Thanks,

Brian
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             reply	other threads:[~2023-05-17  2:12 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-05-17  2:11 Brian Hutchinson via lttng-dev [this message]
2023-05-17 16:08 ` Mathieu Desnoyers via lttng-dev
2023-05-17 16:37   ` Brian Hutchinson via lttng-dev
2023-05-17 17:17     ` Mathieu Desnoyers via lttng-dev
2023-05-18 13:17   ` Brian Hutchinson via lttng-dev
2023-05-18 14:10     ` Brian Hutchinson via lttng-dev
2023-05-18 14:46       ` Mathieu Desnoyers via lttng-dev
2023-05-18 15:00         ` Brian Hutchinson via lttng-dev
2023-05-18 18:58           ` Brian Hutchinson via lttng-dev
2023-05-18 19:03             ` Mathieu Desnoyers via lttng-dev
2023-05-18 19:07               ` Brian Hutchinson via lttng-dev
2023-05-18 19:16                 ` Mathieu Desnoyers via lttng-dev
2023-05-18 19:28                   ` Brian Hutchinson via lttng-dev
2023-05-18 19:20                 ` Brian Hutchinson via lttng-dev
2023-05-18 19:24                   ` Mathieu Desnoyers via lttng-dev
2023-05-18 19:32                     ` Brian Hutchinson via lttng-dev

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