Linux-Trace-Users Archive on lore.kernel.org
 help / color / Atom feed
From: ahmadkhorrami <ahmadkhorrami@ut.ac.ir>
To: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: linux-trace-users <linux-trace-users@vger.kernel.org>,
	lttng-dev <lttng-dev@lists.lttng.org>,
	Jeremie Galarneau <jeremie.galarneau@efficios.com>,
	Namhyung Kim <namhyung@kernel.org>, rostedt <rostedt@goodmis.org>,
	linux-trace-users-owner@vger.kernel.org
Subject: Re: Capturing User-Level Function Calls/Returns
Date: Thu, 16 Jul 2020 02:09:50 +0430
Message-ID: <98de6fe15a816d8f06ba3d5df0f10540@ut.ac.ir> (raw)
In-Reply-To: <83963025.14828.1594838718290.JavaMail.zimbra@efficios.com>

Hi Steven and Mathieu,
Firstly, many thanks! This method seems to be the most efficient method. 
But, IIUC, what you suggest requires source code compilation. I need an 
efficient dynamic method that, given the function address, captures its 
occurrence and stores some information from the execution context. Is 
there anything better than Uprobes perhaps with no trap into the kernel? 
Why do we need traps?
Regards.

On 2020-07-15 23:15, Mathieu Desnoyers wrote:

> ----- On Jul 15, 2020, at 2:28 PM, rostedt rostedt@goodmis.org wrote:
> 
> On Wed, 15 Jul 2020 20:37:16 +0430
> ahmadkhorrami <ahmadkhorrami@ut.ac.ir> 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:

https://lttng.org/docs/#doc-liblttng-ust-cyg-profile

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:

https://lttng.org/docs/#doc-enabling-disabling-channels

Thanks,

Mathieu

> 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

  reply index

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-15 16:07 ahmadkhorrami
2020-07-15 18:28 ` Steven Rostedt
2020-07-15 18:45   ` Mathieu Desnoyers
2020-07-15 21:39     ` ahmadkhorrami [this message]
2020-07-15 21:48       ` Steven Rostedt
2020-07-15 22:25         ` ahmadkhorrami
2020-07-16  1:06         ` [lttng-dev] " Michel Dagenais
2020-07-16  1:49           ` Frank Ch. Eigler
2020-07-16 16:26             ` ahmadkhorrami
2020-07-16 16:20           ` ahmadkhorrami
2020-07-16 16:34           ` ahmadkhorrami
2020-07-16  1:04   ` Namhyung Kim
2020-07-16 16:07     ` ahmadkhorrami

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=98de6fe15a816d8f06ba3d5df0f10540@ut.ac.ir \
    --to=ahmadkhorrami@ut.ac.ir \
    --cc=jeremie.galarneau@efficios.com \
    --cc=linux-trace-users-owner@vger.kernel.org \
    --cc=linux-trace-users@vger.kernel.org \
    --cc=lttng-dev@lists.lttng.org \
    --cc=mathieu.desnoyers@efficios.com \
    --cc=namhyung@kernel.org \
    --cc=rostedt@goodmis.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-Trace-Users Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-trace-users/0 linux-trace-users/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-trace-users linux-trace-users/ https://lore.kernel.org/linux-trace-users \
		linux-trace-users@vger.kernel.org
	public-inbox-index linux-trace-users

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-trace-users


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git