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From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>,
	linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
	Frederic Weisbecker <fweisbec@gmail.com>,
	Yuanhan Liu <yuanhan.liu@linux.intel.com>,
	chris <chris@chris-wilson.co.uk>
Subject: Re: [PATCH][RFC] tracing: Enable tracepoints via module parameters
Date: Tue, 13 Aug 2013 18:34:53 -0400	[thread overview]
Message-ID: <20130813223453.GB15394@Krystal> (raw)
In-Reply-To: <20130813111442.632f3421@gandalf.local.home>

* Steven Rostedt (rostedt@goodmis.org) wrote:
[...]
> But the thing about this that bothers me is that there's no way to say,
> "Enable all tracepoints in this module on load". I would like a way to
> do that, but I don't know of a way to do that without modifying the
> module code. Have any ideas? Basically, I would love to have:
> 
> insmod foo tracepoints=all
> 
> or something and have all tracepoints enabled.

If it can help, here is a very similar scenario: tracepoints in
lttng-ust (user land) deal with dynamically loaded libraries that are
loaded at any point during program execution, which is very much similar
to the kernel module use-case discussed here.

The way a user interacts with lttng to enable, e.g. all tracepoints
within "app_component" would be:

lttng enable-event -u 'app_component:*'

Then, whenever a library containing tracepoints is loaded, the
tracepoints contained within the library are registered to lttng-ust,
and it enables all tracepoint matching the user-specified wildcard.

What I like about this approach, if applied to kernel modules, is that
it does not require users to interact with module load parameters to
specify which tracepoints should be enabled: this is all done through
the regular tracer UI, thus greatly improving user experience.

Thoughts ?

Thanks,

Mathieu

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com

  reply	other threads:[~2013-08-13 22:34 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-03-08 22:18 [PATCH][RFC] tracing: Enable tracepoints via module parameters Steven Rostedt
2011-03-08 22:42 ` Steven Rostedt
2011-03-08 23:22 ` Mathieu Desnoyers
2011-03-08 23:32   ` Steven Rostedt
2011-03-09  0:07     ` Mathieu Desnoyers
2011-03-09  0:14       ` Steven Rostedt
2011-03-09  0:29         ` Mathieu Desnoyers
2011-03-09  0:52           ` Steven Rostedt
2011-03-09  1:17             ` Mathieu Desnoyers
2011-03-09  2:01               ` Steven Rostedt
2011-03-09  2:30                 ` Mathieu Desnoyers
2011-03-09  2:01             ` Yuanhan Liu
2011-03-09  2:12               ` Steven Rostedt
2011-03-09  2:19                 ` Yuanhan Liu
2011-03-10 23:33 ` Rusty Russell
2013-08-13 15:14   ` Steven Rostedt
2013-08-13 22:34     ` Mathieu Desnoyers [this message]
2013-08-13 23:09       ` Steven Rostedt
2013-08-15  2:02     ` Rusty Russell
2013-08-15  3:32       ` Steven Rostedt
2021-04-19 21:54         ` Williams, Dan J
2021-04-19 22:11           ` Steven Rostedt
2021-04-20  1:25             ` Dan Williams
2021-04-20 12:55               ` Steven Rostedt
2021-04-20 13:29                 ` Mathieu Desnoyers
2021-04-20 14:55                   ` Steven Rostedt
2021-04-20 15:15                     ` Mathieu Desnoyers
2021-04-20 15:34                       ` Steven Rostedt
2021-04-20 19:54                 ` Dan Williams
2021-04-20 20:32                   ` Steven Rostedt
2021-04-21  6:27                     ` Dan Williams
2021-04-21  7:30                     ` Rasmus Villemoes
2021-04-21 14:20                       ` Steven Rostedt
2021-04-21 14:50                         ` Rasmus Villemoes
2021-04-21 15:00                           ` Steven Rostedt

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