linux-kernel - [PATCH 0/2] tracing: Add a way to have custom events in the tracefs directory

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Message-ID: <20220302032414.503960863@goodmis.org>
Date:   Tue, 01 Mar 2022 22:24:14 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org
Cc:     Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Tom Zanussi <zanussi@...nel.org>
Subject: [PATCH 0/2] tracing: Add a way to have custom events in the tracefs directory

We would like to have in production a way to record sched wakeups and
sched switch, and be able to save the information in a small file
with as much available as possible. Currently the wake up and sched switch
events are 36 and 64 bytes each (plus a 4 byte ring buffer event header).

By having a custom module tap into the sched switch and waking trace points
we can bring those events down to 16 and 14 bytes respectively.

Steven Rostedt (Google) (2):
      tracing: Allow custom events to be added to the tracefs directory
      tracing: Add sample code for custom trace events

----
 kernel/trace/trace_events.c               |   2 +
 samples/Kconfig                           |   8 +-
 samples/Makefile                          |   1 +
 samples/trace_events/Makefile             |   2 +
 samples/trace_events/trace_custom_sched.c | 280 ++++++++++++++++++++++++++++++
 5 files changed, 292 insertions(+), 1 deletion(-)
 create mode 100644 samples/trace_events/trace_custom_sched.c