linux-kernel - Enable histograms for events/ftrace/timerlat and osnoise

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Message-ID: <ead16e4f-a05b-8b76-e1e6-52223effd6c5@redhat.com>
Date:   Fri, 24 Mar 2023 17:13:31 +0100
From:   Daniel Bristot de Oliveira <bristot@...hat.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Masami Hiramatsu <mhiramat@...nel.org>,
        Tom Zanussi <zanussi@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Enable histograms for events/ftrace/timerlat and osnoise

Hi Steven

I would like to collect histograms from timerlat and osnoise tracers event,
but I cannot collect them because they are not tracepoints but... tracer
events. So...

  # ls /sys/kernel/tracing/events/ftrace/timerlat/
  format	hist

no hist, filter, trigger files...

How hard would it be to enable histograms to the ftrace/osnoise and
ftrace/timerlat events?

This will allow me to reduce the overhead of rtla timerlat and rtla osnoise
tools...

Thanks in advance, Stephen!
-- Denny