From: Steven Rostedt <rostedt@goodmis.org>
To: Claudio <claudio.fontana@gliwa.com>
Cc: Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
linux-kernel@vger.kernel.org
Subject: Re: ftrace performance (sched events): cyclictest shows 25% more latency
Date: Fri, 6 Jul 2018 17:39:22 -0400 [thread overview]
Message-ID: <20180706173922.734616de@gandalf.local.home> (raw)
In-Reply-To: <20180706172428.30aeef91@gandalf.local.home>
On Fri, 6 Jul 2018 17:24:28 -0400
Steven Rostedt <rostedt@goodmis.org> wrote:
> I'll investigate further.
Note, I enabled function tracing to trace the scheduler function:
# trace-cmd start -p function -l schedule
And then ran cyclictest. That does not cause any noticeable increase
in latency (try it). So there is some kind of side effect with the
trace event itself, and not the recording of the event.
-- Steve
next prev parent reply other threads:[~2018-07-06 21:39 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-06 6:22 Claudio
2018-07-06 21:24 ` Steven Rostedt
2018-07-06 21:39 ` Steven Rostedt [this message]
2018-07-06 22:00 ` Steven Rostedt
2018-07-09 10:06 ` Claudio
2018-07-09 14:53 ` Claudio
2018-07-09 15:11 ` Steven Rostedt
2018-07-09 15:32 ` Steven Rostedt
2018-07-24 9:58 ` ftrace global trace_pipe_raw Claudio
2018-07-24 14:23 ` Steven Rostedt
2018-07-24 14:25 ` Steven Rostedt
2018-07-24 15:30 ` Claudio
2018-12-19 11:32 ` Claudio
2018-12-19 16:37 ` Steven Rostedt
2019-01-16 8:00 ` Claudio
2019-01-16 13:47 ` Steven Rostedt
2018-07-24 9:59 ` Claudio
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