linux-kernel - Re: Nested events with zero deltas, can use absolute timestamps instead?

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Message-ID: <20190524115428.2bf41725@gandalf.local.home>
Date:   Fri, 24 May 2019 11:54:28 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Jason Behmer <jbehmer@...gle.com>
Cc:     tom.zanussi@...ux.intel.com, linux-kernel@...r.kernel.org
Subject: Re: Nested events with zero deltas, can use absolute timestamps
 instead?

On Fri, 24 May 2019 08:48:44 -0700
Jason Behmer <jbehmer@...gle.com> wrote:

> Sorry, I'm not sure I follow.  By new tracing option do you mean a new
> option in the timestamp_mode file?  I guess in that case would that
> still be the only writable option?  You could write 1/0 to the file
> which would turn on/off force_absolute_timestamps, and reading the
> file would show which of absolute, delta, and force_absolute was set?
> Or did you mean something else by tracing option?

I mean the options in tracefs/options/*

Do a search for OVERWRITE in kernel/trace/ and see what it does.

-- Steve