Re: [PATCH 2/2] trace-cmd: Add ftrace options with fgraph retval option

[Steven Rostedt <rostedt@goodmis.org>]

On Fri, 17 May 2024 11:50:29 -0700
Jianfeng Wang <jianfeng.w.wang@oracle.com> wrote:

> > Honestly, I don't think this should be an option. Or if it is, it
> > should be default on. If the retval exists in the trace, it should just
> > be printed. Why ask the user to show it when they spent the time to
> > enable it in the recording?
> > 

> 
> I make it a default-off option because the feature changes the output format of
> the 'trace-cmd report'. So to be on the safe side, keep the original format by
> default. Also, the kernel has options (i.e., options/funcgraph-retval and
> options/funcgraph-retval-hex) to enable printing functions' retval in trace.log
> 
> >From my point of view, I'd like to see the retval on by default. If you are  
> okay, I'd like to make it default on and add an option to display retval in hex.

Yeah, we can keep both as an option, but make the retval default on.

It will not change default behavior, as it should only be shown if retval
was recorded in the first place. If it wasn't recorded, the behavior should
be the same regardless of if the retval option is enabled or not in the
trace-cmd output.

-- Steve