Re: [PATCH 1/3] ftrace: graph of a single function

From: Ingo Molnar
Date: Thu Dec 04 2008 - 03:40:30 EST



* Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:

>
> On Wed, 3 Dec 2008, Andrew Morton wrote:
>
> > On Wed, 3 Dec 2008 16:10:38 -0500 (EST)
> > Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:
> > > > > +
> > > > > + seq_printf(m, "%s\n", str);
> > > >
> > > > Can we use %pF here?
> > >
> > > If there's a way to not print the "+offset".
> >
> > Could be added, I guess. I wonder if it would be
> > reused elsewhere.
>
> There's lots of places in ftrace that would use it, and probably clean
> up a bunch of code in the process.

Well, we do eventually want to have a trace_option that extends all
function names with the +offset/size portion - and one that switches them
to raw RIPs.

In rare occasions, when the same function has multiple call sites of the
same child function, it can be useful. I ran into such scenarios with the
latency tracer and it had this capability to do 'verbose' symbol
printing.

So plain %pF wont cut it - please abstract out the "print function symbol
string" bit within the ftrace infrastructure.

And the default trace_option for this should be to print without
+offset/size spam, emphatically :)

Ingo
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