Re: [PATCH 2/4] tracing: add trace_export support for event trace

[tingwei]

On 2020-07-22 00:37, Steven Rostedt wrote:
> On Mon, 20 Jul 2020 10:21:15 +0800
> Tingwei Zhang <tingwei@xxxxxxxxxxxxxx> wrote:
>
> > Only function traces can be exported to other destinations currently.
> > This patch exports event trace as well.
> >
> > Signed-off-by: Tingwei Zhang <tingwei@xxxxxxxxxxxxxx>
> > ---
> >  kernel/trace/trace.c | 24 +++++++++++++-----------
> >  1 file changed, 13 insertions(+), 11 deletions(-)
> >
> > diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
> > index bb62269724d5..aef6330836e2 100644
> > --- a/kernel/trace/trace.c
> > +++ b/kernel/trace/trace.c
> > @@ -2697,17 +2697,6 @@ int tracepoint_printk_sysctl(struct ctl_table
> *table, int write,
> >  	return ret;
> >  }
> >
> > -void trace_event_buffer_commit(struct trace_event_buffer *fbuffer)
> > -{
> > -	if (static_key_false(&tracepoint_printk_key.key))
> > -		output_printk(fbuffer);
> > -
> > -	event_trigger_unlock_commit_regs(fbuffer->trace_file,
> fbuffer->buffer,
> > -				    fbuffer->event, fbuffer->entry,
> > -				    fbuffer->flags, fbuffer->pc,
> fbuffer->regs);
> > -}
> > -EXPORT_SYMBOL_GPL(trace_event_buffer_commit);
> > -
>
> Please move the ftrace_exports routines up, instead of moving the
> trace_event_buffer_commit() down. As it fits better where it is (next
> to the other buffer_commit code).
>
> -- Steve

Thanks, Steve. I'll fix this.

> >  /*
> >   * Skip 3:
> >   *
> > @@ -2868,6 +2857,19 @@ int unregister_ftrace_export(struct
> > trace_export *export) }
> >  EXPORT_SYMBOL_GPL(unregister_ftrace_export);
> >
> > +void trace_event_buffer_commit(struct trace_event_buffer *fbuffer)
> > +{
> > +	if (static_key_false(&tracepoint_printk_key.key))
> > +		output_printk(fbuffer);
> > +
> > +	if (static_branch_unlikely(&ftrace_exports_enabled))
> > +		ftrace_exports(fbuffer->event);
> > +	event_trigger_unlock_commit_regs(fbuffer->trace_file,
> > fbuffer->buffer,
> > +				    fbuffer->event, fbuffer->entry,
> > +				    fbuffer->flags, fbuffer->pc,
> > fbuffer->regs); +}
> > +EXPORT_SYMBOL_GPL(trace_event_buffer_commit);
> > +
> >  void
> >  trace_function(struct trace_array *tr,
> >  	       unsigned long ip, unsigned long parent_ip, unsigned
> > long flags,