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Date: Mon, 22 Aug 2016 15:16:15 -0400
From: Steven Rostedt <rostedt@goodmis.org>
To: Nilay Vaish <nilayvaish@gmail.com>
Cc: Linux Kernel list <linux-kernel@vger.kernel.org>,
        Ingo Molnar <mingo@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Clark Williams <williams@redhat.com>,
        Thomas Gleixner <tglx@linutronix.de>, Jon Masters <jcm@redhat.com>,
        Daniel Wagner <wagi@monom.org>, Carsten Emde <C.Emde@osadl.org>,
        Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
        Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH v2 1/4] tracing: Added hardware latency tracer
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On Mon, 22 Aug 2016 12:27:58 -0500
Nilay Vaish <nilayvaish@gmail.com> wrote:


> > +static void trace_hwlat_sample(struct hwlat_sample *sample)
> > +{
> > +       struct trace_array *tr = hwlat_trace;
> > +       struct trace_event_call *call = &event_hwlat;  
> 
> Steven, where is this variable event_hwlat declared?  To me it seems
> that some macro is declaring it (most likely DEFINE_EVENT) but I was
> not able to figure out the chain that ends up in the declaration.

Yeah, it's created similarly to how trace_events are created.

It's created via kernel/trace/trace_export.c using
kernel/trace/trace_entries.h

-- Steve