linux-kernel - Re: [PATCH v2 1/4] tracing: Added hardware latency tracer

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Date:   Mon, 22 Aug 2016 15:16:15 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Nilay Vaish <nilayvaish@...il.com>
Cc:     Linux Kernel list <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Clark Williams <williams@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jon Masters <jcm@...hat.com>, Daniel Wagner <wagi@...om.org>,
        Carsten Emde <C.Emde@...dl.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v2 1/4] tracing: Added hardware latency tracer

On Mon, 22 Aug 2016 12:27:58 -0500
Nilay Vaish <nilayvaish@...il.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