linux-kernel - Re: [PATCH] tracing/power: Don't share template for cpu_idle and cpu

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Date:   Tue, 13 Feb 2018 08:20:24 +0800
From:   "Du, Changbin" <changbin.du@...el.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     "Du, Changbin" <changbin.du@...el.com>, mingo@...hat.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tracing/power: Don't share template for cpu_idle and
 cpu_frequency

Thanks, I will improve this change in v2. And also update related docs.

On Mon, Feb 12, 2018 at 12:04:52PM -0500, Steven Rostedt wrote:
> On Sun, 11 Feb 2018 18:50:04 +0800
> "Du, Changbin" <changbin.du@...el.com> wrote:
> 
> > Steve, How abount DEFINE_EVENT_PRINT as below?
> 
> Yes, DEFINE_EVENT_PRINT is better.
> 
> > 
> > diff --git a/include/trace/events/power.h b/include/trace/events/power.h
> > index 908977d..e71ce98 100644
> > --- a/include/trace/events/power.h
> > +++ b/include/trace/events/power.h
> > @@ -14,12 +14,12 @@
> > 
> >  DECLARE_EVENT_CLASS(cpu,
> > 
> > -       TP_PROTO(unsigned int state, unsigned int cpu_id),
> > +       TP_PROTO(int state, unsigned int cpu_id),
> > 
> >         TP_ARGS(state, cpu_id),
> > 
> >         TP_STRUCT__entry(
> > -               __field(        u32,            state           )
> > +               __field(        s32,            state           )
> >                 __field(        u32,            cpu_id          )
> >         ),
> > 
> > @@ -28,13 +28,12 @@ DECLARE_EVENT_CLASS(cpu,
> >                 __entry->cpu_id = cpu_id;
> >         ),
> > 
> > -       TP_printk("state=%lu cpu_id=%lu", (unsigned long)__entry->state,
> > -                 (unsigned long)__entry->cpu_id)
> 
> Yous still need the type casting, because s32/u32 on 32 bit machines
> can be defined as "long".
> 
> -- Steve
> 
> > +       TP_printk("state=%d cpu_id=%u", __entry->state, __entry->cpu_id)
> >  );
> > 
> >  DEFINE_EVENT(cpu, cpu_idle,
> > 
> > -       TP_PROTO(unsigned int state, unsigned int cpu_id),
> > +       TP_PROTO(int state, unsigned int cpu_id),
> > 
> >         TP_ARGS(state, cpu_id)
> >  );
> > @@ -141,11 +140,13 @@ TRACE_EVENT(pstate_sample,
> >                 { PM_EVENT_RESTORE, "restore" }, \
> >                 { PM_EVENT_RECOVER, "recover" })
> > 
> > -DEFINE_EVENT(cpu, cpu_frequency,
> > +DEFINE_EVENT_PRINT(cpu, cpu_frequency,
> > 
> > -       TP_PROTO(unsigned int frequency, unsigned int cpu_id),
> > +       TP_PROTO(int state, unsigned int cpu_id),
> > 
> > -       TP_ARGS(frequency, cpu_id)
> > +       TP_ARGS(state, cpu_id),
> > +
> > +       TP_printk("frequency=%u cpu_id=%lu", __entry->state, __entry->cpu_id)
> >  );
> 

-- 
Thanks,
Changbin Du