linux-kernel - Re: [PATCH] ftrace: Add a C/P state tracer to help power optimization

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Message-ID: <c62985530811250325h63ba1a08j610eb0be5ed73a45@mail.gmail.com>
Date:	Tue, 25 Nov 2008 12:25:51 +0100
From:	"Frédéric Weisbecker" <fweisbec@...il.com>
To:	"Arjan van de Ven" <arjan@...radead.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, rostedt@...dmis.org
Subject: Re: [PATCH] ftrace: Add a C/P state tracer to help power optimization

That looks good...

2008/11/24 Arjan van de Ven <arjan@...radead.org>:
> diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
> index 7854d87..0df2886 100644
> --- a/include/linux/ftrace.h
> +++ b/include/linux/ftrace.h
> @@ -311,6 +311,35 @@ ftrace_init_module(struct module *mod,
>                   unsigned long *start, unsigned long *end) { }
>  #endif
>
> +enum {
> +       POWER_NONE = 0,
> +       POWER_CSTATE = 1,
> +       POWER_PSTATE = 2,
> +};
> +
> +struct power_trace {
> +#ifdef CONFIG_POWER_TRACER
> +       ktime_t                 stamp;
> +       ktime_t                 end;
> +       int                     type;
> +       int                     state;
> +#endif
> +};
> +
> +#ifdef CONFIG_POWER_TRACER
> +extern void trace_power_start(struct power_trace *it, unsigned int type,
> +                                       unsigned int state);
> +extern void trace_power_mark(struct power_trace *it, unsigned int type,
> +                                       unsigned int state);
> +extern void trace_power_end(struct power_trace *it);
> +#else
> +static inline void trace_power_start(struct power_trace *it, unsigned int type,
> +                                       unsigned int state) { }
> +static inline void trace_power_mark(struct power_trace *it, unsigned int type,
> +                                       unsigned int state) { }
> +static inline void trace_power_end(struct power_trace *it) { }
> +#endif
> +


Sorry I didn't see it on my last mail.
But these headers seem to relate more on "power tracing" rather than "ftrace".
Perhaps these would find a better place on trace/power.h
I guess that could be done on a delta patch as well....


Just for curiosity, do you have an example of trace and/or graph from
this tracer?
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