linux-kernel - Re: [RFC v3 2/3] interconnect: Add basic event tracing

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Date:   Fri, 8 Sep 2017 14:13:21 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Georgi Djakov <georgi.djakov@...aro.org>
Cc:     linux-pm@...r.kernel.org, gregkh@...uxfoundation.org,
        rjw@...ysocki.net, robh+dt@...nel.org, khilman@...libre.com,
        mturquette@...libre.com, vincent.guittot@...aro.org,
        skannan@...eaurora.org, sboyd@...eaurora.org,
        andy.gross@...aro.org, seansw@....qualcomm.com,
        davidai@...cinc.com, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, mark.rutland@....com,
        lorenzo.pieralisi@....com, Ingo Molnar <mingo@...hat.com>
Subject: Re: [RFC v3 2/3] interconnect: Add basic event tracing

On Fri,  8 Sep 2017 20:18:29 +0300
Georgi Djakov <georgi.djakov@...aro.org> wrote:

> diff --git a/include/trace/events/interconnect.h b/include/trace/events/interconnect.h
> new file mode 100644
> index 000000000000..c4a72163873c
> --- /dev/null
> +++ b/include/trace/events/interconnect.h
> @@ -0,0 +1,45 @@
> +#undef TRACE_SYSTEM
> +#define TRACE_SYSTEM interconnect
> +
> +#if !defined(_TRACE_INTERCONNECT_H) || defined(TRACE_HEADER_MULTI_READ)
> +#define _TRACE_INTERCONNECT_H
> +
> +#include <linux/tracepoint.h>
> +
> +struct interconnect_path;
> +
> +DECLARE_EVENT_CLASS(interconnect_path,
> +
> +	TP_PROTO(struct interconnect_path *path),
> +
> +	TP_ARGS(path),
> +
> +	TP_STRUCT__entry(
> +		__field(struct interconnect_path *, path)
> +	),
> +
> +	TP_fast_assign(
> +		__entry->path = path;
> +	),
> +
> +	TP_printk("INTERCONNECT: %p", __entry->path)

You're passing in an interconnect_path and only recording the pointer
to it? Wouldn't it be useful to record other aspects? Like the number
of nodes, the avg and peak bw of each node?

-- Steve

> +);
> +
> +DEFINE_EVENT(interconnect_path, interconnect_set,
> +
> +	TP_PROTO(struct interconnect_path *path),
> +
> +	TP_ARGS(path)
> +);
> +
> +DEFINE_EVENT(interconnect_path, interconnect_set_complete,
> +
> +	TP_PROTO(struct interconnect_path *path),
> +
> +	TP_ARGS(path)
> +);
> +
> +#endif /* _TRACE_INTERCONNECT_H */
> +
> +/* This part must be outside protection */
> +#include <trace/define_trace.h>