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

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Date:   Fri, 8 Sep 2017 23:16:44 +0300
From:   Georgi Djakov <georgi.djakov@...aro.org>
To:     Steven Rostedt <rostedt@...dmis.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 8.09.17 г. 21:13, Steven Rostedt wrote:
> 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?
> 

My goal was to get just the path with some timestamps, but your suggestion
sounds good. Will do it. Thanks!