linux-kernel - Re: Ftrace Data Export

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Message-ID: <87mv9nt0tk.fsf@linux.intel.com>
Date:   Mon, 05 Jun 2017 09:17:59 +0300
From:   Felipe Balbi <felipe.balbi@...ux.intel.com>
To:     Chunyan Zhang <zhang.chunyan@...aro.org>
Cc:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Arnd Bergmann <arnd@...db.de>, Mark Brown <broonie@...aro.org>
Subject: Re: Ftrace Data Export


Hi,

Chunyan Zhang <zhang.chunyan@...aro.org> writes:
>> Maybe that's why they consider it an extra overhead? Have you considered
>> off-loading raw data for further post processing?
>
> Yes, that's also the way off-loading function trace has been implemented now.
> And like you said below, I also believe we can do the similar things
> to other tracers.
> I'd like to do this, but I have some other tasks in hands recently :-(

fair enough

>>>> function_graph, hwlat, irqsoff and all the other possibilities?
>>>
>>> I haven't thought about these clear enough :)
>>> Any suggestion?
>>
>> I think we should be able to export everything and anything :-p But, of
>> course, we would need tooling to decode it after the fact.
>
> Yes, tools for decoding these raw data with kernel binary is one
> thing, and how large storage STM can use to collect traces will also
> affect how much value doing this will bring in and perhaps will
> influence how we implement off-loading ftrace to trace export.
>
> Since I haven't played Intel STM, how large are the storages connected
> to STM on Intel platforms in general?

that I don't know :-) My interest here is to off-load it via USB. I
suppose Alex knows the size of STM storage on Intel systems.

-- 
balbi

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