Dear Suzuki,



From: Suzuki K Poulose <suzuki.poulose@arm.com>
Sent: 10 June 2019 18:15
To: Student - Ng Yi Zher Jeremy; mathieu.poirier@linaro.org
Cc: coresight@lists.linaro.org
Subject: Re: Request for Guidance in Using sysFS for Coresight in HiKey960 (Cortex A53/A73)
 
Hi,


On 10/06/2019 09:49, Student - Ng Yi Zher Jeremy wrote:
> Dear Sir,
>
> My apologies for spamming you with more, perhaps ridiculous, questions...
>
> I have been struggling to understand the systematic approach to conduct system
> traces with sysFS. I have asked similar question to hwangcc23, but I feel this
> question is suited more for the Linaro team.


>
> I am having trouble choosing the options for the coresight drivers in my
> Hikey960 device with Cortex A53 and A73 processors, 4 CPUs each. I have created
> a simple program that is a quick implementation of a link list in C program. The
> following is the objdump of the main object:

Is there any reason, why you wouldn't use the perf tool ? The perf tool will
automatically trace your application as it gets scheduled in/out on the CPU.
Using sysfs mode is not ideal for tracing a process.
My apologies for not using perf tool, however I was unable to find a tutorial or source code that allows me to cross-compile perf for Android use.

Android's simpleperf is not able to hook/trace ETM processes.

Nonetheless, I am aware of the existence of perf but not able to implement it in this mini-project of mine due to incompatibility.

You may try:

perf record -e cs_etm/@ec033000.etr/ --per-thread <your-application>


Please note that, if your application is multi-threaded, you may need
to use the latest version of the kernel/perf tools.


Cheers
Suzuki
​Thank you very much for your expertise advise! I appreciate it very much.

Cheers,
Jeremy

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