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DS-5 Gator Module Customization

David Bercovitz
Note: This was originally posted on 30th November 2011 at http://forums.arm.com

Hello,
I have the default DS-5 and Streamline setup working fine using a Pandaboard. I have the gator.ko 5.7 source code and I'm trying to add some new traces to gator.ko. Using the mmaped exemple, I'm returning always the same 'int' value=300 from my function which I trace through a "printk" too. The printk shows the value is good and always equal to 300. However, going to the DS-5 Eclipse IDE, the Streamline interface shows some strange values in the range of 145 to 427 when zooming to the 1ms on the graphical Timeline view. It looks like the values displayed are not constant but around my original 300 value. Can anyone explain how this should be working to display a constant value in the IDE?
Thanks a lot,
David.
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  • Arm Employee Badge
    Note: This was originally posted on 20th February 2012 at http://forums.arm.com


    Unfortunately I have the same issue although I always return a constant.

    Just to make sure that I understood correctly:

    1. You did replace int freq = (int)(cpufreq_quick_get(smp_processor_id())/1000); with int freq = 350;
    2. The chart you see in Streamline is still not flat.

    3. You are using Streamline 5.8 and corresponding gator daemon and driver (I assume you've cloned the git at linaro.org?).

    Am I correct?

    If so, can you capture some short example (10 seconds max.) with minimal set of counters configured (let's say cycles counter and your cpufreq data), compress the directory with captured data and send them to me? (pawel.moll at arm.com) I'll have a look inside.


    I think the problem is somewhere else.

    No argument here :-)


    Are you testing on Pandaboard / OMAP4 platform?

    No, I have a Versatile Express here, but it really (really :-) shouldn't matter. The theory is simple - what you put (the "350" constant values) into the pipe at one end (the target) should come out at the other end, unchanged (still a lot of "350"s) and then visualized by Streamline as such.
Reply
  • Arm Employee Badge
    Note: This was originally posted on 20th February 2012 at http://forums.arm.com


    Unfortunately I have the same issue although I always return a constant.

    Just to make sure that I understood correctly:

    1. You did replace int freq = (int)(cpufreq_quick_get(smp_processor_id())/1000); with int freq = 350;
    2. The chart you see in Streamline is still not flat.

    3. You are using Streamline 5.8 and corresponding gator daemon and driver (I assume you've cloned the git at linaro.org?).

    Am I correct?

    If so, can you capture some short example (10 seconds max.) with minimal set of counters configured (let's say cycles counter and your cpufreq data), compress the directory with captured data and send them to me? (pawel.moll at arm.com) I'll have a look inside.


    I think the problem is somewhere else.

    No argument here :-)


    Are you testing on Pandaboard / OMAP4 platform?

    No, I have a Versatile Express here, but it really (really :-) shouldn't matter. The theory is simple - what you put (the "350" constant values) into the pipe at one end (the target) should come out at the other end, unchanged (still a lot of "350"s) and then visualized by Streamline as such.
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