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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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  • Note: This was originally posted on 29th June 2012 at http://forums.arm.com

    The issue is dependent on the version of Gator/Streamline used.
    Gator has migrated from a tick-based system to a time-based system, which will cause the const value X to show in the timeline as something other than X unless the read function is called *exactly* in 1ms increments.
    Also, the .read functions are now called at various times, not just based on a 1ms tick. For example, they are now called whenever a context switch happens. In order to produce a flat timeline in Streamline, the value returned by the read function must be a function of time.
    The latest version, DS-5 v5.10, has updated examples, see gator_events_mmaped.c on http://git.linaro.org/gitweb?p=arm/ds5/gator.git;a=summary
    Sorry for the late response but hope this makes sense.
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  • Note: This was originally posted on 29th June 2012 at http://forums.arm.com

    The issue is dependent on the version of Gator/Streamline used.
    Gator has migrated from a tick-based system to a time-based system, which will cause the const value X to show in the timeline as something other than X unless the read function is called *exactly* in 1ms increments.
    Also, the .read functions are now called at various times, not just based on a 1ms tick. For example, they are now called whenever a context switch happens. In order to produce a flat timeline in Streamline, the value returned by the read function must be a function of time.
    The latest version, DS-5 v5.10, has updated examples, see gator_events_mmaped.c on http://git.linaro.org/gitweb?p=arm/ds5/gator.git;a=summary
    Sorry for the late response but hope this makes sense.
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