[LITMUS^RT] Feather Trace tools

[Glenn Elliott]

On Jan 30, 2014, at 2:37 AM, Chandrasekaran Sivakumar <chandru.a6 at gmail.com> wrote:

> Hi,
> 
> I couldnt find ft_trace device in /dev/litmus. These options were not available when I did 'make menuconfig'
> 
> LITMUS^RT > Tracing > Feather-Trace Infrastructure (CONFIG_FEATHER_TRACE)
> LITMUS^RT > Tracing > Record timestamps for overhead measurements (CONFIG_SCHED_OVERHEAD_TRACE)
> LITMUS^RT > Tracing > Buffer size for Feather-Trace overhead data (CONFIG_SCHED_OVERHEAD_TRACE_SHIFT)
>  
> So I checked litmus/litmusrt/Kconfig..
> It had only this,
> 
> #
> # For a description of the syntax of this configuration file,
> # see Documentation/kbuild/kconfig-language.txt.
> #
> mainmenu "Linux/$ARCH $KERNELVERSION Kernel Configuration"
> 
> config SRCARCH
> 	string
> 	option env="SRCARCH"
> 
> source "arch/$SRCARCH/Kconfig"
> 
> Am I looking at the wrong file ?
> 
> Regards,
> chandru

You want to look at litmus-rt/litmus/Kconfig.  Here’s the file as it appears on github: https://github.com/LITMUS-RT/litmus-rt/blob/master/litmus/Kconfig

It looks like:
1) CONFIG_RELOCATABLE must NOT be set.
… and that’s it.

Björn: Is this constraint still necessary?  Didn’t we move to dynamically allocated buffers over the summer?

-Glenn
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