[ltt-dev] to find all the tracepoints by the __start___tracepoints and __stop___tracepoints

[Mathieu Desnoyers]

And given we don't rely on such automagic linker features for the
kernel, include/asm-generic/vmlinux.lds.h specifies :

#define DATA_DATA
...
        VMLINUX_SYMBOL(__start___tracepoints) = .;                      \
        *(__tracepoints)                                                \
        VMLINUX_SYMBOL(__stop___tracepoints) = .;                       \

Therefore, as Pierre-Marc says, the linker is responsible for
initialising those symbols.

Mathieu


* Pierre-Marc Fournier (pierre-marc.fournier at polymtl.ca) wrote:
> Hello,
> 
> These symbols are automatically placed by the linker at the boundaries
> of the __tracepoints section.
> 
> This magic is done in the linker script.
> 
> pmf
> 
> long xu wrote:
> > Hello,
> > 
> > I find when we use the fuction "tracepoint_update_probe_range", it usese
> > the "__start___tracepoints" and "__stop___tracepoints" to find all of
> > the tracepoints. But i don't find where it do the initialisation of the
> > "__start___tracepoints" and "__stop___tracepoints". How can they point
> > the first tracepoint and the last point?
> > 
> > Thanks,
> > 
> > Best Regard,
> > 
> > Long XU
> > 
> > 
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-- 
Mathieu Desnoyers
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