[lttng-dev] Uprobe and extractor for coredump

[Mathieu Desnoyers]

* Chang, Zheng (Zheng.Chang at emc.com) wrote:
> Hi,
> 
>  
> 
> Recently Linus merged uprobe into kernel mainline and perf has supported
> user-space dynamic tracing now.
> 
> Is there any plan or motion on this with LTTng?

this would certainly be a nice feature! If you want to work on adding
support within lttng-modules and lttng-tools to enable tracing of
userspace through uprobes, it would certainly be welcome!

> 
> I did some research on buffer management of LTTng. And I'm trying to
> figure out a way to extract trace info from coredump.
> 
> Here is an immature idea about the extractor:
> 
> -          Resolve the addresses of necessary symbols from coredump with
> binary format library/tool
> 
> -          Restructure the data structures
> 
> -          Following the data structures, dump the buffer data page by
> page
> 
>  
> 
> Any good ideas or suggestions or concerns?

One main thing I want us to be careful about: if we do that, we need
some kind of versioning information in the tracer that can be checked by
the core dumper, so we can do changes internally without breaking the
code dump.

Thoughts ?

Thanks,

Mathieu

> 
>  
> 
> BR
> 
> Zheng
> 

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-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com