[lttng-dev] Stream trace data over PCIe (or anything else)

[Mathieu Desnoyers]

* Simon Marchi (simon.marchi at polymtl.ca) wrote:
> Hello LTTng cyborgs,
> 
> As some of you might know, I am trying to port and adapt LTTng to the
> Tilera TILEncore-Gx card (and later the Intel Xeon Phi). The main
> constraint with these platforms is the non existent disk space, which
> means the trace will have to be streamed. I am thinking of using the
> PCI express connection the two cards have to stream the trace data and
> save it on the host. It seems like this use case is similar to what
> the network consumer and relayd offer, but simply on another medium.
> 
> The consumer currently has two destination types: local and net (enum
> consumer_dst_type in bin/lttng-sessiond/consumer.h). I understand that
> I could create another type of consumer which sends data over the PCI
> port instead. On the other side of the bus, I could adapt relayd to
> receive on the PCI port of the host and save the trace as it currently
> does for the network.
> 
> I would like to hear your comments about this approach. Does it sound
> right, is there a better way ? Would it be worth it to design a system
> that would make it easier to add a new type of "transport" for the
> trace data ?

Is it possible to bind a network interface between the tilera and the
host that uses the PCI express port ?

Thanks,

Mathieu

> 
> Thanks !
> 
> Simon
> 
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-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com