[ltt-dev] lttng for nommu cpus
Mathieu Desnoyers
compudj at krystal.dyndns.org
Sun Dec 14 17:27:45 EST 2008
* andy (rootstrap at googlemail.com) wrote:
> Hi
>
> I try to investigate performance issues on a cpu (blackfin) that does
> not have mmu.
> I have ported a lttng patch, but unfortunately it does not work, as
> relayfs is not supported
> on mmu-less cpus.
> A Call to allocte buffers in relayfs lead to vmap(), which is not
> supported on mmu-less
> systems
>
> Is there any flavor of lttng that has been reported to work on mmu-less system?
> Any links?
>
The latest LTTng versions implement a ltt-relay-alloc module which is a
fork from the original relay. It does not depend on vmap'd memory at
all, so it should be fine with mmu-less cpus.
I'd be interested to merge your blackfin patches when they are ready.
Mathieu
> Thank you,
> Andy
>
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--
Mathieu Desnoyers
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