[ltt-dev] UST - Problems in recording trace on a current process

[Naren]

Hi Pierre,

>>You could load in lttv both a userspace trace and a kernel trace that was
>>recorded at the same time. You would then get appropriate events for
drawing
>>the CFV as well as userspace events. For that you would need to make sure
the
>>TSC clock is used in ust (see kernelcompat.h).

I verified the clock source in kernelcompat.h. It uses gettimeofday from
sys/time.h. As you suggested, its imperative that a tsc clock source is used
when userspace and kernel tracing are combined.

I went through the timesource patch of lttng,x86-trace-clock.patch, a patch
dealing with switching clocksource of x86 architecture, to tsc.

Can you suggest as to how we can change the clocksource to tsc in ust?

Regards,
Naren
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