Do ARM Cortex-A9 PMU supoort oprofile

David Long dave.long at linaro.org
Tue Mar 6 07:47:03 UTC 2012


On Thu, 2012-03-01 at 16:59 +0000, Turgis, Frederic wrote:
> Wrong Dave, I meant Dave Long ;-)
> 
> OMAP Platform Business Unit - OMAP System Engineering - Platform Enablement - System Multimedia
> 
> 
> > Hi Dave,
> >
> > By the way, in http://lists.linaro.org/pipermail/linaro-dev/2011-September/thread.html#7560, we
> > discussed about oprofile timer mode granularity for platforms, which had the PMU bug that loses PMU
> > interrupts (4430, 4460 and maybe 4470).
> > Was this timer granularity proposed/introduced ? Is it in fact part of perf infrastructure (don't know
> > if perf relies directly on oprofile drivers/oprofile infrastructuret) ?
> >

Sorry for the delay in responding.

As far as I know this has not happened.  Such a change would also have
to include making the use of timer interrupts (as opposed to PMU counter
interrupts) selectable at runtime.  I believe the use of timer
interrupts for oprofile data collection is still a configuration/boot
option.  Alternatively we could just decide to deconfigure PMU hardware
counters by default to make timers accessible.

-dl





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