ARM A9 oprofile

Ming Lei ming.lei at canonical.com
Thu Feb 23 00:57:10 UTC 2012


On Wed, Feb 22, 2012 at 10:41 PM, Dmitry Antipov
<dmitry.antipov at linaro.org> wrote:
> On 02/22/2012 05:59 PM, Dave Martin wrote:
>
>> However, the way that the performance counter interrupts are routed is
>> dependent on the SoC.  OMAP4 and later have an unusual way of doing this,
>> which is why perf doesn't currently work upstream for these platforms.
>
>
> But will it work on Panda board with linux-linaro-3.3-rc3-2012.02-1 at
> least?

No, it doesn't work with upstream kernel now. You need to apply the
patches[1][2]
against upstream kernel to route CTIs IRQ so that OMAP4 PMU/perf can work well.

[1], http://marc.info/?l=linux-omap&m=132686049213313&w=2
[2], http://marc.info/?l=linux-arm-kernel&m=132687938417894&w=2

thanks,
--
Ming Lei



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