ARM A9 oprofile

[Dave Martin]

On Wed, Feb 22, 2012 at 02:15:09PM +0400, Dmitry Antipov wrote:
> Hello Ming,
> 
> could you please give some pointers to observe an overall status of
> oprofile support on ARM A9 cores? IIUC, now it doesn't work

Note -- it's important to understand that there's a difference
between oprofile/perf on A9, and oprofile/perf on specific boards.

On A9 generically, perf (and hence oprofile -- oprofile is built on perf
now) works.

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.

Cheers
---Dave