oprofile and ARM A9 hardware counter

[Ming Lei]

Hi,

2012/1/27 Will Deacon <will.deacon at arm.com>:
> Mans,
>
> On Fri, Jan 27, 2012 at 12:56:35PM +0000, Måns Rullgård wrote:
>> Will Deacon <will.deacon at arm.com> writes:
>> > Did this lead anywhere in the end? It seems as though Ming Lei has a working
>> > setup but Stephane is unable to replicate it, despite applying the necessary
>> > patches and trying an updated bootloader.
>>
>> With the patches listed above plus the one in [1], I get PMU interrupts.
>> However, unless I restrict the profiled process to one CPU
>> (taskset 1 perf record ...), I get a panic in armpmu_event_update() with
>> the 'event' argument being null when called from armv7pmu_handle_irq().
>>
>> [1] http://article.gmane.org/gmane.linux.ports.arm.omap/69696
>
> Great, thanks for trying this out. Which version of the kernel were you
> using?

The patch is required for 3.3-rc1 in case that omap4 pmu works well.

thanks,
--
Ming Lei