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SubjectRe: [PATCH v2 25/31] arm64: Performance counters support
On Wed, Aug 15, 2012 at 04:11:11PM +0100, Arnd Bergmann wrote:
> On Tuesday 14 August 2012, Catalin Marinas wrote:
> > From: Will Deacon <will.deacon@arm.com>
> >
> > This patch adds support for the AArch64 performance counters.
> >
> > Signed-off-by: Will Deacon <will.deacon@arm.com>
> > Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
> > ---
> > arch/arm64/include/asm/perf_event.h | 22 +
> > arch/arm64/include/asm/pmu.h | 82 +++
> > arch/arm64/kernel/perf_event.c | 1368 +++++++++++++++++++++++++++++++++++
> > tools/perf/perf.h | 6 +
>
> Can you explain how AArch64 performance counters differ from the 32
> bit ones? Do they work for AArch32 user space under AArch64 kernels?
> Is it possible to share parts of the implementation with arch/arm?

Perf should work for compat tasks, yes. I'd like to share some of the code
with arch/arm/ and I've started reworking the arch/arm/ stuff to accomodate
this better:

git://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git perf/updates

I'm not sure how well it will fit in drivers/ but I'm certainly willing to
give it a try.

Will


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