| Date | Thu, 16 Aug 2012 11:51:34 +0100 | From | Will Deacon <> | Subject | Re: [PATCH v2 25/31] arm64: Performance counters support |
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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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