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@xxxxxxx> > > > > This patch adds support for the AArch64 performance counters. > > > > Signed-off-by: Will Deacon <will.deacon@xxxxxxx> > > Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx> > > --- > > 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 -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
