Re: [PATCH v2 25/31] arm64: Performance counters support
From: Will Deacon <hidden>
Date: 2012-08-16 10:51:44
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linux-arm-kernel, lkml
On Wed, Aug 15, 2012 at 04:11:11PM +0100, Arnd Bergmann wrote:
On Tuesday 14 August 2012, Catalin Marinas wrote:quoted
From: Will Deacon <redacted> This patch adds support for the AArch64 performance counters. Signed-off-by: Will Deacon <redacted> 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