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Date: Mon, 6 Jul 2020 16:04:11 +0800 From: Jisheng Zhang <Jisheng.Zhang@...aptics.com> To: Will Deacon <will@...nel.org> Cc: Robin Murphy <robin.murphy@....com>, Mark Rutland <mark.rutland@....com>, Catalin Marinas <catalin.marinas@....com>, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH 0/3] arm64: perf: add support for Cortex-A55/A75/A76 Hi Will, On Fri, 3 Jul 2020 13:33:47 +0100 Will Deacon wrote: > > > On Fri, Jun 19, 2020 at 06:44:37PM +0800, Jisheng Zhang wrote: > > The Cortex-A55/A75/A76 use some implementation defined perf events. > > Add the support. > > > > Jisheng Zhang (3): > > arm64: perf: add support for Cortex-A55 > > arm64: perf: add support for Cortex-A75 > > arm64: perf: add support for Cortex-A76 > > > > arch/arm64/kernel/perf_event.c | 49 +++++++++++++++++++++++++++++++--- > > 1 file changed, 45 insertions(+), 4 deletions(-) > > Do we really need this? I'd prefer for this stuff to live in userspace IMHO, this stuff is to add a relationship between linux standard HW events and ARM PMU events, take CA55 for example: w/o the stuff, perf -e PREFETCH_LINEFILL w/ the stuff, perf -e L1-dcache-prefetch-misses But indeed, we also need to add json descriptions in perf tool, I'll submit patches. Thanks > now that the perf tool has supported JSON event descriptions for a while, > and the in-kernel driver advertises the architected events advertised > by PMCEID*. > > Will
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