Messages in this thread | | | Date | Mon, 6 Jul 2020 16:04:11 +0800 | From | Jisheng Zhang <> | Subject | Re: [PATCH 0/3] arm64: perf: add support for Cortex-A55/A75/A76 |
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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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