Re: [RFC PATCH 0/1] perf tools: Add 'm' event modifier for counting

[Nikita Shubin]

On Tue, 11 Jan 2022 14:29:15 +0000
Jessica Clarke <jrtc27@xxxxxxxxxx> wrote:

Hello Jessica!

> On 11 Jan 2022, at 14:20, Nikita Shubin <nikita.shubin@xxxxxxxxxxx>
> wrote:
> > 
> > From: Nikita Shubin <n.shubin@xxxxxxxxx>
> > 
> > This patch is a proposal to add Machine Mode modifier that is
> > currently available only for RISC-V for perf tool.
> > 
> > We don't currently have a level that is lower than kernel, so i
> > don't see we can reuse something existing for this purpose.
> > 
> > The exclude_machine bit seems harmless to as no one will proccess
> > it apart of riscv.  
> 
> Armv8 has equivalent bits in PMEVTYPER<n>_EL0 and PMCCFILTR_EL0 for
> EL-based filtering, which includes filtering EL3.
> 

Thank your for your tip, i ll study it and see if this is a good way to
go.

> Jess
> 
> > Patch depends on Atish Patra PMU series:
> > https://lwn.net/Articles/879905/
> > + some modifications to pass execlude event to SBI PMU extension
> > 
> > Tested with qemu.
> > 
> > Nikita Shubin (1):
> >  perf tools: Add 'm' event modifier for counting machine
> > 
> > include/uapi/linux/perf_event.h        |  3 ++-
> > tools/include/uapi/linux/perf_event.h  |  3 ++-
> > tools/perf/Documentation/perf-list.txt |  1 +
> > tools/perf/tests/parse-events.c        | 18 ++++++++++++++++++
> > tools/perf/util/evsel.c                |  4 +++-
> > tools/perf/util/parse-events.c         | 18 +++++++++++++-----
> > tools/perf/util/parse-events.l         |  2 +-
> > 7 files changed, 40 insertions(+), 9 deletions(-)
> > 
> > -- 
> > 2.31.1
> > 
> > 
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