Re: [PATCH v6 13/13] alpha/perf: honor exclude_user and exclude_kernel for ProfileMe events

[sashiko-bot@kernel.org]

> The PMU sets PERF_PMU_CAP_NO_EXCLUDE, as the counters count in every
> mode. perf record then fails for unprivileged users: at the default
> perf_event_paranoid of 2, the tool sets exclude_kernel for them.
> 
> A ProfileMe sample says which mode the profiled instruction ran in, so
> the excluded samples can be dropped, as AMD IBS does with swfilt. Do
> that for ProfileMe events, counting PALmode as kernel, and ignore
> exclude_hv, as there is no hypervisor. A sample that falls back to the
> interrupted PC is dropped if either its PC or the profiled instruction
> is in an excluded mode. Aggregate events cannot tell, so event_init
> now rejects their exclude bits itself, along with exclude_idle,
> exclude_guest and exclude_host for all events.
> 
> The event count, and what PCTR1 counted during a window, still include
> the excluded modes, as they do for IBS.
> 
> Suggested-by: Ian Rogers <irogers@google.com>
> Assisted-by: Claude:claude-opus-5-5
> Signed-off-by: Matt Turner <mattst88@gmail.com>

Sashiko has reviewed this patch and found no issues.

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Sashiko AI review · https://sashiko.dev/#/patchset/20261104-alpha-profileme-v6-0-63362e9290a3@gmail.com?part=13