linux-kernel - Re: [PATCH v1] perf evlist: Force adding default events only to core PMUs

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Date: Sat, 25 May 2024 09:43:51 -0700
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Ian Rogers <irogers@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Adrian Hunter <adrian.hunter@...el.com>, Kan Liang <kan.liang@...ux.intel.com>, 
	James Clark <james.clark@....com>, Dominique Martinet <asmadeus@...ewreck.org>, 
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] perf evlist: Force adding default events only to core PMUs

On Sat, 25 May 2024 at 08:30, Ian Rogers <irogers@...gle.com> wrote:
>
> PMUs other than core PMUs may have a 'cycles' event. Default opening a
> non-core cycles event with perf record can lead to perf_event_open
> failure. Avoid this by only opening the default 'cycles' event on core
> PMUs.
>
> Closes: https://lore.kernel.org/lkml/CAHk-=wiWvtFyedDNpoV7a8Fq_FpbB+F5KmWK2xPY3QoYseOf_A@mail.gmail.com/
> Fixes: 617824a7f0f7 ("perf parse-events: Prefer sysfs/JSON hardware events over legacy")
> Signed-off-by: Ian Rogers <irogers@...gle.com>

This makes 'perf record' work for me again.

   Tested-by: Linus Torvalds <torvalds@...ux-foundation.org>

Thanks,

             Linus