linux-kernel - Re: [PATCH v1] perf pmu: Treat the msr pmu as software

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Date: Sat, 27 Jan 2024 10:16:47 -0800
From: Namhyung Kim <namhyung@...nel.org>
To: Kan Liang <kan.liang@...ux.intel.com>,
	Mark Rutland <mark.rutland@....com>,
	Weilin Wang <weilin.wang@...el.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	linux-perf-users@...r.kernel.org,
	Ian Rogers <irogers@...gle.com>,
	James Clark <james.clark@....com>,
	Peter Zijlstra <peterz@...radead.org>,
	Samantha Alt <samantha.alt@...el.com>,
	Ingo Molnar <mingo@...hat.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Caleb Biggers <caleb.biggers@...el.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	linux-kernel@...r.kernel.org,
	Edward Baker <edward.baker@...el.com>,
	Perry Taylor <perry.taylor@...el.com>
Subject: Re: [PATCH v1] perf pmu: Treat the msr pmu as software

On Wed, 24 Jan 2024 15:42:00 -0800, Ian Rogers wrote:
> The msr PMU is a software one, meaning msr events may be grouped
> with events in a hardware context. As the msr PMU isn't marked as a
> software PMU by perf_pmu__is_software, groups with the msr PMU in
> are broken and the msr events placed in a different group. This
> may lead to multiplexing errors where a hardware event isn't
> counted while the msr event, such as tsc, is. Fix all of this by
> marking the msr PMU as software, which agrees with the driver.
> 
> [...]

Applied to perf-tools-next, thanks!

Best regards,
-- 
Namhyung Kim <namhyung@...nel.org>