linux-kernel - [PATCH 7/8] perf tools: Add fallback for exclude

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Message-ID: <20240904064131.2377873-8-namhyung@kernel.org>
Date: Tue,  3 Sep 2024 23:41:30 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	Kan Liang <kan.liang@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-perf-users@...r.kernel.org,
	Ravi Bangoria <ravi.bangoria@....com>,
	Mark Rutland <mark.rutland@....com>,
	James Clark <james.clark@....com>,
	Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
	Kajol Jain <kjain@...ux.ibm.com>,
	Thomas Richter <tmricht@...ux.ibm.com>,
	Atish Patra <atishp@...shpatra.org>,
	Palmer Dabbelt <palmer@...osinc.com>,
	Mingwei Zhang <mizhang@...gle.com>,
	James Clark <james.clark@...aro.org>
Subject: [PATCH 7/8] perf tools: Add fallback for exclude_guest

It seems Apple M1 PMU requires exclude_guest set and returns EOPNOTSUPP
if not.  Let's add a fallback so that it can work with default events.

Cc: Mark Rutland <mark.rutland@....com>
Cc: James Clark <james.clark@...aro.org>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/util/evsel.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 0de0a72947db3f10..8c4d70f7b2f5b880 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -3400,6 +3400,27 @@ bool evsel__fallback(struct evsel *evsel, struct target *target, int err,
 			  "to fall back to excluding hypervisor samples", paranoid);
 		evsel->core.attr.exclude_hv = 1;
 
+		return true;
+	} else if (err == EOPNOTSUPP && !evsel->core.attr.exclude_guest &&
+		   !evsel->exclude_GH) {
+		const char *name = evsel__name(evsel);
+		char *new_name;
+		const char *sep = ":";
+
+		/* Is there already the separator in the name. */
+		if (strchr(name, '/') ||
+		    (strchr(name, ':') && !evsel->is_libpfm_event))
+			sep = "";
+
+		if (asprintf(&new_name, "%s%su", name, sep) < 0)
+			return false;
+
+		free(evsel->name);
+		evsel->name = new_name;
+		/* Apple M1 requires exclude_guest */
+		scnprintf(msg, msgsize, "trying to fall back to excluding guest samples");
+		evsel->core.attr.exclude_guest = 1;
+
 		return true;
 	}
 
-- 
2.46.0.469.g59c65b2a67-goog