linux-kernel - [tip:perf/core] perf evsel: Say which PMU Hardware event doesn't support sampling/overflow-interrupts

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Date:   Sat, 18 Nov 2017 00:36:09 -0800
From:   tip-bot for Kim Phillips <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     tglx@...utronix.de, mingo@...nel.org, linux-kernel@...r.kernel.org,
        kim.phillips@....com, jolsa@...hat.com,
        alexander.shishkin@...ux.intel.com, namhyung@...nel.org,
        hpa@...or.com, acme@...hat.com, peterz@...radead.org
Subject: [tip:perf/core] perf evsel: Say which PMU Hardware event doesn't
 support sampling/overflow-interrupts

Commit-ID:  114bc191c37028d87a540251d93e7b328f4de3fe
Gitweb:     https://git.kernel.org/tip/114bc191c37028d87a540251d93e7b328f4de3fe
Author:     Kim Phillips <kim.phillips@....com>
AuthorDate: Tue, 14 Nov 2017 15:04:52 -0600
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Thu, 16 Nov 2017 14:50:03 -0300

perf evsel: Say which PMU Hardware event doesn't support sampling/overflow-interrupts

Help identify to the user the event with the unsupported sampling error.
Also suggest a corrective action.

BEFORE:

$ sudo ./oldperf record -e armv8_pmuv3/mem_access/,ccn/cycles/,armv8_pmuv3/l2d_cache/ true
Error:
PMU Hardware doesn't support sampling/overflow-interrupts.

AFTER:

$ sudo ./newperf record -e armv8_pmuv3/mem_access/,ccn/cycles/,armv8_pmuv3/l2d_cache/ true
Error:
ccn/cycles/: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'

Signed-off-by: Kim Phillips <kim.phillips@....com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/20171114150452.e846f2e23684c7d7d8ee706f@arm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/evsel.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index cb9bcdb..b8e9def 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -2745,8 +2745,9 @@ int perf_evsel__open_strerror(struct perf_evsel *evsel, struct target *target,
 		break;
 	case EOPNOTSUPP:
 		if (evsel->attr.sample_period != 0)
-			return scnprintf(msg, size, "%s",
-	"PMU Hardware doesn't support sampling/overflow-interrupts.");
+			return scnprintf(msg, size,
+	"%s: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'",
+					 perf_evsel__name(evsel));
 		if (evsel->attr.precise_ip)
 			return scnprintf(msg, size, "%s",
 	"\'precise\' request may not be supported. Try removing 'p' modifier.");