linux-kernel - [PATCH-REBASED 1/2] tools/perf: Handle EOPNOTSUPP for sampling events

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Date:	Mon, 30 May 2016 17:01:45 +0530
From:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:	<linux-perf-users@...r.kernel.org>
CC:	<peterz@...radead.org>, <acme@...hat.com>,
	<linux-kernel@...r.kernel.org>, <mingo@...nel.org>,
	<vincent.weaver@...ne.edu>, <linux-snps-arc@...ts.infradead.org>,
	<Alexey.Brodkin@...opsys.com>,
	Vineet Gupta <Vineet.Gupta1@...opsys.com>
Subject: [PATCH-REBASED 1/2] tools/perf: Handle EOPNOTSUPP for sampling events

This allows (with next change to perf core) for calling out in userspace
the exact reason for perf record failing when PMU doesn't support
overflow interrupts

Signed-off-by: Vineet Gupta <vgupta@...opsys.com>
---
 tools/perf/util/evsel.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 5d7037ef7d3b..1578e67c7357 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -2372,6 +2372,13 @@ int perf_evsel__open_strerror(struct perf_evsel *evsel, struct target *target,
 	 "No such device - did you specify an out-of-range profile CPU?");
 		break;
 	case EOPNOTSUPP:
+		/*
+		 * Needs to be tested ahead of precise_ip check as
+		 * that seems to be true for this case as well
+		 */
+		if (evsel->attr.sample_period != 0)
+			return scnprintf(msg, size, "%s",
+	"PMU Hardware doesn't support sampling/overflow-interrupts.");
 		if (evsel->attr.precise_ip)
 			return scnprintf(msg, size, "%s",
 	"\'precise\' request may not be supported. Try removing 'p' modifier.");
-- 
2.5.0