[PATCH-REBASED,1/2] tools/perf: Handle EOPNOTSUPP for sampling events
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Message ID 1464607906-16012-2-git-send-email-vgupta@synopsys.com
State New
Headers show

Commit Message

Vineet Gupta May 30, 2016, 11:31 a.m. UTC
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@synopsys.com>
---
 tools/perf/util/evsel.c | 7 +++++++
 1 file changed, 7 insertions(+)

Patch
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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.");