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From: Andi Kleen <>
	Andi Kleen <>
Subject: [PATCH 3/4] perf, tools, record: Remove misleading error suggestion
Date: Fri,  6 Apr 2018 13:38:11 -0700	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

From: Andi Kleen <>

When perf record encounters an error setting up an event it suggests
to enable CONFIG_PERF_EVENTS. This is misleading because:
- Usually it is enabled (it is really hard to disable on x86)
- The problem is usually somewhere else, e.g. the CPU is not supported
or an invalid configuration has been used.

Remove the misleading suggestion.

Signed-off-by: Andi Kleen <>
 tools/perf/util/evsel.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 1ac8d9236efd..66b62570c855 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -2894,8 +2894,7 @@ int perf_evsel__open_strerror(struct perf_evsel *evsel, struct target *target,
 	return scnprintf(msg, size,
 	"The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n"
-	"/bin/dmesg may provide additional information.\n"
-	"No CONFIG_PERF_EVENTS=y kernel support configured?",
+	"/bin/dmesg | grep -i perf may provide additional information.\n",
 			 err, str_error_r(err, sbuf, sizeof(sbuf)),

  parent reply	other threads:[~2018-04-06 20:38 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-06 20:38 Some minor fixes for perf user tools Andi Kleen
2018-04-06 20:38 ` [PATCH 1/4] perf, tools, mem: Allow all record/report options Andi Kleen
2018-04-21  7:50   ` [tip:perf/urgent] perf " tip-bot for Andi Kleen
2018-04-06 20:38 ` [PATCH 2/4] perf, tools: Clarify browser help Andi Kleen
2018-04-21  7:51   ` [tip:perf/urgent] perf hists browser: Clarify top/report " tip-bot for Andi Kleen
2018-04-06 20:38 ` Andi Kleen [this message]
2018-04-21  7:51   ` [tip:perf/urgent] perf record: Remove misleading error suggestion tip-bot for Andi Kleen
2018-04-06 20:38 ` [PATCH 4/4] perf, tools, record: Remove suggestion to enable APIC Andi Kleen
2018-04-21  7:52   ` [tip:perf/urgent] perf " tip-bot for Andi Kleen
2018-04-13 13:13 ` Some minor fixes for perf user tools Jiri Olsa
2018-04-13 14:33   ` Arnaldo Carvalho de Melo

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