linux-kernel - [PATCH 3/5] perf util: kernel profiling is disallowed only when perf_event

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Date:   Mon, 26 Aug 2019 21:39:14 -0400
From:   Igor Lubashev <ilubashe@...mai.com>
To:     Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>
CC:     Igor Lubashev <ilubashe@...mai.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Alexey Budankov <alexey.budankov@...ux.intel.com>,
        James Morris <jmorris@...ei.org>,
        "Namhyung Kim" <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        "Suzuki Poulouse" <suzuki.poulose@....com>,
        <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH 3/5] perf util: kernel profiling is disallowed only when perf_event_paranoid > 1

Perf was too restrictive about sysctl kernel.perf_event_paranoid. The
kernel only disallows profiling when perf_event_paranoid > 1. Make perf do
the same.

Signed-off-by: Igor Lubashev <ilubashe@...mai.com>
---
 tools/perf/util/evsel.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 0b3b5af33954..bfe6ed2abcc2 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -279,7 +279,7 @@ struct evsel *perf_evsel__new_idx(struct perf_event_attr *attr, int idx)
 
 static bool perf_event_can_profile_kernel(void)
 {
-	return perf_event_paranoid_check(-1);
+	return perf_event_paranoid_check(1);
 }
 
 struct evsel *perf_evsel__new_cycles(bool precise)
-- 
2.7.4