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Commit 5229e366 authored by Arnaldo Carvalho de Melo's avatar Arnaldo Carvalho de Melo
Browse files

perf evlist: Add suggestion of how to set perf_event_paranoid sysctl 

Minor hint to speed up problem resolution and get 'trace' working for
non root users.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-abdqi8km4fj9osrn70q2zj9v@git.kernel.org


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent cdcd1e6b

tools/perf/util/evlist.c

+3 −2
Original line number Diff line number Diff line
@@ -1214,10 +1214,11 @@ int perf_evlist__strerror_open(struct perf_evlist *evlist __maybe_unused, 
					     "For your workloads it needs to be <= 1\nHint:\t");

		}

		printed += scnprintf(buf + printed, size - printed,

				     "For system wide tracing it needs to be set to -1");

				     "For system wide tracing it needs to be set to -1.\n");



		printed += scnprintf(buf + printed, size - printed,

				    ".\nHint:\tThe current value is %d.", value);

				    "Hint:\tTry: 'sudo sh -c \"echo -1 > /proc/sys/kernel/perf_event_paranoid\"'\n"

				    "Hint:\tThe current value is %d.", value);

		break;

	default:

		scnprintf(buf, size, "%s", emsg);