perf evlist: Add suggestion of how to set perf_event_paranoid sysctl
tip-bot for Arnaldo Carvalho de Melo
merge botCommit-ID: 5229e366ee6baeb58b77e09643d2e11cbbd29950 Gitweb: http://git.kernel.org/tip/5229e366ee6baeb58b77e09643d2e11cbbd29950 Author: Arnaldo Carvalho de Melo <[email protected]> AuthorDate: Tue, 10 Jun 2014 17:18:54 -0300 Committer: Arnaldo Carvalho de Melo <[email protected]> CommitDate: Thu, 19 Jun 2014 16:13:12 -0300
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 <[email protected]>
Cc David Ahern <[email protected]>
Cc Don Zickus <[email protected]>
Cc Frederic Weisbecker <[email protected]>
Cc Jiri Olsa <[email protected]>
Cc Mike Galbraith <[email protected]>
Cc Namhyung Kim <[email protected]>
Cc Paul Mackerras <[email protected]>
Cc Peter Zijlstra <[email protected]>
Cc Stephane Eranian <[email protected]>
Signed-off-by Arnaldo Carvalho de Melo <[email protected]>
--- tools/perf/util/evlist.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
tools/perf/util/evlist.c +3 -2
@@ -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);