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| author | Adrian Hunter <adrian.hunter@intel.com> | 2013-12-11 14:36:23 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2013-12-13 10:30:20 -0300 |
| commit | 1a47245d2f3bf6276c95cd37901b562962d6ae47 (patch) | |
| tree | 0df8a19d1170beaea788b629c7cff52201a80cae /tools/perf/util/evlist.c | |
| parent | c506c96b61fa96c9a52ad4d25e895e45c1692650 (diff) | |
| download | lwn-1a47245d2f3bf6276c95cd37901b562962d6ae47.tar.gz lwn-1a47245d2f3bf6276c95cd37901b562962d6ae47.zip | |
perf tools: Add perf_event_paranoid()
Add a function to return the value of
/proc/sys/kernel/perf_event_paranoid.
This will be used to determine default values for mmap size because perf
is not subject to mmap limits when perf_event_paranoid is less than
zero.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1386765443-26966-12-git-send-email-alexander.shishkin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/evlist.c')
| -rw-r--r-- | tools/perf/util/evlist.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index af250556b33f..2eb7378e4c40 100644 --- a/tools/perf/util/evlist.c +++ b/tools/perf/util/evlist.c @@ -1191,8 +1191,7 @@ int perf_evlist__strerror_open(struct perf_evlist *evlist __maybe_unused, "Error:\t%s.\n" "Hint:\tCheck /proc/sys/kernel/perf_event_paranoid setting.", emsg); - if (filename__read_int("/proc/sys/kernel/perf_event_paranoid", &value)) - break; + value = perf_event_paranoid(); printed += scnprintf(buf + printed, size - printed, "\nHint:\t"); |