diff options
Diffstat (limited to 'tools/perf/builtin-top.c')
| -rw-r--r-- | tools/perf/builtin-top.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c index dd625808c2a5..3d2b47d5121a 100644 --- a/tools/perf/builtin-top.c +++ b/tools/perf/builtin-top.c @@ -1214,7 +1214,9 @@ try_again: int err = errno; if (err == EPERM || err == EACCES) - die("No permission - are you root?\n"); + die("Permission error - are you root?\n" + "\t Consider tweaking" + " /proc/sys/kernel/perf_event_paranoid.\n"); /* * If it's cycles then fall back to hrtimer * based cpu-clock-tick sw counter, which @@ -1231,7 +1233,7 @@ try_again: goto try_again; } printf("\n"); - error("perfcounter syscall returned with %d (%s)\n", + error("sys_perf_event_open() syscall returned with %d (%s). /bin/dmesg may provide additional information.\n", fd[i][counter][thread_index], strerror(err)); die("No CONFIG_PERF_EVENTS=y kernel support configured?\n"); exit(-1); |
