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| author | Pekka Enberg <penberg@cs.helsinki.fi> | 2009-11-08 18:01:06 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-11-08 17:04:54 +0100 |
| commit | c10edee2e1716f8cf217cf52ed01ae4742fcdf3c (patch) | |
| tree | 30d894124621ba13ea5e7e06050b99953a401b62 /tools/perf/builtin-top.c | |
| parent | dd77038d233d106f297b907bf51459dfb1099eb1 (diff) | |
| download | talos-obmc-linux-c10edee2e1716f8cf217cf52ed01ae4742fcdf3c.tar.gz talos-obmc-linux-c10edee2e1716f8cf217cf52ed01ae4742fcdf3c.zip | |
perf tools: Fix permission checks
The perf_event_open() system call returns EACCES if the user is
not root which results in a very confusing error message:
$ perf record -A -a -f
Error: perfcounter syscall returned with -1 (Permission denied)
Fatal: No CONFIG_PERF_EVENTS=y kernel support configured?
It turns out that's because perf tools are checking only for
EPERM. Fix that up to get a much better error message:
$ perf record -A -a -f
Fatal: Permission error - are you root?
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <1257696066-4046-1-git-send-email-penberg@cs.helsinki.fi>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools/perf/builtin-top.c')
| -rw-r--r-- | tools/perf/builtin-top.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c index a1b1d10912dc..e23bc74e734f 100644 --- a/tools/perf/builtin-top.c +++ b/tools/perf/builtin-top.c @@ -1027,7 +1027,7 @@ try_again: if (fd[i][counter] < 0) { int err = errno; - if (err == EPERM) + if (err == EPERM || err == EACCES) die("No permission - are you root?\n"); /* * If it's cycles then fall back to hrtimer |
