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author | Pekka Enberg <penberg@cs.helsinki.fi> | 2009-11-08 16:01:06 (GMT) |
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committer | Ingo Molnar <mingo@elte.hu> | 2009-11-08 16:04:54 (GMT) |
commit | c10edee2e1716f8cf217cf52ed01ae4742fcdf3c (patch) | |
tree | 30d894124621ba13ea5e7e06050b99953a401b62 | |
parent | dd77038d233d106f297b907bf51459dfb1099eb1 (diff) | |
download | linux-c10edee2e1716f8cf217cf52ed01ae4742fcdf3c.tar.xz |
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>
-rw-r--r-- | tools/perf/builtin-record.c | 2 | ||||
-rw-r--r-- | tools/perf/builtin-top.c | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index 3eeef33..a4be453 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -426,7 +426,7 @@ try_again: if (fd[nr_cpu][counter] < 0) { int err = errno; - if (err == EPERM) + if (err == EPERM || err == EACCES) die("Permission error - are you root?\n"); else if (err == ENODEV && profile_cpu != -1) die("No such device - did you specify an out-of-range profile CPU?\n"); diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c index a1b1d10..e23bc74 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 |