Commit-ID: 5a3446bc648d86a99a895e93d28d7df00bbbfb3c
Gitweb: http://git.kernel.org/tip/5a3446bc648d86a99a895e93d28d7df00bbbfb3c
Author: David Ahern <daahern@xxxxxxxxx>
AuthorDate: Sun, 9 Jan 2011 11:21:12 -0700
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Mon, 10 Jan 2011 11:34:53 -0200
perf stat: better error message for unsupported events
For unsupported events (e.g., H/W events when running in a VM)
perf stat currently fails with the error message:
Error: open_counter returned with 2 (No such file or directory).
/bin/dmesg may provide additional information.
Fatal: Not all events could be opened.
dmesg is of no help and it is not clear as to why it fails to
open the counter. This patch changes the error message to
Error: cache-misses event is not supported.
Fatal: Not all events could be opened.
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: a.p.zijlstra@xxxxxxxxx
LPU-Reference: <1294597272-17335-1-git-send-email-daahern@xxxxxxxxx>
Signed-off-by: David Ahern <daahern@xxxxxxxxx>
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/perf/builtin-stat.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 2dfcb61..c385a63 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -316,6 +316,8 @@ static int run_perf_stat(int argc __used, const char **argv)
"\t Consider tweaking"
" /proc/sys/kernel/perf_event_paranoid or running as root.",
system_wide ? "system-wide " : "");
+ } else if (errno == ENOENT) {
+ error("%s event is not supported. ", event_name(counter));
} else {
error("open_counter returned with %d (%s). "
"/bin/dmesg may provide additional information.\n",
--
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