From c63ca0c01d73563d4e2ab174bb3dd1e5efb907e6 Mon Sep 17 00:00:00 2001
From: David Ahern <dsahern@gmail.com>
Date: Fri, 29 Apr 2011 16:04:15 -0600
Subject: [PATCH] perf stat: Tell user about unsupported events in the list
Similar to perf-record, tell user about unsupported events
that will not be counted if invoked in verbose mode.
e.g.,
$ perf stat -e dTLB-prefetch-misses -v -- sleep 1
dTLB-prefetch-misses event is not supported by the kernel.
dTLB-prefetch-misses: 0 0 0
Performance counter stats for 'sleep 1':
<not counted> dTLB-prefetch-misses
1.001884783 seconds time elapsed
Signed-off-by: David Ahern <dsahern@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Link: http://lkml.kernel.org/r/1304114655-10600-1-git-send-email-dsahern@gmail.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
tools/perf/builtin-stat.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index c8b535bc27bd..602c3c96fa1e 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -377,8 +377,12 @@ static int run_perf_stat(int argc __used, const char **argv)
list_for_each_entry(counter, &evsel_list->entries, node) {
if (create_perf_stat_counter(counter) < 0) {
- if (errno == EINVAL || errno == ENOSYS || errno == ENOENT)
+ if (errno == EINVAL || errno == ENOSYS || errno == ENOENT) {
+ if (verbose)
+ ui__warning("%s event is not supported by the kernel.\n",
+ event_name(counter));
continue;
+ }
if (errno == EPERM || errno == EACCES) {
error("You may not have permission to collect %sstats.\n"
--
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