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authorDavid Ahern <dsahern@gmail.com>2012-05-08 09:29:16 -0600
committerArnaldo Carvalho de Melo <acme@redhat.com>2012-05-09 14:14:41 -0300
commit20d23aaa31da295378abff4272716e3dfc72baf0 (patch)
treee7d5a8be4425eb97ac1a396c7b0f08079259d861 /tools
parent09c0211c0bb0e40231e6ee9a35041d467ed72f16 (diff)
downloadlinaro-lsk-20d23aaa31da295378abff4272716e3dfc72baf0.tar.gz
perf stat: handle ENXIO error for perf_event_open
perf stat on PPC currently fails to run: $ perf stat -- sleep 1 Error: open_counter returned with 6 (No such device or address). /bin/dmesg may provide additional information. Fatal: Not all events could be opened. The problem is that until 2.6.37 (behavior changed with commit b0a873e) perf on PPC returns ENXIO when hw_perf_event_init() fails. With this patch we get the expected behavior: $ perf stat -v -- sleep 1 cycles event is not supported by the kernel. stalled-cycles-frontend event is not supported by the kernel. stalled-cycles-backend event is not supported by the kernel. instructions event is not supported by the kernel. branches event is not supported by the kernel. branch-misses event is not supported by the kernel. ... Signed-off-by: David Ahern <dsahern@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1336490956-57145-1-git-send-email-dsahern@gmail.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/builtin-stat.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 4532a789fbe..1e5e9b270f5 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -488,8 +488,13 @@ 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, first) < 0) {
+ /*
+ * PPC returns ENXIO for HW counters until 2.6.37
+ * (behavior changed with commit b0a873e).
+ */
if (errno == EINVAL || errno == ENOSYS ||
- errno == ENOENT || errno == EOPNOTSUPP) {
+ errno == ENOENT || errno == EOPNOTSUPP ||
+ errno == ENXIO) {
if (verbose)
ui__warning("%s event is not supported by the kernel.\n",
event_name(counter));