From 20d23aaa31da295378abff4272716e3dfc72baf0 Mon Sep 17 00:00:00 2001 From: David Ahern Date: Tue, 8 May 2012 09:29:16 -0600 Subject: [PATCH] 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 Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1336490956-57145-1-git-send-email-dsahern@gmail.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/builtin-stat.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c index 4532a78..1e5e9b2 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)); -- 1.7.10.4