From 1a31fc904f1c897e4aaf7c3176e6aafa49f5d395 Mon Sep 17 00:00:00 2001
From: David Ahern <dsahern@gmail.com>
Date: Sun, 29 Jul 2012 20:53:03 -0600
Subject: [PATCH] perf top: Error handling for counter creation should parallel
perf-record
5a7ed29 fixed up perf-record but not perf-top. Similar argument holds
for it -- fallback to PMU only if it does not exist and handle invalid
attributes separately.
Signed-off-by: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Robert Richter <robert.richter@amd.com>
Link: http://lkml.kernel.org/r/1343616783-6360-1-git-send-email-dsahern@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/builtin-top.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 40264eaa9f0f..34096275a7b5 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -943,8 +943,10 @@ static void perf_top__start_counters(struct perf_top *top)
* based cpu-clock-tick sw counter, which
* is always available even if no PMU support:
*/
- if (attr->type == PERF_TYPE_HARDWARE &&
- attr->config == PERF_COUNT_HW_CPU_CYCLES) {
+ if ((err == ENOENT || err == ENXIO) &&
+ (attr->type == PERF_TYPE_HARDWARE) &&
+ (attr->config == PERF_COUNT_HW_CPU_CYCLES)) {
+
if (verbose)
ui__warning("Cycles event not supported,\n"
"trying to fall back to cpu-clock-ticks\n");
--
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