Messages in this thread Patch in this message | | | Date | Mon, 9 Dec 2013 16:58:35 -0500 (EST) | From | Vince Weaver <> | Subject | [patch] perf tools: perf list broken on ARM |
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Hello,
"perf list" listing of hardware events doesn't work on older ARM devices. The change enabling event detection:
commit b41f1cec91c37eeea6fdb15effbfa24ea0a5536b Author: Namhyung Kim <namhyung.kim@lge.com> Date: Tue Aug 27 11:41:53 2013 +0900
perf list: Skip unsupported events
uses the following code in tools/perf/util/parse-events.c:
struct perf_event_attr attr = { .type = type, .config = config, .disabled = 1, .exclude_kernel = 1, };
On ARM machines pre-dating the Cortex-A15 this doesn't work, as these machines don't support .exclude_kernel. So starting with 3.12 "perf list" does not report any hardware events at all on older machines (seen on Rasp-Pi, Pandaboard, Beagleboard, etc).
If we drop the "exclude_kernel" attribute events are properly reported.
Reported-by: Chad Paradis <chad.paradis@umit.maine.edu> Signed-off-by: Vince Weaver <vincent.weaver@maine.edu>
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c index 6de6f89..360ecab 100644 --- a/tools/perf/util/parse-events.c +++ b/tools/perf/util/parse-events.c @@ -1087,7 +1087,6 @@ static bool is_event_supported(u8 type, unsigned config) .type = type, .config = config, .disabled = 1, - .exclude_kernel = 1, }; struct { struct thread_map map;
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