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| author | David Ahern <dsahern@gmail.com> | 2012-05-08 17:29:16 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2012-05-09 19:14:41 +0200 |
| commit | 20d23aaa31da295378abff4272716e3dfc72baf0 (patch) | |
| tree | e7d5a8be4425eb97ac1a396c7b0f08079259d861 /kernel/trace | |
| parent | perf: Turn off compiler warnings for flex and bison generated files (diff) | |
| download | linux-20d23aaa31da295378abff4272716e3dfc72baf0.tar.xz linux-20d23aaa31da295378abff4272716e3dfc72baf0.zip | |
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 'kernel/trace')
0 files changed, 0 insertions, 0 deletions