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authorDavid Ahern <dsahern@gmail.com>2012-05-08 17:28:57 +0200
committerArnaldo Carvalho de Melo <acme@redhat.com>2012-05-09 16:57:29 +0200
commit028d455b12719a48b1c4b51ce07a074135726f8f (patch)
tree08959d68e6f3dc9cbd4d8e14467c1bdc24ade900 /tools
parentperf report: Fix format string for x86-32 compilation (diff)
downloadlinux-028d455b12719a48b1c4b51ce07a074135726f8f.tar.xz
linux-028d455b12719a48b1c4b51ce07a074135726f8f.zip
perf record: Fix fallback to cpu-clock on ppc
perf-record on PPC is not falling back to cpu-clock: $ perf record -ag -fo /tmp/perf.data -- sleep 1 Error: sys_perf_event_open() syscall returned with 6 (No such device or address). /bin/dmesg may provide additional information. Fatal: No CONFIG_PERF_EVENTS=y kernel support configured? 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 record -ag -fo /tmp/perf.data -v -- sleep 1 Old kernel, cannot exclude guest or host samples. The cycles event is not supported, trying to fall back to cpu-clock-ticks [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.151 MB /tmp/perf.data (~6592 samples) ] Signed-off-by: David Ahern <dsahern@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1336490937-57106-1-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-record.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 42e24149c791..1a9098c697b4 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -242,9 +242,13 @@ try_again:
/*
* If it's cycles then fall back to hrtimer
* based cpu-clock-tick sw counter, which
- * is always available even if no PMU support:
+ * is always available even if no PMU support.
+ *
+ * PPC returns ENXIO until 2.6.37 (behavior changed
+ * with commit b0a873e).
*/
- if (err == ENOENT && attr->type == PERF_TYPE_HARDWARE
+ if ((err == ENOENT || err == ENXIO)
+ && attr->type == PERF_TYPE_HARDWARE
&& attr->config == PERF_COUNT_HW_CPU_CYCLES) {
if (verbose)