From: Andi Kleen <a...@linux.intel.com>
It's not possible to run a package event and a per cpu event in
the same group. This is used by some of the power metrics.
They work correctly when not using a group.
Normally weak groups should handle that, but in this case EBADF
is returned instead of the normal EINVAL.
strace -e perf_event_open ./perf stat -v -e
'{cstate_pkg/c2-residency/,msr/tsc/}:W' -a sleep 1
Using CPUID GenuineIntel-6-3E
perf_event_open({type=0x17 /* PERF_TYPE_??? */, size=PERF_ATTR_SIZE_VER5,
config=0, ...}, -1, 0, -1, PERF_FLAG_FD_CLOEXEC) = -1 EINVAL (Invalid argument)
perf_event_open({type=0x17 /* PERF_TYPE_??? */, size=PERF_ATTR_SIZE_VER5,
config=0, ...}, -1, 0, -1, 0) = -1 EINVAL (Invalid argument)
perf_event_open({type=0x17 /* PERF_TYPE_??? */, size=PERF_ATTR_SIZE_VER5,
config=0, ...}, -1, 0, -1, 0) = -1 EINVAL (Invalid argument)
perf_event_open({type=0x17 /* PERF_TYPE_??? */, size=PERF_ATTR_SIZE_VER5,
config=0, ...}, -1, 0, -1, 0) = -1 EINVAL (Invalid argument)
perf_event_open({type=0x17 /* PERF_TYPE_??? */, size=PERF_ATTR_SIZE_VER5,
config=0, ...}, -1, 0, -1, 0) = 3
perf_event_open({type=0x7 /* PERF_TYPE_??? */, size=PERF_ATTR_SIZE_VER5,
config=0, ...}, -1, 0, 3, 0) = 4
perf_event_open({type=0x7 /* PERF_TYPE_??? */, size=PERF_ATTR_SIZE_VER5,
config=0, ...}, -1, 1, 0, 0) = -1 EBADF (Bad file descriptor)
and perf errors out.
Make weak groups trigger a fall back for EBADF too. Then this case works
correctly:
$ ./perf stat -v -e '{cstate_pkg/c2-residency/,msr/tsc/}:W' -a sleep 1
Using CPUID GenuineIntel-6-3E
Weak group for cstate_pkg/c2-residency//2 failed
cstate_pkg/c2-residency/: 476709882 1000598460 1000598460
msr/tsc/: 39625837911 12007369110 12007369110
Performance counter stats for 'system wide':
476,709,882 cstate_pkg/c2-residency/
39,625,837,911 msr/tsc/
1.000697588 seconds time elapsed
This fixes perf stat -M Power ...
$ ./perf stat -M Power --metric-only -a sleep 1
Performance counter stats for 'system wide':
Turbo_Utilization C3_Core_Residency C6_Core_Residency
C7_Core_Residency C2_Pkg_Residency C3_Pkg_Residency C6_Pkg_Residency
C7_Pkg_Residency
1.0 0.7 30.0 0.0
0.9 0.1 0.4 0.0
1.001240740 seconds time elapsed
Signed-off-by: Andi Kleen <a...@linux.intel.com>
---
tools/perf/builtin-stat.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 60206a1e03aa..1929f92c824b 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -656,7 +656,7 @@ static int __run_perf_stat(int argc, const char **argv)
if (create_perf_stat_counter(counter) < 0) {
/* Weak group failed. Reset the group. */
- if (errno == EINVAL &&
+ if ((errno == EINVAL || errno == EBADF) &&
counter->leader != counter &&
counter->weak_group) {
counter = reset_weak_group(counter);
--
2.9.5
