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Tue, 19 Dec 2023 14:32:41 +0000 (GMT) From: Thomas Richter To: linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, acme@kernel.org, irogers@google.com Cc: svens@linux.ibm.com, gor@linux.ibm.com, sumanthk@linux.ibm.com, hca@linux.ibm.com, agordeev@linux.ibm.com, Thomas Richter Subject: [PATCH] perf test: test case 17 fails on s390 on z/vm Date: Tue, 19 Dec 2023 15:32:35 +0100 Message-Id: <20231219143235.1075522-1-tmricht@linux.ibm.com> X-Mailer: git-send-email 2.40.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: 4Nozn7tT4YC_p_gsyMNqGjecO6QtGehh X-Proofpoint-GUID: y0392DA6qR-Qn0NrOdwup2xIE8fbfIDC X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.997,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-12-19_08,2023-12-14_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=999 spamscore=0 lowpriorityscore=0 suspectscore=0 phishscore=0 malwarescore=0 clxscore=1011 priorityscore=1501 mlxscore=0 adultscore=0 bulkscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2312190108 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1785722620425257120 X-GMAIL-MSGID: 1785722620425257120 perf test 17 'Setup struct perf_event_attr' fails on s390 z/VM guest, using linux-next kernel. Root cause is the fall-back from hardware counter cycles perf_event_attr: type 0 (PERF_TYPE_HARDWARE) size 136 config 0 (PERF_COUNT_HW_CPU_CYCLES) { sample_period, sample_freq } 4000 sample_type IP|TID|TIME|ADDR|PERIOD|DATA_SRC read_format ID|LOST which returns -ENOENT on s390 z/VM guest. This causes the code to fall back to software counter task-clock, as can be seen in the debug output. ------------------------------------------------------------ perf_event_attr: type 1 (PERF_TYPE_SOFTWARE) size 136 config 0x1 (PERF_COUNT_SW_TASK_CLOCK) <-here { sample_period, sample_freq } 4000 sample_type IP|TID|TIME|ADDR|PERIOD|DATA_SRC read_format ID|LOST This succeeds on s390 z/VM guest. This successful installation of the counter task-clock is not listed in the expected results and the test case fails. This is caused by commit commit eb2eac0c7b61 ("perf evsel: Fallback to "task-clock" when not system wide") which introduced fall back from event 'cycles' to event 'task-clock'. To fix this on s390 allow event number 0 (cycles) and event number 1 (task-clock) as expected result. Output before: # ./perf test -Fv 17 17: Setup struct perf_event_attr : --- start --- running './tests/attr/test-stat-group1' unsupp './tests/attr/test-stat-group1' running './tests/attr/test-record-graph-default' test limitation '!aarch64' excluded architecture list ['aarch64'] expected config=0, got 1 FAILED './tests/attr/test-record-graph-default' - match failure ---- end ---- Setup struct perf_event_attr: FAILED! # Output after: # ./perf test -F 17 17: Setup struct perf_event_attr : Ok # Fixes: eb2eac0c7b61 ("perf evsel: Fallback to "task-clock" when not system wide") Signed-off-by: Thomas Richter --- tools/perf/tests/attr/base-record | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/perf/tests/attr/base-record b/tools/perf/tests/attr/base-record index 27c21271a16c..b44e4e6e4443 100644 --- a/tools/perf/tests/attr/base-record +++ b/tools/perf/tests/attr/base-record @@ -6,7 +6,7 @@ flags=0|8 cpu=* type=0|1 size=136 -config=0 +config=0|1 sample_period=* sample_type=263 read_format=0|4|20