kernel/tools/perf/tests/shell/test_data_symbol.sh, branch linux-rolling-stable

perf mem/c2c amd: Add ldlat support

2025-04-30T01:30:46Z

'perf mem/c2c' uses IBS Op PMU on AMD platforms. IBS Op PMU on Zen5 uarch has added support for Load Latency filtering. Implement 'perf mem/c2c' --ldlat using IBS Op Load Latency filtering capability. Some subtle differences between AMD and other arch: o --ldlat is disabled by default on AMD o Supported values are 128 to 2048. Signed-off-by: Ravi Bangoria Cc: Ananth Narayan Cc: Ian Rogers Cc: Ingo Molnar Cc: Jiri Olsa Cc: Joe Mario Cc: Kan Liang Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Sandipan Das Cc: Santosh Shukla Cc: Stephane Eranian Link: https://lore.kernel.org/r/20250429035938.1301-4-ravi.bangoria@amd.com Signed-off-by: Arnaldo Carvalho de Melo

perf tests: Fix data symbol test with LTO builds

2025-03-07T22:07:07Z

With LTO builds, although regular builds could also see this as all the code is in one file, the datasym workload can realize the buf1.reserved data is never accessed. The compiler moves the variable to bss and only keeps the data1 and data2 parts as separate variables. This causes the symbol check to fail in the test. Make the variable volatile to disable the more aggressive optimization. Rename the variable to make which buf1 in perf is being referred to. Before: $ perf test -vv "data symbol" 126: Test data symbol: --- start --- test child forked, pid 299808 perf does not have symbol 'buf1' perf is missing symbols - skipping test ---- end(-2) ---- 126: Test data symbol : Skip $ nm perf|grep buf1 0000000000a5fa40 b buf1.0 0000000000a5fa48 b buf1.1 After: $ nm perf|grep buf1 0000000000a53a00 d buf1 $ perf test -vv "data symbol"126: Test data symbol: --- start --- test child forked, pid 302166 a53a00-a53a39 l buf1 perf does have symbol 'buf1' Recording workload... Waiting for "perf record has started" message OK Cleaning up files... ---- end(0) ---- 126: Test data symbol : Ok Fixes: 3dfc01fe9d12 ("perf test: Add 'datasym' test workload") Signed-off-by: Ian Rogers Link: https://lore.kernel.org/r/20250226230109.314580-1-irogers@google.com Signed-off-by: Namhyung Kim

perf test: Simplify data symbol test

2025-03-05T17:17:01Z

Now the workload will end after 1 second. Just run it with perf instead of waiting for the background process. Reviewed-by: Leo Yan Tested-by: Thomas Richter Tested-by: Thomas Falcon Cc: Thomas Richter Cc: Leo Yan Link: https://lore.kernel.org/r/20250304022837.1877845-7-namhyung@kernel.org Signed-off-by: Namhyung Kim

perf test: Tag parallel failing shell tests with "(exclusive)"

2024-10-28T16:32:58Z

Some shell tests compete for resources and so can't run with other tests, tag such tests. The "(exclusive)" stems from shared/exclusive to describe how the tests run as if holding a lock. For ARM/coresight tests: Suggested-by: James Clark Additional failing tests: Suggested-by: Namhyung Kim Tested-by: James Clark Signed-off-by: Ian Rogers Cc: Colin Ian King Cc: Howard Chu Cc: Weilin Wang Cc: Ilya Leoshkevich Cc: Thomas Richter Cc: Andi Kleen Cc: Dapeng Mi Cc: Athira Jajeev Cc: Michael Petlan Cc: Veronika Molnarova Link: https://lore.kernel.org/r/20241025192109.132482-6-irogers@google.com Signed-off-by: Namhyung Kim

perf tests: Skip data symbol test if buf1 symbol is missing

2023-11-27T18:40:28Z

perf data symbol test depends on finding symbol buf1 in perf, and fails if perf has been stripped and no debug object is available. In that case, skip the test instead. Example: Before: $ strip tools/perf/perf $ tools/perf/perf buildid-cache -p `realpath tools/perf/perf` $ tools/perf/perf test -v 'data symbol' 113: Test data symbol : --- start --- test child forked, pid 125646 Recording workload... [ perf record: Woken up 3 times to write data ] [ perf record: Captured and wrote 0.577 MB /tmp/__perf_test.perf.data.Jhbdp (7794 samples) ] Cleaning up files... test child finished with -1 ---- end ---- Test data symbol: FAILED! After: $ tools/perf/perf test -v 'data symbol' 113: Test data symbol : --- start --- test child forked, pid 125747 perf does not have symbol 'buf1' perf is missing symbols - skipping test test child finished with -2 ---- end ---- Test data symbol: Skip Signed-off-by: Adrian Hunter Acked-by: Ian Rogers Cc: German Gomez Cc: James Clark Cc: Jiri Olsa Cc: Leo Yan Cc: Namhyung Kim Link: https://lore.kernel.org/r/20231123075848.9652-9-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo

perf tests: Make data symbol test wait for perf to start

2023-11-27T18:40:25Z

The perf data symbol test waits 1 second for perf to run and collect data, which may be too little if perf takes a long time to start up, which has been noticed on systems with many CPUs. Use existing wait_for_perf_to_start helper to wait for perf to start. Signed-off-by: Adrian Hunter Acked-by: Ian Rogers Cc: German Gomez Cc: James Clark Cc: Jiri Olsa Cc: Leo Yan Cc: Namhyung Kim Link: https://lore.kernel.org/r/20231123075848.9652-8-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo

perf tools: Use "grep -E" instead of "egrep"

2022-12-14T18:28:19Z

The latest version of grep claims the egrep is now obsolete so the build now contains warnings that look like: egrep: warning: egrep is obsolescent; using grep -E fix this up by moving the related file to use "grep -E" instead. sed -i "s/egrep/grep -E/g" `grep egrep -rwl tools/perf` Here are the steps to install the latest grep: wget http://ftp.gnu.org/gnu/grep/grep-3.8.tar.gz tar xf grep-3.8.tar.gz cd grep-3.8 && ./configure && make sudo make install export PATH=/usr/local/bin:$PATH Signed-off-by: Tiezhu Yang Acked-by: Ian Rogers Cc: Alexander Shishkin Cc: Jiri Olsa Cc: Mark Rutland Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lore.kernel.org/lkml/1668762999-9297-1-git-send-email-yangtiezhu@loongson.cn Signed-off-by: Arnaldo Carvalho de Melo

perf test: Replace data symbol test workload with datasym

2022-11-23T13:29:59Z

So that it can get rid of requirement of a compiler. $ sudo ./perf test -v 109 109: Test data symbol : --- start --- test child forked, pid 844526 Recording workload... [ perf record: Woken up 2 times to write data ] [ perf record: Captured and wrote 0.354 MB /tmp/__perf_test.perf.data.GFeZO (4847 samples) ] Cleaning up files... test child finished with 0 ---- end ---- Test data symbol: Ok Signed-off-by: Namhyung Kim Tested-by: James Clark Cc: Adrian Hunter Cc: Athira Jajeev Cc: German Gomez Cc: Ian Rogers Cc: Ingo Molnar Cc: Jiri Olsa Cc: Leo Yan Cc: Peter Zijlstra Cc: Zhengjun Xing Link: https://lore.kernel.org/r/20221116233854.1596378-13-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf test: Introduce script for data symbol testing

2022-10-06T14:12:14Z

The test is designed with a data structure with 64-byte alignment, it has two fields "data1" and "data2", and other fields are reserved. Using the "perf mem" command, we can record and report memory samples for a self-contained workload with 1 second duration. If no samples are obtained for the data structure "buf1", it reports failure; and by checking the offset in structure "buf1", if the memory samples aren't for the "data1" and "data2" fields, it means wrong data symbol parsing and returns failure. Committer testing: [root@quaco ~]# grep -m1 "model name" /proc/cpuinfo model name : Intel(R) Core(TM) i7-8650U CPU @ 1.90GHz [root@quaco ~]# [root@quaco ~]# perf test -v "data symbol" 104: Test data symbol : --- start --- test child forked, pid 192318 Compiling test program... Recording workload... [ perf record: Woken up 2 times to write data ] [ perf record: Captured and wrote 0.389 MB /tmp/__perf_test.perf.data.LIuQl (5570 samples) ] Cleaning up files... test child finished with 0 ---- end ---- Test data symbol: Ok [root@quaco ~]# Signed-off-by: Leo Yan Tested-by: Arnaldo Carvalho de Melo Cc: Alexander Shishkin Cc: Ingo Molnar Cc: Jiri Olsa Cc: Mark Rutland Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Ravi Bangoria Link: https://lore.kernel.org/r/20221006101039.47870-1-leo.yan@linaro.org Signed-off-by: Arnaldo Carvalho de Melo