kernel/linux.git/tools/perf/tests/expr.c, branch v5.19

perf expr: Allow exponents on floating point values

2022-06-19T13:41:43+00:00

Pass the optional exponent component through to strtod that already supports it. We already have exponents in ScaleUnit and so this adds uniformity. Reported-by: Zhengjun Xing Reviewed-By: Kajol Jain Signed-off-by: Ian Rogers Cc: Alexander Shishkin Cc: Andi Kleen Cc: Ingo Molnar Cc: Jiri Olsa Cc: Mark Rutland Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Stephane Eranian Cc: Thomas Richter Link: https://lore.kernel.org/r/20220527020653.4160884-1-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo

perf test: Fix 'Simple expression parser' test on arch without CPU die topology info

2021-12-07T00:57:53+00:00

Some platforms do not have CPU die support, for example s390. Commit Cc: Ian Rogers Fixes: fdf1e29b6118c18f ("perf expr: Add metric literals for topology.") fails on s390: # perf test -Fv 7 ... # FAILED tests/expr.c:173 #num_dies >= #num_packages ---- end ---- Simple expression parser: FAILED! # Investigating this issue leads to these functions: build_cpu_topology() +--> has_die_topology(void) { struct utsname uts; if (uname(&uts) < 0) return false; if (strncmp(uts.machine, "x86_64", 6)) return false; .... } which always returns false on s390. The caller build_cpu_topology() checks has_die_topology() return value. On false the the struct cpu_topology::die_cpu_list is not contructed and has zero entries. This leads to the failing comparison: #num_dies >= #num_packages. s390 of course has a positive number of packages. Fix this and check if the function build_cpu_topology() did build up a die_cpus_list. The number of entries in this list should be larger than 0. If the number of list element is zero, the die_cpus_list has not been created and the check in function test__expr(): TEST_ASSERT_VAL("#num_dies >= #num_packages", \ num_dies >= num_packages) always fails. Output after: # perf test -Fv 7 7: Simple expression parser : --- start --- division by zero syntax error ---- end ---- Simple expression parser: Ok # Fixes: fdf1e29b6118c18f ("perf expr: Add metric literals for topology.") Signed-off-by: Thomas Richter Acked-by: Ian Rogers Cc: Heiko Carstens Cc: Sumanth Korikkar Cc: Sven Schnelle Cc: Vasily Gorbik Link: http://lore.kernel.org/lkml/20211129112339.3003036-1-tmricht@linux.ibm.com [ Added comment in the added 'if (num_dies)' line about architectures not having die topology ] Signed-off-by: Arnaldo Carvalho de Melo

perf expr: Add source_count for aggregating events

2021-11-13T21:11:50+00:00

Events like uncore_imc/cas_count_read/ on Skylake open multiple events and then aggregate in the metric leader. To determine the average value per event the number of these events is needed. Add a source_count function that returns this value by counting the number of events with the given metric leader. For most events the value is 1 but for uncore_imc/cas_count_read/ it can yield values like 6. Add a generic test, but manually tested with a test metric that uses the function. Signed-off-by: Ian Rogers Acked-by: Jiri Olsa Cc: Alexander Shishkin Cc: Andi Kleen Cc: Ingo Molnar Cc: John Garry Cc: Kajol Jain Cc: Kan Liang Cc: Madhavan Srinivasan Cc: Mark Rutland Cc: Namhyung Kim Cc: Paul A . Clarke Cc: Peter Zijlstra Cc: Riccardo Mancini Cc: Song Liu Cc: Wan Jiabing Cc: Yury Norov Link: https://lore.kernel.org/r/20211111002109.194172-9-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo

perf expr: Add metric literals for topology.

2021-11-13T21:11:50+00:00

Allow the number of cpus, cores, dies and packages to be queried by a metric expression. Signed-off-by: Ian Rogers Acked-by: Jiri Olsa Cc: Alexander Shishkin Cc: Andi Kleen Cc: Ingo Molnar Cc: John Garry Cc: Kajol Jain Cc: Kan Liang Cc: Madhavan Srinivasan Cc: Mark Rutland Cc: Namhyung Kim Cc: Paul A . Clarke Cc: Peter Zijlstra Cc: Riccardo Mancini Cc: Song Liu Cc: Wan Jiabing Cc: Yury Norov Link: https://lore.kernel.org/r/20211111002109.194172-7-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo

perf test: Add expr test for events with hyphens

2021-11-13T21:11:50+00:00

An example of such an event is topdown-fe-bound. Signed-off-by: Ian Rogers Acked-by: Jiri Olsa Cc: Alexander Shishkin Cc: Andi Kleen Cc: Ingo Molnar Cc: John Garry Cc: Kajol Jain Cc: Kan Liang Cc: Madhavan Srinivasan Cc: Mark Rutland Cc: Namhyung Kim Cc: Paul A . Clarke Cc: Peter Zijlstra Cc: Riccardo Mancini Cc: Song Liu Cc: Wan Jiabing Cc: Yury Norov Link: https://lore.kernel.org/r/20211111002109.194172-2-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo

perf test: Rename struct test to test_suite

2021-11-13T13:32:22+00:00

This is to align with kunit's terminology. Signed-off-by: Ian Rogers Tested-by: Sohaib Mohamed Acked-by: Jiri Olsa Cc: Alexander Shishkin Cc: Brendan Higgins Cc: Daniel Latypov Cc: David Gow Cc: Ingo Molnar Cc: Jin Yao Cc: John Garry Cc: Mark Rutland Cc: Namhyung Kim Cc: Paul Clarke Cc: Peter Zijlstra Cc: Stephane Eranian Link: https://lore.kernel.org/r/20211104064208.3156807-6-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo

perf test: Move each test suite struct to its test

2021-11-13T13:30:58+00:00

Rather than export test functions, export the test struct. Rename with a suite__ prefix to avoid name collisions. Committer notes: Its '&suite__vectors_page', not '&suite__vectors_pages', noticed when cross building to arm (32-bit). Signed-off-by: Ian Rogers Tested-by: Sohaib Mohamed Acked-by: Jiri Olsa Cc: Alexander Shishkin Cc: Brendan Higgins Cc: Daniel Latypov Cc: David Gow Cc: Ingo Molnar Cc: Jin Yao Cc: John Garry Cc: Mark Rutland Cc: Namhyung Kim Cc: Paul Clarke Cc: Peter Zijlstra Cc: Stephane Eranian Link: https://lore.kernel.org/r/20211104064208.3156807-5-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo

perf metric: Encode and use metric-id as qualifier

2021-10-20T13:57:05+00:00

For a metric like IPC a group of events like {instructions,cycles}:W would be formed. If the events names were changed in parsing then the metric expression parser would fail to find them. This change makes the event encoding be something like: {instructions/metric-id=instructions/, cycles/metric-id=cycles/} and then uses the evsel's stable metric-id value to locate the events. This fixes the case that an event is restricted to user because of the paranoia setting: $ echo 2 > /proc/sys/kernel/perf_event_paranoid $ perf stat -M IPC /bin/true Performance counter stats for '/bin/true': 150,298 inst_retired.any:u # 0.77 IPC 187,095 cpu_clk_unhalted.thread:u 0.002042731 seconds time elapsed 0.000000000 seconds user 0.002377000 seconds sys Adding the metric-id as a qualifier has a complication in that qualifiers will become embedded in qualifiers. For example, msr/tsc/ could become msr/tsc,metric-id=msr/tsc// which will fail parse-events. To solve this problem the metric is encoded and decoded for the metric-id with ! standing in for an encoded value. Previously ! wasn't parsed. With this msr/tsc/ becomes msr/tsc,metric-id=msr!3tsc!3/ The metric expression parser is changed so that @ isn't changed to /, instead this is done when the ID is encoded for parse events. metricgroup__add_metric_non_group() and metricgroup__add_metric_weak_group() need to inject the metric-id qualifier, so to avoid repetition they are merged into a single metricgroup__build_event_string with error codes more rigorously checked. stat-shadow's prepare_metric() uses the metric-id to match the metricgroup code. As "metric-id=..." is added to all events, it is adding during testing with the fake PMU. This complicates pmu_str_check code as PE_PMU_EVENT_FAKE won't match as part of a configuration. The testing fake PMU case is fixed so that if a known qualifier with an ! is parsed then it isn't reported as a fake PMU. This is sufficient to pass all testing but it and the original mechanism are somewhat brittle. Signed-off-by: Ian Rogers Acked-by: Andi Kleen Cc: Adrian Hunter Cc: Alexander Antonov Cc: Alexander Shishkin Cc: Andrew Kilroy Cc: Andrew Morton Cc: Changbin Du Cc: Denys Zagorui Cc: Fabian Hemmer Cc: Felix Fietkau Cc: Heiko Carstens Cc: Ingo Molnar Cc: Jacob Keller Cc: Jiapeng Chong Cc: Jin Yao Cc: Jiri Olsa Cc: Joakim Zhang Cc: John Garry Cc: Kajol Jain Cc: Kan Liang Cc: Kees Kook Cc: Mark Rutland Cc: Namhyung Kim Cc: Nicholas Fraser Cc: Nick Desaulniers Cc: Paul Clarke Cc: Peter Zijlstra Cc: Riccardo Mancini Cc: Sami Tolvanen Cc: ShihCheng Tu Cc: Song Liu Cc: Stephane Eranian Cc: Sumanth Korikkar Cc: Thomas Richter Cc: Wan Jiabing Cc: Zhen Lei Link: https://lore.kernel.org/r/20211015172132.1162559-17-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo

perf metric: Modify resolution and recursion check

2021-10-20T13:35:33+00:00

Modify resolution. Rather than resolving a list of metrics, resolve a metric immediately after it is added. This simplifies knowing the root of the metric's tree so that IDs may be associated with it. A bug in the current implementation is that all the IDs were placed on the first metric in a metric group. Rather than maintain data on IDs' parents to detect cycles, maintain a list of visited metrics and detect cycles if the same metric is visited twice. Only place the root metric onto the list of metrics. Signed-off-by: Ian Rogers Acked-by: Andi Kleen Cc: Adrian Hunter Cc: Alexander Antonov Cc: Alexander Shishkin Cc: Andrew Kilroy Cc: Andrew Morton Cc: Changbin Du Cc: Denys Zagorui Cc: Fabian Hemmer Cc: Felix Fietkau Cc: Heiko Carstens Cc: Ingo Molnar Cc: Jacob Keller Cc: Jiapeng Chong Cc: Jin Yao Cc: Jiri Olsa Cc: Joakim Zhang Cc: John Garry Cc: Kajol Jain Cc: Kan Liang Cc: Kees Kook Cc: Mark Rutland Cc: Namhyung Kim Cc: Nicholas Fraser Cc: Nick Desaulniers Cc: Paul Clarke Cc: Peter Zijlstra Cc: Riccardo Mancini Cc: Sami Tolvanen Cc: ShihCheng Tu Cc: Song Liu Cc: Stephane Eranian Cc: Sumanth Korikkar Cc: Thomas Richter Cc: Wan Jiabing Cc: Zhen Lei Link: https://lore.kernel.org/r/20211015172132.1162559-10-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo

perf metric: Move runtime value to the expr context

2021-10-20T13:33:02+00:00

The runtime value is needed when recursively parsing metrics, currently a value of 1 is passed which is incorrect. Rather than add more arguments to the bison parser, add runtime to the context. Fix call sites not to pass a value. The runtime value is defaulted to 0, which is arbitrary. In some places this replaces a value of 1, which was also arbitrary. This shouldn't affect anything other than PPC. The use of 0 or 1 shouldn't matter as a proper runtime value would be needed in a case that it did matter. Signed-off-by: Ian Rogers Acked-by: Andi Kleen Cc: Adrian Hunter Cc: Alexander Antonov Cc: Alexander Shishkin Cc: Andrew Kilroy Cc: Andrew Morton Cc: Changbin Du Cc: Denys Zagorui Cc: Fabian Hemmer Cc: Felix Fietkau Cc: Heiko Carstens Cc: Ingo Molnar Cc: Jacob Keller Cc: Jiapeng Chong Cc: Jin Yao Cc: Jiri Olsa Cc: Joakim Zhang Cc: John Garry Cc: Kajol Jain Cc: Kan Liang Cc: Kees Kook Cc: Mark Rutland Cc: Namhyung Kim Cc: Nicholas Fraser Cc: Nick Desaulniers Cc: Paul Clarke Cc: Peter Zijlstra Cc: Riccardo Mancini Cc: Sami Tolvanen Cc: ShihCheng Tu Cc: Song Liu Cc: Stephane Eranian Cc: Sumanth Korikkar Cc: Thomas Richter Cc: Wan Jiabing Cc: Zhen Lei Link: https://lore.kernel.org/r/20211015172132.1162559-6-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo