Messages in this thread | | | Date | Fri, 12 Aug 2022 16:09:35 -0700 | Subject | [PATCH v5 00/14] Compress the pmu_event tables | From | Ian Rogers <> |
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jevents.py creates a number of large arrays from the json events. The arrays contain pointers to strings that need relocating. The relocations have file size, run time and memory costs. These changes refactor the pmu_events API so that the storage of the pmu_event struct isn't exposed. The format is then changed to an offset within a combined big string, with adjacent pmu_event struct variables being next to each other in the string separated by \0 - meaning only the first variable of the struct needs its offset recording.
Some related fixes are contained with the patches. The architecture jevents.py creates tables for can now be set by the JEVENTS_ARCH make variable, with a new 'all' that generates the events and metrics for all architectures.
An example of the improvement to the file size on x86 is: no jevents - the same 19,788,464bytes x86 jevents - ~16.7% file size saving 23,744,288bytes vs 28,502,632bytes all jevents - ~19.5% file size saving 24,469,056bytes vs 30,379,920bytes default build options plus NO_LIBBFD=1.
I originally suggested fixing this problem in: https://lore.kernel.org/linux-perf-users/CAP-5=fVB8G4bdb9T=FncRTh9oBVKCS=+=eowAO+YSgAhab+Dtg@mail.gmail.com/
v5. Renamed two functions to be more inline with the code and added extra commit message detail on the event sorting order as suggested by John Garry <john.garry@huawei.com>. v4. Fixed an issue with the empty-pmu-events.c spotted by John Garry <john.garry@huawei.com>. v3. Fix an ARM build issue with a missed weak symbol. Perform some pytype clean up. v2. Split the substring folding optimization to its own patch and comment tweaks as suggested by Namhyung Kim <namhyung@kernel.org>. Recompute the file size savings with the latest json events and metrics.
Ian Rogers (14): perf jevent: Add an 'all' architecture argument perf jevents: Remove the type/version variables perf jevents: Provide path to json file on error perf jevents: Sort json files entries perf pmu-events: Hide pmu_sys_event_tables perf pmu-events: Avoid passing pmu_events_map perf pmu-events: Hide pmu_events_map perf test: Use full metric resolution perf pmu-events: Move test events/metrics to json perf pmu-events: Don't assume pmu_event is an array perf pmu-events: Hide the pmu_events perf metrics: Copy entire pmu_event in find metric perf jevents: Compress the pmu_events_table perf jevents: Fold strings optimization
tools/perf/arch/arm64/util/pmu.c | 4 +- .../arch/test/test_soc/cpu/metrics.json | 64 +++ tools/perf/pmu-events/empty-pmu-events.c | 204 +++++++- tools/perf/pmu-events/jevents.py | 478 +++++++++++++++--- tools/perf/pmu-events/pmu-events.h | 40 +- tools/perf/tests/expand-cgroup.c | 25 +- tools/perf/tests/parse-metric.c | 77 +-- tools/perf/tests/pmu-events.c | 466 +++++++---------- tools/perf/util/metricgroup.c | 275 ++++++---- tools/perf/util/metricgroup.h | 5 +- tools/perf/util/pmu.c | 139 ++--- tools/perf/util/pmu.h | 10 +- tools/perf/util/s390-sample-raw.c | 50 +- 13 files changed, 1131 insertions(+), 706 deletions(-) create mode 100644 tools/perf/pmu-events/arch/test/test_soc/cpu/metrics.json
-- 2.37.1.595.g718a3a8f04-goog
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