Messages in this thread | | | From | Ian Rogers <> | Subject | [PATCH v4 0/4] Rewrite jevents program in python | Date | Tue, 14 Jun 2022 20:04:34 -0700 |
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New architectures bring new complexity, such as Intel's hybrid models. jevents provides an alternative to specifying events in the kernel and exposing them through sysfs, however, it is difficult to work with. For example, an error in the json input would yield an error message but no json file or location. It is also a challenge to update jsmn.c given its forked nature.
The changes here switch from jevents.c to a rewrite in python called jevents.py. This means there is a build time dependency on python, but such a dependency already exists for asciidoc (used to generate perf's man pages). If the build detects that python isn't present or is older than version 3.6 (released Dec. 2016) then an empty file is substituted for the generated one.
A challenge with this code is in avoiding regressions. For this reason the jevents.py produces identical output to jevents.c, validated with a test script and build target.
v4. Fixes the build for systems with python2 installed by adding a patch that makes python3 the preferred python (Reported-by: John Garry <john.garry@huawei.com>). It also fixes a bash-ism in the jevents-test.sh and fixes the handling of an empty string for a metric BriefDescription as one was added for sapphirerapids in the metric Execute. v3. Updates the patches for merged changes (on acme/tmp.perf/core). Re-runs all comparisons to make sure the generated pmu-events.c isn't altered at all by this change. Adds the jevents.c ExtSel fix in: https://lore.kernel.org/lkml/20220525140410.1706851-1-zhengjun.xing@linux.intel.com/ Bumps the python version from 3.5 to 3.6, as f-strings weren't introduced until 3.6.
v2. Fixes the build for architectures that don't have pmu-events json (Suggested-by: John Garry <john.garry@huawei.com>) and fixes the build for python not being present or too old (Suggested-by: Peter Zijlstra <peterz@infradead.org>/John Garry <john.garry@huawei.com>).
Ian Rogers (4): perf python: Prefer python3 perf jevents: Add python converter script perf jevents: Switch build to use jevents.py perf jevents: Remove jevents.c
tools/perf/Makefile.config | 27 +- tools/perf/Makefile.perf | 16 +- tools/perf/pmu-events/Build | 15 +- tools/perf/pmu-events/empty-pmu-events.c | 21 + tools/perf/pmu-events/jevents.c | 1342 ---------------------- tools/perf/pmu-events/jevents.py | 394 +++++++ tools/perf/pmu-events/jsmn.h | 68 -- tools/perf/pmu-events/json.c | 162 --- tools/perf/pmu-events/json.h | 39 - 9 files changed, 450 insertions(+), 1634 deletions(-) create mode 100644 tools/perf/pmu-events/empty-pmu-events.c delete mode 100644 tools/perf/pmu-events/jevents.c create mode 100755 tools/perf/pmu-events/jevents.py delete mode 100644 tools/perf/pmu-events/jsmn.h delete mode 100644 tools/perf/pmu-events/json.c delete mode 100644 tools/perf/pmu-events/json.h
-- 2.34.1
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