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Subject[PATCH v3 0/3] Rewrite jevents program in python
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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.

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 (3):
perf jevents: Add python converter script
perf jevents: Switch build to use jevents.py
perf jevents: Remove jevents.c

tools/perf/Makefile.config | 19 +
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 | 392 +++++++
tools/perf/pmu-events/jsmn.h | 68 --
tools/perf/pmu-events/json.c | 162 ---
tools/perf/pmu-events/json.h | 39 -
9 files changed, 444 insertions(+), 1630 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

--
2.36.1.255.ge46751e96f-goog

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