mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-08-09 06:14:34 +02:00
Ian RogersandArnaldo Carvalho de Melo
bb922345ee
Currently, jevents.py emits both the massive 2.8 MB big_c_string literal
and tens of thousands of compact_pmu_event struct arrays into a single
pmu-events.c compilation unit. Compiling this giant file takes ~2.2 seconds
on a single CPU core during Kbuild startup.
Refactor jevents.py to emit big_c_string into a dedicated
pmu-events-string.c compilation unit. This allows Kbuild to compile
pmu-events.o and pmu-events-string.o simultaneously in parallel across
two separate CPU cores, preserving 100% string deduplication and zero
dynamic ELF relocations while cutting C compilation latency in half.
Add pmu-events-string.c to tools/perf/.gitignore to ensure in-tree Kbuild
runs do not leave untracked generated files in the working directory.
To guarantee 100% backward compatibility with GNU Make 4.0+ (avoiding the
Make 4.3+ grouped target &: syntax which causes older Make versions like
4.2.1 to spawn multiple concurrent jevents.py processes during parallel
builds), implement a robust dependency chaining pattern:
$(PMU_EVENTS_C): $(JEVENTS_DEPS)
$(PMU_EVENTS_STRING_C): $(PMU_EVENTS_C)
@:
This ensures jevents.py is invoked exactly once. If jevents.py aborts
early, Make's .DELETE_ON_ERROR: purges pmu-events.c, guaranteeing that
subsequent Make invocations correctly re-execute the script and overwrite
pmu-events-string.c. In jevents.py, explicitly close output_file first
and output_string_file second at the tail of main() to guarantee that
pmu-events-string.c receives a filesystem timestamp greater than or equal
to pmu-events.c, completely avoiding redundant incremental rebuilds.
Reviewed-by: Namhyung Kim <namhyung@kernel.org>
Assisted-by: Gemini:gemini-3.1-pro-preview
Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: James Clark <james.clark@linaro.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Alexandre Chartre <alexandre.chartre@oracle.com>
Cc: Alexandre Ghiti <alex@ghiti.fr>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Ankur Arora <ankur.a.arora@oracle.com>
Cc: Collin Funk <collin.funk1@gmail.com>
Cc: Costa Shulyupin <costa.shul@redhat.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Dapeng Mi <dapeng1.mi@linux.intel.com>
Cc: David Sterba <dsterba@suse.com>
Cc: Dmitrii Dolgov <9erthalion6@gmail.com>
Cc: Eduard Zingerman <eddyz87@gmail.com>
Cc: Howard Chu <howardchu95@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Cc: Leo Yan <leo.yan@arm.com>
Cc: Markus Mayer <mmayer@broadcom.com>
Cc: Martin KaFai Lau <martin.lau@linux.dev>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Terrell <terrelln@fb.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Walmsley <pjw@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Quentin Monnet <qmo@kernel.org>
Cc: Ricky Ringler <ricky.ringler@proton.me>
Cc: Song Liu <song@kernel.org>
Cc: Swapnil Sapkal <swapnil.sapkal@amd.com>
Cc: Thomas Falcon <thomas.falcon@intel.com>
Cc: Tomas Glozar <tglozar@redhat.com>
Cc: Yonghong Song <yonghong.song@linux.dev>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
61 lines
1.0 KiB
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61 lines
1.0 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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PERF-CFLAGS
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PERF-GUI-VARS
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PERF-VERSION-FILE
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FEATURE-DUMP
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perf
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!include/perf/
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perf-read-vdso32
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perf-read-vdsox32
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perf-help
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perf-record
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perf-report
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perf-stat
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perf-top
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perf*.1
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perf*.xml
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perf*.html
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common-cmds.h
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perf*.data
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perf*.data.old
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output.svg
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perf-archive
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perf-iostat
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tags
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TAGS
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stats-*.csv
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cscope*
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config.mak
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config.mak.autogen
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*-bison.*
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*-flex.*
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*.pyc
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*.pyo
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*.stdout
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.config-detected
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util/intel-pt-decoder/inat-tables.c
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arch/*/include/generated/
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trace/beauty/generated/
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pmu-events/arch/common/common/legacy-cache.json
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pmu-events/pmu-events.c
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pmu-events/pmu-events-string.c
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pmu-events/jevents
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pmu-events/metric_test.log
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pmu-events/empty-pmu-events.log
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pmu-events/test-empty-pmu-events.c
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*.shellcheck_log
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pmu-events/arch/**/extra-metrics.json
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pmu-events/arch/**/extra-metricgroups.json
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tests/shell/*.shellcheck_log
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tests/shell/coresight/*.shellcheck_log
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tests/shell/lib/*.shellcheck_log
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feature/
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libapi/
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libbpf/
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libperf/
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libsubcmd/
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libsymbol/
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fixdep
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Documentation/doc.dep
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python_ext_build/
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