Re: [PATCH 08/10] perf build: Enable jevents string compression when available

[sashiko-bot@kernel.org]

> Pass --compress=<available> to jevents.py during regular builds to
> enable block-indexed string compression (packing generated PMU event and
> metric strings into independently compressed ~8 KiB blocks decompressed
> on demand by (block_id << 16) | sub_offset), constructing the fallback
> list from CONFIG_ZSTD, CONFIG_ZLIB, CONFIG_LZMA, and none so jevents.py
> only emits decompression C code for libraries actually linked into perf
> (e.g. falling back to zlib when built with NO_LIBZSTD=1, or uncompressed
> strings when all three are disabled).
> 
> Expose JEVENTS_COMPRESS=<zstd|zlib|lzma|none> (or a comma-separated
> preference list) in Makefile.perf to override or disable compression, and
> track NO_JEVENTS, JEVENTS_ARCH, JEVENTS_MODEL, and the active compression
> selection in $(OUTPUT)pmu-events/jevents-flags so changing build flags
> triggers regeneration without rerunning jevents.py on incremental no-op
> builds. Also cover JEVENTS_COMPRESS=none in tools/perf/tests/make.
> 
> Signed-off-by: Ian Rogers <irogers@google.com>

Sashiko has reviewed this patch and found no issues.

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Sashiko AI review · https://sashiko.dev/#/patchset/20261113210822.3112700-1-irogers@google.com?part=8