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scripts/pahole-flags.sh: Parse DWARF and generate BTF with multithreading.

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Pass a "-j" argument to pahole if possible to reduce the time of
generating BTF info.

Since v1.22, pahole can parse DWARF and generate BTF with
multithreading to speed up the conversion.  It will reduce the overall
build time of the kernel for seconds.

v3 fixes whitespaces and improves the commit description.
v2 checks the version of pahole to enable multithreading only if possible.

[v2] https://lore.kernel.org/bpf/20220216193431.2691015-1-kuifeng@fb.com/
[v1] https://lore.kernel.org/bpf/20220216004616.2079689-1-kuifeng@fb.com/

Signed-off-by: Kui-Feng Lee <kuifeng@fb.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20220217175427.649713-1-kuifeng@fb.com
This commit is contained in:
Kui-Feng Lee 2022-02-17 09:54:27 -08:00 committed by Andrii Nakryiko
parent 6966d4c442
commit b4f7278642
1 changed files with 3 additions and 0 deletions
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3
scripts/pahole-flags.sh
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@ -16,5 +16,8 @@ fi
if [ "${pahole_ver}" -ge "121" ]; then if [ "${pahole_ver}" -ge "121" ]; then
extra_paholeopt="${extra_paholeopt} --btf_gen_floats" extra_paholeopt="${extra_paholeopt} --btf_gen_floats"
fi fi
if [ "${pahole_ver}" -ge "122" ]; then
extra_paholeopt="${extra_paholeopt} -j"
fi
echo ${extra_paholeopt} echo ${extra_paholeopt}