[PATCH v3 bpf-next] scripts/pahole-flags.sh: Parse DWARF and generate BTF with multithreading.

[PATCH v3 bpf-next] scripts/pahole-flags.sh: Parse DWARF and generate BTF with multithreading.

[Kui-Feng Lee]

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>
Acked-by: Yonghong Song <yhs@fb.com>
---
 scripts/pahole-flags.sh | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/scripts/pahole-flags.sh b/scripts/pahole-flags.sh
index c293941612e7..0d99ef17e4a5 100755
--- a/scripts/pahole-flags.sh
+++ b/scripts/pahole-flags.sh
@@ -16,5 +16,8 @@ fi
 if [ "${pahole_ver}" -ge "121" ]; then
 	extra_paholeopt="${extra_paholeopt} --btf_gen_floats"
 fi
+if [ "${pahole_ver}" -ge "122" ]; then
+	extra_paholeopt="${extra_paholeopt} -j"
+fi
 
 echo ${extra_paholeopt}
-- 
2.30.2

Re: [PATCH v3 bpf-next] scripts/pahole-flags.sh: Parse DWARF and generate BTF with multithreading.

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to bpf/bpf-next.git (master)
by Andrii Nakryiko <andrii@kernel.org>:

On Thu, 17 Feb 2022 09:54:27 -0800 you wrote:
> 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.
> 
> [...]

Here is the summary with links:
  - [v3,bpf-next] scripts/pahole-flags.sh: Parse DWARF and generate BTF with multithreading.
    https://git.kernel.org/bpf/bpf-next/c/b4f72786429c

You are awesome, thank you!
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