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| author | Ihor Solodrai <ihor.solodrai@pm.me> | 2024-08-28 19:46:23 +0200 |
|---|---|---|
| committer | Andrii Nakryiko <andrii@kernel.org> | 2024-08-30 20:54:14 +0200 |
| commit | 2ad6d23f465a4f851e3bcf6d74c315ce7b2c205b (patch) | |
| tree | 3000c6c0a7ffede66896137e75d7205270bc2ce0 /lib | |
| parent | selftests/bpf: Specify libbpf headers required for %.bpf.o progs (diff) | |
| download | linux-2ad6d23f465a4f851e3bcf6d74c315ce7b2c205b.tar.xz linux-2ad6d23f465a4f851e3bcf6d74c315ce7b2c205b.zip | |
selftests/bpf: Do not update vmlinux.h unnecessarily
%.bpf.o objects depend on vmlinux.h, which makes them transitively
dependent on unnecessary libbpf headers. However vmlinux.h doesn't
actually change as often.
When generating vmlinux.h, compare it to a previous version and update
it only if there are changes.
Example of build time improvement (after first clean build):
$ touch ../../../lib/bpf/bpf.h
$ time make -j8
Before: real 1m37.592s
After: real 0m27.310s
Notice that %.bpf.o gen step is skipped if vmlinux.h hasn't changed.
Signed-off-by: Ihor Solodrai <ihor.solodrai@pm.me>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/CAEf4BzY1z5cC7BKye8=A8aTVxpsCzD=p1jdTfKC7i0XVuYoHUQ@mail.gmail.com
Link: https://lore.kernel.org/bpf/20240828174608.377204-2-ihor.solodrai@pm.me
Diffstat (limited to 'lib')
0 files changed, 0 insertions, 0 deletions