Re: [PATCH] selftests/bpf: Remove duplicate copies of the arena spinlock qnodes

[Daniel Borkmann]

On 8/3/26 2:18 AM, Changwoo Min wrote:
> bpf_arena_spin_lock.h defines its 64KB qnodes array in the header, so
> every translation unit including it emits a copy. __weak makes them all
> resolve to one instance, but bpftool gen object merges only the symbols
> and concatenates each input's .addr_space.1 bytes, leaving the surplus
> copies unreferenced in the linked object.
>
> libarena links ten such units, so nine copies were dead weight (bytes):
>
>    object                             before       after
>    -----------------------------------------------------
>    .addr_space.1 in libarena.bpf.o    676200       86376
>    libarena.skel.h                   2100123      892371
>    libarena_asan.skel.h              2641124     1466477
>
> Declare qnodes in the header and let each program define it once:
> libarena in src/common.bpf.c, and the arena_spin_lock test beside the
> lock it guards.
>
> Tested with test_progs -t arena_spin_lock and -t libarena.
>
> Signed-off-by: Changwoo Min <changwoo@xxxxxxxxxx>
This doesn't apply cleanly, could you respin against latest bpf-next?

Thanks,
Daniel