On Mon, Mar 21, 2022 at 4:08 PM Kui-Feng Lee <kuifeng@xxxxxx> wrote:
>
> Collect the information of per-cpu variables from encoders of worker
> threads to the primary encoder.
>
> btf_encoder store per-cpu info separately, not in btf. Previously, it
> merged only btf types generated by worker threads. So, some of the
> per-cpu info was missing.
>
> Signed-off-by: Kui-Feng Lee <kuifeng@xxxxxx>
> ---
I've applied this locally and tested, it all looks good, thanks! I'm
keeping this applied locally until Arnaldo pushes this to master :)
Acked-by: Andrii Nakryiko <andrii@xxxxxxxxxx>
Tested-by: Andrii Nakryiko <andrii@xxxxxxxxxx>
> btf_encoder.c | 21 +++++++++++++++++++++
> btf_encoder.h | 2 ++
> pahole.c | 2 +-
> 3 files changed, 24 insertions(+), 1 deletion(-)
>
> diff --git a/btf_encoder.c b/btf_encoder.c
> index fa29824..1a42094 100644
> --- a/btf_encoder.c
> +++ b/btf_encoder.c
> @@ -606,6 +606,27 @@ static int32_t btf_encoder__add_var_secinfo(struct btf_encoder *encoder, uint32_
> return gobuffer__add(&encoder->percpu_secinfo, &si, sizeof(si));
> }
>
> +int32_t btf_encoder__add_encoder(struct btf_encoder *encoder, struct btf_encoder *other)
> +{
> + struct gobuffer *var_secinfo_buf = &other->percpu_secinfo;
> + size_t sz = gobuffer__size(var_secinfo_buf);
> + uint16_t nr_var_secinfo = sz / sizeof(struct btf_var_secinfo);
> + uint32_t type_id;
> + uint32_t next_type_id = btf__type_cnt(encoder->btf);
> + int32_t i, id;
> + struct btf_var_secinfo *vsi;
> +
> + for (i = 0; i < nr_var_secinfo; i++) {
> + vsi = (struct btf_var_secinfo *)var_secinfo_buf->entries + i;
> + type_id = next_type_id + vsi->type - 1; /* Type ID starts from 1 */
> + id = btf_encoder__add_var_secinfo(encoder, type_id, vsi->offset, vsi->size);
> + if (id < 0)
> + return id;
> + }
> +
> + return btf__add_btf(encoder->btf, other->btf);
> +}
> +
> static int32_t btf_encoder__add_datasec(struct btf_encoder *encoder, const char *section_name)
> {
> struct gobuffer *var_secinfo_buf = &encoder->percpu_secinfo;
> diff --git a/btf_encoder.h b/btf_encoder.h
> index 0f0eee8..339fae2 100644
> --- a/btf_encoder.h
> +++ b/btf_encoder.h
> @@ -31,4 +31,6 @@ struct btf_encoder *btf_encoders__next(struct btf_encoder *encoder);
>
> struct btf *btf_encoder__btf(struct btf_encoder *encoder);
>
> +int btf_encoder__add_encoder(struct btf_encoder *encoder, struct btf_encoder *other);
> +
> #endif /* _BTF_ENCODER_H_ */
> diff --git a/pahole.c b/pahole.c
> index f7c7966..a909b22 100644
> --- a/pahole.c
> +++ b/pahole.c
> @@ -2867,7 +2867,7 @@ static int pahole_threads_collect(struct conf_load *conf, int nr_threads, void *
> */
> if (!threads[i]->btf || threads[i]->encoder == btf_encoder)
> continue; /* The primary btf_encoder */
> - err = btf__add_btf(btf_encoder__btf(btf_encoder), threads[i]->btf);
> + err = btf_encoder__add_encoder(btf_encoder, threads[i]->encoder);
> if (err < 0)
> goto out;
> btf_encoder__delete(threads[i]->encoder);
> --
> 2.30.2
>
