* [PATCH dwarves] pahole, btf_encoder: Collect info of per-cpu varaibles from threads.
@ 2022-03-21 23:08 Kui-Feng Lee
2022-03-25 23:02 ` Andrii Nakryiko
0 siblings, 1 reply; 3+ messages in thread
From: Kui-Feng Lee @ 2022-03-21 23:08 UTC (permalink / raw)
To: arnaldo.melo, dwarves, ast, andrii, daniel; +Cc: Kui-Feng Lee
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@fb.com>
---
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
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [PATCH dwarves] pahole, btf_encoder: Collect info of per-cpu varaibles from threads.
2022-03-21 23:08 [PATCH dwarves] pahole, btf_encoder: Collect info of per-cpu varaibles from threads Kui-Feng Lee
@ 2022-03-25 23:02 ` Andrii Nakryiko
2022-03-26 14:51 ` Arnaldo Carvalho de Melo
0 siblings, 1 reply; 3+ messages in thread
From: Andrii Nakryiko @ 2022-03-25 23:02 UTC (permalink / raw)
To: Kui-Feng Lee
Cc: Arnaldo Carvalho de Melo, dwarves, Alexei Starovoitov,
Andrii Nakryiko, Daniel Borkmann
On Mon, Mar 21, 2022 at 4:08 PM Kui-Feng Lee <kuifeng@fb.com> 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@fb.com>
> ---
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@kernel.org>
Tested-by: Andrii Nakryiko <andrii@kernel.org>
> 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
>
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH dwarves] pahole, btf_encoder: Collect info of per-cpu varaibles from threads.
2022-03-25 23:02 ` Andrii Nakryiko
@ 2022-03-26 14:51 ` Arnaldo Carvalho de Melo
0 siblings, 0 replies; 3+ messages in thread
From: Arnaldo Carvalho de Melo @ 2022-03-26 14:51 UTC (permalink / raw)
To: Andrii Nakryiko
Cc: Kui-Feng Lee, Arnaldo Carvalho de Melo, dwarves,
Alexei Starovoitov, Andrii Nakryiko, Daniel Borkmann
Em Fri, Mar 25, 2022 at 04:02:13PM -0700, Andrii Nakryiko escreveu:
> On Mon, Mar 21, 2022 at 4:08 PM Kui-Feng Lee <kuifeng@fb.com> 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@fb.com>
> > ---
>
> 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@kernel.org>
> Tested-by: Andrii Nakryiko <andrii@kernel.org>
And from a quick look the code is really elegant, well done!
Applied and will push to the next branch, later today/tomorrow I'll push
it out to master after it passes the libbpf CI tests.
Thanks!
- Arnaldo
> > 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
> >
--
- Arnaldo
^ permalink raw reply [flat|nested] 3+ messages in thread
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2022-03-21 23:08 [PATCH dwarves] pahole, btf_encoder: Collect info of per-cpu varaibles from threads Kui-Feng Lee
2022-03-25 23:02 ` Andrii Nakryiko
2022-03-26 14:51 ` Arnaldo Carvalho de Melo
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