On Mon, Mar 04, 2019 at 07:43:50PM +0000, Song Liu wrote:
>
>
> > On Mar 4, 2019, at 5:52 AM, Jiri Olsa <jo...@redhat.com> wrote:
> >
> > On Wed, Feb 27, 2019 at 09:06:36PM -0800, Song Liu wrote:
> >> btf contains information necessary to annotate bpf programs. This patch
> >> saves btf for bpf programs loaded in the system.
> >>
> >> Signed-off-by: Song Liu <songliubrav...@fb.com>
> >> ---
> >> tools/perf/util/bpf-event.c | 24 ++++++++++++++
> >> tools/perf/util/bpf-event.h | 7 ++++
> >> tools/perf/util/env.c | 65 +++++++++++++++++++++++++++++++++++++
> >> tools/perf/util/env.h | 4 +++
> >> 4 files changed, 100 insertions(+)
> >>
> >> diff --git a/tools/perf/util/bpf-event.c b/tools/perf/util/bpf-event.c
> >> index ce81b2c43a51..370b830f2433 100644
> >> --- a/tools/perf/util/bpf-event.c
> >> +++ b/tools/perf/util/bpf-event.c
> >> @@ -34,6 +34,29 @@ int machine__process_bpf_event(struct machine *machine
> >> __maybe_unused,
> >> return 0;
> >> }
> >>
> >> +static int perf_env__fetch_btf(struct perf_env *env,
> >> + u32 btf_id,
> >> + struct btf *btf)
> >> +{
> >> + struct btf_node *node;
> >> + u32 data_size;
> >> + const void *data;
> >> +
> >> + data = btf__get_raw_data(btf, &data_size);
> >> +
> >> + node = malloc(data_size + sizeof(struct btf_node));
> >> +
> >> + if (!node)
> >> + return -1;
> >> +
> >> + node->id = btf_id;
> >> + node->data_size = data_size;
> >> + memcpy(node->data, data, data_size);
> >
> > why don't we store just struct btf itself?
> >
> > thanks,
> > jirka
>
> In current libbpf design, definition of "struct btf" is private
> to tools/lib/bpf/btf.c. So we cannot copy the struct itself.
ok
jirka
