perf tools: Save bpf_prog_info and BTF of new BPF programs
authorSong Liu <songliubraving@fb.com>
Tue, 12 Mar 2019 05:30:51 +0000 (22:30 -0700)
committerArnaldo Carvalho de Melo <acme@redhat.com>
Thu, 21 Mar 2019 14:27:04 +0000 (11:27 -0300)
commitd56354dc49091e33d9ffca732ac913ed2df70537
tree572c4da63acf88557aa79703f703af62b83b4ecb
parent657ee5531903339b06697581532ed32d4762526e
perf tools: Save bpf_prog_info and BTF of new BPF programs

To fully annotate BPF programs with source code mapping, 4 different
information are needed:

    1) PERF_RECORD_KSYMBOL
    2) PERF_RECORD_BPF_EVENT
    3) bpf_prog_info
    4) btf

This patch handles 3) and 4) for BPF programs loaded after 'perf
record|top'.

For timely process of these information, a dedicated event is added to
the side band evlist.

When PERF_RECORD_BPF_EVENT is received via the side band event, the
polling thread gathers 3) and 4) vis sys_bpf and store them in perf_env.

This information is saved to perf.data at the end of 'perf record'.

Committer testing:

The 'wakeup_watermark' member in 'struct perf_event_attr' is inside a
unnamed union, so can't be used in a struct designated initialization
with older gccs, get it out of that, isolating as 'attr.wakeup_watermark
= 1;' to work with all gcc versions.

We also need to add '--no-bpf-event' to the 'perf record'
perf_event_attr tests in 'perf test', as the way that that test goes is
to intercept the events being setup and looking if they match the fields
described in the control files, since now it finds first the side band
event used to catch the PERF_RECORD_BPF_EVENT, they all fail.

With these issues fixed:

Same scenario as for testing BPF programs loaded before 'perf record' or
'perf top' starts, only start the BPF programs after 'perf record|top',
so that its information get collected by the sideband threads, the rest
works as for the programs loaded before start monitoring.

Add missing 'inline' to the bpf_event__add_sb_event() when
HAVE_LIBBPF_SUPPORT is not defined, fixing the build in systems without
binutils devel files installed.

Signed-off-by: Song Liu <songliubraving@fb.com>
Reviewed-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stanislav Fomichev <sdf@google.com>
Link: http://lkml.kernel.org/r/20190312053051.2690567-16-songliubraving@fb.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
28 files changed:
tools/perf/builtin-record.c
tools/perf/builtin-top.c
tools/perf/tests/attr/test-record-C0
tools/perf/tests/attr/test-record-basic
tools/perf/tests/attr/test-record-branch-any
tools/perf/tests/attr/test-record-branch-filter-any
tools/perf/tests/attr/test-record-branch-filter-any_call
tools/perf/tests/attr/test-record-branch-filter-any_ret
tools/perf/tests/attr/test-record-branch-filter-hv
tools/perf/tests/attr/test-record-branch-filter-ind_call
tools/perf/tests/attr/test-record-branch-filter-k
tools/perf/tests/attr/test-record-branch-filter-u
tools/perf/tests/attr/test-record-count
tools/perf/tests/attr/test-record-data
tools/perf/tests/attr/test-record-freq
tools/perf/tests/attr/test-record-graph-default
tools/perf/tests/attr/test-record-graph-dwarf
tools/perf/tests/attr/test-record-graph-fp
tools/perf/tests/attr/test-record-group
tools/perf/tests/attr/test-record-group-sampling
tools/perf/tests/attr/test-record-group1
tools/perf/tests/attr/test-record-no-buffering
tools/perf/tests/attr/test-record-no-inherit
tools/perf/tests/attr/test-record-no-samples
tools/perf/tests/attr/test-record-period
tools/perf/tests/attr/test-record-raw
tools/perf/util/bpf-event.c
tools/perf/util/bpf-event.h