[v2,perf,bpf,00/11] perf annotation of BPF programs

Changes v1 to v2:
1. Fix compilation error with different feature-disassembler-four-args;
2. Fix a segfault in perf-record;
3. Split patches 5/9 and 6/9 so that perf_env changes and perf.data changes
   are in separate patches.

This series enables annotation of BPF programs in perf.

perf tool gathers information via sys_bpf and (optionally) stores them in
perf.data as headers.

Patch 1/11 fixes a minor issue in kernel;
Patch 2/11 to 4/11 introduce new helper functions and use them in perf and
     bpftool;
Patch 5/11 to 8/11 saves information of bpf program in perf_env;
Patch 9/11 adds --bpf-event options to perf-top;
Patch 10/11 enables annotation of bpf programs based on information
     gathered in 5/11 to 8/11;
Patch 11/11 handles information of short living BPF program that are loaded
     during perf-record or perf-top.

Commands tested during developments are perf-top, perf-record, perf-report,
and perf-annotate.

===================== Note on patch dependency  ========================
This set has dependency in both bpf-next tree and tip/perf/core. Current
version is developed on bpf-next tree with the following commits
cherry-picked from tip/perf/core:

(from 1/10 to 10/10)
commit 76193a94522f ("perf, bpf: Introduce PERF_RECORD_KSYMBOL")
commit d764ac646491 ("tools headers uapi: Sync tools/include/uapi/linux/perf_event.h")
commit 6ee52e2a3fe4 ("perf, bpf: Introduce PERF_RECORD_BPF_EVENT")
commit df063c83aa2c ("tools headers uapi: Sync tools/include/uapi/linux/perf_event.h")
commit 9aa0bfa370b2 ("perf tools: Handle PERF_RECORD_KSYMBOL")
commit 45178a928a4b ("perf tools: Handle PERF_RECORD_BPF_EVENT")
commit 7b612e291a5a ("perf tools: Synthesize PERF_RECORD_* for loaded BPF programs")
commit a40b95bcd30c ("perf top: Synthesize BPF events for pre-existing loaded BPF programs")
commit 6934058d9fb6 ("bpf: Add module name [bpf] to ksymbols for bpf programs")
commit 811184fb6977 ("perf bpf: Fix synthesized PERF_RECORD_KSYMBOL/BPF_EVENT")
========================================================================

This set is also available at:

https://github.com/liu-song-6/linux/tree/bpf-annotation

Thanks!!

Song Liu (11):
  perf, bpf: consider events with attr.bpf_event as side-band events
  bpf: libbpf: introduce bpf_program__get_prog_info_linear()
  bpf: bpftool: use bpf_program__get_prog_info_linear() in
    prog.c:do_dump()
  perf, bpf: synthesize bpf events with
    bpf_program__get_prog_info_linear()
  perf, bpf: save bpf_prog_info in a rbtree in perf_env
  perf, bpf: save bpf_prog_info information as headers to perf.data
  perf, bpf: save btf in a rbtree in perf_env
  perf, bpf: save btf information as headers to perf.data
  perf-top: add option --bpf-event
  perf, bpf: enable annotation of bpf program
  perf, bpf: save information about short living bpf programs

 kernel/events/core.c        |   3 +-
 tools/bpf/bpftool/prog.c    | 266 ++++++---------------------
 tools/lib/bpf/libbpf.c      | 251 +++++++++++++++++++++++++
 tools/lib/bpf/libbpf.h      |  63 +++++++
 tools/lib/bpf/libbpf.map    |   3 +
 tools/perf/Makefile.config  |   6 +-
 tools/perf/builtin-record.c |  15 +-
 tools/perf/builtin-top.c    |  15 +-
 tools/perf/util/annotate.c  | 149 ++++++++++++++-
 tools/perf/util/bpf-event.c | 354 +++++++++++++++++++++++++++---------
 tools/perf/util/bpf-event.h |  48 ++++-
 tools/perf/util/dso.c       |   1 +
 tools/perf/util/dso.h       |  33 ++--
 tools/perf/util/env.c       | 148 +++++++++++++++
 tools/perf/util/env.h       |  17 ++
 tools/perf/util/evlist.c    |  20 ++
 tools/perf/util/evlist.h    |   2 +
 tools/perf/util/header.c    | 231 ++++++++++++++++++++++-
 tools/perf/util/header.h    |   2 +
 tools/perf/util/symbol.c    |   1 +
 20 files changed, 1316 insertions(+), 312 deletions(-)

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2.17.1