linux-kernel - Re: [PATCH v9 perf,bpf 00/15] perf annotation of BPF programs

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Date:   Tue, 12 Mar 2019 14:12:51 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Song Liu <songliubraving@...com>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        kernel-team@...com, peterz@...radead.org, acme@...hat.com,
        jolsa@...nel.org, namhyung@...nel.org, sdf@...ichev.me
Subject: Re: [PATCH v9 perf,bpf 00/15] perf annotation of BPF programs

On Mon, Mar 11, 2019 at 10:30:36PM -0700, Song Liu wrote:
> Changes v8 to v9:
> 1. Rebase on top of torvalds/master:
>     commit ea295481b6e313b4ea3ca2720ffcafd6005b5643 ;
> 2. Change perf-record option --bpf-event to --no-bpf-event.

Reviewed-by: Jiri Olsa <jolsa@...nel.org>

thanks for bearing with me ;-)

jirka


> 
> Changes v7 to v8:
> 1. Address issues suggested by Jiri and Stanislav.
> 
> Changes v6 to v7:
> 1. Fix minor issues suggested by Jiri.
> 
> Changes v5 to v6:
> 1. Improve side band evlist interface;
> 2. Minor style fixes.
> 
> Changes v4 to v5:
> 1. Rebase to latest bpf-next;
> 2. Add dependency of 94816add0005 from Arnaldo's tree;
> 3. More details in change logs;
> 4. Add perf_env__init() to init bpf related lock and rbtrees;
> 5. Small clean ups.
> 
> Changes v3 to v4:
> 1. Incorporate feedbacks from Jiri and Namhyung;
> 2. Fixed compilation error with different feature-disassembler-four-args;
> 3. Split some patches to smaller patches;
> 4. Improved error handleing in symbol__disassemble_bpf();
> 5. Made side band thread more generic;
> 6. Added comments as suggested.
> 
> Changes v2 to v3:
> 1. Remove unnecessary include in header files;
> 2. Improved error handling;
> 3. Better naming of functions, variables, etc.;
> 4. Enable bpf events by default for perf-top.
> 
> 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 1/15 changes --bpf-event option to --no-bpf-event;
> Patch 2/15 to 4/15 introduce new helper functions and use them in perf and
>      bpftool;
> Patch 5/15 to 9/15 saves information of bpf program in perf_env;
> Patch 10/15 adds --bpf-event options to perf-top;
> Patch 11/15 to 13/15 enables annotation of bpf progs based on information
>      gathered in 5/15 to 9/15;
> Patch 14/15 introduces side band polling thread that gathers information
>      for special kernel events during perf-record or perf-top.
> Patch 15/15 handles information of short living BPF program using the new
>      side band polling thread.
> 
> Commands tested during developments are perf-top, perf-record, perf-report,
> and perf-annotate.
> 
> This set is also available at:
> 
> https://github.com/liu-song-6/linux/tree/bpf-annotation-v9
> 
> Thanks!!
> 
> Song Liu (15):
>   perf-record: replace option --bpf-event with --no-bpf-event
>   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: change prototype of perf_event__synthesize_bpf_events()
>   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 --no-bpf-event
>   perf: add -lopcodes to feature-libbfd
>   perf, bpf: enable annotation of bpf program
>   perf, bpf: process PERF_BPF_EVENT_PROG_LOAD for annotation
>   perf: introduce side band thread
>   perf, bpf: save bpf_prog_info and btf of short living bpf programs
> 
>  tools/bpf/bpftool/prog.c     | 266 +++++++---------------------
>  tools/build/Makefile.feature |   6 +-
>  tools/lib/bpf/libbpf.c       | 251 ++++++++++++++++++++++++++
>  tools/lib/bpf/libbpf.h       |  63 +++++++
>  tools/lib/bpf/libbpf.map     |   3 +
>  tools/perf/Makefile.config   |  10 +-
>  tools/perf/builtin-record.c  |  11 +-
>  tools/perf/builtin-top.c     |  10 +-
>  tools/perf/perf.c            |   1 +
>  tools/perf/perf.h            |   2 +-
>  tools/perf/util/annotate.c   | 150 +++++++++++++++-
>  tools/perf/util/bpf-event.c  | 330 ++++++++++++++++++++++++++---------
>  tools/perf/util/bpf-event.h  |  33 +++-
>  tools/perf/util/dso.c        |   1 +
>  tools/perf/util/dso.h        |  32 ++--
>  tools/perf/util/env.c        | 151 ++++++++++++++++
>  tools/perf/util/env.h        |  24 +++
>  tools/perf/util/evlist.c     | 119 +++++++++++++
>  tools/perf/util/evlist.h     |  12 ++
>  tools/perf/util/evsel.c      |   2 +-
>  tools/perf/util/evsel.h      |   6 +
>  tools/perf/util/header.c     | 238 ++++++++++++++++++++++++-
>  tools/perf/util/header.h     |   2 +
>  tools/perf/util/session.c    |   1 +
>  tools/perf/util/symbol.c     |   1 +
>  25 files changed, 1409 insertions(+), 316 deletions(-)
> 
> --
> 2.17.1