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Date:   Fri, 11 Jan 2019 13:26:56 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Song Liu <songliubraving@...com>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        peterz@...radead.org, ast@...nel.org, daniel@...earbox.net,
        kernel-team@...com, dsahern@...il.com
Subject: Re: [PATCH v7 perf, bpf-next 0/8] reveal invisible bpf programs

Em Thu, Jan 10, 2019 at 04:19:25PM -0800, Song Liu escreveu:
> This set catches symbol for all bpf programs loaded/unloaded
> before/during/after perf-record run PERF_RECORD_KSYMBOL and
> PERF_RECORD_BPF_EVENT.
> 
> PERF_RECORD_KSYMBOL and PERF_RECORD_BPF_EVENT includes key information
> of a bpf program load and unload. They are sent through perf ringbuffer,
> and stored in perf.data. PERF_RECORD_KSYMBOL includes basic information
> for simple profiling. It is ON by default. PERF_RECORD_BPF_EVENT is
> used to gather more information of the bpf program. It is necessary for
> perf-annotate of bpf programs.
> 
> Before this patch, perf-report will not be able to recover symbols of
> bpf programs once the programs are unloaded.
> 
> This is to follow up Alexei's early effort [2] to show bpf programs via
> mmap events.
> 
> Thanks,
> Song
> 
> Changes v6 -> PATCH v7:
> 1. Split "[3/7] introduce PERF_RECORD_BPF_EVENT" into two commits:
>      [3/8] introduce PERF_RECORD_BPF_EVENT
>      [5/8] emit PERF_RECORD_KSYMBOL for BPF program load/unload

Thanks, I'm trying now to build a kernel/tools combo to test this.
 
> Changes v5 -> PATCH v6:
> 1. Reduce len in PERF_RECORD_KSYMBOL from u64 to u32. Use the 32 free bits
>    for ksym_type (u16) and flags (u16).
> 
> Changes v4 -> PATCH v5:
> 1. Fixed build error reported by kbuild test bot.
> 
> Changes v3 -> PATCH v4:
> 1. Split information about bpf program  into PERF_RECORD_KSYMBOL (with
>    name, addr, len); and PERF_RECORD_BPF_EVENT PERF_RECORD_BPF_EVENT
>    (with id, tag);
> 2. Split the implementation in kernel and user space.
> 
> Changes v2 -> PATCH v3:
> 1. Rebase on bpf-next tree, and on top of BPF sub program tag patches [1]
>    for latest information in bpf_prog_info.
> 2. Complete handling and synthesizing PERF_RECORD_BPF_EVENT in perf.
> 
> Changes v1 -> PATCH v2:
> 1. Only 3 of the 5 patches in v1, to focus on ABI first;
> 2. Generate PERF_RECORD_BPF_EVENT per bpf sub program instead of per prog;
> 3. Modify PERF_RECORD_BPF_EVENT with more details (addr, len, name),
>    so that it can be used for basic profiling without calling sys_bpf.
> 
> Changes RFC -> PATCH v1:
> 1. In perf-record, poll vip events in a separate thread;
> 2. Add tag to bpf prog name;
> 3. Small refactorings.
> 
> [1] https://patchwork.ozlabs.org/project/netdev/list/?series=81037
> [2] https://www.spinics.net/lists/netdev/msg524232.html
> 
> Song Liu (8):
>   perf, bpf: Introduce PERF_RECORD_KSYMBOL
>   sync tools/include/uapi/linux/perf_event.h
>   perf, bpf: introduce PERF_RECORD_BPF_EVENT
>   sync tools/include/uapi/linux/perf_event.h
>   perf, bpf: emit PERF_RECORD_KSYMBOL for BPF program load/unload
>   perf util: handle PERF_RECORD_KSYMBOL
>   perf util: handle PERF_RECORD_BPF_EVENT
>   perf tools: synthesize PERF_RECORD_* for loaded BPF programs
> 
>  include/linux/filter.h                |   7 +
>  include/linux/perf_event.h            |  19 +++
>  include/uapi/linux/perf_event.h       |  53 ++++++-
>  kernel/bpf/core.c                     |   2 +-
>  kernel/bpf/syscall.c                  |   2 +
>  kernel/events/core.c                  | 218 ++++++++++++++++++++++++-
>  tools/include/uapi/linux/perf_event.h |  53 ++++++-
>  tools/perf/builtin-record.c           |   7 +
>  tools/perf/perf.h                     |   1 +
>  tools/perf/util/Build                 |   2 +
>  tools/perf/util/bpf-event.c           | 220 ++++++++++++++++++++++++++
>  tools/perf/util/bpf-event.h           |  16 ++
>  tools/perf/util/event.c               |  41 +++++
>  tools/perf/util/event.h               |  36 +++++
>  tools/perf/util/evsel.c               |  19 +++
>  tools/perf/util/evsel.h               |   2 +
>  tools/perf/util/machine.c             |  60 +++++++
>  tools/perf/util/machine.h             |   3 +
>  tools/perf/util/session.c             |   8 +
>  tools/perf/util/tool.h                |   5 +-
>  20 files changed, 769 insertions(+), 5 deletions(-)
>  create mode 100644 tools/perf/util/bpf-event.c
>  create mode 100644 tools/perf/util/bpf-event.h
> 
> --
> 2.17.1

-- 

- Arnaldo

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