netdev - Re: [PATCH v4 bpf-next 0/4] bpftool: introduce prog profile

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Date:   Wed, 4 Mar 2020 20:08:07 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Song Liu <songliubraving@...com>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org, quentin@...valent.com,
        kernel-team@...com, ast@...nel.org, daniel@...earbox.net,
        arnaldo.melo@...il.com, jolsa@...nel.org
Subject: Re: [PATCH v4 bpf-next 0/4] bpftool: introduce prog profile

On Wed, Mar 04, 2020 at 10:07:06AM -0800, Song Liu wrote:
> This set introduces bpftool prog profile command, which uses hardware
> counters to profile BPF programs.
> 
> This command attaches fentry/fexit programs to a target program. These two
> programs read hardware counters before and after the target program and
> calculate the difference.
> 
> Changes v3 => v4:
> 1. Simplify err handling in profile_open_perf_events() (Quentin);
> 2. Remove redundant p_err() (Quentin);
> 3. Replace tab with space in bash-completion; (Quentin);
> 4. Fix typo _bpftool_get_map_names => _bpftool_get_prog_names (Quentin).

hum, I'm getting:

	[jolsa@...l-r440-01 bpftool]$ pwd
	/home/jolsa/linux-perf/tools/bpf/bpftool
	[jolsa@...l-r440-01 bpftool]$ make
	...
	make[1]: Leaving directory '/home/jolsa/linux-perf/tools/lib/bpf'
	  LINK     _bpftool
	make: *** No rule to make target 'skeleton/profiler.bpf.c', needed by 'skeleton/profiler.bpf.o'.  Stop.

jirka

> 
> Changes v2 => v3:
> 1. Change order of arguments (Quentin), as:
>      bpftool prog profile PROG [duration DURATION] METRICs
> 2. Add bash-completion for bpftool prog profile (Quentin);
> 3. Fix build of selftests (Yonghong);
> 4. Better handling of bpf_map_lookup_elem() returns (Yonghong);
> 5. Improve clean up logic of do_profile() (Yonghong);
> 6. Other smaller fixes/cleanups.
> 
> Changes RFC => v2:
> 1. Use new bpf_program__set_attach_target() API;
> 2. Update output format to be perf-stat like (Alexei);
> 3. Incorporate skeleton generation into Makefile;
> 4. Make DURATION optional and Allow Ctrl-C (Alexei);
> 5. Add calcated values "insn per cycle" and "LLC misses per million isns".
> 
> Song Liu (4):
>   bpftool: introduce "prog profile" command
>   bpftool: Documentation for bpftool prog profile
>   bpftool: bash completion for "bpftool prog profile"
>   bpftool: fix typo in bash-completion
> 
>  .../bpftool/Documentation/bpftool-prog.rst    |  19 +
>  tools/bpf/bpftool/Makefile                    |  18 +
>  tools/bpf/bpftool/bash-completion/bpftool     |  47 +-
>  tools/bpf/bpftool/prog.c                      | 425 +++++++++++++++++-
>  tools/bpf/bpftool/skeleton/profiler.bpf.c     | 171 +++++++
>  tools/bpf/bpftool/skeleton/profiler.h         |  47 ++
>  tools/scripts/Makefile.include                |   1 +
>  7 files changed, 725 insertions(+), 3 deletions(-)
>  create mode 100644 tools/bpf/bpftool/skeleton/profiler.bpf.c
>  create mode 100644 tools/bpf/bpftool/skeleton/profiler.h
> 
> --
> 2.17.1
>