netdev - Re: [PATCH v6 bpf-next 0/4] bpftool: introduce prog profile

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Message-ID: <56e69208-17d8-d4f1-cd3a-77fc881aa80e@iogearbox.net>
Date:   Tue, 10 Mar 2020 00:06:15 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Song Liu <songliubraving@...com>, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Cc:     quentin@...valent.com, kernel-team@...com, ast@...nel.org,
        arnaldo.melo@...il.com, jolsa@...nel.org
Subject: Re: [PATCH v6 bpf-next 0/4] bpftool: introduce prog profile

On 3/9/20 6:32 PM, 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 v5 => v6:
> 1. Use new header bpf_tracing.h (Yonghong).
> 
> Changes v4 => v5:
> 1. Adjust perf_event_attr for the events (Jiri).
> 
> 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).
> 
> 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
>    ybpftool: bash completion for "bpftool prog profile"

Applied and fixed subject typo above, thanks.

Please follow-up with a feature probe to support older clang/llvm versions.

>    bpftool: fix typo in bash-completion