linux-kernel - [PATCHES/RFC 1/5] perf bench uprobe + BPF skel

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Message-ID: <20230719204910.539044-1-acme@kernel.org>
Date:   Wed, 19 Jul 2023 17:49:05 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Clark Williams <williams@...hat.com>,
        Kate Carcia <kcarcia@...hat.com>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: [PATCHES/RFC 1/5] perf bench uprobe + BPF skel

Hi,

	This adds a 'perf bench' to test the overhead of uprobes + BPF
programs, for now just a few simple tests, but I plan to make it
possible to specify the functions to attach the uprobe + BPF, other BPF
operations dealing with maps, etc.

	This is how it looks like now:

  [root@...e ~]# perf bench uprobe all
  # Running uprobe/baseline benchmark...
  # Executed 1,000 usleep(1000) calls
       Total time: 1,053,963 usecs
  
   1,053.963 usecs/op
  
  # Running uprobe/empty benchmark...
  # Executed 1,000 usleep(1000) calls
       Total time: 1,056,293 usecs +2,330 to baseline
  
   1,056.293 usecs/op 2.330 usecs/op to baseline
  
  # Running uprobe/trace_printk benchmark...
  # Executed 1,000 usleep(1000) calls
       Total time: 1,056,977 usecs +3,014 to baseline +684 to previous
  
   1,056.977 usecs/op 3.014 usecs/op to baseline 0.684 usecs/op to previous
  
  [root@...e ~]

I put it here:

  https://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git/commit/?h=perf-bench-uprobe

  git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git perf-bench-uprobe

Further ideas, problems?

- Arnaldo



Arnaldo Carvalho de Melo (5):
  perf bench uprobe: Add benchmark to test uprobe overhead
  perf bench uprobe: Print diff to baseline
  perf bench uprobe: Show diff to previous
  perf bench uprobe empty: Add entry attaching an empty BPF program
  perf bench uprobe trace_printk: Add entry attaching an BPF program that does a trace_printk

 tools/perf/Documentation/perf-bench.txt     |   3 +
 tools/perf/Makefile.perf                    |   1 +
 tools/perf/bench/Build                      |   1 +
 tools/perf/bench/bench.h                    |   3 +
 tools/perf/bench/uprobe.c                   | 198 ++++++++++++++++++++
 tools/perf/builtin-bench.c                  |   8 +
 tools/perf/util/bpf_skel/bench_uprobe.bpf.c |  23 +++
 7 files changed, 237 insertions(+)
 create mode 100644 tools/perf/bench/uprobe.c
 create mode 100644 tools/perf/util/bpf_skel/bench_uprobe.bpf.c

-- 
2.41.0