linux-kernel - Re: [RFC 0/4] perf record: Implement off-cpu profiling with BPF (v1)

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Date:   Fri, 22 Apr 2022 12:11:32 +0200
From:   Jiri Olsa <olsajiri@...il.com>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>, Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Ian Rogers <irogers@...gle.com>,
        Song Liu <songliubraving@...com>, Hao Luo <haoluo@...gle.com>,
        bpf@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Blake Jones <blakejones@...gle.com>
Subject: Re: [RFC 0/4] perf record: Implement off-cpu profiling with BPF (v1)

On Thu, Apr 21, 2022 at 10:33:57PM -0700, Namhyung Kim wrote:

SNIP

> The perf bench sched messaging created 400 processes to send/receive
> messages through unix sockets.  It spent a large portion of cpu cycles
> for audit filter and read/copy the messages while most of the
> offcpu-time was in read and write calls.
> 
> You can get the code from 'perf/offcpu-v1' branch in my tree at
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/namhyung/linux-perf.git
> 
> Enjoy! :)

  CC      builtin-record.o
builtin-record.c:52:10: fatal error: util/off_cpu.h: No such file or directory
   52 | #include "util/off_cpu.h"

forgot to add util/off_cpu.h ?

jirka

> 
> Thanks,
> Namhyung
> 
> 
> Namhyung Kim (4):
>   perf report: Do not extend sample type of bpf-output event
>   perf record: Enable off-cpu analysis with BPF
>   perf record: Implement basic filtering for off-cpu
>   perf record: Handle argument change in sched_switch
> 
>  tools/perf/Makefile.perf               |   1 +
>  tools/perf/builtin-record.c            |  21 ++
>  tools/perf/util/Build                  |   1 +
>  tools/perf/util/bpf_off_cpu.c          | 301 +++++++++++++++++++++++++
>  tools/perf/util/bpf_skel/off_cpu.bpf.c | 214 ++++++++++++++++++
>  tools/perf/util/evsel.c                |   4 +-
>  6 files changed, 540 insertions(+), 2 deletions(-)
>  create mode 100644 tools/perf/util/bpf_off_cpu.c
>  create mode 100644 tools/perf/util/bpf_skel/off_cpu.bpf.c
> 
> 
> base-commit: 41204da4c16071be9090940b18f566832d46becc
> -- 
> 2.36.0.rc2.479.g8af0fa9b8e-goog
>