netdev - [PATCH v8 bpf-next 0/3] bpf: sharing bpf runtime stats with

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Date:   Tue, 28 Apr 2020 23:45:40 -0700
From:   Song Liu <songliubraving@...com>
To:     <bpf@...r.kernel.org>, <netdev@...r.kernel.org>
CC:     <ast@...nel.org>, <daniel@...earbox.net>, <kernel-team@...com>,
        Song Liu <songliubraving@...com>
Subject: [PATCH v8 bpf-next 0/3] bpf: sharing bpf runtime stats with

run_time_ns is a useful stats for BPF programs. However, it is gated by
sysctl kernel.bpf_stats_enabled. When multiple user space tools are
toggling kernl.bpf_stats_enabled at the same time, they may confuse each
other.

Solve this problem with a new BPF command BPF_ENABLE_STATS.

Changes v7 => v8:
  1. Change name BPF_STATS_RUNTIME_CNT => BPF_STATS_RUN_TIME (Alexei).
  2. Add CHECK_ATTR to bpf_enable_stats() (Alexei).
  3. Rebase (Andrii).
  4. Simplfy the selftest (Alexei).

Changes v6 => v7:
  1. Add test to verify run_cnt matches count measured by the program.

Changes v5 => v6:
  1. Simplify test program (Yonghong).
  2. Rebase (with some conflicts).

Changes v4 => v5:
  1. Use memset to zero bpf_attr in bpf_enable_stats() (Andrii).

Changes v3 => v4:
  1. Add libbpf support and selftest;
  2. Avoid cleaning trailing space.

Changes v2 => v3:
  1. Rename the command to BPF_ENABLE_STATS, and make it extendible.
  2. fix commit log;
  3. remove unnecessary headers.

Song Liu (3):
  bpf: sharing bpf runtime stats with BPF_ENABLE_STATS
  libbpf: add support for command BPF_ENABLE_STATS
  bpf: add selftest for BPF_ENABLE_STATS

 include/linux/bpf.h                           |  1 +
 include/uapi/linux/bpf.h                      | 11 ++++
 kernel/bpf/syscall.c                          | 57 +++++++++++++++++++
 kernel/sysctl.c                               | 36 +++++++++++-
 tools/include/uapi/linux/bpf.h                | 11 ++++
 tools/lib/bpf/bpf.c                           | 10 ++++
 tools/lib/bpf/bpf.h                           |  1 +
 tools/lib/bpf/libbpf.map                      |  1 +
 .../selftests/bpf/prog_tests/enable_stats.c   | 46 +++++++++++++++
 .../selftests/bpf/progs/test_enable_stats.c   | 18 ++++++
 10 files changed, 191 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/enable_stats.c
 create mode 100644 tools/testing/selftests/bpf/progs/test_enable_stats.c

--
2.24.1