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 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. Changes RFC => v2: 1. Add a new bpf command instead of /dev/bpf_stats; 2. Remove the jump_label patch, which is no longer needed; 3. Add a static variable to save previous value of the sysctl. 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 | 50 +++++++++++++++++++ kernel/sysctl.c | 36 ++++++++++++- tools/include/uapi/linux/bpf.h | 11 ++++ tools/lib/bpf/bpf.c | 9 ++++ tools/lib/bpf/bpf.h | 1 + tools/lib/bpf/libbpf.map | 5 ++ .../selftests/bpf/prog_tests/enable_stats.c | 45 +++++++++++++++++ .../selftests/bpf/progs/test_enable_stats.c | 28 +++++++++++ 10 files changed, 196 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
