diff options
| author |   Andrii Nakryiko <andriin@fb.com> | 2019-07-06 11:06:26 -0700 |
|---|---|---|
| committer |   Daniel Borkmann <daniel@iogearbox.net> | 2019-07-08 15:35:43 +0200 |
| commit | ee5cf82ce04a60d71b0dc219804f6cf1e6ba6d14 (patch) | |
| tree | 4deec4d2857b00221e53f75f9d64f62a7d95f672 /tools/testing/selftests/bpf/progs/test_perf_buffer.c | |
| parent | libbpf: auto-set PERF_EVENT_ARRAY size to number of CPUs (diff) | |
| download | linux-dev-ee5cf82ce04a60d71b0dc219804f6cf1e6ba6d14.tar.xz linux-dev-ee5cf82ce04a60d71b0dc219804f6cf1e6ba6d14.zip | |
selftests/bpf: test perf buffer API
Add test verifying perf buffer API functionality.
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to '')
| -rw-r--r-- | tools/testing/selftests/bpf/progs/test_perf_buffer.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/test_perf_buffer.c b/tools/testing/selftests/bpf/progs/test_perf_buffer.c new file mode 100644 index 000000000000..876c27deb65a --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_perf_buffer.c @@ -0,0 +1,25 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2019 Facebook + +#include <linux/ptrace.h> +#include <linux/bpf.h> +#include "bpf_helpers.h" + +struct { + __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); + __uint(key_size, sizeof(int)); + __uint(value_size, sizeof(int)); +} perf_buf_map SEC(".maps"); + +SEC("kprobe/sys_nanosleep") +int handle_sys_nanosleep_entry(struct pt_regs *ctx) +{ + int cpu = bpf_get_smp_processor_id(); + + bpf_perf_event_output(ctx, &perf_buf_map, BPF_F_CURRENT_CPU, + &cpu, sizeof(cpu)); + return 0; +} + +char _license[] SEC("license") = "GPL"; +__u32 _version SEC("version") = 1; |