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| author | Alexei Starovoitov <ast@fb.com> | 2016-09-02 04:37:25 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-09-02 20:46:45 +0300 |
| commit | 1c47910ef80135ac89e4d0b471d123572cee5535 (patch) | |
| tree | 95066aef056b16a4e5e477c7f277cc69db418e5c /samples/bpf/bpf_load.c | |
| parent | aa6a5f3cb2b2edc5b9aab0b4fdfdfa9c3b5096a8 (diff) | |
| download | linux-1c47910ef80135ac89e4d0b471d123572cee5535.tar.xz | |
samples/bpf: add perf_event+bpf example
The bpf program is called 50 times a second and does hashmap[kern&user_stackid]++
It's primary purpose to check that key bpf helpers like map lookup, update,
get_stackid, trace_printk and ctx access are all working.
It checks:
- PERF_COUNT_HW_CPU_CYCLES on all cpus
- PERF_COUNT_HW_CPU_CYCLES for current process and inherited perf_events to children
- PERF_COUNT_SW_CPU_CLOCK on all cpus
- PERF_COUNT_SW_CPU_CLOCK for current process
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'samples/bpf/bpf_load.c')
| -rw-r--r-- | samples/bpf/bpf_load.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/samples/bpf/bpf_load.c b/samples/bpf/bpf_load.c index 0cfda2320320..97913e109b14 100644 --- a/samples/bpf/bpf_load.c +++ b/samples/bpf/bpf_load.c @@ -51,6 +51,7 @@ static int load_and_attach(const char *event, struct bpf_insn *prog, int size) bool is_kretprobe = strncmp(event, "kretprobe/", 10) == 0; bool is_tracepoint = strncmp(event, "tracepoint/", 11) == 0; bool is_xdp = strncmp(event, "xdp", 3) == 0; + bool is_perf_event = strncmp(event, "perf_event", 10) == 0; enum bpf_prog_type prog_type; char buf[256]; int fd, efd, err, id; @@ -69,6 +70,8 @@ static int load_and_attach(const char *event, struct bpf_insn *prog, int size) prog_type = BPF_PROG_TYPE_TRACEPOINT; } else if (is_xdp) { prog_type = BPF_PROG_TYPE_XDP; + } else if (is_perf_event) { + prog_type = BPF_PROG_TYPE_PERF_EVENT; } else { printf("Unknown event '%s'\n", event); return -1; @@ -82,7 +85,7 @@ static int load_and_attach(const char *event, struct bpf_insn *prog, int size) prog_fd[prog_cnt++] = fd; - if (is_xdp) + if (is_xdp || is_perf_event) return 0; if (is_socket) { @@ -326,6 +329,7 @@ int load_bpf_file(char *path) memcmp(shname_prog, "kretprobe/", 10) == 0 || memcmp(shname_prog, "tracepoint/", 11) == 0 || memcmp(shname_prog, "xdp", 3) == 0 || + memcmp(shname_prog, "perf_event", 10) == 0 || memcmp(shname_prog, "socket", 6) == 0) load_and_attach(shname_prog, insns, data_prog->d_size); } @@ -344,6 +348,7 @@ int load_bpf_file(char *path) memcmp(shname, "kretprobe/", 10) == 0 || memcmp(shname, "tracepoint/", 11) == 0 || memcmp(shname, "xdp", 3) == 0 || + memcmp(shname, "perf_event", 10) == 0 || memcmp(shname, "socket", 6) == 0) load_and_attach(shname, data->d_buf, data->d_size); } |