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| author | Daniel T. Lee <danieltimlee@gmail.com> | 2020-08-23 17:53:33 +0900 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2020-08-24 20:59:35 -0700 |
| commit | 3677d0a13171bb1dc8db0af84d48dea14a899962 (patch) | |
| tree | 3de96b317e44d7e1eb175a4be093101f317e88ff /samples/bpf/trace_output_kern.c | |
| parent | 35a8b6dd339f04cbcb0b2d085334263542a12b70 (diff) | |
| download | lwn-3677d0a13171bb1dc8db0af84d48dea14a899962.tar.gz lwn-3677d0a13171bb1dc8db0af84d48dea14a899962.zip | |
samples: bpf: Refactor kprobe tracing programs with libbpf
For the problem of increasing fragmentation of the bpf loader programs,
instead of using bpf_loader.o, which is used in samples/bpf, this
commit refactors the existing kprobe tracing programs with libbbpf
bpf loader.
- For kprobe events pointing to system calls, the SYSCALL() macro in
trace_common.h was used.
- Adding a kprobe event and attaching a bpf program to it was done
through bpf_program_attach().
- Instead of using the existing BPF MAP definition, MAP definition
has been refactored with the new BTF-defined MAP format.
Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200823085334.9413-3-danieltimlee@gmail.com
Diffstat (limited to 'samples/bpf/trace_output_kern.c')
| -rw-r--r-- | samples/bpf/trace_output_kern.c | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/samples/bpf/trace_output_kern.c b/samples/bpf/trace_output_kern.c index 1d7d422cae6f..b64815af0943 100644 --- a/samples/bpf/trace_output_kern.c +++ b/samples/bpf/trace_output_kern.c @@ -2,15 +2,16 @@ #include <linux/version.h> #include <uapi/linux/bpf.h> #include <bpf/bpf_helpers.h> +#include "trace_common.h" -struct bpf_map_def SEC("maps") my_map = { - .type = BPF_MAP_TYPE_PERF_EVENT_ARRAY, - .key_size = sizeof(int), - .value_size = sizeof(u32), - .max_entries = 2, -}; +struct { + __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); + __uint(key_size, sizeof(int)); + __uint(value_size, sizeof(u32)); + __uint(max_entries, 2); +} my_map SEC(".maps"); -SEC("kprobe/sys_write") +SEC("kprobe/" SYSCALL(sys_write)) int bpf_prog1(struct pt_regs *ctx) { struct S { |