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samples/bpf: raw tracepoint test

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add empty raw_tracepoint bpf program to test overhead similar
to kprobe and traditional tracepoint tests

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Alexei Starovoitov 2018-03-28 12:05:39 -07:00 committed by Daniel Borkmann
parent a0fe3e574b
commit 4662a4e538
4 changed files with 44 additions and 0 deletions
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1
samples/bpf/Makefile
View file

@ -119,6 +119,7 @@ always += offwaketime_kern.o
always += spintest_kern.o
always += map_perf_test_kern.o
always += test_overhead_tp_kern.o
always += test_overhead_raw_tp_kern.o
always += test_overhead_kprobe_kern.o
always += parse_varlen.o parse_simple.o parse_ldabs.o
always += test_cgrp2_tc_kern.o

14
samples/bpf/bpf_load.c
View file

@ -61,6 +61,7 @@ static int load_and_attach(const char *event, struct bpf_insn *prog, int size)
bool is_kprobe = strncmp(event, "kprobe/", 7) == 0;
bool is_kretprobe = strncmp(event, "kretprobe/", 10) == 0;
bool is_tracepoint = strncmp(event, "tracepoint/", 11) == 0;
bool is_raw_tracepoint = strncmp(event, "raw_tracepoint/", 15) == 0;
bool is_xdp = strncmp(event, "xdp", 3) == 0;
bool is_perf_event = strncmp(event, "perf_event", 10) == 0;
bool is_cgroup_skb = strncmp(event, "cgroup/skb", 10) == 0;
@ -85,6 +86,8 @@ static int load_and_attach(const char *event, struct bpf_insn *prog, int size)
prog_type = BPF_PROG_TYPE_KPROBE;
} else if (is_tracepoint) {
prog_type = BPF_PROG_TYPE_TRACEPOINT;
} else if (is_raw_tracepoint) {
prog_type = BPF_PROG_TYPE_RAW_TRACEPOINT;
} else if (is_xdp) {
prog_type = BPF_PROG_TYPE_XDP;
} else if (is_perf_event) {
@ -131,6 +134,16 @@ static int load_and_attach(const char *event, struct bpf_insn *prog, int size)
return populate_prog_array(event, fd);
}
if (is_raw_tracepoint) {
efd = bpf_raw_tracepoint_open(event + 15, fd);
if (efd < 0) {
printf("tracepoint %s %s\n", event + 15, strerror(errno));
return -1;
}
event_fd[prog_cnt - 1] = efd;
return 0;
}
if (is_kprobe || is_kretprobe) {
if (is_kprobe)
event += 7;
@ -587,6 +600,7 @@ static int do_load_bpf_file(const char *path, fixup_map_cb fixup_map)
if (memcmp(shname, "kprobe/", 7) == 0 ||
memcmp(shname, "kretprobe/", 10) == 0 ||
memcmp(shname, "tracepoint/", 11) == 0 ||
memcmp(shname, "raw_tracepoint/", 15) == 0 ||
memcmp(shname, "xdp", 3) == 0 ||
memcmp(shname, "perf_event", 10) == 0 ||
memcmp(shname, "socket", 6) == 0 ||

17
samples/bpf/test_overhead_raw_tp_kern.c Normal file
View file

@ -0,0 +1,17 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2018 Facebook */
#include <uapi/linux/bpf.h>
#include "bpf_helpers.h"
SEC("raw_tracepoint/task_rename")
int prog(struct bpf_raw_tracepoint_args *ctx)
{
return 0;
}
SEC("raw_tracepoint/urandom_read")
int prog2(struct bpf_raw_tracepoint_args *ctx)
{
return 0;
}
char _license[] SEC("license") = "GPL";

12
samples/bpf/test_overhead_user.c
View file

@ -158,5 +158,17 @@ int main(int argc, char **argv)
unload_progs();
}
if (test_flags & 0xC0) {
snprintf(filename, sizeof(filename),
"%s_raw_tp_kern.o", argv[0]);
if (load_bpf_file(filename)) {
printf("%s", bpf_log_buf);
return 1;
}
printf("w/RAW_TRACEPOINT\n");
run_perf_test(num_cpu, test_flags >> 6);
unload_progs();
}
return 0;
}