149 lines
3.8 KiB
C
149 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (c) 2019 Facebook */
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#define _GNU_SOURCE
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#include <sched.h>
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#include <sys/prctl.h>
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#include <test_progs.h>
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#define MAX_CNT 100000
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static __u64 time_get_ns(void)
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{
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struct timespec ts;
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clock_gettime(CLOCK_MONOTONIC, &ts);
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return ts.tv_sec * 1000000000ull + ts.tv_nsec;
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}
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static int test_task_rename(const char *prog)
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{
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int i, fd, duration = 0, err;
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char buf[] = "test_overhead";
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__u64 start_time;
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fd = open("/proc/self/comm", O_WRONLY|O_TRUNC);
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if (CHECK(fd < 0, "open /proc", "err %d", errno))
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return -1;
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start_time = time_get_ns();
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for (i = 0; i < MAX_CNT; i++) {
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err = write(fd, buf, sizeof(buf));
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if (err < 0) {
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CHECK(err < 0, "task rename", "err %d", errno);
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close(fd);
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return -1;
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}
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}
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printf("task_rename %s\t%lluK events per sec\n", prog,
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MAX_CNT * 1000000ll / (time_get_ns() - start_time));
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close(fd);
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return 0;
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}
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static void test_run(const char *prog)
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{
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test_task_rename(prog);
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}
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static void setaffinity(void)
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{
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cpu_set_t cpuset;
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int cpu = 0;
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CPU_ZERO(&cpuset);
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CPU_SET(cpu, &cpuset);
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sched_setaffinity(0, sizeof(cpuset), &cpuset);
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}
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void test_test_overhead(void)
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{
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const char *kprobe_name = "prog1";
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const char *kretprobe_name = "prog2";
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const char *raw_tp_name = "prog3";
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const char *fentry_name = "prog4";
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const char *fexit_name = "prog5";
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const char *kprobe_func = "__set_task_comm";
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struct bpf_program *kprobe_prog, *kretprobe_prog, *raw_tp_prog;
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struct bpf_program *fentry_prog, *fexit_prog;
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struct bpf_object *obj;
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struct bpf_link *link;
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int err, duration = 0;
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char comm[16] = {};
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if (CHECK_FAIL(prctl(PR_GET_NAME, comm, 0L, 0L, 0L)))
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return;
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obj = bpf_object__open_file("./test_overhead.bpf.o", NULL);
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if (!ASSERT_OK_PTR(obj, "obj_open_file"))
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return;
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kprobe_prog = bpf_object__find_program_by_name(obj, kprobe_name);
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if (CHECK(!kprobe_prog, "find_probe",
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"prog '%s' not found\n", kprobe_name))
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goto cleanup;
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kretprobe_prog = bpf_object__find_program_by_name(obj, kretprobe_name);
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if (CHECK(!kretprobe_prog, "find_probe",
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"prog '%s' not found\n", kretprobe_name))
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goto cleanup;
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raw_tp_prog = bpf_object__find_program_by_name(obj, raw_tp_name);
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if (CHECK(!raw_tp_prog, "find_probe",
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"prog '%s' not found\n", raw_tp_name))
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goto cleanup;
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fentry_prog = bpf_object__find_program_by_name(obj, fentry_name);
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if (CHECK(!fentry_prog, "find_probe",
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"prog '%s' not found\n", fentry_name))
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goto cleanup;
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fexit_prog = bpf_object__find_program_by_name(obj, fexit_name);
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if (CHECK(!fexit_prog, "find_probe",
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"prog '%s' not found\n", fexit_name))
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goto cleanup;
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err = bpf_object__load(obj);
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if (CHECK(err, "obj_load", "err %d\n", err))
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goto cleanup;
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setaffinity();
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/* base line run */
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test_run("base");
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/* attach kprobe */
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link = bpf_program__attach_kprobe(kprobe_prog, false /* retprobe */,
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kprobe_func);
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if (!ASSERT_OK_PTR(link, "attach_kprobe"))
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goto cleanup;
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test_run("kprobe");
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bpf_link__destroy(link);
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/* attach kretprobe */
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link = bpf_program__attach_kprobe(kretprobe_prog, true /* retprobe */,
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kprobe_func);
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if (!ASSERT_OK_PTR(link, "attach_kretprobe"))
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goto cleanup;
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test_run("kretprobe");
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bpf_link__destroy(link);
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/* attach raw_tp */
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link = bpf_program__attach_raw_tracepoint(raw_tp_prog, "task_rename");
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if (!ASSERT_OK_PTR(link, "attach_raw_tp"))
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goto cleanup;
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test_run("raw_tp");
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bpf_link__destroy(link);
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/* attach fentry */
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link = bpf_program__attach_trace(fentry_prog);
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if (!ASSERT_OK_PTR(link, "attach_fentry"))
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goto cleanup;
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test_run("fentry");
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bpf_link__destroy(link);
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/* attach fexit */
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link = bpf_program__attach_trace(fexit_prog);
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if (!ASSERT_OK_PTR(link, "attach_fexit"))
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goto cleanup;
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test_run("fexit");
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bpf_link__destroy(link);
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cleanup:
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prctl(PR_SET_NAME, comm, 0L, 0L, 0L);
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bpf_object__close(obj);
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}
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