tools/testing/selftests/bpf/prog_tests/perf_buffer.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/prog_tests/perf_buffer.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/prog_tests/perf_buffer.c
Extension
.c
Size
3718 bytes
Lines
148
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

if (i >= on_len || !online[i]) {
			printf("skipping offline CPU #%d\n", i);
			continue;
		}

		if (trigger_on_cpu(i))
			goto out_close;
	}

	/* read perf buffer */
	err = perf_buffer__poll(pb, 100);
	if (CHECK(err < 0, "perf_buffer__poll", "err %d\n", err))
		goto out_free_pb;

	if (CHECK(CPU_COUNT(&cpu_seen) != nr_on_cpus, "seen_cpu_cnt",
		  "expect %d, seen %d\n", nr_on_cpus, CPU_COUNT(&cpu_seen)))
		goto out_free_pb;

	if (CHECK(perf_buffer__buffer_cnt(pb) != nr_on_cpus, "buf_cnt",
		  "got %zu, expected %d\n", perf_buffer__buffer_cnt(pb), nr_on_cpus))
		goto out_close;

	for (i = 0, j = 0; i < nr_cpus; i++) {
		if (i >= on_len || !online[i])
			continue;

		fd = perf_buffer__buffer_fd(pb, j);
		CHECK(fd < 0 || last_fd == fd, "fd_check", "last fd %d == fd %d\n", last_fd, fd);
		last_fd = fd;

		err = perf_buffer__consume_buffer(pb, j);
		if (CHECK(err, "drain_buf", "cpu %d, err %d\n", i, err))
			goto out_close;

		CPU_CLR(i, &cpu_seen);
		if (trigger_on_cpu(i))
			goto out_close;

		err = perf_buffer__consume_buffer(pb, j);
		if (CHECK(err, "consume_buf", "cpu %d, err %d\n", j, err))
			goto out_close;

		if (CHECK(!CPU_ISSET(i, &cpu_seen), "cpu_seen", "cpu %d not seen\n", i))
			goto out_close;
		j++;
	}

out_free_pb:
	perf_buffer__free(pb);
out_close:
	test_perf_buffer__destroy(skel);
	free(online);
}

Annotation

Implementation Notes