tools/lib/perf/tests/test-evsel.c

Source file repositories/reference/linux-study-clean/tools/lib/perf/tests/test-evsel.c

File Facts

System
Linux kernel
Corpus path
tools/lib/perf/tests/test-evsel.c
Extension
.c
Size
9495 bytes
Lines
368
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

// SPDX-License-Identifier: GPL-2.0
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <linux/perf_event.h>
#include <linux/kernel.h>
#include <perf/cpumap.h>
#include <perf/threadmap.h>
#include <perf/evsel.h>
#include <internal/evsel.h>
#include <internal/tests.h>
#include "tests.h"

static int libperf_print(enum libperf_print_level level,
			 const char *fmt, va_list ap)
{
	return vfprintf(stderr, fmt, ap);
}

static int test_stat_cpu(void)
{
	struct perf_cpu_map *cpus;
	struct perf_evsel *evsel;
	struct perf_event_attr attr = {
		.type	= PERF_TYPE_SOFTWARE,
		.config	= PERF_COUNT_SW_CPU_CLOCK,
	};
	int err, idx;

	cpus = perf_cpu_map__new_online_cpus();
	__T("failed to create cpus", cpus);

	evsel = perf_evsel__new(&attr);
	__T("failed to create evsel", evsel);

	err = perf_evsel__open(evsel, cpus, NULL);
	__T("failed to open evsel", err == 0);

	for (idx = 0; idx < perf_cpu_map__nr(cpus); idx++) {
		struct perf_counts_values counts = { .val = 0 };

		perf_evsel__read(evsel, idx, 0, &counts);
		__T("failed to read value for evsel", counts.val != 0);
	}

	perf_evsel__close(evsel);
	perf_evsel__delete(evsel);

	perf_cpu_map__put(cpus);
	return 0;
}

static int test_stat_thread(void)
{
	struct perf_counts_values counts = { .val = 0 };
	struct perf_thread_map *threads;
	struct perf_evsel *evsel;
	struct perf_event_attr attr = {
		.type	= PERF_TYPE_SOFTWARE,
		.config	= PERF_COUNT_SW_TASK_CLOCK,
	};
	int err;

	threads = perf_thread_map__new_dummy();
	__T("failed to create threads", threads);

	perf_thread_map__set_pid(threads, 0, 0);

	evsel = perf_evsel__new(&attr);
	__T("failed to create evsel", evsel);

	err = perf_evsel__open(evsel, NULL, threads);
	__T("failed to open evsel", err == 0);

	perf_evsel__read(evsel, 0, 0, &counts);
	__T("failed to read value for evsel", counts.val != 0);

	perf_evsel__close(evsel);
	perf_evsel__delete(evsel);

	perf_thread_map__put(threads);
	return 0;
}

static int test_stat_thread_enable(void)
{
	struct perf_counts_values counts = { .val = 0 };
	struct perf_thread_map *threads;
	struct perf_evsel *evsel;
	struct perf_event_attr attr = {

Annotation

Implementation Notes