tools/perf/bench/pmu-scan.c

Source file repositories/reference/linux-study-clean/tools/perf/bench/pmu-scan.c

File Facts

System
Linux kernel
Corpus path
tools/perf/bench/pmu-scan.c
Extension
.c
Size
3951 bytes
Lines
188
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

struct pmu_scan_result {
	char *name;
	int nr_aliases;
	int nr_formats;
	int nr_caps;
	bool is_core;
};

static const struct option options[] = {
	OPT_UINTEGER('i', "iterations", &iterations,
		"Number of iterations used to compute average"),
	OPT_END()
};

static const char *const bench_usage[] = {
	"perf bench internals pmu-scan <options>",
	NULL
};

static int nr_pmus;
static struct pmu_scan_result *results;

static int save_result(void)
{
	struct perf_pmu *pmu = NULL;
	struct list_head *list;
	struct pmu_scan_result *r;

	while ((pmu = perf_pmus__scan(pmu)) != NULL) {
		r = realloc(results, (nr_pmus + 1) * sizeof(*r));
		if (r == NULL)
			return -ENOMEM;

		results = r;
		r = results + nr_pmus;

		r->name = strdup(pmu->name);
		r->is_core = pmu->is_core;
		r->nr_caps = pmu->nr_caps;

		r->nr_aliases = perf_pmu__num_events(pmu);

		r->nr_formats = 0;
		list_for_each(list, &pmu->format)
			r->nr_formats++;

		pr_debug("pmu[%d] name=%s, nr_caps=%d, nr_aliases=%d, nr_formats=%d\n",
			nr_pmus, r->name, r->nr_caps, r->nr_aliases, r->nr_formats);
		nr_pmus++;
	}

	perf_pmus__destroy();
	return 0;
}

static int check_result(bool core_only)
{
	struct pmu_scan_result *r;
	struct perf_pmu *pmu;
	struct list_head *list;
	int nr;

	for (int i = 0; i < nr_pmus; i++) {
		r = &results[i];
		if (core_only && !r->is_core)
			continue;

		pmu = perf_pmus__find(r->name);
		if (pmu == NULL) {
			pr_err("Cannot find PMU %s\n", r->name);
			return -1;
		}

		if (pmu->nr_caps != (u32)r->nr_caps) {
			pr_err("Unmatched number of event caps in %s: expect %d vs got %d\n",
				pmu->name, r->nr_caps, pmu->nr_caps);
			return -1;
		}

		nr = perf_pmu__num_events(pmu);
		if (nr != r->nr_aliases) {
			pr_err("Unmatched number of event aliases in %s: expect %d vs got %d\n",
				pmu->name, r->nr_aliases, nr);
			return -1;
		}

		nr = 0;
		list_for_each(list, &pmu->format)
			nr++;
		if (nr != r->nr_formats) {

Annotation

Implementation Notes