Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 801 insertions, 0 deletions

diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c
new file mode 100644
index 000000000..ec3506042
--- /dev/null
+++ b/tools/perf/util/stat.c
@@ -0,0 +1,801 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <errno.h>
+#include <linux/err.h>
+#include <inttypes.h>
+#include <math.h>
+#include <string.h>
+#include "counts.h"
+#include "cpumap.h"
+#include "debug.h"
+#include "header.h"
+#include "stat.h"
+#include "session.h"
+#include "target.h"
+#include "evlist.h"
+#include "evsel.h"
+#include "thread_map.h"
+#include "util/hashmap.h"
+#include <linux/zalloc.h>
+
+void update_stats(struct stats *stats, u64 val)
+{
+	double delta;
+
+	stats->n++;
+	delta = val - stats->mean;
+	stats->mean += delta / stats->n;
+	stats->M2 += delta*(val - stats->mean);
+
+	if (val > stats->max)
+		stats->max = val;
+
+	if (val < stats->min)
+		stats->min = val;
+}
+
+double avg_stats(struct stats *stats)
+{
+	return stats->mean;
+}
+
+/*
+ * http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance
+ *
+ *       (\Sum n_i^2) - ((\Sum n_i)^2)/n
+ * s^2 = -------------------------------
+ *                  n - 1
+ *
+ * http://en.wikipedia.org/wiki/Stddev
+ *
+ * The std dev of the mean is related to the std dev by:
+ *
+ *             s
+ * s_mean = -------
+ *          sqrt(n)
+ *
+ */
+double stddev_stats(struct stats *stats)
+{
+	double variance, variance_mean;
+
+	if (stats->n < 2)
+		return 0.0;
+
+	variance = stats->M2 / (stats->n - 1);
+	variance_mean = variance / stats->n;
+
+	return sqrt(variance_mean);
+}
+
+double rel_stddev_stats(double stddev, double avg)
+{
+	double pct = 0.0;
+
+	if (avg)
+		pct = 100.0 * stddev/avg;
+
+	return pct;
+}
+
+static void evsel__reset_aggr_stats(struct evsel *evsel)
+{
+	struct perf_stat_evsel *ps = evsel->stats;
+	struct perf_stat_aggr *aggr = ps->aggr;
+
+	if (aggr)
+		memset(aggr, 0, sizeof(*aggr) * ps->nr_aggr);
+}
+
+static void evsel__reset_stat_priv(struct evsel *evsel)
+{
+	struct perf_stat_evsel *ps = evsel->stats;
+
+	init_stats(&ps->res_stats);
+	evsel__reset_aggr_stats(evsel);
+}
+
+static int evsel__alloc_aggr_stats(struct evsel *evsel, int nr_aggr)
+{
+	struct perf_stat_evsel *ps = evsel->stats;
+
+	if (ps == NULL)
+		return 0;
+
+	ps->nr_aggr = nr_aggr;
+	ps->aggr = calloc(nr_aggr, sizeof(*ps->aggr));
+	if (ps->aggr == NULL)
+		return -ENOMEM;
+
+	return 0;
+}
+
+int evlist__alloc_aggr_stats(struct evlist *evlist, int nr_aggr)
+{
+	struct evsel *evsel;
+
+	evlist__for_each_entry(evlist, evsel) {
+		if (evsel__alloc_aggr_stats(evsel, nr_aggr) < 0)
+			return -1;
+	}
+	return 0;
+}
+
+static int evsel__alloc_stat_priv(struct evsel *evsel, int nr_aggr)
+{
+	struct perf_stat_evsel *ps;
+
+	ps = zalloc(sizeof(*ps));
+	if (ps == NULL)
+		return -ENOMEM;
+
+	evsel->stats = ps;
+
+	if (nr_aggr && evsel__alloc_aggr_stats(evsel, nr_aggr) < 0) {
+		evsel->stats = NULL;
+		free(ps);
+		return -ENOMEM;
+	}
+
+	evsel__reset_stat_priv(evsel);
+	return 0;
+}
+
+static void evsel__free_stat_priv(struct evsel *evsel)
+{
+	struct perf_stat_evsel *ps = evsel->stats;
+
+	if (ps) {
+		zfree(&ps->aggr);
+		zfree(&ps->group_data);
+	}
+	zfree(&evsel->stats);
+}
+
+static int evsel__alloc_prev_raw_counts(struct evsel *evsel)
+{
+	int cpu_map_nr = evsel__nr_cpus(evsel);
+	int nthreads = perf_thread_map__nr(evsel->core.threads);
+	struct perf_counts *counts;
+
+	counts = perf_counts__new(cpu_map_nr, nthreads);
+	if (counts)
+		evsel->prev_raw_counts = counts;
+
+	return counts ? 0 : -ENOMEM;
+}
+
+static void evsel__free_prev_raw_counts(struct evsel *evsel)
+{
+	perf_counts__delete(evsel->prev_raw_counts);
+	evsel->prev_raw_counts = NULL;
+}
+
+static void evsel__reset_prev_raw_counts(struct evsel *evsel)
+{
+	if (evsel->prev_raw_counts)
+		perf_counts__reset(evsel->prev_raw_counts);
+}
+
+static int evsel__alloc_stats(struct evsel *evsel, int nr_aggr, bool alloc_raw)
+{
+	if (evsel__alloc_stat_priv(evsel, nr_aggr) < 0 ||
+	    evsel__alloc_counts(evsel) < 0 ||
+	    (alloc_raw && evsel__alloc_prev_raw_counts(evsel) < 0))
+		return -ENOMEM;
+
+	return 0;
+}
+
+int evlist__alloc_stats(struct perf_stat_config *config,
+			struct evlist *evlist, bool alloc_raw)
+{
+	struct evsel *evsel;
+	int nr_aggr = 0;
+
+	if (config && config->aggr_map)
+		nr_aggr = config->aggr_map->nr;
+
+	evlist__for_each_entry(evlist, evsel) {
+		if (evsel__alloc_stats(evsel, nr_aggr, alloc_raw))
+			goto out_free;
+	}
+
+	return 0;
+
+out_free:
+	evlist__free_stats(evlist);
+	return -1;
+}
+
+void evlist__free_stats(struct evlist *evlist)
+{
+	struct evsel *evsel;
+
+	evlist__for_each_entry(evlist, evsel) {
+		evsel__free_stat_priv(evsel);
+		evsel__free_counts(evsel);
+		evsel__free_prev_raw_counts(evsel);
+	}
+}
+
+void evlist__reset_stats(struct evlist *evlist)
+{
+	struct evsel *evsel;
+
+	evlist__for_each_entry(evlist, evsel) {
+		evsel__reset_stat_priv(evsel);
+		evsel__reset_counts(evsel);
+	}
+}
+
+void evlist__reset_aggr_stats(struct evlist *evlist)
+{
+	struct evsel *evsel;
+
+	evlist__for_each_entry(evlist, evsel)
+		evsel__reset_aggr_stats(evsel);
+}
+
+void evlist__reset_prev_raw_counts(struct evlist *evlist)
+{
+	struct evsel *evsel;
+
+	evlist__for_each_entry(evlist, evsel)
+		evsel__reset_prev_raw_counts(evsel);
+}
+
+static void evsel__copy_prev_raw_counts(struct evsel *evsel)
+{
+	int idx, nthreads = perf_thread_map__nr(evsel->core.threads);
+
+	for (int thread = 0; thread < nthreads; thread++) {
+		perf_cpu_map__for_each_idx(idx, evsel__cpus(evsel)) {
+			*perf_counts(evsel->counts, idx, thread) =
+				*perf_counts(evsel->prev_raw_counts, idx, thread);
+		}
+	}
+}
+
+void evlist__copy_prev_raw_counts(struct evlist *evlist)
+{
+	struct evsel *evsel;
+
+	evlist__for_each_entry(evlist, evsel)
+		evsel__copy_prev_raw_counts(evsel);
+}
+
+static void evsel__copy_res_stats(struct evsel *evsel)
+{
+	struct perf_stat_evsel *ps = evsel->stats;
+
+	/*
+	 * For GLOBAL aggregation mode, it updates the counts for each run
+	 * in the evsel->stats.res_stats.  See perf_stat_process_counter().
+	 */
+	*ps->aggr[0].counts.values = avg_stats(&ps->res_stats);
+}
+
+void evlist__copy_res_stats(struct perf_stat_config *config, struct evlist *evlist)
+{
+	struct evsel *evsel;
+
+	if (config->aggr_mode != AGGR_GLOBAL)
+		return;
+
+	evlist__for_each_entry(evlist, evsel)
+		evsel__copy_res_stats(evsel);
+}
+
+static size_t pkg_id_hash(long __key, void *ctx __maybe_unused)
+{
+	uint64_t *key = (uint64_t *) __key;
+
+	return *key & 0xffffffff;
+}
+
+static bool pkg_id_equal(long __key1, long __key2, void *ctx __maybe_unused)
+{
+	uint64_t *key1 = (uint64_t *) __key1;
+	uint64_t *key2 = (uint64_t *) __key2;
+
+	return *key1 == *key2;
+}
+
+static int check_per_pkg(struct evsel *counter, struct perf_counts_values *vals,
+			 int cpu_map_idx, bool *skip)
+{
+	struct hashmap *mask = counter->per_pkg_mask;
+	struct perf_cpu_map *cpus = evsel__cpus(counter);
+	struct perf_cpu cpu = perf_cpu_map__cpu(cpus, cpu_map_idx);
+	int s, d, ret = 0;
+	uint64_t *key;
+
+	*skip = false;
+
+	if (!counter->per_pkg)
+		return 0;
+
+	if (perf_cpu_map__empty(cpus))
+		return 0;
+
+	if (!mask) {
+		mask = hashmap__new(pkg_id_hash, pkg_id_equal, NULL);
+		if (IS_ERR(mask))
+			return -ENOMEM;
+
+		counter->per_pkg_mask = mask;
+	}
+
+	/*
+	 * we do not consider an event that has not run as a good
+	 * instance to mark a package as used (skip=1). Otherwise
+	 * we may run into a situation where the first CPU in a package
+	 * is not running anything, yet the second is, and this function
+	 * would mark the package as used after the first CPU and would
+	 * not read the values from the second CPU.
+	 */
+	if (!(vals->run && vals->ena))
+		return 0;
+
+	s = cpu__get_socket_id(cpu);
+	if (s < 0)
+		return -1;
+
+	/*
+	 * On multi-die system, die_id > 0. On no-die system, die_id = 0.
+	 * We use hashmap(socket, die) to check the used socket+die pair.
+	 */
+	d = cpu__get_die_id(cpu);
+	if (d < 0)
+		return -1;
+
+	key = malloc(sizeof(*key));
+	if (!key)
+		return -ENOMEM;
+
+	*key = (uint64_t)d << 32 | s;
+	if (hashmap__find(mask, key, NULL)) {
+		*skip = true;
+		free(key);
+	} else
+		ret = hashmap__add(mask, key, 1);
+
+	return ret;
+}
+
+static bool evsel__count_has_error(struct evsel *evsel,
+				   struct perf_counts_values *count,
+				   struct perf_stat_config *config)
+{
+	/* the evsel was failed already */
+	if (evsel->err || evsel->counts->scaled == -1)
+		return true;
+
+	/* this is meaningful for CPU aggregation modes only */
+	if (config->aggr_mode == AGGR_GLOBAL)
+		return false;
+
+	/* it's considered ok when it actually ran */
+	if (count->ena != 0 && count->run != 0)
+		return false;
+
+	return true;
+}
+
+static int
+process_counter_values(struct perf_stat_config *config, struct evsel *evsel,
+		       int cpu_map_idx, int thread,
+		       struct perf_counts_values *count)
+{
+	struct perf_stat_evsel *ps = evsel->stats;
+	static struct perf_counts_values zero;
+	bool skip = false;
+
+	if (check_per_pkg(evsel, count, cpu_map_idx, &skip)) {
+		pr_err("failed to read per-pkg counter\n");
+		return -1;
+	}
+
+	if (skip)
+		count = &zero;
+
+	if (!evsel->snapshot)
+		evsel__compute_deltas(evsel, cpu_map_idx, thread, count);
+	perf_counts_values__scale(count, config->scale, NULL);
+
+	if (config->aggr_mode == AGGR_THREAD) {
+		struct perf_counts_values *aggr_counts = &ps->aggr[thread].counts;
+
+		/*
+		 * Skip value 0 when enabling --per-thread globally,
+		 * otherwise too many 0 output.
+		 */
+		if (count->val == 0 && config->system_wide)
+			return 0;
+
+		ps->aggr[thread].nr++;
+
+		aggr_counts->val += count->val;
+		aggr_counts->ena += count->ena;
+		aggr_counts->run += count->run;
+		return 0;
+	}
+
+	if (ps->aggr) {
+		struct perf_cpu cpu = perf_cpu_map__cpu(evsel->core.cpus, cpu_map_idx);
+		struct aggr_cpu_id aggr_id = config->aggr_get_id(config, cpu);
+		struct perf_stat_aggr *ps_aggr;
+		int i;
+
+		for (i = 0; i < ps->nr_aggr; i++) {
+			if (!aggr_cpu_id__equal(&aggr_id, &config->aggr_map->map[i]))
+				continue;
+
+			ps_aggr = &ps->aggr[i];
+			ps_aggr->nr++;
+
+			/*
+			 * When any result is bad, make them all to give consistent output
+			 * in interval mode.  But per-task counters can have 0 enabled time
+			 * when some tasks are idle.
+			 */
+			if (evsel__count_has_error(evsel, count, config) && !ps_aggr->failed) {
+				ps_aggr->counts.val = 0;
+				ps_aggr->counts.ena = 0;
+				ps_aggr->counts.run = 0;
+				ps_aggr->failed = true;
+			}
+
+			if (!ps_aggr->failed) {
+				ps_aggr->counts.val += count->val;
+				ps_aggr->counts.ena += count->ena;
+				ps_aggr->counts.run += count->run;
+			}
+			break;
+		}
+	}
+
+	return 0;
+}
+
+static int process_counter_maps(struct perf_stat_config *config,
+				struct evsel *counter)
+{
+	int nthreads = perf_thread_map__nr(counter->core.threads);
+	int ncpus = evsel__nr_cpus(counter);
+	int idx, thread;
+
+	for (thread = 0; thread < nthreads; thread++) {
+		for (idx = 0; idx < ncpus; idx++) {
+			if (process_counter_values(config, counter, idx, thread,
+						   perf_counts(counter->counts, idx, thread)))
+				return -1;
+		}
+	}
+
+	return 0;
+}
+
+int perf_stat_process_counter(struct perf_stat_config *config,
+			      struct evsel *counter)
+{
+	struct perf_stat_evsel *ps = counter->stats;
+	u64 *count;
+	int ret;
+
+	if (counter->per_pkg)
+		evsel__zero_per_pkg(counter);
+
+	ret = process_counter_maps(config, counter);
+	if (ret)
+		return ret;
+
+	if (config->aggr_mode != AGGR_GLOBAL)
+		return 0;
+
+	/*
+	 * GLOBAL aggregation mode only has a single aggr counts,
+	 * so we can use ps->aggr[0] as the actual output.
+	 */
+	count = ps->aggr[0].counts.values;
+	update_stats(&ps->res_stats, *count);
+
+	if (verbose > 0) {
+		fprintf(config->output, "%s: %" PRIu64 " %" PRIu64 " %" PRIu64 "\n",
+			evsel__name(counter), count[0], count[1], count[2]);
+	}
+
+	return 0;
+}
+
+static int evsel__merge_aggr_counters(struct evsel *evsel, struct evsel *alias)
+{
+	struct perf_stat_evsel *ps_a = evsel->stats;
+	struct perf_stat_evsel *ps_b = alias->stats;
+	int i;
+
+	if (ps_a->aggr == NULL && ps_b->aggr == NULL)
+		return 0;
+
+	if (ps_a->nr_aggr != ps_b->nr_aggr) {
+		pr_err("Unmatched aggregation mode between aliases\n");
+		return -1;
+	}
+
+	for (i = 0; i < ps_a->nr_aggr; i++) {
+		struct perf_counts_values *aggr_counts_a = &ps_a->aggr[i].counts;
+		struct perf_counts_values *aggr_counts_b = &ps_b->aggr[i].counts;
+
+		/* NB: don't increase aggr.nr for aliases */
+
+		aggr_counts_a->val += aggr_counts_b->val;
+		aggr_counts_a->ena += aggr_counts_b->ena;
+		aggr_counts_a->run += aggr_counts_b->run;
+	}
+
+	return 0;
+}
+/* events should have the same name, scale, unit, cgroup but on different PMUs */
+static bool evsel__is_alias(struct evsel *evsel_a, struct evsel *evsel_b)
+{
+	if (strcmp(evsel__name(evsel_a), evsel__name(evsel_b)))
+		return false;
+
+	if (evsel_a->scale != evsel_b->scale)
+		return false;
+
+	if (evsel_a->cgrp != evsel_b->cgrp)
+		return false;
+
+	if (strcmp(evsel_a->unit, evsel_b->unit))
+		return false;
+
+	if (evsel__is_clock(evsel_a) != evsel__is_clock(evsel_b))
+		return false;
+
+	return !!strcmp(evsel_a->pmu_name, evsel_b->pmu_name);
+}
+
+static void evsel__merge_aliases(struct evsel *evsel)
+{
+	struct evlist *evlist = evsel->evlist;
+	struct evsel *alias;
+
+	alias = list_prepare_entry(evsel, &(evlist->core.entries), core.node);
+	list_for_each_entry_continue(alias, &evlist->core.entries, core.node) {
+		/* Merge the same events on different PMUs. */
+		if (evsel__is_alias(evsel, alias)) {
+			evsel__merge_aggr_counters(evsel, alias);
+			alias->merged_stat = true;
+		}
+	}
+}
+
+static bool evsel__should_merge_hybrid(const struct evsel *evsel,
+				       const struct perf_stat_config *config)
+{
+	return config->hybrid_merge && evsel__is_hybrid(evsel);
+}
+
+static void evsel__merge_stats(struct evsel *evsel, struct perf_stat_config *config)
+{
+	/* this evsel is already merged */
+	if (evsel->merged_stat)
+		return;
+
+	if (evsel->auto_merge_stats || evsel__should_merge_hybrid(evsel, config))
+		evsel__merge_aliases(evsel);
+}
+
+/* merge the same uncore and hybrid events if requested */
+void perf_stat_merge_counters(struct perf_stat_config *config, struct evlist *evlist)
+{
+	struct evsel *evsel;
+
+	if (config->no_merge)
+		return;
+
+	evlist__for_each_entry(evlist, evsel)
+		evsel__merge_stats(evsel, config);
+}
+
+static void evsel__update_percore_stats(struct evsel *evsel, struct aggr_cpu_id *core_id)
+{
+	struct perf_stat_evsel *ps = evsel->stats;
+	struct perf_counts_values counts = { 0, };
+	struct aggr_cpu_id id;
+	struct perf_cpu cpu;
+	int idx;
+
+	/* collect per-core counts */
+	perf_cpu_map__for_each_cpu(cpu, idx, evsel->core.cpus) {
+		struct perf_stat_aggr *aggr = &ps->aggr[idx];
+
+		id = aggr_cpu_id__core(cpu, NULL);
+		if (!aggr_cpu_id__equal(core_id, &id))
+			continue;
+
+		counts.val += aggr->counts.val;
+		counts.ena += aggr->counts.ena;
+		counts.run += aggr->counts.run;
+	}
+
+	/* update aggregated per-core counts for each CPU */
+	perf_cpu_map__for_each_cpu(cpu, idx, evsel->core.cpus) {
+		struct perf_stat_aggr *aggr = &ps->aggr[idx];
+
+		id = aggr_cpu_id__core(cpu, NULL);
+		if (!aggr_cpu_id__equal(core_id, &id))
+			continue;
+
+		aggr->counts.val = counts.val;
+		aggr->counts.ena = counts.ena;
+		aggr->counts.run = counts.run;
+
+		aggr->used = true;
+	}
+}
+
+/* we have an aggr_map for cpu, but want to aggregate the counters per-core */
+static void evsel__process_percore(struct evsel *evsel)
+{
+	struct perf_stat_evsel *ps = evsel->stats;
+	struct aggr_cpu_id core_id;
+	struct perf_cpu cpu;
+	int idx;
+
+	if (!evsel->percore)
+		return;
+
+	perf_cpu_map__for_each_cpu(cpu, idx, evsel->core.cpus) {
+		struct perf_stat_aggr *aggr = &ps->aggr[idx];
+
+		if (aggr->used)
+			continue;
+
+		core_id = aggr_cpu_id__core(cpu, NULL);
+		evsel__update_percore_stats(evsel, &core_id);
+	}
+}
+
+/* process cpu stats on per-core events */
+void perf_stat_process_percore(struct perf_stat_config *config, struct evlist *evlist)
+{
+	struct evsel *evsel;
+
+	if (config->aggr_mode != AGGR_NONE)
+		return;
+
+	evlist__for_each_entry(evlist, evsel)
+		evsel__process_percore(evsel);
+}
+
+int perf_event__process_stat_event(struct perf_session *session,
+				   union perf_event *event)
+{
+	struct perf_counts_values count, *ptr;
+	struct perf_record_stat *st = &event->stat;
+	struct evsel *counter;
+	int cpu_map_idx;
+
+	count.val = st->val;
+	count.ena = st->ena;
+	count.run = st->run;
+
+	counter = evlist__id2evsel(session->evlist, st->id);
+	if (!counter) {
+		pr_err("Failed to resolve counter for stat event.\n");
+		return -EINVAL;
+	}
+	cpu_map_idx = perf_cpu_map__idx(evsel__cpus(counter), (struct perf_cpu){.cpu = st->cpu});
+	if (cpu_map_idx == -1) {
+		pr_err("Invalid CPU %d for event %s.\n", st->cpu, evsel__name(counter));
+		return -EINVAL;
+	}
+	ptr = perf_counts(counter->counts, cpu_map_idx, st->thread);
+	if (ptr == NULL) {
+		pr_err("Failed to find perf count for CPU %d thread %d on event %s.\n",
+			st->cpu, st->thread, evsel__name(counter));
+		return -EINVAL;
+	}
+	*ptr = count;
+	counter->supported = true;
+	return 0;
+}
+
+size_t perf_event__fprintf_stat(union perf_event *event, FILE *fp)
+{
+	struct perf_record_stat *st = (struct perf_record_stat *)event;
+	size_t ret;
+
+	ret  = fprintf(fp, "\n... id %" PRI_lu64 ", cpu %d, thread %d\n",
+		       st->id, st->cpu, st->thread);
+	ret += fprintf(fp, "... value %" PRI_lu64 ", enabled %" PRI_lu64 ", running %" PRI_lu64 "\n",
+		       st->val, st->ena, st->run);
+
+	return ret;
+}
+
+size_t perf_event__fprintf_stat_round(union perf_event *event, FILE *fp)
+{
+	struct perf_record_stat_round *rd = (struct perf_record_stat_round *)event;
+	size_t ret;
+
+	ret = fprintf(fp, "\n... time %" PRI_lu64 ", type %s\n", rd->time,
+		      rd->type == PERF_STAT_ROUND_TYPE__FINAL ? "FINAL" : "INTERVAL");
+
+	return ret;
+}
+
+size_t perf_event__fprintf_stat_config(union perf_event *event, FILE *fp)
+{
+	struct perf_stat_config sc = {};
+	size_t ret;
+
+	perf_event__read_stat_config(&sc, &event->stat_config);
+
+	ret  = fprintf(fp, "\n");
+	ret += fprintf(fp, "... aggr_mode %d\n", sc.aggr_mode);
+	ret += fprintf(fp, "... scale     %d\n", sc.scale);
+	ret += fprintf(fp, "... interval  %u\n", sc.interval);
+
+	return ret;
+}
+
+int create_perf_stat_counter(struct evsel *evsel,
+			     struct perf_stat_config *config,
+			     struct target *target,
+			     int cpu_map_idx)
+{
+	struct perf_event_attr *attr = &evsel->core.attr;
+	struct evsel *leader = evsel__leader(evsel);
+
+	attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
+			    PERF_FORMAT_TOTAL_TIME_RUNNING;
+
+	/*
+	 * The event is part of non trivial group, let's enable
+	 * the group read (for leader) and ID retrieval for all
+	 * members.
+	 */
+	if (leader->core.nr_members > 1)
+		attr->read_format |= PERF_FORMAT_ID|PERF_FORMAT_GROUP;
+
+	attr->inherit = !config->no_inherit && list_empty(&evsel->bpf_counter_list);
+
+	/*
+	 * Some events get initialized with sample_(period/type) set,
+	 * like tracepoints. Clear it up for counting.
+	 */
+	attr->sample_period = 0;
+
+	if (config->identifier)
+		attr->sample_type = PERF_SAMPLE_IDENTIFIER;
+
+	if (config->all_user) {
+		attr->exclude_kernel = 1;
+		attr->exclude_user   = 0;
+	}
+
+	if (config->all_kernel) {
+		attr->exclude_kernel = 0;
+		attr->exclude_user   = 1;
+	}
+
+	/*
+	 * Disabling all counters initially, they will be enabled
+	 * either manually by us or by kernel via enable_on_exec
+	 * set later.
+	 */
+	if (evsel__is_group_leader(evsel)) {
+		attr->disabled = 1;
+
+		if (target__enable_on_exec(target))
+			attr->enable_on_exec = 1;
+	}
+
+	if (target__has_cpu(target) && !target__has_per_thread(target))
+		return evsel__open_per_cpu(evsel, evsel__cpus(evsel), cpu_map_idx);
+
+	return evsel__open_per_thread(evsel, evsel->core.threads);
+}