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-rw-r--r--tools/perf/util/stat.c594
1 files changed, 594 insertions, 0 deletions
diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c
new file mode 100644
index 000000000..b63b3a312
--- /dev/null
+++ b/tools/perf/util/stat.c
@@ -0,0 +1,594 @@
+// 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"
+#ifdef HAVE_LIBBPF_SUPPORT
+#include <bpf/hashmap.h>
+#else
+#include "util/hashmap.h"
+#endif
+#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;
+}
+
+bool __perf_stat_evsel__is(struct evsel *evsel, enum perf_stat_evsel_id id)
+{
+ struct perf_stat_evsel *ps = evsel->stats;
+
+ return ps->id == id;
+}
+
+#define ID(id, name) [PERF_STAT_EVSEL_ID__##id] = #name
+static const char *id_str[PERF_STAT_EVSEL_ID__MAX] = {
+ ID(NONE, x),
+ ID(CYCLES_IN_TX, cpu/cycles-t/),
+ ID(TRANSACTION_START, cpu/tx-start/),
+ ID(ELISION_START, cpu/el-start/),
+ ID(CYCLES_IN_TX_CP, cpu/cycles-ct/),
+ ID(TOPDOWN_TOTAL_SLOTS, topdown-total-slots),
+ ID(TOPDOWN_SLOTS_ISSUED, topdown-slots-issued),
+ ID(TOPDOWN_SLOTS_RETIRED, topdown-slots-retired),
+ ID(TOPDOWN_FETCH_BUBBLES, topdown-fetch-bubbles),
+ ID(TOPDOWN_RECOVERY_BUBBLES, topdown-recovery-bubbles),
+ ID(TOPDOWN_RETIRING, topdown-retiring),
+ ID(TOPDOWN_BAD_SPEC, topdown-bad-spec),
+ ID(TOPDOWN_FE_BOUND, topdown-fe-bound),
+ ID(TOPDOWN_BE_BOUND, topdown-be-bound),
+ ID(TOPDOWN_HEAVY_OPS, topdown-heavy-ops),
+ ID(TOPDOWN_BR_MISPREDICT, topdown-br-mispredict),
+ ID(TOPDOWN_FETCH_LAT, topdown-fetch-lat),
+ ID(TOPDOWN_MEM_BOUND, topdown-mem-bound),
+ ID(SMI_NUM, msr/smi/),
+ ID(APERF, msr/aperf/),
+};
+#undef ID
+
+static void perf_stat_evsel_id_init(struct evsel *evsel)
+{
+ struct perf_stat_evsel *ps = evsel->stats;
+ int i;
+
+ /* ps->id is 0 hence PERF_STAT_EVSEL_ID__NONE by default */
+
+ for (i = 0; i < PERF_STAT_EVSEL_ID__MAX; i++) {
+ if (!strcmp(evsel__name(evsel), id_str[i]) ||
+ (strstr(evsel__name(evsel), id_str[i]) && evsel->pmu_name
+ && strstr(evsel__name(evsel), evsel->pmu_name))) {
+ ps->id = i;
+ break;
+ }
+ }
+}
+
+static void evsel__reset_stat_priv(struct evsel *evsel)
+{
+ struct perf_stat_evsel *ps = evsel->stats;
+
+ init_stats(&ps->res_stats);
+}
+
+static int evsel__alloc_stat_priv(struct evsel *evsel)
+{
+ evsel->stats = zalloc(sizeof(struct perf_stat_evsel));
+ if (evsel->stats == NULL)
+ return -ENOMEM;
+ perf_stat_evsel_id_init(evsel);
+ 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->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, bool alloc_raw)
+{
+ if (evsel__alloc_stat_priv(evsel) < 0 ||
+ evsel__alloc_counts(evsel) < 0 ||
+ (alloc_raw && evsel__alloc_prev_raw_counts(evsel) < 0))
+ return -ENOMEM;
+
+ return 0;
+}
+
+int evlist__alloc_stats(struct evlist *evlist, bool alloc_raw)
+{
+ struct evsel *evsel;
+
+ evlist__for_each_entry(evlist, evsel) {
+ if (evsel__alloc_stats(evsel, 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_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);
+ }
+ }
+
+ evsel->counts->aggr = evsel->prev_raw_counts->aggr;
+}
+
+void evlist__copy_prev_raw_counts(struct evlist *evlist)
+{
+ struct evsel *evsel;
+
+ evlist__for_each_entry(evlist, evsel)
+ evsel__copy_prev_raw_counts(evsel);
+}
+
+void evlist__save_aggr_prev_raw_counts(struct evlist *evlist)
+{
+ struct evsel *evsel;
+
+ /*
+ * To collect the overall statistics for interval mode,
+ * we copy the counts from evsel->prev_raw_counts to
+ * evsel->counts. The perf_stat_process_counter creates
+ * aggr values from per cpu values, but the per cpu values
+ * are 0 for AGGR_GLOBAL. So we use a trick that saves the
+ * previous aggr value to the first member of perf_counts,
+ * then aggr calculation in process_counter_values can work
+ * correctly.
+ */
+ evlist__for_each_entry(evlist, evsel) {
+ *perf_counts(evsel->prev_raw_counts, 0, 0) =
+ evsel->prev_raw_counts->aggr;
+ }
+}
+
+static size_t pkg_id_hash(const void *__key, void *ctx __maybe_unused)
+{
+ uint64_t *key = (uint64_t *) __key;
+
+ return *key & 0xffffffff;
+}
+
+static bool pkg_id_equal(const void *__key1, const void *__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, (void *)key, NULL)) {
+ *skip = true;
+ free(key);
+ } else
+ ret = hashmap__add(mask, (void *)key, (void *)1);
+
+ return ret;
+}
+
+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_counts_values *aggr = &evsel->counts->aggr;
+ 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;
+
+ switch (config->aggr_mode) {
+ case AGGR_THREAD:
+ case AGGR_CORE:
+ case AGGR_DIE:
+ case AGGR_SOCKET:
+ case AGGR_NODE:
+ case AGGR_NONE:
+ 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_NONE) && (!evsel->percore)) {
+ perf_stat__update_shadow_stats(evsel, count->val,
+ cpu_map_idx, &rt_stat);
+ }
+
+ if (config->aggr_mode == AGGR_THREAD) {
+ perf_stat__update_shadow_stats(evsel, count->val,
+ thread, &rt_stat);
+ }
+ break;
+ case AGGR_GLOBAL:
+ aggr->val += count->val;
+ aggr->ena += count->ena;
+ aggr->run += count->run;
+ case AGGR_UNSET:
+ case AGGR_MAX:
+ default:
+ 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_counts_values *aggr = &counter->counts->aggr;
+ struct perf_stat_evsel *ps = counter->stats;
+ u64 *count = counter->counts->aggr.values;
+ int ret;
+
+ aggr->val = aggr->ena = aggr->run = 0;
+
+ 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;
+
+ if (!counter->snapshot)
+ evsel__compute_deltas(counter, -1, -1, aggr);
+ perf_counts_values__scale(aggr, config->scale, &counter->counts->scaled);
+
+ 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]);
+ }
+
+ /*
+ * Save the full runtime - to allow normalization during printout:
+ */
+ perf_stat__update_shadow_stats(counter, *count, 0, &rt_stat);
+
+ return 0;
+}
+
+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);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-04 13:13:21 +0000