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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /tools/perf/util/stat.c | |
parent | Initial commit. (diff) | |
download | linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.tar.xz linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/perf/util/stat.c')
-rw-r--r-- | tools/perf/util/stat.c | 571 |
1 files changed, 571 insertions, 0 deletions
diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c new file mode 100644 index 000000000..bd0decd6d --- /dev/null +++ b/tools/perf/util/stat.c @@ -0,0 +1,571 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <errno.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 <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_evsel_stat__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(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])) { + ps->id = i; + break; + } + } +} + +static void evsel__reset_stat_priv(struct evsel *evsel) +{ + int i; + struct perf_stat_evsel *ps = evsel->stats; + + for (i = 0; i < 3; i++) + init_stats(&ps->res_stats[i]); + + perf_stat_evsel_id_init(evsel); +} + +static int evsel__alloc_stat_priv(struct evsel *evsel) +{ + evsel->stats = zalloc(sizeof(struct perf_stat_evsel)); + if (evsel->stats == NULL) + 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->group_data); + zfree(&evsel->stats); +} + +static int evsel__alloc_prev_raw_counts(struct evsel *evsel, int ncpus, int nthreads) +{ + struct perf_counts *counts; + + counts = perf_counts__new(ncpus, 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) +{ + int ncpus = evsel__nr_cpus(evsel); + int nthreads = perf_thread_map__nr(evsel->core.threads); + + if (evsel__alloc_stat_priv(evsel) < 0 || + evsel__alloc_counts(evsel, ncpus, nthreads) < 0 || + (alloc_raw && evsel__alloc_prev_raw_counts(evsel, ncpus, nthreads) < 0)) + return -ENOMEM; + + return 0; +} + +int perf_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: + perf_evlist__free_stats(evlist); + return -1; +} + +void perf_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 perf_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 perf_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 perf_evsel__copy_prev_raw_counts(struct evsel *evsel) +{ + int ncpus = evsel__nr_cpus(evsel); + int nthreads = perf_thread_map__nr(evsel->core.threads); + + for (int thread = 0; thread < nthreads; thread++) { + for (int cpu = 0; cpu < ncpus; cpu++) { + *perf_counts(evsel->counts, cpu, thread) = + *perf_counts(evsel->prev_raw_counts, cpu, + thread); + } + } + + evsel->counts->aggr = evsel->prev_raw_counts->aggr; +} + +void perf_evlist__copy_prev_raw_counts(struct evlist *evlist) +{ + struct evsel *evsel; + + evlist__for_each_entry(evlist, evsel) + perf_evsel__copy_prev_raw_counts(evsel); +} + +void perf_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 void zero_per_pkg(struct evsel *counter) +{ + if (counter->per_pkg_mask) + memset(counter->per_pkg_mask, 0, cpu__max_cpu()); +} + +static int check_per_pkg(struct evsel *counter, + struct perf_counts_values *vals, int cpu, bool *skip) +{ + unsigned long *mask = counter->per_pkg_mask; + struct perf_cpu_map *cpus = evsel__cpus(counter); + int s; + + *skip = false; + + if (!counter->per_pkg) + return 0; + + if (perf_cpu_map__empty(cpus)) + return 0; + + if (!mask) { + mask = zalloc(cpu__max_cpu()); + if (!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_map__get_socket(cpus, cpu, NULL); + if (s < 0) + return -1; + + *skip = test_and_set_bit(s, mask) == 1; + return 0; +} + +static int +process_counter_values(struct perf_stat_config *config, struct evsel *evsel, + int cpu, 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, &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, 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, &rt_stat); + } + + if (config->aggr_mode == AGGR_THREAD) { + if (config->stats) + perf_stat__update_shadow_stats(evsel, + count->val, 0, &config->stats[thread]); + else + perf_stat__update_shadow_stats(evsel, + count->val, 0, &rt_stat); + } + break; + case AGGR_GLOBAL: + aggr->val += count->val; + aggr->ena += count->ena; + aggr->run += count->run; + case AGGR_UNSET: + 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 cpu, thread; + + if (counter->core.system_wide) + nthreads = 1; + + for (thread = 0; thread < nthreads; thread++) { + for (cpu = 0; cpu < ncpus; cpu++) { + if (process_counter_values(config, counter, cpu, thread, + perf_counts(counter->counts, cpu, 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 i, ret; + + aggr->val = aggr->ena = aggr->run = 0; + + /* + * We calculate counter's data every interval, + * and the display code shows ps->res_stats + * avg value. We need to zero the stats for + * interval mode, otherwise overall avg running + * averages will be shown for each interval. + */ + if (config->interval || config->summary) { + for (i = 0; i < 3; i++) + init_stats(&ps->res_stats[i]); + } + + if (counter->per_pkg) + 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); + + for (i = 0; i < 3; i++) + update_stats(&ps->res_stats[i], count[i]); + + 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; + struct perf_record_stat *st = &event->stat; + struct evsel *counter; + + count.val = st->val; + count.ena = st->ena; + count.run = st->run; + + counter = perf_evlist__id2evsel(session->evlist, st->id); + if (!counter) { + pr_err("Failed to resolve counter for stat event.\n"); + return -EINVAL; + } + + *perf_counts(counter->counts, st->cpu, st->thread) = 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) +{ + struct perf_event_attr *attr = &evsel->core.attr; + struct evsel *leader = evsel->leader; + + 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; + + /* + * 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; + + /* + * In case of initial_delay we enable tracee + * events manually. + */ + if (target__none(target) && !config->initial_delay) + 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); + + return evsel__open_per_thread(evsel, evsel->core.threads); +} |