331 lines
6.8 KiB
C
331 lines
6.8 KiB
C
#include <math.h>
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#include "stat.h"
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#include "evlist.h"
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#include "evsel.h"
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#include "thread_map.h"
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void update_stats(struct stats *stats, u64 val)
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{
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double delta;
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stats->n++;
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delta = val - stats->mean;
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stats->mean += delta / stats->n;
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stats->M2 += delta*(val - stats->mean);
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if (val > stats->max)
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stats->max = val;
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if (val < stats->min)
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stats->min = val;
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}
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double avg_stats(struct stats *stats)
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{
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return stats->mean;
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}
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/*
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* http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance
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*
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* (\Sum n_i^2) - ((\Sum n_i)^2)/n
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* s^2 = -------------------------------
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* n - 1
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*
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* http://en.wikipedia.org/wiki/Stddev
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*
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* The std dev of the mean is related to the std dev by:
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*
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* s
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* s_mean = -------
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* sqrt(n)
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*
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*/
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double stddev_stats(struct stats *stats)
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{
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double variance, variance_mean;
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if (stats->n < 2)
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return 0.0;
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variance = stats->M2 / (stats->n - 1);
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variance_mean = variance / stats->n;
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return sqrt(variance_mean);
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}
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double rel_stddev_stats(double stddev, double avg)
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{
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double pct = 0.0;
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if (avg)
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pct = 100.0 * stddev/avg;
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return pct;
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}
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bool __perf_evsel_stat__is(struct perf_evsel *evsel,
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enum perf_stat_evsel_id id)
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{
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struct perf_stat *ps = evsel->priv;
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return ps->id == id;
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}
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#define ID(id, name) [PERF_STAT_EVSEL_ID__##id] = #name
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static const char *id_str[PERF_STAT_EVSEL_ID__MAX] = {
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ID(NONE, x),
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ID(CYCLES_IN_TX, cpu/cycles-t/),
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ID(TRANSACTION_START, cpu/tx-start/),
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ID(ELISION_START, cpu/el-start/),
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ID(CYCLES_IN_TX_CP, cpu/cycles-ct/),
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};
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#undef ID
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void perf_stat_evsel_id_init(struct perf_evsel *evsel)
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{
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struct perf_stat *ps = evsel->priv;
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int i;
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/* ps->id is 0 hence PERF_STAT_EVSEL_ID__NONE by default */
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for (i = 0; i < PERF_STAT_EVSEL_ID__MAX; i++) {
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if (!strcmp(perf_evsel__name(evsel), id_str[i])) {
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ps->id = i;
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break;
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}
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}
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}
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void perf_evsel__reset_stat_priv(struct perf_evsel *evsel)
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{
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int i;
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struct perf_stat *ps = evsel->priv;
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for (i = 0; i < 3; i++)
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init_stats(&ps->res_stats[i]);
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perf_stat_evsel_id_init(evsel);
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}
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int perf_evsel__alloc_stat_priv(struct perf_evsel *evsel)
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{
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evsel->priv = zalloc(sizeof(struct perf_stat));
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if (evsel->priv == NULL)
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return -ENOMEM;
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perf_evsel__reset_stat_priv(evsel);
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return 0;
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}
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void perf_evsel__free_stat_priv(struct perf_evsel *evsel)
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{
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zfree(&evsel->priv);
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}
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int perf_evsel__alloc_prev_raw_counts(struct perf_evsel *evsel,
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int ncpus, int nthreads)
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{
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struct perf_counts *counts;
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counts = perf_counts__new(ncpus, nthreads);
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if (counts)
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evsel->prev_raw_counts = counts;
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return counts ? 0 : -ENOMEM;
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}
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void perf_evsel__free_prev_raw_counts(struct perf_evsel *evsel)
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{
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perf_counts__delete(evsel->prev_raw_counts);
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evsel->prev_raw_counts = NULL;
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}
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int perf_evsel__alloc_stats(struct perf_evsel *evsel, bool alloc_raw)
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{
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int ncpus = perf_evsel__nr_cpus(evsel);
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int nthreads = thread_map__nr(evsel->threads);
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if (perf_evsel__alloc_stat_priv(evsel) < 0 ||
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perf_evsel__alloc_counts(evsel, ncpus, nthreads) < 0 ||
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(alloc_raw && perf_evsel__alloc_prev_raw_counts(evsel, ncpus, nthreads) < 0))
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return -ENOMEM;
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return 0;
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}
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int perf_evlist__alloc_stats(struct perf_evlist *evlist, bool alloc_raw)
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{
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struct perf_evsel *evsel;
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evlist__for_each(evlist, evsel) {
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if (perf_evsel__alloc_stats(evsel, alloc_raw))
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goto out_free;
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}
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return 0;
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out_free:
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perf_evlist__free_stats(evlist);
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return -1;
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}
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void perf_evlist__free_stats(struct perf_evlist *evlist)
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{
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struct perf_evsel *evsel;
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evlist__for_each(evlist, evsel) {
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perf_evsel__free_stat_priv(evsel);
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perf_evsel__free_counts(evsel);
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perf_evsel__free_prev_raw_counts(evsel);
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}
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}
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void perf_evlist__reset_stats(struct perf_evlist *evlist)
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{
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struct perf_evsel *evsel;
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evlist__for_each(evlist, evsel) {
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perf_evsel__reset_stat_priv(evsel);
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perf_evsel__reset_counts(evsel);
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}
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}
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static void zero_per_pkg(struct perf_evsel *counter)
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{
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if (counter->per_pkg_mask)
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memset(counter->per_pkg_mask, 0, MAX_NR_CPUS);
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}
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static int check_per_pkg(struct perf_evsel *counter, int cpu, bool *skip)
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{
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unsigned long *mask = counter->per_pkg_mask;
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struct cpu_map *cpus = perf_evsel__cpus(counter);
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int s;
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*skip = false;
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if (!counter->per_pkg)
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return 0;
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if (cpu_map__empty(cpus))
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return 0;
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if (!mask) {
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mask = zalloc(MAX_NR_CPUS);
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if (!mask)
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return -ENOMEM;
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counter->per_pkg_mask = mask;
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}
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s = cpu_map__get_socket(cpus, cpu);
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if (s < 0)
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return -1;
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*skip = test_and_set_bit(s, mask) == 1;
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return 0;
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}
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static int
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process_counter_values(struct perf_stat_config *config, struct perf_evsel *evsel,
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int cpu, int thread,
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struct perf_counts_values *count)
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{
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struct perf_counts_values *aggr = &evsel->counts->aggr;
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static struct perf_counts_values zero;
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bool skip = false;
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if (check_per_pkg(evsel, cpu, &skip)) {
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pr_err("failed to read per-pkg counter\n");
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return -1;
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}
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if (skip)
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count = &zero;
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switch (config->aggr_mode) {
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case AGGR_THREAD:
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case AGGR_CORE:
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case AGGR_SOCKET:
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case AGGR_NONE:
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if (!evsel->snapshot)
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perf_evsel__compute_deltas(evsel, cpu, thread, count);
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perf_counts_values__scale(count, config->scale, NULL);
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if (config->aggr_mode == AGGR_NONE)
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perf_stat__update_shadow_stats(evsel, count->values, cpu);
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break;
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case AGGR_GLOBAL:
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aggr->val += count->val;
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if (config->scale) {
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aggr->ena += count->ena;
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aggr->run += count->run;
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}
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default:
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break;
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}
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return 0;
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}
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static int process_counter_maps(struct perf_stat_config *config,
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struct perf_evsel *counter)
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{
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int nthreads = thread_map__nr(counter->threads);
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int ncpus = perf_evsel__nr_cpus(counter);
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int cpu, thread;
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if (counter->system_wide)
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nthreads = 1;
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for (thread = 0; thread < nthreads; thread++) {
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for (cpu = 0; cpu < ncpus; cpu++) {
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if (process_counter_values(config, counter, cpu, thread,
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perf_counts(counter->counts, cpu, thread)))
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return -1;
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}
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}
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return 0;
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}
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int perf_stat_process_counter(struct perf_stat_config *config,
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struct perf_evsel *counter)
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{
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struct perf_counts_values *aggr = &counter->counts->aggr;
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struct perf_stat *ps = counter->priv;
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u64 *count = counter->counts->aggr.values;
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int i, ret;
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aggr->val = aggr->ena = aggr->run = 0;
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init_stats(ps->res_stats);
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if (counter->per_pkg)
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zero_per_pkg(counter);
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ret = process_counter_maps(config, counter);
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if (ret)
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return ret;
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if (config->aggr_mode != AGGR_GLOBAL)
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return 0;
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if (!counter->snapshot)
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perf_evsel__compute_deltas(counter, -1, -1, aggr);
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perf_counts_values__scale(aggr, config->scale, &counter->counts->scaled);
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for (i = 0; i < 3; i++)
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update_stats(&ps->res_stats[i], count[i]);
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if (verbose) {
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fprintf(config->output, "%s: %" PRIu64 " %" PRIu64 " %" PRIu64 "\n",
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perf_evsel__name(counter), count[0], count[1], count[2]);
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}
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/*
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* Save the full runtime - to allow normalization during printout:
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*/
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perf_stat__update_shadow_stats(counter, count, 0);
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return 0;
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}
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