swh:1:snp:c3bf2749e3476071fa748f67b0ffa2fdc5fe49d9
Tip revision: 7e57714cd0ad2d5bb90e50b5096a0e671dec1ef3 authored by Linus Torvalds on 27 February 2022, 22:36:33 UTC
Linux 5.17-rc6
Linux 5.17-rc6
Tip revision: 7e57714
stat.c
// 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 "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;
}
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])) {
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 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 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 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 (!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) {
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 idx, thread;
if (counter->core.system_wide)
nthreads = 1;
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 i, 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);
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 = 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_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;
/*
* 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_map_idx);
return evsel__open_per_thread(evsel, evsel->core.threads);
}