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https://github.com/edk2-porting/linux-next.git
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75998bb263
The -c option to enable multiplex scaling has been useless for quite some time because scaling is default. It's only useful as --no-scale to disable scaling. But the non scaling code path has bitrotted and doesn't print anything because perf output code relies on value run/ena information. Also even when we don't want to scale a value it's still useful to show its multiplex percentage. This patch: - Fixes help and documentation to show --no-scale instead of -c - Removes -c, only keeps the long option because -c doesn't support negatives. - Enables running/enabled even with --no-scale - And fixes some other problems in the no-scale output. Before: $ perf stat --no-scale -e cycles true Performance counter stats for 'true': <not counted> cycles 0.000984154 seconds time elapsed After: $ ./perf stat --no-scale -e cycles true Performance counter stats for 'true': 706,070 cycles 0.001219821 seconds time elapsed Signed-off-by: Andi Kleen <ak@linux.intel.com> Acked-by: Jiri Olsa <jolsa@kernel.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> LPU-Reference: 20190314225002.30108-9-andi@firstfloor.org Link: https://lkml.kernel.org/n/tip-xggjvwcdaj2aqy8ib3i4b1g6@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
528 lines
12 KiB
C
528 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <errno.h>
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#include <inttypes.h>
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#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_evsel *ps = evsel->stats;
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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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ID(TOPDOWN_TOTAL_SLOTS, topdown-total-slots),
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ID(TOPDOWN_SLOTS_ISSUED, topdown-slots-issued),
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ID(TOPDOWN_SLOTS_RETIRED, topdown-slots-retired),
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ID(TOPDOWN_FETCH_BUBBLES, topdown-fetch-bubbles),
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ID(TOPDOWN_RECOVERY_BUBBLES, topdown-recovery-bubbles),
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ID(SMI_NUM, msr/smi/),
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ID(APERF, msr/aperf/),
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};
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#undef ID
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static void perf_stat_evsel_id_init(struct perf_evsel *evsel)
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{
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struct perf_stat_evsel *ps = evsel->stats;
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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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static 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_evsel *ps = evsel->stats;
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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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static int perf_evsel__alloc_stat_priv(struct perf_evsel *evsel)
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{
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evsel->stats = zalloc(sizeof(struct perf_stat_evsel));
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if (evsel->stats == 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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static void perf_evsel__free_stat_priv(struct perf_evsel *evsel)
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{
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struct perf_stat_evsel *ps = evsel->stats;
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if (ps)
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free(ps->group_data);
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zfree(&evsel->stats);
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}
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static 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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static 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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static 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_entry(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_entry(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_entry(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,
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struct perf_counts_values *vals, 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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/*
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* we do not consider an event that has not run as a good
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* instance to mark a package as used (skip=1). Otherwise
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* we may run into a situation where the first CPU in a package
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* is not running anything, yet the second is, and this function
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* would mark the package as used after the first CPU and would
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* not read the values from the second CPU.
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*/
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if (!(vals->run && vals->ena))
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return 0;
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s = cpu_map__get_socket(cpus, cpu, NULL);
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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, count, 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->val, cpu,
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&rt_stat);
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if (config->aggr_mode == AGGR_THREAD) {
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if (config->stats)
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perf_stat__update_shadow_stats(evsel,
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count->val, 0, &config->stats[thread]);
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else
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perf_stat__update_shadow_stats(evsel,
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count->val, 0, &rt_stat);
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}
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break;
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case AGGR_GLOBAL:
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aggr->val += count->val;
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aggr->ena += count->ena;
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aggr->run += count->run;
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case AGGR_UNSET:
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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_evsel *ps = counter->stats;
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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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/*
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* We calculate counter's data every interval,
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* and the display code shows ps->res_stats
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* avg value. We need to zero the stats for
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* interval mode, otherwise overall avg running
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* averages will be shown for each interval.
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*/
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if (config->interval)
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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 > 0) {
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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, &rt_stat);
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return 0;
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}
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int perf_event__process_stat_event(struct perf_session *session,
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union perf_event *event)
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{
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struct perf_counts_values count;
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struct stat_event *st = &event->stat;
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struct perf_evsel *counter;
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count.val = st->val;
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count.ena = st->ena;
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count.run = st->run;
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counter = perf_evlist__id2evsel(session->evlist, st->id);
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if (!counter) {
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pr_err("Failed to resolve counter for stat event.\n");
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return -EINVAL;
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}
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*perf_counts(counter->counts, st->cpu, st->thread) = count;
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counter->supported = true;
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return 0;
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}
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size_t perf_event__fprintf_stat(union perf_event *event, FILE *fp)
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{
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struct stat_event *st = (struct stat_event *) event;
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size_t ret;
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ret = fprintf(fp, "\n... id %" PRIu64 ", cpu %d, thread %d\n",
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st->id, st->cpu, st->thread);
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ret += fprintf(fp, "... value %" PRIu64 ", enabled %" PRIu64 ", running %" PRIu64 "\n",
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st->val, st->ena, st->run);
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return ret;
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}
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size_t perf_event__fprintf_stat_round(union perf_event *event, FILE *fp)
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{
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struct stat_round_event *rd = (struct stat_round_event *)event;
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size_t ret;
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ret = fprintf(fp, "\n... time %" PRIu64 ", type %s\n", rd->time,
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rd->type == PERF_STAT_ROUND_TYPE__FINAL ? "FINAL" : "INTERVAL");
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return ret;
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}
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size_t perf_event__fprintf_stat_config(union perf_event *event, FILE *fp)
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{
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struct perf_stat_config sc;
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size_t ret;
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perf_event__read_stat_config(&sc, &event->stat_config);
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ret = fprintf(fp, "\n");
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ret += fprintf(fp, "... aggr_mode %d\n", sc.aggr_mode);
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ret += fprintf(fp, "... scale %d\n", sc.scale);
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ret += fprintf(fp, "... interval %u\n", sc.interval);
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return ret;
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}
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int create_perf_stat_counter(struct perf_evsel *evsel,
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struct perf_stat_config *config,
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struct target *target)
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{
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struct perf_event_attr *attr = &evsel->attr;
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struct perf_evsel *leader = evsel->leader;
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attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
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PERF_FORMAT_TOTAL_TIME_RUNNING;
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/*
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* The event is part of non trivial group, let's enable
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* the group read (for leader) and ID retrieval for all
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* members.
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*/
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if (leader->nr_members > 1)
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attr->read_format |= PERF_FORMAT_ID|PERF_FORMAT_GROUP;
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attr->inherit = !config->no_inherit;
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/*
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* Some events get initialized with sample_(period/type) set,
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* like tracepoints. Clear it up for counting.
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*/
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attr->sample_period = 0;
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if (config->identifier)
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attr->sample_type = PERF_SAMPLE_IDENTIFIER;
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/*
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* Disabling all counters initially, they will be enabled
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* either manually by us or by kernel via enable_on_exec
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* set later.
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*/
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if (perf_evsel__is_group_leader(evsel)) {
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attr->disabled = 1;
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/*
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* In case of initial_delay we enable tracee
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* events manually.
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*/
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if (target__none(target) && !config->initial_delay)
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attr->enable_on_exec = 1;
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}
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if (target__has_cpu(target) && !target__has_per_thread(target))
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return perf_evsel__open_per_cpu(evsel, perf_evsel__cpus(evsel));
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return perf_evsel__open_per_thread(evsel, evsel->threads);
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}
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int perf_stat_synthesize_config(struct perf_stat_config *config,
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struct perf_tool *tool,
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struct perf_evlist *evlist,
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perf_event__handler_t process,
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bool attrs)
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{
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int err;
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if (attrs) {
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err = perf_event__synthesize_attrs(tool, evlist, process);
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if (err < 0) {
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pr_err("Couldn't synthesize attrs.\n");
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return err;
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}
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}
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err = perf_event__synthesize_extra_attr(tool, evlist, process,
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attrs);
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err = perf_event__synthesize_thread_map2(tool, evlist->threads,
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process, NULL);
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if (err < 0) {
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|
pr_err("Couldn't synthesize thread map.\n");
|
|
return err;
|
|
}
|
|
|
|
err = perf_event__synthesize_cpu_map(tool, evlist->cpus,
|
|
process, NULL);
|
|
if (err < 0) {
|
|
pr_err("Couldn't synthesize thread map.\n");
|
|
return err;
|
|
}
|
|
|
|
err = perf_event__synthesize_stat_config(tool, config, process, NULL);
|
|
if (err < 0) {
|
|
pr_err("Couldn't synthesize config.\n");
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|