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0b9462d0ac
Try to disambiguate further when perf_counts is being accessed it is with a cpu map index rather than a CPU. Signed-off-by: Ian Rogers <irogers@google.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Andrii Nakryiko <andrii@kernel.org> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Dave Marchevsky <davemarchevsky@fb.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Clark <james.clark@arm.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: John Fastabend <john.fastabend@gmail.com> Cc: KP Singh <kpsingh@kernel.org> Cc: Kan Liang <kan.liang@linux.intel.com> Cc: Lv Ruyi <lv.ruyi@zte.com.cn> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Martin KaFai Lau <kafai@fb.com> Cc: Michael Petlan <mpetlan@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Quentin Monnet <quentin@isovalent.com> Cc: Song Liu <songliubraving@fb.com> Cc: Stephane Eranian <eranian@google.com> Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com> Cc: Yonghong Song <yhs@fb.com> Cc: bpf@vger.kernel.org Cc: netdev@vger.kernel.org Link: https://lore.kernel.org/r/20220519032005.1273691-6-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
605 lines
14 KiB
C
605 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <errno.h>
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#include <linux/err.h>
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#include <inttypes.h>
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#include <math.h>
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#include <string.h>
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#include "counts.h"
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#include "cpumap.h"
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#include "debug.h"
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#include "header.h"
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#include "stat.h"
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#include "session.h"
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#include "target.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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#include "hashmap.h"
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#include <linux/zalloc.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_stat_evsel__is(struct evsel *evsel, 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(TOPDOWN_RETIRING, topdown-retiring),
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ID(TOPDOWN_BAD_SPEC, topdown-bad-spec),
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ID(TOPDOWN_FE_BOUND, topdown-fe-bound),
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ID(TOPDOWN_BE_BOUND, topdown-be-bound),
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ID(TOPDOWN_HEAVY_OPS, topdown-heavy-ops),
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ID(TOPDOWN_BR_MISPREDICT, topdown-br-mispredict),
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ID(TOPDOWN_FETCH_LAT, topdown-fetch-lat),
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ID(TOPDOWN_MEM_BOUND, topdown-mem-bound),
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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 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(evsel__name(evsel), id_str[i]) ||
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(strstr(evsel__name(evsel), id_str[i]) && evsel->pmu_name
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&& strstr(evsel__name(evsel), evsel->pmu_name))) {
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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 evsel__reset_stat_priv(struct 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 evsel__alloc_stat_priv(struct 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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evsel__reset_stat_priv(evsel);
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return 0;
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}
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static void evsel__free_stat_priv(struct 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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zfree(&ps->group_data);
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zfree(&evsel->stats);
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}
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static int evsel__alloc_prev_raw_counts(struct evsel *evsel)
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{
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int cpu_map_nr = evsel__nr_cpus(evsel);
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int nthreads = perf_thread_map__nr(evsel->core.threads);
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struct perf_counts *counts;
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counts = perf_counts__new(cpu_map_nr, 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 evsel__free_prev_raw_counts(struct 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 void evsel__reset_prev_raw_counts(struct evsel *evsel)
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{
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if (evsel->prev_raw_counts)
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perf_counts__reset(evsel->prev_raw_counts);
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}
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static int evsel__alloc_stats(struct evsel *evsel, bool alloc_raw)
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{
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if (evsel__alloc_stat_priv(evsel) < 0 ||
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evsel__alloc_counts(evsel) < 0 ||
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(alloc_raw && evsel__alloc_prev_raw_counts(evsel) < 0))
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return -ENOMEM;
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return 0;
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}
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int evlist__alloc_stats(struct evlist *evlist, bool alloc_raw)
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{
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struct evsel *evsel;
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evlist__for_each_entry(evlist, evsel) {
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if (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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evlist__free_stats(evlist);
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return -1;
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}
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void evlist__free_stats(struct evlist *evlist)
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{
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struct evsel *evsel;
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evlist__for_each_entry(evlist, evsel) {
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evsel__free_stat_priv(evsel);
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evsel__free_counts(evsel);
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evsel__free_prev_raw_counts(evsel);
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}
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}
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void evlist__reset_stats(struct evlist *evlist)
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{
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struct evsel *evsel;
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evlist__for_each_entry(evlist, evsel) {
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evsel__reset_stat_priv(evsel);
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evsel__reset_counts(evsel);
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}
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}
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void evlist__reset_prev_raw_counts(struct evlist *evlist)
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{
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struct evsel *evsel;
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evlist__for_each_entry(evlist, evsel)
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evsel__reset_prev_raw_counts(evsel);
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}
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static void evsel__copy_prev_raw_counts(struct evsel *evsel)
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{
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int idx, nthreads = perf_thread_map__nr(evsel->core.threads);
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for (int thread = 0; thread < nthreads; thread++) {
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perf_cpu_map__for_each_idx(idx, evsel__cpus(evsel)) {
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*perf_counts(evsel->counts, idx, thread) =
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*perf_counts(evsel->prev_raw_counts, idx, thread);
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}
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}
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evsel->counts->aggr = evsel->prev_raw_counts->aggr;
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}
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void evlist__copy_prev_raw_counts(struct evlist *evlist)
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{
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struct evsel *evsel;
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evlist__for_each_entry(evlist, evsel)
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evsel__copy_prev_raw_counts(evsel);
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}
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void evlist__save_aggr_prev_raw_counts(struct evlist *evlist)
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{
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struct evsel *evsel;
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/*
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* To collect the overall statistics for interval mode,
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* we copy the counts from evsel->prev_raw_counts to
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* evsel->counts. The perf_stat_process_counter creates
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* aggr values from per cpu values, but the per cpu values
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* are 0 for AGGR_GLOBAL. So we use a trick that saves the
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* previous aggr value to the first member of perf_counts,
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* then aggr calculation in process_counter_values can work
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* correctly.
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*/
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evlist__for_each_entry(evlist, evsel) {
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*perf_counts(evsel->prev_raw_counts, 0, 0) =
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evsel->prev_raw_counts->aggr;
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}
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}
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static size_t pkg_id_hash(const void *__key, void *ctx __maybe_unused)
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{
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uint64_t *key = (uint64_t *) __key;
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return *key & 0xffffffff;
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}
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static bool pkg_id_equal(const void *__key1, const void *__key2,
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void *ctx __maybe_unused)
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{
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uint64_t *key1 = (uint64_t *) __key1;
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uint64_t *key2 = (uint64_t *) __key2;
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return *key1 == *key2;
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}
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static int check_per_pkg(struct evsel *counter, struct perf_counts_values *vals,
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int cpu_map_idx, bool *skip)
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{
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struct hashmap *mask = counter->per_pkg_mask;
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struct perf_cpu_map *cpus = evsel__cpus(counter);
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struct perf_cpu cpu = perf_cpu_map__cpu(cpus, cpu_map_idx);
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int s, d, ret = 0;
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uint64_t *key;
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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 (perf_cpu_map__empty(cpus))
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return 0;
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if (!mask) {
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mask = hashmap__new(pkg_id_hash, pkg_id_equal, NULL);
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if (IS_ERR(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__get_socket_id(cpu);
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if (s < 0)
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return -1;
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/*
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* On multi-die system, die_id > 0. On no-die system, die_id = 0.
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* We use hashmap(socket, die) to check the used socket+die pair.
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*/
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d = cpu__get_die_id(cpu);
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if (d < 0)
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return -1;
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key = malloc(sizeof(*key));
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if (!key)
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return -ENOMEM;
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*key = (uint64_t)d << 32 | s;
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if (hashmap__find(mask, (void *)key, NULL)) {
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*skip = true;
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free(key);
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} else
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ret = hashmap__add(mask, (void *)key, (void *)1);
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return ret;
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}
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static int
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process_counter_values(struct perf_stat_config *config, struct evsel *evsel,
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int cpu_map_idx, 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_map_idx, &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_DIE:
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case AGGR_SOCKET:
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case AGGR_NODE:
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case AGGR_NONE:
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if (!evsel->snapshot)
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evsel__compute_deltas(evsel, cpu_map_idx, thread, count);
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perf_counts_values__scale(count, config->scale, NULL);
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if ((config->aggr_mode == AGGR_NONE) && (!evsel->percore)) {
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perf_stat__update_shadow_stats(evsel, count->val,
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cpu_map_idx, &rt_stat);
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}
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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 evsel *counter)
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{
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int nthreads = perf_thread_map__nr(counter->core.threads);
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int ncpus = evsel__nr_cpus(counter);
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int idx, thread;
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if (counter->core.system_wide)
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nthreads = 1;
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for (thread = 0; thread < nthreads; thread++) {
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for (idx = 0; idx < ncpus; idx++) {
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if (process_counter_values(config, counter, idx, thread,
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perf_counts(counter->counts, idx, 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 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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if (counter->per_pkg)
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evsel__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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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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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, *ptr;
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struct perf_record_stat *st = &event->stat;
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struct evsel *counter;
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int cpu_map_idx;
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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 = 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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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;
|
|
|
|
/*
|
|
* 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);
|
|
}
|