343 lines
8.1 KiB
C
343 lines
8.1 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Compare and figure out the top N hottest streams
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* Copyright (c) 2020, Intel Corporation.
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* Author: Jin Yao
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*/
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#include <inttypes.h>
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#include <stdlib.h>
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#include <linux/zalloc.h>
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#include "debug.h"
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#include "hist.h"
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#include "sort.h"
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#include "stream.h"
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#include "evlist.h"
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static void evsel_streams__delete(struct evsel_streams *es, int nr_evsel)
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{
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for (int i = 0; i < nr_evsel; i++)
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zfree(&es[i].streams);
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free(es);
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}
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void evlist_streams__delete(struct evlist_streams *els)
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{
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evsel_streams__delete(els->ev_streams, els->nr_evsel);
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free(els);
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}
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static struct evlist_streams *evlist_streams__new(int nr_evsel,
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int nr_streams_max)
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{
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struct evlist_streams *els;
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struct evsel_streams *es;
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els = zalloc(sizeof(*els));
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if (!els)
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return NULL;
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es = calloc(nr_evsel, sizeof(struct evsel_streams));
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if (!es) {
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free(els);
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return NULL;
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}
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for (int i = 0; i < nr_evsel; i++) {
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struct evsel_streams *s = &es[i];
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s->streams = calloc(nr_streams_max, sizeof(struct stream));
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if (!s->streams)
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goto err;
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s->nr_streams_max = nr_streams_max;
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s->evsel_idx = -1;
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}
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els->ev_streams = es;
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els->nr_evsel = nr_evsel;
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return els;
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err:
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evsel_streams__delete(es, nr_evsel);
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return NULL;
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}
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/*
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* The cnodes with high hit number are hot callchains.
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*/
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static void evsel_streams__set_hot_cnode(struct evsel_streams *es,
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struct callchain_node *cnode)
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{
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int i, idx = 0;
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u64 hit;
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if (es->nr_streams < es->nr_streams_max) {
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i = es->nr_streams;
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es->streams[i].cnode = cnode;
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es->nr_streams++;
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return;
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}
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/*
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* Considering a few number of hot streams, only use simple
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* way to find the cnode with smallest hit number and replace.
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*/
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hit = (es->streams[0].cnode)->hit;
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for (i = 1; i < es->nr_streams; i++) {
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if ((es->streams[i].cnode)->hit < hit) {
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hit = (es->streams[i].cnode)->hit;
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idx = i;
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}
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}
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if (cnode->hit > hit)
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es->streams[idx].cnode = cnode;
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}
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static void update_hot_callchain(struct hist_entry *he,
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struct evsel_streams *es)
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{
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struct rb_root *root = &he->sorted_chain;
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struct rb_node *rb_node = rb_first(root);
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struct callchain_node *cnode;
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while (rb_node) {
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cnode = rb_entry(rb_node, struct callchain_node, rb_node);
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evsel_streams__set_hot_cnode(es, cnode);
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rb_node = rb_next(rb_node);
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}
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}
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static void init_hot_callchain(struct hists *hists, struct evsel_streams *es)
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{
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struct rb_node *next = rb_first_cached(&hists->entries);
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while (next) {
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struct hist_entry *he;
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he = rb_entry(next, struct hist_entry, rb_node);
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update_hot_callchain(he, es);
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next = rb_next(&he->rb_node);
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}
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es->streams_hits = callchain_total_hits(hists);
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}
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static int evlist__init_callchain_streams(struct evlist *evlist,
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struct evlist_streams *els)
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{
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struct evsel_streams *es = els->ev_streams;
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struct evsel *pos;
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int i = 0;
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BUG_ON(els->nr_evsel < evlist->core.nr_entries);
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evlist__for_each_entry(evlist, pos) {
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struct hists *hists = evsel__hists(pos);
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hists__output_resort(hists, NULL);
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init_hot_callchain(hists, &es[i]);
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es[i].evsel_idx = pos->core.idx;
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i++;
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}
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return 0;
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}
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struct evlist_streams *evlist__create_streams(struct evlist *evlist,
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int nr_streams_max)
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{
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int nr_evsel = evlist->core.nr_entries, ret = -1;
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struct evlist_streams *els = evlist_streams__new(nr_evsel,
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nr_streams_max);
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if (!els)
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return NULL;
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ret = evlist__init_callchain_streams(evlist, els);
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if (ret) {
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evlist_streams__delete(els);
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return NULL;
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}
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return els;
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}
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struct evsel_streams *evsel_streams__entry(struct evlist_streams *els,
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int evsel_idx)
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{
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struct evsel_streams *es = els->ev_streams;
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for (int i = 0; i < els->nr_evsel; i++) {
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if (es[i].evsel_idx == evsel_idx)
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return &es[i];
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}
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return NULL;
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}
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static struct stream *stream__callchain_match(struct stream *base_stream,
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struct evsel_streams *es_pair)
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{
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for (int i = 0; i < es_pair->nr_streams; i++) {
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struct stream *pair_stream = &es_pair->streams[i];
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if (callchain_cnode_matched(base_stream->cnode,
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pair_stream->cnode)) {
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return pair_stream;
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}
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}
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return NULL;
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}
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static struct stream *stream__match(struct stream *base_stream,
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struct evsel_streams *es_pair)
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{
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return stream__callchain_match(base_stream, es_pair);
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}
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static void stream__link(struct stream *base_stream, struct stream *pair_stream)
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{
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base_stream->pair_cnode = pair_stream->cnode;
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pair_stream->pair_cnode = base_stream->cnode;
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}
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void evsel_streams__match(struct evsel_streams *es_base,
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struct evsel_streams *es_pair)
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{
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for (int i = 0; i < es_base->nr_streams; i++) {
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struct stream *base_stream = &es_base->streams[i];
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struct stream *pair_stream;
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pair_stream = stream__match(base_stream, es_pair);
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if (pair_stream)
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stream__link(base_stream, pair_stream);
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}
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}
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static void print_callchain_pair(struct stream *base_stream, int idx,
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struct evsel_streams *es_base,
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struct evsel_streams *es_pair)
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{
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struct callchain_node *base_cnode = base_stream->cnode;
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struct callchain_node *pair_cnode = base_stream->pair_cnode;
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struct callchain_list *base_chain, *pair_chain;
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char buf1[512], buf2[512], cbuf1[256], cbuf2[256];
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char *s1, *s2;
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double pct;
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printf("\nhot chain pair %d:\n", idx);
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pct = (double)base_cnode->hit / (double)es_base->streams_hits;
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scnprintf(buf1, sizeof(buf1), "cycles: %ld, hits: %.2f%%",
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callchain_avg_cycles(base_cnode), pct * 100.0);
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pct = (double)pair_cnode->hit / (double)es_pair->streams_hits;
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scnprintf(buf2, sizeof(buf2), "cycles: %ld, hits: %.2f%%",
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callchain_avg_cycles(pair_cnode), pct * 100.0);
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printf("%35s\t%35s\n", buf1, buf2);
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printf("%35s\t%35s\n",
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"---------------------------",
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"--------------------------");
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pair_chain = list_first_entry(&pair_cnode->val,
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struct callchain_list,
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list);
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list_for_each_entry(base_chain, &base_cnode->val, list) {
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if (&pair_chain->list == &pair_cnode->val)
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return;
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s1 = callchain_list__sym_name(base_chain, cbuf1, sizeof(cbuf1),
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false);
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s2 = callchain_list__sym_name(pair_chain, cbuf2, sizeof(cbuf2),
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false);
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scnprintf(buf1, sizeof(buf1), "%35s\t%35s", s1, s2);
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printf("%s\n", buf1);
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pair_chain = list_next_entry(pair_chain, list);
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}
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}
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static void print_stream_callchain(struct stream *stream, int idx,
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struct evsel_streams *es, bool pair)
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{
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struct callchain_node *cnode = stream->cnode;
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struct callchain_list *chain;
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char buf[512], cbuf[256], *s;
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double pct;
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printf("\nhot chain %d:\n", idx);
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pct = (double)cnode->hit / (double)es->streams_hits;
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scnprintf(buf, sizeof(buf), "cycles: %ld, hits: %.2f%%",
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callchain_avg_cycles(cnode), pct * 100.0);
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if (pair) {
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printf("%35s\t%35s\n", "", buf);
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printf("%35s\t%35s\n",
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"", "--------------------------");
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} else {
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printf("%35s\n", buf);
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printf("%35s\n", "--------------------------");
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}
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list_for_each_entry(chain, &cnode->val, list) {
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s = callchain_list__sym_name(chain, cbuf, sizeof(cbuf), false);
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if (pair)
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scnprintf(buf, sizeof(buf), "%35s\t%35s", "", s);
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else
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scnprintf(buf, sizeof(buf), "%35s", s);
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printf("%s\n", buf);
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}
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}
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static void callchain_streams_report(struct evsel_streams *es_base,
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struct evsel_streams *es_pair)
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{
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struct stream *base_stream;
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int i, idx = 0;
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printf("[ Matched hot streams ]\n");
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for (i = 0; i < es_base->nr_streams; i++) {
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base_stream = &es_base->streams[i];
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if (base_stream->pair_cnode) {
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print_callchain_pair(base_stream, ++idx,
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es_base, es_pair);
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}
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}
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idx = 0;
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printf("\n[ Hot streams in old perf data only ]\n");
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for (i = 0; i < es_base->nr_streams; i++) {
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base_stream = &es_base->streams[i];
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if (!base_stream->pair_cnode) {
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print_stream_callchain(base_stream, ++idx,
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es_base, false);
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}
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}
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idx = 0;
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printf("\n[ Hot streams in new perf data only ]\n");
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for (i = 0; i < es_pair->nr_streams; i++) {
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base_stream = &es_pair->streams[i];
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if (!base_stream->pair_cnode) {
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print_stream_callchain(base_stream, ++idx,
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es_pair, true);
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}
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}
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}
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void evsel_streams__report(struct evsel_streams *es_base,
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struct evsel_streams *es_pair)
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{
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return callchain_streams_report(es_base, es_pair);
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}
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