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// SPDX-License-Identifier: GPL-2.0
/*
* Compare and figure out the top N hottest streams
* Copyright (c) 2020, Intel Corporation.
* Author: Jin Yao
*/
#include <inttypes.h>
#include <stdlib.h>
#include <linux/zalloc.h>
#include "debug.h"
#include "hist.h"
#include "sort.h"
#include "stream.h"
#include "evlist.h"
static void evsel_streams__delete(struct evsel_streams *es, int nr_evsel)
{
for (int i = 0; i < nr_evsel; i++)
zfree(&es[i].streams);
free(es);
}
void evlist_streams__delete(struct evlist_streams *els)
{
evsel_streams__delete(els->ev_streams, els->nr_evsel);
free(els);
}
static struct evlist_streams *evlist_streams__new(int nr_evsel,
int nr_streams_max)
{
struct evlist_streams *els;
struct evsel_streams *es;
els = zalloc(sizeof(*els));
if (!els)
return NULL;
es = calloc(nr_evsel, sizeof(struct evsel_streams));
if (!es) {
free(els);
return NULL;
}
for (int i = 0; i < nr_evsel; i++) {
struct evsel_streams *s = &es[i];
s->streams = calloc(nr_streams_max, sizeof(struct stream));
if (!s->streams)
goto err;
s->nr_streams_max = nr_streams_max;
s->evsel_idx = -1;
}
els->ev_streams = es;
els->nr_evsel = nr_evsel;
return els;
err:
evsel_streams__delete(es, nr_evsel);
return NULL;
}
/*
* The cnodes with high hit number are hot callchains.
*/
static void evsel_streams__set_hot_cnode(struct evsel_streams *es,
struct callchain_node *cnode)
{
int i, idx = 0;
u64 hit;
if (es->nr_streams < es->nr_streams_max) {
i = es->nr_streams;
es->streams[i].cnode = cnode;
es->nr_streams++;
return;
}
/*
* Considering a few number of hot streams, only use simple
* way to find the cnode with smallest hit number and replace.
*/
hit = (es->streams[0].cnode)->hit;
for (i = 1; i < es->nr_streams; i++) {
if ((es->streams[i].cnode)->hit < hit) {
hit = (es->streams[i].cnode)->hit;
idx = i;
}
}
if (cnode->hit > hit)
es->streams[idx].cnode = cnode;
}
static void update_hot_callchain(struct hist_entry *he,
struct evsel_streams *es)
{
struct rb_root *root = &he->sorted_chain;
struct rb_node *rb_node = rb_first(root);
struct callchain_node *cnode;
while (rb_node) {
cnode = rb_entry(rb_node, struct callchain_node, rb_node);
evsel_streams__set_hot_cnode(es, cnode);
rb_node = rb_next(rb_node);
}
}
static void init_hot_callchain(struct hists *hists, struct evsel_streams *es)
{
struct rb_node *next = rb_first_cached(&hists->entries);
while (next) {
struct hist_entry *he;
he = rb_entry(next, struct hist_entry, rb_node);
update_hot_callchain(he, es);
next = rb_next(&he->rb_node);
}
}
static int evlist__init_callchain_streams(struct evlist *evlist,
struct evlist_streams *els)
{
struct evsel_streams *es = els->ev_streams;
struct evsel *pos;
int i = 0;
BUG_ON(els->nr_evsel < evlist->core.nr_entries);
evlist__for_each_entry(evlist, pos) {
struct hists *hists = evsel__hists(pos);
hists__output_resort(hists, NULL);
init_hot_callchain(hists, &es[i]);
es[i].evsel_idx = pos->idx;
i++;
}
return 0;
}
struct evlist_streams *evlist__create_streams(struct evlist *evlist,
int nr_streams_max)
{
int nr_evsel = evlist->core.nr_entries, ret = -1;
struct evlist_streams *els = evlist_streams__new(nr_evsel,
nr_streams_max);
if (!els)
return NULL;
ret = evlist__init_callchain_streams(evlist, els);
if (ret) {
evlist_streams__delete(els);
return NULL;
}
return els;
}
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