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#include "../perf.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "thread.h"
#include "util.h"
#include "debug.h"
static struct rb_root threads;
static struct thread *last_match;
static struct thread *thread__new(pid_t pid)
{
struct thread *self = calloc(1, sizeof(*self));
if (self != NULL) {
self->pid = pid;
self->comm = malloc(32);
if (self->comm)
snprintf(self->comm, 32, ":%d", self->pid);
self->maps = RB_ROOT;
INIT_LIST_HEAD(&self->removed_maps);
}
return self;
}
int thread__set_comm(struct thread *self, const char *comm)
{
if (self->comm)
free(self->comm);
self->comm = strdup(comm);
return self->comm ? 0 : -ENOMEM;
}
static size_t thread__fprintf(struct thread *self, FILE *fp)
{
struct rb_node *nd;
struct map *pos;
size_t ret = fprintf(fp, "Thread %d %s\nCurrent maps:\n",
self->pid, self->comm);
for (nd = rb_first(&self->maps); nd; nd = rb_next(nd)) {
pos = rb_entry(nd, struct map, rb_node);
ret += map__fprintf(pos, fp);
}
ret = fprintf(fp, "Removed maps:\n");
list_for_each_entry(pos, &self->removed_maps, node)
ret += map__fprintf(pos, fp);
return ret;
}
struct thread *threads__findnew(pid_t pid)
{
struct rb_node **p = &threads.rb_node;
struct rb_node *parent = NULL;
struct thread *th;
/*
* Font-end cache - PID lookups come in blocks,
* so most of the time we dont have to look up
* the full rbtree:
*/
if (last_match && last_match->pid == pid)
return last_match;
while (*p != NULL) {
parent = *p;
th = rb_entry(parent, struct thread, rb_node);
if (th->pid == pid) {
last_match = th;
return th;
}
if (pid < th->pid)
p = &(*p)->rb_left;
else
p = &(*p)->rb_right;
}
th = thread__new(pid);
if (th != NULL) {
rb_link_node(&th->rb_node, parent, p);
rb_insert_color(&th->rb_node, &threads);
last_match = th;
}
return th;
}
struct thread *register_idle_thread(void)
{
struct thread *thread = threads__findnew(0);
if (!thread || thread__set_comm(thread, "swapper")) {
fprintf(stderr, "problem inserting idle task.\n");
exit(-1);
}
return thread;
}
static void thread__remove_overlappings(struct thread *self, struct map *map)
{
struct rb_node *next = rb_first(&self->maps);
while (next) {
struct map *pos = rb_entry(next, struct map, rb_node);
next = rb_next(&pos->rb_node);
if (!map__overlap(pos, map))
continue;
if (verbose >= 2) {
printf("overlapping maps:\n");
map__fprintf(map, stdout);
map__fprintf(pos, stdout);
}
rb_erase(&pos->rb_node, &self->maps);
/*
* We may have references to this map, for instance in some
* hist_entry instances, so just move them to a separate
* list.
*/
list_add_tail(&pos->node, &self->removed_maps);
}
}
void maps__insert(struct rb_root *maps, struct map *map)
{
struct rb_node **p = &maps->rb_node;
struct rb_node *parent = NULL;
const u64 ip = map->start;
struct map *m;
while (*p != NULL) {
parent = *p;
m = rb_entry(parent, struct map, rb_node);
if (ip < m->start)
p = &(*p)->rb_left;
else
p = &(*p)->rb_right;
}
rb_link_node(&map->rb_node, parent, p);
rb_insert_color(&map->rb_node, maps);
}
struct map *maps__find(struct rb_root *maps, u64 ip)
{
struct rb_node **p = &maps->rb_node;
struct rb_node *parent = NULL;
struct map *m;
while (*p != NULL) {
parent = *p;
m = rb_entry(parent, struct map, rb_node);
if (ip < m->start)
p = &(*p)->rb_left;
else if (ip > m->end)
p = &(*p)->rb_right;
else
return m;
}
return NULL;
}
void thread__insert_map(struct thread *self, struct map *map)
{
thread__remove_overlappings(self, map);
maps__insert(&self->maps, map);
}
int thread__fork(struct thread *self, struct thread *parent)
{
struct rb_node *nd;
if (self->comm)
free(self->comm);
self->comm = strdup(parent->comm);
if (!self->comm)
return -ENOMEM;
for (nd = rb_first(&parent->maps); nd; nd = rb_next(nd)) {
struct map *map = rb_entry(nd, struct map, rb_node);
struct map *new = map__clone(map);
if (!new)
return -ENOMEM;
thread__insert_map(self, new);
}
return 0;
}
size_t threads__fprintf(FILE *fp)
{
size_t ret = 0;
struct rb_node *nd;
for (nd = rb_first(&threads); nd; nd = rb_next(nd)) {
struct thread *pos = rb_entry(nd, struct thread, rb_node);
ret += thread__fprintf(pos, fp);
}
return ret;
}
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