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