Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#include "../perf.h"
2#include <stdlib.h>
3#include <stdio.h>
4#include <string.h>
5#include "session.h"
6#include "thread.h"
7#include "util.h"
8#include "debug.h"
9#include "comm.h"
10
11int thread__init_map_groups(struct thread *thread, struct machine *machine)
12{
13 struct thread *leader;
14 pid_t pid = thread->pid_;
15
16 if (pid == thread->tid || pid == -1) {
17 thread->mg = map_groups__new();
18 } else {
19 leader = machine__findnew_thread(machine, pid, pid);
20 if (leader)
21 thread->mg = map_groups__get(leader->mg);
22 }
23
24 return thread->mg ? 0 : -1;
25}
26
27struct thread *thread__new(pid_t pid, pid_t tid)
28{
29 char *comm_str;
30 struct comm *comm;
31 struct thread *thread = zalloc(sizeof(*thread));
32
33 if (thread != NULL) {
34 thread->pid_ = pid;
35 thread->tid = tid;
36 thread->ppid = -1;
37 thread->cpu = -1;
38 INIT_LIST_HEAD(&thread->comm_list);
39
40 comm_str = malloc(32);
41 if (!comm_str)
42 goto err_thread;
43
44 snprintf(comm_str, 32, ":%d", tid);
45 comm = comm__new(comm_str, 0);
46 free(comm_str);
47 if (!comm)
48 goto err_thread;
49
50 list_add(&comm->list, &thread->comm_list);
51 }
52
53 return thread;
54
55err_thread:
56 free(thread);
57 return NULL;
58}
59
60void thread__delete(struct thread *thread)
61{
62 struct comm *comm, *tmp;
63
64 if (thread->mg) {
65 map_groups__put(thread->mg);
66 thread->mg = NULL;
67 }
68 list_for_each_entry_safe(comm, tmp, &thread->comm_list, list) {
69 list_del(&comm->list);
70 comm__free(comm);
71 }
72
73 free(thread);
74}
75
76struct comm *thread__comm(const struct thread *thread)
77{
78 if (list_empty(&thread->comm_list))
79 return NULL;
80
81 return list_first_entry(&thread->comm_list, struct comm, list);
82}
83
84/* CHECKME: time should always be 0 if event aren't ordered */
85int thread__set_comm(struct thread *thread, const char *str, u64 timestamp)
86{
87 struct comm *new, *curr = thread__comm(thread);
88 int err;
89
90 /* Override latest entry if it had no specific time coverage */
91 if (!curr->start) {
92 err = comm__override(curr, str, timestamp);
93 if (err)
94 return err;
95 } else {
96 new = comm__new(str, timestamp);
97 if (!new)
98 return -ENOMEM;
99 list_add(&new->list, &thread->comm_list);
100 }
101
102 thread->comm_set = true;
103
104 return 0;
105}
106
107const char *thread__comm_str(const struct thread *thread)
108{
109 const struct comm *comm = thread__comm(thread);
110
111 if (!comm)
112 return NULL;
113
114 return comm__str(comm);
115}
116
117/* CHECKME: it should probably better return the max comm len from its comm list */
118int thread__comm_len(struct thread *thread)
119{
120 if (!thread->comm_len) {
121 const char *comm = thread__comm_str(thread);
122 if (!comm)
123 return 0;
124 thread->comm_len = strlen(comm);
125 }
126
127 return thread->comm_len;
128}
129
130size_t thread__fprintf(struct thread *thread, FILE *fp)
131{
132 return fprintf(fp, "Thread %d %s\n", thread->tid, thread__comm_str(thread)) +
133 map_groups__fprintf(thread->mg, fp);
134}
135
136void thread__insert_map(struct thread *thread, struct map *map)
137{
138 map_groups__fixup_overlappings(thread->mg, map, stderr);
139 map_groups__insert(thread->mg, map);
140}
141
142static int thread__clone_map_groups(struct thread *thread,
143 struct thread *parent)
144{
145 int i;
146
147 /* This is new thread, we share map groups for process. */
148 if (thread->pid_ == parent->pid_)
149 return 0;
150
151 /* But this one is new process, copy maps. */
152 for (i = 0; i < MAP__NR_TYPES; ++i)
153 if (map_groups__clone(thread->mg, parent->mg, i) < 0)
154 return -ENOMEM;
155
156 return 0;
157}
158
159int thread__fork(struct thread *thread, struct thread *parent, u64 timestamp)
160{
161 int err;
162
163 if (parent->comm_set) {
164 const char *comm = thread__comm_str(parent);
165 if (!comm)
166 return -ENOMEM;
167 err = thread__set_comm(thread, comm, timestamp);
168 if (err)
169 return err;
170 thread->comm_set = true;
171 }
172
173 thread->ppid = parent->tid;
174 return thread__clone_map_groups(thread, parent);
175}
176
177void thread__find_cpumode_addr_location(struct thread *thread,
178 struct machine *machine,
179 enum map_type type, u64 addr,
180 struct addr_location *al)
181{
182 size_t i;
183 const u8 const cpumodes[] = {
184 PERF_RECORD_MISC_USER,
185 PERF_RECORD_MISC_KERNEL,
186 PERF_RECORD_MISC_GUEST_USER,
187 PERF_RECORD_MISC_GUEST_KERNEL
188 };
189
190 for (i = 0; i < ARRAY_SIZE(cpumodes); i++) {
191 thread__find_addr_location(thread, machine, cpumodes[i], type,
192 addr, al);
193 if (al->map)
194 break;
195 }
196}