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Linux/tools/perf/util/thread.c

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  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 "thread-stack.h"
  8 #include "util.h"
  9 #include "debug.h"
 10 #include "comm.h"
 11 #include "unwind.h"
 12 
 13 int thread__init_map_groups(struct thread *thread, struct machine *machine)
 14 {
 15         struct thread *leader;
 16         pid_t pid = thread->pid_;
 17 
 18         if (pid == thread->tid || pid == -1) {
 19                 thread->mg = map_groups__new(machine);
 20         } else {
 21                 leader = machine__findnew_thread(machine, pid, pid);
 22                 if (leader)
 23                         thread->mg = map_groups__get(leader->mg);
 24         }
 25 
 26         return thread->mg ? 0 : -1;
 27 }
 28 
 29 struct thread *thread__new(pid_t pid, pid_t tid)
 30 {
 31         char *comm_str;
 32         struct comm *comm;
 33         struct thread *thread = zalloc(sizeof(*thread));
 34 
 35         if (thread != NULL) {
 36                 thread->pid_ = pid;
 37                 thread->tid = tid;
 38                 thread->ppid = -1;
 39                 thread->cpu = -1;
 40                 INIT_LIST_HEAD(&thread->comm_list);
 41 
 42                 if (unwind__prepare_access(thread) < 0)
 43                         goto err_thread;
 44 
 45                 comm_str = malloc(32);
 46                 if (!comm_str)
 47                         goto err_thread;
 48 
 49                 snprintf(comm_str, 32, ":%d", tid);
 50                 comm = comm__new(comm_str, 0, false);
 51                 free(comm_str);
 52                 if (!comm)
 53                         goto err_thread;
 54 
 55                 list_add(&comm->list, &thread->comm_list);
 56 
 57         }
 58 
 59         return thread;
 60 
 61 err_thread:
 62         free(thread);
 63         return NULL;
 64 }
 65 
 66 void thread__delete(struct thread *thread)
 67 {
 68         struct comm *comm, *tmp;
 69 
 70         thread_stack__free(thread);
 71 
 72         if (thread->mg) {
 73                 map_groups__put(thread->mg);
 74                 thread->mg = NULL;
 75         }
 76         list_for_each_entry_safe(comm, tmp, &thread->comm_list, list) {
 77                 list_del(&comm->list);
 78                 comm__free(comm);
 79         }
 80         unwind__finish_access(thread);
 81 
 82         free(thread);
 83 }
 84 
 85 struct comm *thread__comm(const struct thread *thread)
 86 {
 87         if (list_empty(&thread->comm_list))
 88                 return NULL;
 89 
 90         return list_first_entry(&thread->comm_list, struct comm, list);
 91 }
 92 
 93 struct comm *thread__exec_comm(const struct thread *thread)
 94 {
 95         struct comm *comm, *last = NULL;
 96 
 97         list_for_each_entry(comm, &thread->comm_list, list) {
 98                 if (comm->exec)
 99                         return comm;
100                 last = comm;
101         }
102 
103         return last;
104 }
105 
106 int __thread__set_comm(struct thread *thread, const char *str, u64 timestamp,
107                        bool exec)
108 {
109         struct comm *new, *curr = thread__comm(thread);
110         int err;
111 
112         /* Override the default :tid entry */
113         if (!thread->comm_set) {
114                 err = comm__override(curr, str, timestamp, exec);
115                 if (err)
116                         return err;
117         } else {
118                 new = comm__new(str, timestamp, exec);
119                 if (!new)
120                         return -ENOMEM;
121                 list_add(&new->list, &thread->comm_list);
122 
123                 if (exec)
124                         unwind__flush_access(thread);
125         }
126 
127         thread->comm_set = true;
128 
129         return 0;
130 }
131 
132 const char *thread__comm_str(const struct thread *thread)
133 {
134         const struct comm *comm = thread__comm(thread);
135 
136         if (!comm)
137                 return NULL;
138 
139         return comm__str(comm);
140 }
141 
142 /* CHECKME: it should probably better return the max comm len from its comm list */
143 int thread__comm_len(struct thread *thread)
144 {
145         if (!thread->comm_len) {
146                 const char *comm = thread__comm_str(thread);
147                 if (!comm)
148                         return 0;
149                 thread->comm_len = strlen(comm);
150         }
151 
152         return thread->comm_len;
153 }
154 
155 size_t thread__fprintf(struct thread *thread, FILE *fp)
156 {
157         return fprintf(fp, "Thread %d %s\n", thread->tid, thread__comm_str(thread)) +
158                map_groups__fprintf(thread->mg, fp);
159 }
160 
161 void thread__insert_map(struct thread *thread, struct map *map)
162 {
163         map_groups__fixup_overlappings(thread->mg, map, stderr);
164         map_groups__insert(thread->mg, map);
165 }
166 
167 static int thread__clone_map_groups(struct thread *thread,
168                                     struct thread *parent)
169 {
170         int i;
171 
172         /* This is new thread, we share map groups for process. */
173         if (thread->pid_ == parent->pid_)
174                 return 0;
175 
176         /* But this one is new process, copy maps. */
177         for (i = 0; i < MAP__NR_TYPES; ++i)
178                 if (map_groups__clone(thread->mg, parent->mg, i) < 0)
179                         return -ENOMEM;
180 
181         return 0;
182 }
183 
184 int thread__fork(struct thread *thread, struct thread *parent, u64 timestamp)
185 {
186         int err;
187 
188         if (parent->comm_set) {
189                 const char *comm = thread__comm_str(parent);
190                 if (!comm)
191                         return -ENOMEM;
192                 err = thread__set_comm(thread, comm, timestamp);
193                 if (err)
194                         return err;
195                 thread->comm_set = true;
196         }
197 
198         thread->ppid = parent->tid;
199         return thread__clone_map_groups(thread, parent);
200 }
201 
202 void thread__find_cpumode_addr_location(struct thread *thread,
203                                         enum map_type type, u64 addr,
204                                         struct addr_location *al)
205 {
206         size_t i;
207         const u8 const cpumodes[] = {
208                 PERF_RECORD_MISC_USER,
209                 PERF_RECORD_MISC_KERNEL,
210                 PERF_RECORD_MISC_GUEST_USER,
211                 PERF_RECORD_MISC_GUEST_KERNEL
212         };
213 
214         for (i = 0; i < ARRAY_SIZE(cpumodes); i++) {
215                 thread__find_addr_location(thread, cpumodes[i], type, addr, al);
216                 if (al->map)
217                         break;
218         }
219 }
220 

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