10 * Create new perf.data header attribute:
12 struct perf_header_attr *perf_header_attr__new(struct perf_event_attr *attr)
14 struct perf_header_attr *self = malloc(sizeof(*self));
22 self->id = malloc(sizeof(u64));
30 void perf_header_attr__add_id(struct perf_header_attr *self, u64 id)
35 if (self->ids > self->size) {
37 self->id = realloc(self->id, self->size * sizeof(u64));
45 * Create new perf.data header:
47 struct perf_header *perf_header__new(void)
49 struct perf_header *self = malloc(sizeof(*self));
58 self->attr = malloc(sizeof(void *));
63 self->data_offset = 0;
69 void perf_header__add_attr(struct perf_header *self,
70 struct perf_header_attr *attr)
72 int pos = self->attrs;
78 if (self->attrs > self->size) {
80 self->attr = realloc(self->attr, self->size * sizeof(void *));
84 self->attr[pos] = attr;
87 #define MAX_EVENT_NAME 64
89 struct perf_trace_event_type {
91 char name[MAX_EVENT_NAME];
94 static int event_count;
95 static struct perf_trace_event_type *events;
97 void perf_header__push_event(u64 id, const char *name)
99 if (strlen(name) > MAX_EVENT_NAME)
100 printf("Event %s will be truncated\n", name);
103 events = malloc(sizeof(struct perf_trace_event_type));
107 events = realloc(events, (event_count + 1) * sizeof(struct perf_trace_event_type));
111 memset(&events[event_count], 0, sizeof(struct perf_trace_event_type));
112 events[event_count].event_id = id;
113 strncpy(events[event_count].name, name, MAX_EVENT_NAME - 1);
117 char *perf_header__find_event(u64 id)
120 for (i = 0 ; i < event_count; i++) {
121 if (events[i].event_id == id)
122 return events[i].name;
127 static const char *__perf_magic = "PERFFILE";
129 #define PERF_MAGIC (*(u64 *)__perf_magic)
131 struct perf_file_section {
136 struct perf_file_attr {
137 struct perf_event_attr attr;
138 struct perf_file_section ids;
141 struct perf_file_header {
145 struct perf_file_section attrs;
146 struct perf_file_section data;
147 struct perf_file_section event_types;
150 static void do_write(int fd, void *buf, size_t size)
153 int ret = write(fd, buf, size);
156 die("failed to write");
163 void perf_header__write(struct perf_header *self, int fd)
165 struct perf_file_header f_header;
166 struct perf_file_attr f_attr;
167 struct perf_header_attr *attr;
170 lseek(fd, sizeof(f_header), SEEK_SET);
173 for (i = 0; i < self->attrs; i++) {
174 attr = self->attr[i];
176 attr->id_offset = lseek(fd, 0, SEEK_CUR);
177 do_write(fd, attr->id, attr->ids * sizeof(u64));
181 self->attr_offset = lseek(fd, 0, SEEK_CUR);
183 for (i = 0; i < self->attrs; i++) {
184 attr = self->attr[i];
186 f_attr = (struct perf_file_attr){
189 .offset = attr->id_offset,
190 .size = attr->ids * sizeof(u64),
193 do_write(fd, &f_attr, sizeof(f_attr));
196 self->event_offset = lseek(fd, 0, SEEK_CUR);
197 self->event_size = event_count * sizeof(struct perf_trace_event_type);
199 do_write(fd, events, self->event_size);
202 self->data_offset = lseek(fd, 0, SEEK_CUR);
204 f_header = (struct perf_file_header){
206 .size = sizeof(f_header),
207 .attr_size = sizeof(f_attr),
209 .offset = self->attr_offset,
210 .size = self->attrs * sizeof(f_attr),
213 .offset = self->data_offset,
214 .size = self->data_size,
217 .offset = self->event_offset,
218 .size = self->event_size,
222 lseek(fd, 0, SEEK_SET);
223 do_write(fd, &f_header, sizeof(f_header));
224 lseek(fd, self->data_offset + self->data_size, SEEK_SET);
229 static void do_read(int fd, void *buf, size_t size)
232 int ret = read(fd, buf, size);
235 die("failed to read");
237 die("failed to read: missing data");
244 struct perf_header *perf_header__read(int fd)
246 struct perf_header *self = perf_header__new();
247 struct perf_file_header f_header;
248 struct perf_file_attr f_attr;
251 int nr_attrs, nr_ids, i, j;
253 lseek(fd, 0, SEEK_SET);
254 do_read(fd, &f_header, sizeof(f_header));
256 if (f_header.magic != PERF_MAGIC ||
257 f_header.size != sizeof(f_header) ||
258 f_header.attr_size != sizeof(f_attr))
259 die("incompatible file format");
261 nr_attrs = f_header.attrs.size / sizeof(f_attr);
262 lseek(fd, f_header.attrs.offset, SEEK_SET);
264 for (i = 0; i < nr_attrs; i++) {
265 struct perf_header_attr *attr;
268 do_read(fd, &f_attr, sizeof(f_attr));
269 tmp = lseek(fd, 0, SEEK_CUR);
271 attr = perf_header_attr__new(&f_attr.attr);
273 nr_ids = f_attr.ids.size / sizeof(u64);
274 lseek(fd, f_attr.ids.offset, SEEK_SET);
276 for (j = 0; j < nr_ids; j++) {
277 do_read(fd, &f_id, sizeof(f_id));
279 perf_header_attr__add_id(attr, f_id);
281 perf_header__add_attr(self, attr);
282 lseek(fd, tmp, SEEK_SET);
285 if (f_header.event_types.size) {
286 lseek(fd, f_header.event_types.offset, SEEK_SET);
287 events = malloc(f_header.event_types.size);
290 do_read(fd, events, f_header.event_types.size);
291 event_count = f_header.event_types.size / sizeof(struct perf_trace_event_type);
293 self->event_offset = f_header.event_types.offset;
294 self->event_size = f_header.event_types.size;
296 self->data_offset = f_header.data.offset;
297 self->data_size = f_header.data.size;
299 lseek(fd, self->data_offset, SEEK_SET);
306 u64 perf_header__sample_type(struct perf_header *header)
311 for (i = 0; i < header->attrs; i++) {
312 struct perf_header_attr *attr = header->attr[i];
315 type = attr->attr.sample_type;
316 else if (type != attr->attr.sample_type)
317 die("non matching sample_type");
323 struct perf_event_attr *
324 perf_header__find_attr(u64 id, struct perf_header *header)
328 for (i = 0; i < header->attrs; i++) {
329 struct perf_header_attr *attr = header->attr[i];
332 for (j = 0; j < attr->ids; j++) {
333 if (attr->id[j] == id)