1 #define _FILE_OFFSET_BITS 64
9 #include <linux/list.h>
10 #include <linux/kernel.h>
11 #include <sys/utsname.h>
17 #include "trace-event.h"
23 static bool no_buildid_cache = false;
25 static int event_count;
26 static struct perf_trace_event_type *events;
28 static u32 header_argc;
29 static const char **header_argv;
31 static int dsos__write_buildid_table(struct perf_header *header, int fd);
32 static int perf_session__cache_build_ids(struct perf_session *session);
34 int perf_header__push_event(u64 id, const char *name)
36 if (strlen(name) > MAX_EVENT_NAME)
37 pr_warning("Event %s will be truncated\n", name);
40 events = malloc(sizeof(struct perf_trace_event_type));
44 struct perf_trace_event_type *nevents;
46 nevents = realloc(events, (event_count + 1) * sizeof(*events));
51 memset(&events[event_count], 0, sizeof(struct perf_trace_event_type));
52 events[event_count].event_id = id;
53 strncpy(events[event_count].name, name, MAX_EVENT_NAME - 1);
58 char *perf_header__find_event(u64 id)
61 for (i = 0 ; i < event_count; i++) {
62 if (events[i].event_id == id)
63 return events[i].name;
68 static const char *__perf_magic = "PERFFILE";
70 #define PERF_MAGIC (*(u64 *)__perf_magic)
72 struct perf_file_attr {
73 struct perf_event_attr attr;
74 struct perf_file_section ids;
77 void perf_header__set_feat(struct perf_header *header, int feat)
79 set_bit(feat, header->adds_features);
82 void perf_header__clear_feat(struct perf_header *header, int feat)
84 clear_bit(feat, header->adds_features);
87 bool perf_header__has_feat(const struct perf_header *header, int feat)
89 return test_bit(feat, header->adds_features);
92 static int do_write(int fd, const void *buf, size_t size)
95 int ret = write(fd, buf, size);
107 #define NAME_ALIGN 64
109 static int write_padded(int fd, const void *bf, size_t count,
110 size_t count_aligned)
112 static const char zero_buf[NAME_ALIGN];
113 int err = do_write(fd, bf, count);
116 err = do_write(fd, zero_buf, count_aligned - count);
121 static int do_write_string(int fd, const char *str)
126 olen = strlen(str) + 1;
127 len = ALIGN(olen, NAME_ALIGN);
129 /* write len, incl. \0 */
130 ret = do_write(fd, &len, sizeof(len));
134 return write_padded(fd, str, olen, len);
137 static char *do_read_string(int fd, struct perf_header *ph)
143 sz = read(fd, &len, sizeof(len));
144 if (sz < (ssize_t)sizeof(len))
154 ret = read(fd, buf, len);
155 if (ret == (ssize_t)len) {
157 * strings are padded by zeroes
158 * thus the actual strlen of buf
159 * may be less than len
169 perf_header__set_cmdline(int argc, const char **argv)
173 header_argc = (u32)argc;
175 /* do not include NULL termination */
176 header_argv = calloc(argc, sizeof(char *));
181 * must copy argv contents because it gets moved
182 * around during option parsing
184 for (i = 0; i < argc ; i++)
185 header_argv[i] = argv[i];
190 static int write_trace_info(int fd, struct perf_header *h __used,
191 struct perf_evlist *evlist)
193 return read_tracing_data(fd, &evlist->entries);
197 static int write_build_id(int fd, struct perf_header *h,
198 struct perf_evlist *evlist __used)
200 struct perf_session *session;
203 session = container_of(h, struct perf_session, header);
205 err = dsos__write_buildid_table(h, fd);
207 pr_debug("failed to write buildid table\n");
210 if (!no_buildid_cache)
211 perf_session__cache_build_ids(session);
216 static int write_hostname(int fd, struct perf_header *h __used,
217 struct perf_evlist *evlist __used)
226 return do_write_string(fd, uts.nodename);
229 static int write_osrelease(int fd, struct perf_header *h __used,
230 struct perf_evlist *evlist __used)
239 return do_write_string(fd, uts.release);
242 static int write_arch(int fd, struct perf_header *h __used,
243 struct perf_evlist *evlist __used)
252 return do_write_string(fd, uts.machine);
255 static int write_version(int fd, struct perf_header *h __used,
256 struct perf_evlist *evlist __used)
258 return do_write_string(fd, perf_version_string);
261 static int write_cpudesc(int fd, struct perf_header *h __used,
262 struct perf_evlist *evlist __used)
265 #define CPUINFO_PROC NULL
270 const char *search = CPUINFO_PROC;
277 file = fopen("/proc/cpuinfo", "r");
281 while (getline(&buf, &len, file) > 0) {
282 ret = strncmp(buf, search, strlen(search));
292 p = strchr(buf, ':');
293 if (p && *(p+1) == ' ' && *(p+2))
299 /* squash extra space characters (branding string) */
306 while (*q && isspace(*q))
309 while ((*r++ = *q++));
313 ret = do_write_string(fd, s);
320 static int write_nrcpus(int fd, struct perf_header *h __used,
321 struct perf_evlist *evlist __used)
327 nr = sysconf(_SC_NPROCESSORS_CONF);
331 nrc = (u32)(nr & UINT_MAX);
333 nr = sysconf(_SC_NPROCESSORS_ONLN);
337 nra = (u32)(nr & UINT_MAX);
339 ret = do_write(fd, &nrc, sizeof(nrc));
343 return do_write(fd, &nra, sizeof(nra));
346 static int write_event_desc(int fd, struct perf_header *h __used,
347 struct perf_evlist *evlist)
349 struct perf_evsel *attr;
350 u32 nre = 0, nri, sz;
353 list_for_each_entry(attr, &evlist->entries, node)
357 * write number of events
359 ret = do_write(fd, &nre, sizeof(nre));
364 * size of perf_event_attr struct
366 sz = (u32)sizeof(attr->attr);
367 ret = do_write(fd, &sz, sizeof(sz));
371 list_for_each_entry(attr, &evlist->entries, node) {
373 ret = do_write(fd, &attr->attr, sz);
377 * write number of unique id per event
378 * there is one id per instance of an event
380 * copy into an nri to be independent of the
384 ret = do_write(fd, &nri, sizeof(nri));
389 * write event string as passed on cmdline
391 ret = do_write_string(fd, event_name(attr));
395 * write unique ids for this event
397 ret = do_write(fd, attr->id, attr->ids * sizeof(u64));
404 static int write_cmdline(int fd, struct perf_header *h __used,
405 struct perf_evlist *evlist __used)
407 char buf[MAXPATHLEN];
413 * actual atual path to perf binary
415 sprintf(proc, "/proc/%d/exe", getpid());
416 ret = readlink(proc, buf, sizeof(buf));
420 /* readlink() does not add null termination */
423 /* account for binary path */
426 ret = do_write(fd, &n, sizeof(n));
430 ret = do_write_string(fd, buf);
434 for (i = 0 ; i < header_argc; i++) {
435 ret = do_write_string(fd, header_argv[i]);
442 #define CORE_SIB_FMT \
443 "/sys/devices/system/cpu/cpu%d/topology/core_siblings_list"
444 #define THRD_SIB_FMT \
445 "/sys/devices/system/cpu/cpu%d/topology/thread_siblings_list"
450 char **core_siblings;
451 char **thread_siblings;
454 static int build_cpu_topo(struct cpu_topo *tp, int cpu)
457 char filename[MAXPATHLEN];
458 char *buf = NULL, *p;
463 sprintf(filename, CORE_SIB_FMT, cpu);
464 fp = fopen(filename, "r");
468 if (getline(&buf, &len, fp) <= 0)
473 p = strchr(buf, '\n');
477 for (i = 0; i < tp->core_sib; i++) {
478 if (!strcmp(buf, tp->core_siblings[i]))
481 if (i == tp->core_sib) {
482 tp->core_siblings[i] = buf;
488 sprintf(filename, THRD_SIB_FMT, cpu);
489 fp = fopen(filename, "r");
493 if (getline(&buf, &len, fp) <= 0)
496 p = strchr(buf, '\n');
500 for (i = 0; i < tp->thread_sib; i++) {
501 if (!strcmp(buf, tp->thread_siblings[i]))
504 if (i == tp->thread_sib) {
505 tp->thread_siblings[i] = buf;
517 static void free_cpu_topo(struct cpu_topo *tp)
524 for (i = 0 ; i < tp->core_sib; i++)
525 free(tp->core_siblings[i]);
527 for (i = 0 ; i < tp->thread_sib; i++)
528 free(tp->thread_siblings[i]);
533 static struct cpu_topo *build_cpu_topology(void)
542 ncpus = sysconf(_SC_NPROCESSORS_CONF);
546 nr = (u32)(ncpus & UINT_MAX);
548 sz = nr * sizeof(char *);
550 addr = calloc(1, sizeof(*tp) + 2 * sz);
557 tp->core_siblings = addr;
559 tp->thread_siblings = addr;
561 for (i = 0; i < nr; i++) {
562 ret = build_cpu_topo(tp, i);
573 static int write_cpu_topology(int fd, struct perf_header *h __used,
574 struct perf_evlist *evlist __used)
580 tp = build_cpu_topology();
584 ret = do_write(fd, &tp->core_sib, sizeof(tp->core_sib));
588 for (i = 0; i < tp->core_sib; i++) {
589 ret = do_write_string(fd, tp->core_siblings[i]);
593 ret = do_write(fd, &tp->thread_sib, sizeof(tp->thread_sib));
597 for (i = 0; i < tp->thread_sib; i++) {
598 ret = do_write_string(fd, tp->thread_siblings[i]);
609 static int write_total_mem(int fd, struct perf_header *h __used,
610 struct perf_evlist *evlist __used)
618 fp = fopen("/proc/meminfo", "r");
622 while (getline(&buf, &len, fp) > 0) {
623 ret = strncmp(buf, "MemTotal:", 9);
628 n = sscanf(buf, "%*s %"PRIu64, &mem);
630 ret = do_write(fd, &mem, sizeof(mem));
637 static int write_topo_node(int fd, int node)
639 char str[MAXPATHLEN];
641 char *buf = NULL, *p;
644 u64 mem_total, mem_free, mem;
647 sprintf(str, "/sys/devices/system/node/node%d/meminfo", node);
648 fp = fopen(str, "r");
652 while (getline(&buf, &len, fp) > 0) {
653 /* skip over invalid lines */
654 if (!strchr(buf, ':'))
656 if (sscanf(buf, "%*s %*d %s %"PRIu64, field, &mem) != 2)
658 if (!strcmp(field, "MemTotal:"))
660 if (!strcmp(field, "MemFree:"))
666 ret = do_write(fd, &mem_total, sizeof(u64));
670 ret = do_write(fd, &mem_free, sizeof(u64));
675 sprintf(str, "/sys/devices/system/node/node%d/cpulist", node);
677 fp = fopen(str, "r");
681 if (getline(&buf, &len, fp) <= 0)
684 p = strchr(buf, '\n');
688 ret = do_write_string(fd, buf);
695 static int write_numa_topology(int fd, struct perf_header *h __used,
696 struct perf_evlist *evlist __used)
701 struct cpu_map *node_map = NULL;
706 fp = fopen("/sys/devices/system/node/online", "r");
710 if (getline(&buf, &len, fp) <= 0)
713 c = strchr(buf, '\n');
717 node_map = cpu_map__new(buf);
721 nr = (u32)node_map->nr;
723 ret = do_write(fd, &nr, sizeof(nr));
727 for (i = 0; i < nr; i++) {
728 j = (u32)node_map->map[i];
729 ret = do_write(fd, &j, sizeof(j));
733 ret = write_topo_node(fd, i);
745 * default get_cpuid(): nothing gets recorded
746 * actual implementation must be in arch/$(ARCH)/util/header.c
748 int __attribute__((weak)) get_cpuid(char *buffer __used, size_t sz __used)
753 static int write_cpuid(int fd, struct perf_header *h __used,
754 struct perf_evlist *evlist __used)
759 ret = get_cpuid(buffer, sizeof(buffer));
765 return do_write_string(fd, buffer);
768 static void print_hostname(struct perf_header *ph, int fd, FILE *fp)
770 char *str = do_read_string(fd, ph);
771 fprintf(fp, "# hostname : %s\n", str);
775 static void print_osrelease(struct perf_header *ph, int fd, FILE *fp)
777 char *str = do_read_string(fd, ph);
778 fprintf(fp, "# os release : %s\n", str);
782 static void print_arch(struct perf_header *ph, int fd, FILE *fp)
784 char *str = do_read_string(fd, ph);
785 fprintf(fp, "# arch : %s\n", str);
789 static void print_cpudesc(struct perf_header *ph, int fd, FILE *fp)
791 char *str = do_read_string(fd, ph);
792 fprintf(fp, "# cpudesc : %s\n", str);
796 static void print_nrcpus(struct perf_header *ph, int fd, FILE *fp)
801 ret = read(fd, &nr, sizeof(nr));
802 if (ret != (ssize_t)sizeof(nr))
803 nr[0] = nr[1] = -1; /* interpreted as error */
805 if (ph->needs_swap) {
806 nr[0] = bswap_32(nr[0]);
807 nr[1] = bswap_32(nr[1]);
810 fprintf(fp, "# nrcpus online : %u\n", nr[1]);
811 fprintf(fp, "# nrcpus avail : %u\n", nr[0]);
814 static void print_version(struct perf_header *ph, int fd, FILE *fp)
816 char *str = do_read_string(fd, ph);
817 fprintf(fp, "# perf version : %s\n", str);
821 static void print_cmdline(struct perf_header *ph, int fd, FILE *fp)
827 ret = read(fd, &nr, sizeof(nr));
828 if (ret != (ssize_t)sizeof(nr))
834 fprintf(fp, "# cmdline : ");
836 for (i = 0; i < nr; i++) {
837 str = do_read_string(fd, ph);
838 fprintf(fp, "%s ", str);
844 static void print_cpu_topology(struct perf_header *ph, int fd, FILE *fp)
850 ret = read(fd, &nr, sizeof(nr));
851 if (ret != (ssize_t)sizeof(nr))
857 for (i = 0; i < nr; i++) {
858 str = do_read_string(fd, ph);
859 fprintf(fp, "# sibling cores : %s\n", str);
863 ret = read(fd, &nr, sizeof(nr));
864 if (ret != (ssize_t)sizeof(nr))
870 for (i = 0; i < nr; i++) {
871 str = do_read_string(fd, ph);
872 fprintf(fp, "# sibling threads : %s\n", str);
877 static void print_event_desc(struct perf_header *ph, int fd, FILE *fp)
879 struct perf_event_attr attr;
883 u32 nre, sz, nr, i, j, msz;
886 /* number of events */
887 ret = read(fd, &nre, sizeof(nre));
888 if (ret != (ssize_t)sizeof(nre))
894 ret = read(fd, &sz, sizeof(sz));
895 if (ret != (ssize_t)sizeof(sz))
902 * ensure it is at least to our ABI rev
904 if (sz < (u32)sizeof(attr))
907 memset(&attr, 0, sizeof(attr));
909 /* read entire region to sync up to next field */
918 for (i = 0 ; i < nre; i++) {
920 ret = read(fd, buf, sz);
921 if (ret != (ssize_t)sz)
925 perf_event__attr_swap(buf);
927 memcpy(&attr, buf, msz);
929 ret = read(fd, &nr, sizeof(nr));
930 if (ret != (ssize_t)sizeof(nr))
936 str = do_read_string(fd, ph);
937 fprintf(fp, "# event : name = %s, ", str);
940 fprintf(fp, "type = %d, config = 0x%"PRIx64
941 ", config1 = 0x%"PRIx64", config2 = 0x%"PRIx64,
947 fprintf(fp, ", excl_usr = %d, excl_kern = %d",
949 attr.exclude_kernel);
952 fprintf(fp, ", id = {");
954 for (j = 0 ; j < nr; j++) {
955 ret = read(fd, &id, sizeof(id));
956 if (ret != (ssize_t)sizeof(id))
965 fprintf(fp, " %"PRIu64, id);
974 fprintf(fp, "# event desc: not available or unable to read\n");
977 static void print_total_mem(struct perf_header *h __used, int fd, FILE *fp)
982 ret = read(fd, &mem, sizeof(mem));
983 if (ret != sizeof(mem))
989 fprintf(fp, "# total memory : %"PRIu64" kB\n", mem);
992 fprintf(fp, "# total memory : unknown\n");
995 static void print_numa_topology(struct perf_header *h __used, int fd, FILE *fp)
1000 uint64_t mem_total, mem_free;
1003 ret = read(fd, &nr, sizeof(nr));
1004 if (ret != (ssize_t)sizeof(nr))
1010 for (i = 0; i < nr; i++) {
1013 ret = read(fd, &c, sizeof(c));
1014 if (ret != (ssize_t)sizeof(c))
1020 ret = read(fd, &mem_total, sizeof(u64));
1021 if (ret != sizeof(u64))
1024 ret = read(fd, &mem_free, sizeof(u64));
1025 if (ret != sizeof(u64))
1028 if (h->needs_swap) {
1029 mem_total = bswap_64(mem_total);
1030 mem_free = bswap_64(mem_free);
1033 fprintf(fp, "# node%u meminfo : total = %"PRIu64" kB,"
1034 " free = %"PRIu64" kB\n",
1039 str = do_read_string(fd, h);
1040 fprintf(fp, "# node%u cpu list : %s\n", c, str);
1045 fprintf(fp, "# numa topology : not available\n");
1048 static void print_cpuid(struct perf_header *ph, int fd, FILE *fp)
1050 char *str = do_read_string(fd, ph);
1051 fprintf(fp, "# cpuid : %s\n", str);
1055 struct feature_ops {
1056 int (*write)(int fd, struct perf_header *h, struct perf_evlist *evlist);
1057 void (*print)(struct perf_header *h, int fd, FILE *fp);
1062 #define FEAT_OPA(n, w, p) \
1063 [n] = { .name = #n, .write = w, .print = p }
1064 #define FEAT_OPF(n, w, p) \
1065 [n] = { .name = #n, .write = w, .print = p, .full_only = true }
1067 static const struct feature_ops feat_ops[HEADER_LAST_FEATURE] = {
1068 FEAT_OPA(HEADER_TRACE_INFO, write_trace_info, NULL),
1069 FEAT_OPA(HEADER_BUILD_ID, write_build_id, NULL),
1070 FEAT_OPA(HEADER_HOSTNAME, write_hostname, print_hostname),
1071 FEAT_OPA(HEADER_OSRELEASE, write_osrelease, print_osrelease),
1072 FEAT_OPA(HEADER_VERSION, write_version, print_version),
1073 FEAT_OPA(HEADER_ARCH, write_arch, print_arch),
1074 FEAT_OPA(HEADER_NRCPUS, write_nrcpus, print_nrcpus),
1075 FEAT_OPA(HEADER_CPUDESC, write_cpudesc, print_cpudesc),
1076 FEAT_OPA(HEADER_CPUID, write_cpuid, print_cpuid),
1077 FEAT_OPA(HEADER_TOTAL_MEM, write_total_mem, print_total_mem),
1078 FEAT_OPA(HEADER_EVENT_DESC, write_event_desc, print_event_desc),
1079 FEAT_OPA(HEADER_CMDLINE, write_cmdline, print_cmdline),
1080 FEAT_OPF(HEADER_CPU_TOPOLOGY, write_cpu_topology, print_cpu_topology),
1081 FEAT_OPF(HEADER_NUMA_TOPOLOGY, write_numa_topology, print_numa_topology),
1084 struct header_print_data {
1086 bool full; /* extended list of headers */
1089 static int perf_file_section__fprintf_info(struct perf_file_section *section,
1090 struct perf_header *ph,
1091 int feat, int fd, void *data)
1093 struct header_print_data *hd = data;
1095 if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
1096 pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
1097 "%d, continuing...\n", section->offset, feat);
1100 if (feat < HEADER_TRACE_INFO || feat >= HEADER_LAST_FEATURE) {
1101 pr_warning("unknown feature %d\n", feat);
1104 if (!feat_ops[feat].print)
1107 if (!feat_ops[feat].full_only || hd->full)
1108 feat_ops[feat].print(ph, fd, hd->fp);
1110 fprintf(hd->fp, "# %s info available, use -I to display\n",
1111 feat_ops[feat].name);
1116 int perf_header__fprintf_info(struct perf_session *session, FILE *fp, bool full)
1118 struct header_print_data hd;
1119 struct perf_header *header = &session->header;
1120 int fd = session->fd;
1124 perf_header__process_sections(header, fd, &hd,
1125 perf_file_section__fprintf_info);
1129 #define dsos__for_each_with_build_id(pos, head) \
1130 list_for_each_entry(pos, head, node) \
1131 if (!pos->has_build_id) \
1135 static int __dsos__write_buildid_table(struct list_head *head, pid_t pid,
1140 dsos__for_each_with_build_id(pos, head) {
1142 struct build_id_event b;
1147 len = pos->long_name_len + 1;
1148 len = ALIGN(len, NAME_ALIGN);
1149 memset(&b, 0, sizeof(b));
1150 memcpy(&b.build_id, pos->build_id, sizeof(pos->build_id));
1152 b.header.misc = misc;
1153 b.header.size = sizeof(b) + len;
1154 err = do_write(fd, &b, sizeof(b));
1157 err = write_padded(fd, pos->long_name,
1158 pos->long_name_len + 1, len);
1166 static int machine__write_buildid_table(struct machine *machine, int fd)
1169 u16 kmisc = PERF_RECORD_MISC_KERNEL,
1170 umisc = PERF_RECORD_MISC_USER;
1172 if (!machine__is_host(machine)) {
1173 kmisc = PERF_RECORD_MISC_GUEST_KERNEL;
1174 umisc = PERF_RECORD_MISC_GUEST_USER;
1177 err = __dsos__write_buildid_table(&machine->kernel_dsos, machine->pid,
1180 err = __dsos__write_buildid_table(&machine->user_dsos,
1181 machine->pid, umisc, fd);
1185 static int dsos__write_buildid_table(struct perf_header *header, int fd)
1187 struct perf_session *session = container_of(header,
1188 struct perf_session, header);
1190 int err = machine__write_buildid_table(&session->host_machine, fd);
1195 for (nd = rb_first(&session->machines); nd; nd = rb_next(nd)) {
1196 struct machine *pos = rb_entry(nd, struct machine, rb_node);
1197 err = machine__write_buildid_table(pos, fd);
1204 int build_id_cache__add_s(const char *sbuild_id, const char *debugdir,
1205 const char *name, bool is_kallsyms)
1207 const size_t size = PATH_MAX;
1208 char *realname, *filename = zalloc(size),
1209 *linkname = zalloc(size), *targetname;
1213 if (symbol_conf.kptr_restrict) {
1214 pr_debug("Not caching a kptr_restrict'ed /proc/kallsyms\n");
1217 realname = (char *)name;
1219 realname = realpath(name, NULL);
1221 if (realname == NULL || filename == NULL || linkname == NULL)
1224 len = scnprintf(filename, size, "%s%s%s",
1225 debugdir, is_kallsyms ? "/" : "", realname);
1226 if (mkdir_p(filename, 0755))
1229 snprintf(filename + len, sizeof(filename) - len, "/%s", sbuild_id);
1231 if (access(filename, F_OK)) {
1233 if (copyfile("/proc/kallsyms", filename))
1235 } else if (link(realname, filename) && copyfile(name, filename))
1239 len = scnprintf(linkname, size, "%s/.build-id/%.2s",
1240 debugdir, sbuild_id);
1242 if (access(linkname, X_OK) && mkdir_p(linkname, 0755))
1245 snprintf(linkname + len, size - len, "/%s", sbuild_id + 2);
1246 targetname = filename + strlen(debugdir) - 5;
1247 memcpy(targetname, "../..", 5);
1249 if (symlink(targetname, linkname) == 0)
1259 static int build_id_cache__add_b(const u8 *build_id, size_t build_id_size,
1260 const char *name, const char *debugdir,
1263 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
1265 build_id__sprintf(build_id, build_id_size, sbuild_id);
1267 return build_id_cache__add_s(sbuild_id, debugdir, name, is_kallsyms);
1270 int build_id_cache__remove_s(const char *sbuild_id, const char *debugdir)
1272 const size_t size = PATH_MAX;
1273 char *filename = zalloc(size),
1274 *linkname = zalloc(size);
1277 if (filename == NULL || linkname == NULL)
1280 snprintf(linkname, size, "%s/.build-id/%.2s/%s",
1281 debugdir, sbuild_id, sbuild_id + 2);
1283 if (access(linkname, F_OK))
1286 if (readlink(linkname, filename, size - 1) < 0)
1289 if (unlink(linkname))
1293 * Since the link is relative, we must make it absolute:
1295 snprintf(linkname, size, "%s/.build-id/%.2s/%s",
1296 debugdir, sbuild_id, filename);
1298 if (unlink(linkname))
1308 static int dso__cache_build_id(struct dso *dso, const char *debugdir)
1310 bool is_kallsyms = dso->kernel && dso->long_name[0] != '/';
1312 return build_id_cache__add_b(dso->build_id, sizeof(dso->build_id),
1313 dso->long_name, debugdir, is_kallsyms);
1316 static int __dsos__cache_build_ids(struct list_head *head, const char *debugdir)
1321 dsos__for_each_with_build_id(pos, head)
1322 if (dso__cache_build_id(pos, debugdir))
1328 static int machine__cache_build_ids(struct machine *machine, const char *debugdir)
1330 int ret = __dsos__cache_build_ids(&machine->kernel_dsos, debugdir);
1331 ret |= __dsos__cache_build_ids(&machine->user_dsos, debugdir);
1335 static int perf_session__cache_build_ids(struct perf_session *session)
1339 char debugdir[PATH_MAX];
1341 snprintf(debugdir, sizeof(debugdir), "%s", buildid_dir);
1343 if (mkdir(debugdir, 0755) != 0 && errno != EEXIST)
1346 ret = machine__cache_build_ids(&session->host_machine, debugdir);
1348 for (nd = rb_first(&session->machines); nd; nd = rb_next(nd)) {
1349 struct machine *pos = rb_entry(nd, struct machine, rb_node);
1350 ret |= machine__cache_build_ids(pos, debugdir);
1352 return ret ? -1 : 0;
1355 static bool machine__read_build_ids(struct machine *machine, bool with_hits)
1357 bool ret = __dsos__read_build_ids(&machine->kernel_dsos, with_hits);
1358 ret |= __dsos__read_build_ids(&machine->user_dsos, with_hits);
1362 static bool perf_session__read_build_ids(struct perf_session *session, bool with_hits)
1365 bool ret = machine__read_build_ids(&session->host_machine, with_hits);
1367 for (nd = rb_first(&session->machines); nd; nd = rb_next(nd)) {
1368 struct machine *pos = rb_entry(nd, struct machine, rb_node);
1369 ret |= machine__read_build_ids(pos, with_hits);
1375 static int do_write_feat(int fd, struct perf_header *h, int type,
1376 struct perf_file_section **p,
1377 struct perf_evlist *evlist)
1382 if (perf_header__has_feat(h, type)) {
1384 (*p)->offset = lseek(fd, 0, SEEK_CUR);
1386 err = feat_ops[type].write(fd, h, evlist);
1388 pr_debug("failed to write feature %d\n", type);
1390 /* undo anything written */
1391 lseek(fd, (*p)->offset, SEEK_SET);
1395 (*p)->size = lseek(fd, 0, SEEK_CUR) - (*p)->offset;
1401 static int perf_header__adds_write(struct perf_header *header,
1402 struct perf_evlist *evlist, int fd)
1405 struct perf_session *session;
1406 struct perf_file_section *feat_sec, *p;
1411 session = container_of(header, struct perf_session, header);
1413 if (perf_header__has_feat(header, HEADER_BUILD_ID &&
1414 !perf_session__read_build_ids(session, true)))
1415 perf_header__clear_feat(header, HEADER_BUILD_ID);
1417 nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
1421 feat_sec = p = calloc(sizeof(*feat_sec), nr_sections);
1422 if (feat_sec == NULL)
1425 sec_size = sizeof(*feat_sec) * nr_sections;
1427 sec_start = header->data_offset + header->data_size;
1428 lseek(fd, sec_start + sec_size, SEEK_SET);
1430 err = do_write_feat(fd, header, HEADER_TRACE_INFO, &p, evlist);
1434 err = do_write_feat(fd, header, HEADER_BUILD_ID, &p, evlist);
1436 perf_header__clear_feat(header, HEADER_BUILD_ID);
1440 err = do_write_feat(fd, header, HEADER_HOSTNAME, &p, evlist);
1442 perf_header__clear_feat(header, HEADER_HOSTNAME);
1444 err = do_write_feat(fd, header, HEADER_OSRELEASE, &p, evlist);
1446 perf_header__clear_feat(header, HEADER_OSRELEASE);
1448 err = do_write_feat(fd, header, HEADER_VERSION, &p, evlist);
1450 perf_header__clear_feat(header, HEADER_VERSION);
1452 err = do_write_feat(fd, header, HEADER_ARCH, &p, evlist);
1454 perf_header__clear_feat(header, HEADER_ARCH);
1456 err = do_write_feat(fd, header, HEADER_NRCPUS, &p, evlist);
1458 perf_header__clear_feat(header, HEADER_NRCPUS);
1460 err = do_write_feat(fd, header, HEADER_CPUDESC, &p, evlist);
1462 perf_header__clear_feat(header, HEADER_CPUDESC);
1464 err = do_write_feat(fd, header, HEADER_CPUID, &p, evlist);
1466 perf_header__clear_feat(header, HEADER_CPUID);
1468 err = do_write_feat(fd, header, HEADER_TOTAL_MEM, &p, evlist);
1470 perf_header__clear_feat(header, HEADER_TOTAL_MEM);
1472 err = do_write_feat(fd, header, HEADER_CMDLINE, &p, evlist);
1474 perf_header__clear_feat(header, HEADER_CMDLINE);
1476 err = do_write_feat(fd, header, HEADER_EVENT_DESC, &p, evlist);
1478 perf_header__clear_feat(header, HEADER_EVENT_DESC);
1480 err = do_write_feat(fd, header, HEADER_CPU_TOPOLOGY, &p, evlist);
1482 perf_header__clear_feat(header, HEADER_CPU_TOPOLOGY);
1484 err = do_write_feat(fd, header, HEADER_NUMA_TOPOLOGY, &p, evlist);
1486 perf_header__clear_feat(header, HEADER_NUMA_TOPOLOGY);
1488 lseek(fd, sec_start, SEEK_SET);
1490 * may write more than needed due to dropped feature, but
1491 * this is okay, reader will skip the mising entries
1493 err = do_write(fd, feat_sec, sec_size);
1495 pr_debug("failed to write feature section\n");
1501 int perf_header__write_pipe(int fd)
1503 struct perf_pipe_file_header f_header;
1506 f_header = (struct perf_pipe_file_header){
1507 .magic = PERF_MAGIC,
1508 .size = sizeof(f_header),
1511 err = do_write(fd, &f_header, sizeof(f_header));
1513 pr_debug("failed to write perf pipe header\n");
1520 int perf_session__write_header(struct perf_session *session,
1521 struct perf_evlist *evlist,
1522 int fd, bool at_exit)
1524 struct perf_file_header f_header;
1525 struct perf_file_attr f_attr;
1526 struct perf_header *header = &session->header;
1527 struct perf_evsel *attr, *pair = NULL;
1530 lseek(fd, sizeof(f_header), SEEK_SET);
1532 if (session->evlist != evlist)
1533 pair = list_entry(session->evlist->entries.next, struct perf_evsel, node);
1535 list_for_each_entry(attr, &evlist->entries, node) {
1536 attr->id_offset = lseek(fd, 0, SEEK_CUR);
1537 err = do_write(fd, attr->id, attr->ids * sizeof(u64));
1540 pr_debug("failed to write perf header\n");
1543 if (session->evlist != evlist) {
1544 err = do_write(fd, pair->id, pair->ids * sizeof(u64));
1547 attr->ids += pair->ids;
1548 pair = list_entry(pair->node.next, struct perf_evsel, node);
1552 header->attr_offset = lseek(fd, 0, SEEK_CUR);
1554 list_for_each_entry(attr, &evlist->entries, node) {
1555 f_attr = (struct perf_file_attr){
1558 .offset = attr->id_offset,
1559 .size = attr->ids * sizeof(u64),
1562 err = do_write(fd, &f_attr, sizeof(f_attr));
1564 pr_debug("failed to write perf header attribute\n");
1569 header->event_offset = lseek(fd, 0, SEEK_CUR);
1570 header->event_size = event_count * sizeof(struct perf_trace_event_type);
1572 err = do_write(fd, events, header->event_size);
1574 pr_debug("failed to write perf header events\n");
1579 header->data_offset = lseek(fd, 0, SEEK_CUR);
1582 err = perf_header__adds_write(header, evlist, fd);
1587 f_header = (struct perf_file_header){
1588 .magic = PERF_MAGIC,
1589 .size = sizeof(f_header),
1590 .attr_size = sizeof(f_attr),
1592 .offset = header->attr_offset,
1593 .size = evlist->nr_entries * sizeof(f_attr),
1596 .offset = header->data_offset,
1597 .size = header->data_size,
1600 .offset = header->event_offset,
1601 .size = header->event_size,
1605 memcpy(&f_header.adds_features, &header->adds_features, sizeof(header->adds_features));
1607 lseek(fd, 0, SEEK_SET);
1608 err = do_write(fd, &f_header, sizeof(f_header));
1610 pr_debug("failed to write perf header\n");
1613 lseek(fd, header->data_offset + header->data_size, SEEK_SET);
1619 static int perf_header__getbuffer64(struct perf_header *header,
1620 int fd, void *buf, size_t size)
1622 if (readn(fd, buf, size) <= 0)
1625 if (header->needs_swap)
1626 mem_bswap_64(buf, size);
1631 int perf_header__process_sections(struct perf_header *header, int fd,
1633 int (*process)(struct perf_file_section *section,
1634 struct perf_header *ph,
1635 int feat, int fd, void *data))
1637 struct perf_file_section *feat_sec;
1641 int err = -1, feat = 1;
1643 nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
1647 feat_sec = calloc(sizeof(*feat_sec), nr_sections);
1651 sec_size = sizeof(*feat_sec) * nr_sections;
1653 lseek(fd, header->data_offset + header->data_size, SEEK_SET);
1655 if (perf_header__getbuffer64(header, fd, feat_sec, sec_size))
1659 while (idx < nr_sections && feat < HEADER_LAST_FEATURE) {
1660 if (perf_header__has_feat(header, feat)) {
1661 struct perf_file_section *sec = &feat_sec[idx++];
1663 err = process(sec, header, feat, fd, data);
1674 int perf_file_header__read(struct perf_file_header *header,
1675 struct perf_header *ph, int fd)
1677 lseek(fd, 0, SEEK_SET);
1679 if (readn(fd, header, sizeof(*header)) <= 0 ||
1680 memcmp(&header->magic, __perf_magic, sizeof(header->magic)))
1683 if (header->attr_size != sizeof(struct perf_file_attr)) {
1684 u64 attr_size = bswap_64(header->attr_size);
1686 if (attr_size != sizeof(struct perf_file_attr))
1689 mem_bswap_64(header, offsetof(struct perf_file_header,
1691 ph->needs_swap = true;
1694 if (header->size != sizeof(*header)) {
1695 /* Support the previous format */
1696 if (header->size == offsetof(typeof(*header), adds_features))
1697 bitmap_zero(header->adds_features, HEADER_FEAT_BITS);
1700 } else if (ph->needs_swap) {
1703 * feature bitmap is declared as an array of unsigned longs --
1704 * not good since its size can differ between the host that
1705 * generated the data file and the host analyzing the file.
1707 * We need to handle endianness, but we don't know the size of
1708 * the unsigned long where the file was generated. Take a best
1709 * guess at determining it: try 64-bit swap first (ie., file
1710 * created on a 64-bit host), and check if the hostname feature
1711 * bit is set (this feature bit is forced on as of fbe96f2).
1712 * If the bit is not, undo the 64-bit swap and try a 32-bit
1713 * swap. If the hostname bit is still not set (e.g., older data
1714 * file), punt and fallback to the original behavior --
1715 * clearing all feature bits and setting buildid.
1717 for (i = 0; i < BITS_TO_LONGS(HEADER_FEAT_BITS); ++i)
1718 header->adds_features[i] = bswap_64(header->adds_features[i]);
1720 if (!test_bit(HEADER_HOSTNAME, header->adds_features)) {
1721 for (i = 0; i < BITS_TO_LONGS(HEADER_FEAT_BITS); ++i) {
1722 header->adds_features[i] = bswap_64(header->adds_features[i]);
1723 header->adds_features[i] = bswap_32(header->adds_features[i]);
1727 if (!test_bit(HEADER_HOSTNAME, header->adds_features)) {
1728 bitmap_zero(header->adds_features, HEADER_FEAT_BITS);
1729 set_bit(HEADER_BUILD_ID, header->adds_features);
1733 memcpy(&ph->adds_features, &header->adds_features,
1734 sizeof(ph->adds_features));
1736 ph->event_offset = header->event_types.offset;
1737 ph->event_size = header->event_types.size;
1738 ph->data_offset = header->data.offset;
1739 ph->data_size = header->data.size;
1743 static int __event_process_build_id(struct build_id_event *bev,
1745 struct perf_session *session)
1748 struct list_head *head;
1749 struct machine *machine;
1752 enum dso_kernel_type dso_type;
1754 machine = perf_session__findnew_machine(session, bev->pid);
1758 misc = bev->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1761 case PERF_RECORD_MISC_KERNEL:
1762 dso_type = DSO_TYPE_KERNEL;
1763 head = &machine->kernel_dsos;
1765 case PERF_RECORD_MISC_GUEST_KERNEL:
1766 dso_type = DSO_TYPE_GUEST_KERNEL;
1767 head = &machine->kernel_dsos;
1769 case PERF_RECORD_MISC_USER:
1770 case PERF_RECORD_MISC_GUEST_USER:
1771 dso_type = DSO_TYPE_USER;
1772 head = &machine->user_dsos;
1778 dso = __dsos__findnew(head, filename);
1780 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
1782 dso__set_build_id(dso, &bev->build_id);
1784 if (filename[0] == '[')
1785 dso->kernel = dso_type;
1787 build_id__sprintf(dso->build_id, sizeof(dso->build_id),
1789 pr_debug("build id event received for %s: %s\n",
1790 dso->long_name, sbuild_id);
1798 static int perf_header__read_build_ids_abi_quirk(struct perf_header *header,
1799 int input, u64 offset, u64 size)
1801 struct perf_session *session = container_of(header, struct perf_session, header);
1803 struct perf_event_header header;
1804 u8 build_id[ALIGN(BUILD_ID_SIZE, sizeof(u64))];
1807 struct build_id_event bev;
1808 char filename[PATH_MAX];
1809 u64 limit = offset + size;
1811 while (offset < limit) {
1814 if (read(input, &old_bev, sizeof(old_bev)) != sizeof(old_bev))
1817 if (header->needs_swap)
1818 perf_event_header__bswap(&old_bev.header);
1820 len = old_bev.header.size - sizeof(old_bev);
1821 if (read(input, filename, len) != len)
1824 bev.header = old_bev.header;
1827 * As the pid is the missing value, we need to fill
1828 * it properly. The header.misc value give us nice hint.
1830 bev.pid = HOST_KERNEL_ID;
1831 if (bev.header.misc == PERF_RECORD_MISC_GUEST_USER ||
1832 bev.header.misc == PERF_RECORD_MISC_GUEST_KERNEL)
1833 bev.pid = DEFAULT_GUEST_KERNEL_ID;
1835 memcpy(bev.build_id, old_bev.build_id, sizeof(bev.build_id));
1836 __event_process_build_id(&bev, filename, session);
1838 offset += bev.header.size;
1844 static int perf_header__read_build_ids(struct perf_header *header,
1845 int input, u64 offset, u64 size)
1847 struct perf_session *session = container_of(header, struct perf_session, header);
1848 struct build_id_event bev;
1849 char filename[PATH_MAX];
1850 u64 limit = offset + size, orig_offset = offset;
1853 while (offset < limit) {
1856 if (read(input, &bev, sizeof(bev)) != sizeof(bev))
1859 if (header->needs_swap)
1860 perf_event_header__bswap(&bev.header);
1862 len = bev.header.size - sizeof(bev);
1863 if (read(input, filename, len) != len)
1866 * The a1645ce1 changeset:
1868 * "perf: 'perf kvm' tool for monitoring guest performance from host"
1870 * Added a field to struct build_id_event that broke the file
1873 * Since the kernel build-id is the first entry, process the
1874 * table using the old format if the well known
1875 * '[kernel.kallsyms]' string for the kernel build-id has the
1876 * first 4 characters chopped off (where the pid_t sits).
1878 if (memcmp(filename, "nel.kallsyms]", 13) == 0) {
1879 if (lseek(input, orig_offset, SEEK_SET) == (off_t)-1)
1881 return perf_header__read_build_ids_abi_quirk(header, input, offset, size);
1884 __event_process_build_id(&bev, filename, session);
1886 offset += bev.header.size;
1893 static int perf_file_section__process(struct perf_file_section *section,
1894 struct perf_header *ph,
1895 int feat, int fd, void *data __used)
1897 if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
1898 pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
1899 "%d, continuing...\n", section->offset, feat);
1904 case HEADER_TRACE_INFO:
1905 trace_report(fd, false);
1908 case HEADER_BUILD_ID:
1909 if (perf_header__read_build_ids(ph, fd, section->offset, section->size))
1910 pr_debug("Failed to read buildids, continuing...\n");
1913 case HEADER_HOSTNAME:
1914 case HEADER_OSRELEASE:
1915 case HEADER_VERSION:
1918 case HEADER_CPUDESC:
1920 case HEADER_TOTAL_MEM:
1921 case HEADER_CMDLINE:
1922 case HEADER_EVENT_DESC:
1923 case HEADER_CPU_TOPOLOGY:
1924 case HEADER_NUMA_TOPOLOGY:
1928 pr_debug("unknown feature %d, continuing...\n", feat);
1934 static int perf_file_header__read_pipe(struct perf_pipe_file_header *header,
1935 struct perf_header *ph, int fd,
1938 if (readn(fd, header, sizeof(*header)) <= 0 ||
1939 memcmp(&header->magic, __perf_magic, sizeof(header->magic)))
1942 if (repipe && do_write(STDOUT_FILENO, header, sizeof(*header)) < 0)
1945 if (header->size != sizeof(*header)) {
1946 u64 size = bswap_64(header->size);
1948 if (size != sizeof(*header))
1951 ph->needs_swap = true;
1957 static int perf_header__read_pipe(struct perf_session *session, int fd)
1959 struct perf_header *header = &session->header;
1960 struct perf_pipe_file_header f_header;
1962 if (perf_file_header__read_pipe(&f_header, header, fd,
1963 session->repipe) < 0) {
1964 pr_debug("incompatible file format\n");
1973 int perf_session__read_header(struct perf_session *session, int fd)
1975 struct perf_header *header = &session->header;
1976 struct perf_file_header f_header;
1977 struct perf_file_attr f_attr;
1979 int nr_attrs, nr_ids, i, j;
1981 session->evlist = perf_evlist__new(NULL, NULL);
1982 if (session->evlist == NULL)
1985 if (session->fd_pipe)
1986 return perf_header__read_pipe(session, fd);
1988 if (perf_file_header__read(&f_header, header, fd) < 0) {
1989 pr_debug("incompatible file format\n");
1993 nr_attrs = f_header.attrs.size / sizeof(f_attr);
1994 lseek(fd, f_header.attrs.offset, SEEK_SET);
1996 for (i = 0; i < nr_attrs; i++) {
1997 struct perf_evsel *evsel;
2000 if (readn(fd, &f_attr, sizeof(f_attr)) <= 0)
2003 if (header->needs_swap)
2004 perf_event__attr_swap(&f_attr.attr);
2006 tmp = lseek(fd, 0, SEEK_CUR);
2007 evsel = perf_evsel__new(&f_attr.attr, i);
2010 goto out_delete_evlist;
2012 * Do it before so that if perf_evsel__alloc_id fails, this
2013 * entry gets purged too at perf_evlist__delete().
2015 perf_evlist__add(session->evlist, evsel);
2017 nr_ids = f_attr.ids.size / sizeof(u64);
2019 * We don't have the cpu and thread maps on the header, so
2020 * for allocating the perf_sample_id table we fake 1 cpu and
2021 * hattr->ids threads.
2023 if (perf_evsel__alloc_id(evsel, 1, nr_ids))
2024 goto out_delete_evlist;
2026 lseek(fd, f_attr.ids.offset, SEEK_SET);
2028 for (j = 0; j < nr_ids; j++) {
2029 if (perf_header__getbuffer64(header, fd, &f_id, sizeof(f_id)))
2032 perf_evlist__id_add(session->evlist, evsel, 0, j, f_id);
2035 lseek(fd, tmp, SEEK_SET);
2038 if (f_header.event_types.size) {
2039 lseek(fd, f_header.event_types.offset, SEEK_SET);
2040 events = malloc(f_header.event_types.size);
2043 if (perf_header__getbuffer64(header, fd, events,
2044 f_header.event_types.size))
2046 event_count = f_header.event_types.size / sizeof(struct perf_trace_event_type);
2049 perf_header__process_sections(header, fd, NULL,
2050 perf_file_section__process);
2052 lseek(fd, header->data_offset, SEEK_SET);
2060 perf_evlist__delete(session->evlist);
2061 session->evlist = NULL;
2065 int perf_event__synthesize_attr(struct perf_event_attr *attr, u16 ids, u64 *id,
2066 perf_event__handler_t process,
2067 struct perf_session *session)
2069 union perf_event *ev;
2073 size = sizeof(struct perf_event_attr);
2074 size = ALIGN(size, sizeof(u64));
2075 size += sizeof(struct perf_event_header);
2076 size += ids * sizeof(u64);
2083 ev->attr.attr = *attr;
2084 memcpy(ev->attr.id, id, ids * sizeof(u64));
2086 ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
2087 ev->attr.header.size = size;
2089 err = process(ev, NULL, session);
2096 int perf_session__synthesize_attrs(struct perf_session *session,
2097 perf_event__handler_t process)
2099 struct perf_evsel *attr;
2102 list_for_each_entry(attr, &session->evlist->entries, node) {
2103 err = perf_event__synthesize_attr(&attr->attr, attr->ids,
2104 attr->id, process, session);
2106 pr_debug("failed to create perf header attribute\n");
2114 int perf_event__process_attr(union perf_event *event,
2115 struct perf_session *session)
2117 unsigned int i, ids, n_ids;
2118 struct perf_evsel *evsel;
2120 if (session->evlist == NULL) {
2121 session->evlist = perf_evlist__new(NULL, NULL);
2122 if (session->evlist == NULL)
2126 evsel = perf_evsel__new(&event->attr.attr,
2127 session->evlist->nr_entries);
2131 perf_evlist__add(session->evlist, evsel);
2133 ids = event->header.size;
2134 ids -= (void *)&event->attr.id - (void *)event;
2135 n_ids = ids / sizeof(u64);
2137 * We don't have the cpu and thread maps on the header, so
2138 * for allocating the perf_sample_id table we fake 1 cpu and
2139 * hattr->ids threads.
2141 if (perf_evsel__alloc_id(evsel, 1, n_ids))
2144 for (i = 0; i < n_ids; i++) {
2145 perf_evlist__id_add(session->evlist, evsel, 0, i,
2149 perf_session__update_sample_type(session);
2154 int perf_event__synthesize_event_type(u64 event_id, char *name,
2155 perf_event__handler_t process,
2156 struct perf_session *session)
2158 union perf_event ev;
2162 memset(&ev, 0, sizeof(ev));
2164 ev.event_type.event_type.event_id = event_id;
2165 memset(ev.event_type.event_type.name, 0, MAX_EVENT_NAME);
2166 strncpy(ev.event_type.event_type.name, name, MAX_EVENT_NAME - 1);
2168 ev.event_type.header.type = PERF_RECORD_HEADER_EVENT_TYPE;
2169 size = strlen(name);
2170 size = ALIGN(size, sizeof(u64));
2171 ev.event_type.header.size = sizeof(ev.event_type) -
2172 (sizeof(ev.event_type.event_type.name) - size);
2174 err = process(&ev, NULL, session);
2179 int perf_event__synthesize_event_types(perf_event__handler_t process,
2180 struct perf_session *session)
2182 struct perf_trace_event_type *type;
2185 for (i = 0; i < event_count; i++) {
2188 err = perf_event__synthesize_event_type(type->event_id,
2189 type->name, process,
2192 pr_debug("failed to create perf header event type\n");
2200 int perf_event__process_event_type(union perf_event *event,
2201 struct perf_session *session __unused)
2203 if (perf_header__push_event(event->event_type.event_type.event_id,
2204 event->event_type.event_type.name) < 0)
2210 int perf_event__synthesize_tracing_data(int fd, struct perf_evlist *evlist,
2211 perf_event__handler_t process,
2212 struct perf_session *session __unused)
2214 union perf_event ev;
2215 struct tracing_data *tdata;
2216 ssize_t size = 0, aligned_size = 0, padding;
2220 * We are going to store the size of the data followed
2221 * by the data contents. Since the fd descriptor is a pipe,
2222 * we cannot seek back to store the size of the data once
2223 * we know it. Instead we:
2225 * - write the tracing data to the temp file
2226 * - get/write the data size to pipe
2227 * - write the tracing data from the temp file
2230 tdata = tracing_data_get(&evlist->entries, fd, true);
2234 memset(&ev, 0, sizeof(ev));
2236 ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
2238 aligned_size = ALIGN(size, sizeof(u64));
2239 padding = aligned_size - size;
2240 ev.tracing_data.header.size = sizeof(ev.tracing_data);
2241 ev.tracing_data.size = aligned_size;
2243 process(&ev, NULL, session);
2246 * The put function will copy all the tracing data
2247 * stored in temp file to the pipe.
2249 tracing_data_put(tdata);
2251 write_padded(fd, NULL, 0, padding);
2253 return aligned_size;
2256 int perf_event__process_tracing_data(union perf_event *event,
2257 struct perf_session *session)
2259 ssize_t size_read, padding, size = event->tracing_data.size;
2260 off_t offset = lseek(session->fd, 0, SEEK_CUR);
2263 /* setup for reading amidst mmap */
2264 lseek(session->fd, offset + sizeof(struct tracing_data_event),
2267 size_read = trace_report(session->fd, session->repipe);
2269 padding = ALIGN(size_read, sizeof(u64)) - size_read;
2271 if (read(session->fd, buf, padding) < 0)
2272 die("reading input file");
2273 if (session->repipe) {
2274 int retw = write(STDOUT_FILENO, buf, padding);
2275 if (retw <= 0 || retw != padding)
2276 die("repiping tracing data padding");
2279 if (size_read + padding != size)
2280 die("tracing data size mismatch");
2282 return size_read + padding;
2285 int perf_event__synthesize_build_id(struct dso *pos, u16 misc,
2286 perf_event__handler_t process,
2287 struct machine *machine,
2288 struct perf_session *session)
2290 union perf_event ev;
2297 memset(&ev, 0, sizeof(ev));
2299 len = pos->long_name_len + 1;
2300 len = ALIGN(len, NAME_ALIGN);
2301 memcpy(&ev.build_id.build_id, pos->build_id, sizeof(pos->build_id));
2302 ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
2303 ev.build_id.header.misc = misc;
2304 ev.build_id.pid = machine->pid;
2305 ev.build_id.header.size = sizeof(ev.build_id) + len;
2306 memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
2308 err = process(&ev, NULL, session);
2313 int perf_event__process_build_id(union perf_event *event,
2314 struct perf_session *session)
2316 __event_process_build_id(&event->build_id,
2317 event->build_id.filename,
2322 void disable_buildid_cache(void)
2324 no_buildid_cache = true;