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TOMOYO Linux Cross Reference
Linux/tools/perf/util/event.c

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Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 // SPDX-License-Identifier: GPL-2.0
  2 #include <dirent.h>
  3 #include <errno.h>
  4 #include <fcntl.h>
  5 #include <inttypes.h>
  6 #include <linux/kernel.h>
  7 #include <linux/types.h>
  8 #include <sys/types.h>
  9 #include <sys/stat.h>
 10 #include <unistd.h>
 11 #include <uapi/linux/mman.h> /* To get things like MAP_HUGETLB even on older libc headers */
 12 #include <api/fs/fs.h>
 13 #include <linux/perf_event.h>
 14 #include "event.h"
 15 #include "debug.h"
 16 #include "hist.h"
 17 #include "machine.h"
 18 #include "sort.h"
 19 #include "string2.h"
 20 #include "strlist.h"
 21 #include "thread.h"
 22 #include "thread_map.h"
 23 #include "sane_ctype.h"
 24 #include "symbol/kallsyms.h"
 25 #include "asm/bug.h"
 26 #include "stat.h"
 27 
 28 static const char *perf_event__names[] = {
 29         [0]                                     = "TOTAL",
 30         [PERF_RECORD_MMAP]                      = "MMAP",
 31         [PERF_RECORD_MMAP2]                     = "MMAP2",
 32         [PERF_RECORD_LOST]                      = "LOST",
 33         [PERF_RECORD_COMM]                      = "COMM",
 34         [PERF_RECORD_EXIT]                      = "EXIT",
 35         [PERF_RECORD_THROTTLE]                  = "THROTTLE",
 36         [PERF_RECORD_UNTHROTTLE]                = "UNTHROTTLE",
 37         [PERF_RECORD_FORK]                      = "FORK",
 38         [PERF_RECORD_READ]                      = "READ",
 39         [PERF_RECORD_SAMPLE]                    = "SAMPLE",
 40         [PERF_RECORD_AUX]                       = "AUX",
 41         [PERF_RECORD_ITRACE_START]              = "ITRACE_START",
 42         [PERF_RECORD_LOST_SAMPLES]              = "LOST_SAMPLES",
 43         [PERF_RECORD_SWITCH]                    = "SWITCH",
 44         [PERF_RECORD_SWITCH_CPU_WIDE]           = "SWITCH_CPU_WIDE",
 45         [PERF_RECORD_NAMESPACES]                = "NAMESPACES",
 46         [PERF_RECORD_HEADER_ATTR]               = "ATTR",
 47         [PERF_RECORD_HEADER_EVENT_TYPE]         = "EVENT_TYPE",
 48         [PERF_RECORD_HEADER_TRACING_DATA]       = "TRACING_DATA",
 49         [PERF_RECORD_HEADER_BUILD_ID]           = "BUILD_ID",
 50         [PERF_RECORD_FINISHED_ROUND]            = "FINISHED_ROUND",
 51         [PERF_RECORD_ID_INDEX]                  = "ID_INDEX",
 52         [PERF_RECORD_AUXTRACE_INFO]             = "AUXTRACE_INFO",
 53         [PERF_RECORD_AUXTRACE]                  = "AUXTRACE",
 54         [PERF_RECORD_AUXTRACE_ERROR]            = "AUXTRACE_ERROR",
 55         [PERF_RECORD_THREAD_MAP]                = "THREAD_MAP",
 56         [PERF_RECORD_CPU_MAP]                   = "CPU_MAP",
 57         [PERF_RECORD_STAT_CONFIG]               = "STAT_CONFIG",
 58         [PERF_RECORD_STAT]                      = "STAT",
 59         [PERF_RECORD_STAT_ROUND]                = "STAT_ROUND",
 60         [PERF_RECORD_EVENT_UPDATE]              = "EVENT_UPDATE",
 61         [PERF_RECORD_TIME_CONV]                 = "TIME_CONV",
 62         [PERF_RECORD_HEADER_FEATURE]            = "FEATURE",
 63 };
 64 
 65 static const char *perf_ns__names[] = {
 66         [NET_NS_INDEX]          = "net",
 67         [UTS_NS_INDEX]          = "uts",
 68         [IPC_NS_INDEX]          = "ipc",
 69         [PID_NS_INDEX]          = "pid",
 70         [USER_NS_INDEX]         = "user",
 71         [MNT_NS_INDEX]          = "mnt",
 72         [CGROUP_NS_INDEX]       = "cgroup",
 73 };
 74 
 75 const char *perf_event__name(unsigned int id)
 76 {
 77         if (id >= ARRAY_SIZE(perf_event__names))
 78                 return "INVALID";
 79         if (!perf_event__names[id])
 80                 return "UNKNOWN";
 81         return perf_event__names[id];
 82 }
 83 
 84 static const char *perf_ns__name(unsigned int id)
 85 {
 86         if (id >= ARRAY_SIZE(perf_ns__names))
 87                 return "UNKNOWN";
 88         return perf_ns__names[id];
 89 }
 90 
 91 int perf_tool__process_synth_event(struct perf_tool *tool,
 92                                    union perf_event *event,
 93                                    struct machine *machine,
 94                                    perf_event__handler_t process)
 95 {
 96         struct perf_sample synth_sample = {
 97         .pid       = -1,
 98         .tid       = -1,
 99         .time      = -1,
100         .stream_id = -1,
101         .cpu       = -1,
102         .period    = 1,
103         .cpumode   = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK,
104         };
105 
106         return process(tool, event, &synth_sample, machine);
107 };
108 
109 /*
110  * Assumes that the first 4095 bytes of /proc/pid/stat contains
111  * the comm, tgid and ppid.
112  */
113 static int perf_event__get_comm_ids(pid_t pid, char *comm, size_t len,
114                                     pid_t *tgid, pid_t *ppid)
115 {
116         char filename[PATH_MAX];
117         char bf[4096];
118         int fd;
119         size_t size = 0;
120         ssize_t n;
121         char *name, *tgids, *ppids;
122 
123         *tgid = -1;
124         *ppid = -1;
125 
126         snprintf(filename, sizeof(filename), "/proc/%d/status", pid);
127 
128         fd = open(filename, O_RDONLY);
129         if (fd < 0) {
130                 pr_debug("couldn't open %s\n", filename);
131                 return -1;
132         }
133 
134         n = read(fd, bf, sizeof(bf) - 1);
135         close(fd);
136         if (n <= 0) {
137                 pr_warning("Couldn't get COMM, tigd and ppid for pid %d\n",
138                            pid);
139                 return -1;
140         }
141         bf[n] = '\0';
142 
143         name = strstr(bf, "Name:");
144         tgids = strstr(bf, "Tgid:");
145         ppids = strstr(bf, "PPid:");
146 
147         if (name) {
148                 char *nl;
149 
150                 name += 5;  /* strlen("Name:") */
151                 name = ltrim(name);
152 
153                 nl = strchr(name, '\n');
154                 if (nl)
155                         *nl = '\0';
156 
157                 size = strlen(name);
158                 if (size >= len)
159                         size = len - 1;
160                 memcpy(comm, name, size);
161                 comm[size] = '\0';
162         } else {
163                 pr_debug("Name: string not found for pid %d\n", pid);
164         }
165 
166         if (tgids) {
167                 tgids += 5;  /* strlen("Tgid:") */
168                 *tgid = atoi(tgids);
169         } else {
170                 pr_debug("Tgid: string not found for pid %d\n", pid);
171         }
172 
173         if (ppids) {
174                 ppids += 5;  /* strlen("PPid:") */
175                 *ppid = atoi(ppids);
176         } else {
177                 pr_debug("PPid: string not found for pid %d\n", pid);
178         }
179 
180         return 0;
181 }
182 
183 static int perf_event__prepare_comm(union perf_event *event, pid_t pid,
184                                     struct machine *machine,
185                                     pid_t *tgid, pid_t *ppid)
186 {
187         size_t size;
188 
189         *ppid = -1;
190 
191         memset(&event->comm, 0, sizeof(event->comm));
192 
193         if (machine__is_host(machine)) {
194                 if (perf_event__get_comm_ids(pid, event->comm.comm,
195                                              sizeof(event->comm.comm),
196                                              tgid, ppid) != 0) {
197                         return -1;
198                 }
199         } else {
200                 *tgid = machine->pid;
201         }
202 
203         if (*tgid < 0)
204                 return -1;
205 
206         event->comm.pid = *tgid;
207         event->comm.header.type = PERF_RECORD_COMM;
208 
209         size = strlen(event->comm.comm) + 1;
210         size = PERF_ALIGN(size, sizeof(u64));
211         memset(event->comm.comm + size, 0, machine->id_hdr_size);
212         event->comm.header.size = (sizeof(event->comm) -
213                                 (sizeof(event->comm.comm) - size) +
214                                 machine->id_hdr_size);
215         event->comm.tid = pid;
216 
217         return 0;
218 }
219 
220 pid_t perf_event__synthesize_comm(struct perf_tool *tool,
221                                          union perf_event *event, pid_t pid,
222                                          perf_event__handler_t process,
223                                          struct machine *machine)
224 {
225         pid_t tgid, ppid;
226 
227         if (perf_event__prepare_comm(event, pid, machine, &tgid, &ppid) != 0)
228                 return -1;
229 
230         if (perf_tool__process_synth_event(tool, event, machine, process) != 0)
231                 return -1;
232 
233         return tgid;
234 }
235 
236 static void perf_event__get_ns_link_info(pid_t pid, const char *ns,
237                                          struct perf_ns_link_info *ns_link_info)
238 {
239         struct stat64 st;
240         char proc_ns[128];
241 
242         sprintf(proc_ns, "/proc/%u/ns/%s", pid, ns);
243         if (stat64(proc_ns, &st) == 0) {
244                 ns_link_info->dev = st.st_dev;
245                 ns_link_info->ino = st.st_ino;
246         }
247 }
248 
249 int perf_event__synthesize_namespaces(struct perf_tool *tool,
250                                       union perf_event *event,
251                                       pid_t pid, pid_t tgid,
252                                       perf_event__handler_t process,
253                                       struct machine *machine)
254 {
255         u32 idx;
256         struct perf_ns_link_info *ns_link_info;
257 
258         if (!tool || !tool->namespace_events)
259                 return 0;
260 
261         memset(&event->namespaces, 0, (sizeof(event->namespaces) +
262                (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
263                machine->id_hdr_size));
264 
265         event->namespaces.pid = tgid;
266         event->namespaces.tid = pid;
267 
268         event->namespaces.nr_namespaces = NR_NAMESPACES;
269 
270         ns_link_info = event->namespaces.link_info;
271 
272         for (idx = 0; idx < event->namespaces.nr_namespaces; idx++)
273                 perf_event__get_ns_link_info(pid, perf_ns__name(idx),
274                                              &ns_link_info[idx]);
275 
276         event->namespaces.header.type = PERF_RECORD_NAMESPACES;
277 
278         event->namespaces.header.size = (sizeof(event->namespaces) +
279                         (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
280                         machine->id_hdr_size);
281 
282         if (perf_tool__process_synth_event(tool, event, machine, process) != 0)
283                 return -1;
284 
285         return 0;
286 }
287 
288 static int perf_event__synthesize_fork(struct perf_tool *tool,
289                                        union perf_event *event,
290                                        pid_t pid, pid_t tgid, pid_t ppid,
291                                        perf_event__handler_t process,
292                                        struct machine *machine)
293 {
294         memset(&event->fork, 0, sizeof(event->fork) + machine->id_hdr_size);
295 
296         /*
297          * for main thread set parent to ppid from status file. For other
298          * threads set parent pid to main thread. ie., assume main thread
299          * spawns all threads in a process
300         */
301         if (tgid == pid) {
302                 event->fork.ppid = ppid;
303                 event->fork.ptid = ppid;
304         } else {
305                 event->fork.ppid = tgid;
306                 event->fork.ptid = tgid;
307         }
308         event->fork.pid  = tgid;
309         event->fork.tid  = pid;
310         event->fork.header.type = PERF_RECORD_FORK;
311         event->fork.header.misc = PERF_RECORD_MISC_FORK_EXEC;
312 
313         event->fork.header.size = (sizeof(event->fork) + machine->id_hdr_size);
314 
315         if (perf_tool__process_synth_event(tool, event, machine, process) != 0)
316                 return -1;
317 
318         return 0;
319 }
320 
321 int perf_event__synthesize_mmap_events(struct perf_tool *tool,
322                                        union perf_event *event,
323                                        pid_t pid, pid_t tgid,
324                                        perf_event__handler_t process,
325                                        struct machine *machine,
326                                        bool mmap_data,
327                                        unsigned int proc_map_timeout)
328 {
329         char filename[PATH_MAX];
330         FILE *fp;
331         unsigned long long t;
332         bool truncation = false;
333         unsigned long long timeout = proc_map_timeout * 1000000ULL;
334         int rc = 0;
335         const char *hugetlbfs_mnt = hugetlbfs__mountpoint();
336         int hugetlbfs_mnt_len = hugetlbfs_mnt ? strlen(hugetlbfs_mnt) : 0;
337 
338         if (machine__is_default_guest(machine))
339                 return 0;
340 
341         snprintf(filename, sizeof(filename), "%s/proc/%d/task/%d/maps",
342                  machine->root_dir, pid, pid);
343 
344         fp = fopen(filename, "r");
345         if (fp == NULL) {
346                 /*
347                  * We raced with a task exiting - just return:
348                  */
349                 pr_debug("couldn't open %s\n", filename);
350                 return -1;
351         }
352 
353         event->header.type = PERF_RECORD_MMAP2;
354         t = rdclock();
355 
356         while (1) {
357                 char bf[BUFSIZ];
358                 char prot[5];
359                 char execname[PATH_MAX];
360                 char anonstr[] = "//anon";
361                 unsigned int ino;
362                 size_t size;
363                 ssize_t n;
364 
365                 if (fgets(bf, sizeof(bf), fp) == NULL)
366                         break;
367 
368                 if ((rdclock() - t) > timeout) {
369                         pr_warning("Reading %s time out. "
370                                    "You may want to increase "
371                                    "the time limit by --proc-map-timeout\n",
372                                    filename);
373                         truncation = true;
374                         goto out;
375                 }
376 
377                 /* ensure null termination since stack will be reused. */
378                 strcpy(execname, "");
379 
380                 /* 00400000-0040c000 r-xp 00000000 fd:01 41038  /bin/cat */
381                 n = sscanf(bf, "%"PRIx64"-%"PRIx64" %s %"PRIx64" %x:%x %u %[^\n]\n",
382                        &event->mmap2.start, &event->mmap2.len, prot,
383                        &event->mmap2.pgoff, &event->mmap2.maj,
384                        &event->mmap2.min,
385                        &ino, execname);
386 
387                 /*
388                  * Anon maps don't have the execname.
389                  */
390                 if (n < 7)
391                         continue;
392 
393                 event->mmap2.ino = (u64)ino;
394 
395                 /*
396                  * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
397                  */
398                 if (machine__is_host(machine))
399                         event->header.misc = PERF_RECORD_MISC_USER;
400                 else
401                         event->header.misc = PERF_RECORD_MISC_GUEST_USER;
402 
403                 /* map protection and flags bits */
404                 event->mmap2.prot = 0;
405                 event->mmap2.flags = 0;
406                 if (prot[0] == 'r')
407                         event->mmap2.prot |= PROT_READ;
408                 if (prot[1] == 'w')
409                         event->mmap2.prot |= PROT_WRITE;
410                 if (prot[2] == 'x')
411                         event->mmap2.prot |= PROT_EXEC;
412 
413                 if (prot[3] == 's')
414                         event->mmap2.flags |= MAP_SHARED;
415                 else
416                         event->mmap2.flags |= MAP_PRIVATE;
417 
418                 if (prot[2] != 'x') {
419                         if (!mmap_data || prot[0] != 'r')
420                                 continue;
421 
422                         event->header.misc |= PERF_RECORD_MISC_MMAP_DATA;
423                 }
424 
425 out:
426                 if (truncation)
427                         event->header.misc |= PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT;
428 
429                 if (!strcmp(execname, ""))
430                         strcpy(execname, anonstr);
431 
432                 if (hugetlbfs_mnt_len &&
433                     !strncmp(execname, hugetlbfs_mnt, hugetlbfs_mnt_len)) {
434                         strcpy(execname, anonstr);
435                         event->mmap2.flags |= MAP_HUGETLB;
436                 }
437 
438                 size = strlen(execname) + 1;
439                 memcpy(event->mmap2.filename, execname, size);
440                 size = PERF_ALIGN(size, sizeof(u64));
441                 event->mmap2.len -= event->mmap.start;
442                 event->mmap2.header.size = (sizeof(event->mmap2) -
443                                         (sizeof(event->mmap2.filename) - size));
444                 memset(event->mmap2.filename + size, 0, machine->id_hdr_size);
445                 event->mmap2.header.size += machine->id_hdr_size;
446                 event->mmap2.pid = tgid;
447                 event->mmap2.tid = pid;
448 
449                 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) {
450                         rc = -1;
451                         break;
452                 }
453 
454                 if (truncation)
455                         break;
456         }
457 
458         fclose(fp);
459         return rc;
460 }
461 
462 int perf_event__synthesize_modules(struct perf_tool *tool,
463                                    perf_event__handler_t process,
464                                    struct machine *machine)
465 {
466         int rc = 0;
467         struct map *pos;
468         struct maps *maps = machine__kernel_maps(machine);
469         union perf_event *event = zalloc((sizeof(event->mmap) +
470                                           machine->id_hdr_size));
471         if (event == NULL) {
472                 pr_debug("Not enough memory synthesizing mmap event "
473                          "for kernel modules\n");
474                 return -1;
475         }
476 
477         event->header.type = PERF_RECORD_MMAP;
478 
479         /*
480          * kernel uses 0 for user space maps, see kernel/perf_event.c
481          * __perf_event_mmap
482          */
483         if (machine__is_host(machine))
484                 event->header.misc = PERF_RECORD_MISC_KERNEL;
485         else
486                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
487 
488         for (pos = maps__first(maps); pos; pos = map__next(pos)) {
489                 size_t size;
490 
491                 if (!__map__is_kmodule(pos))
492                         continue;
493 
494                 size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
495                 event->mmap.header.type = PERF_RECORD_MMAP;
496                 event->mmap.header.size = (sizeof(event->mmap) -
497                                         (sizeof(event->mmap.filename) - size));
498                 memset(event->mmap.filename + size, 0, machine->id_hdr_size);
499                 event->mmap.header.size += machine->id_hdr_size;
500                 event->mmap.start = pos->start;
501                 event->mmap.len   = pos->end - pos->start;
502                 event->mmap.pid   = machine->pid;
503 
504                 memcpy(event->mmap.filename, pos->dso->long_name,
505                        pos->dso->long_name_len + 1);
506                 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) {
507                         rc = -1;
508                         break;
509                 }
510         }
511 
512         free(event);
513         return rc;
514 }
515 
516 static int __event__synthesize_thread(union perf_event *comm_event,
517                                       union perf_event *mmap_event,
518                                       union perf_event *fork_event,
519                                       union perf_event *namespaces_event,
520                                       pid_t pid, int full,
521                                       perf_event__handler_t process,
522                                       struct perf_tool *tool,
523                                       struct machine *machine,
524                                       bool mmap_data,
525                                       unsigned int proc_map_timeout)
526 {
527         char filename[PATH_MAX];
528         DIR *tasks;
529         struct dirent *dirent;
530         pid_t tgid, ppid;
531         int rc = 0;
532 
533         /* special case: only send one comm event using passed in pid */
534         if (!full) {
535                 tgid = perf_event__synthesize_comm(tool, comm_event, pid,
536                                                    process, machine);
537 
538                 if (tgid == -1)
539                         return -1;
540 
541                 if (perf_event__synthesize_namespaces(tool, namespaces_event, pid,
542                                                       tgid, process, machine) < 0)
543                         return -1;
544 
545                 /*
546                  * send mmap only for thread group leader
547                  * see thread__init_map_groups
548                  */
549                 if (pid == tgid &&
550                     perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
551                                                        process, machine, mmap_data,
552                                                        proc_map_timeout))
553                         return -1;
554 
555                 return 0;
556         }
557 
558         if (machine__is_default_guest(machine))
559                 return 0;
560 
561         snprintf(filename, sizeof(filename), "%s/proc/%d/task",
562                  machine->root_dir, pid);
563 
564         tasks = opendir(filename);
565         if (tasks == NULL) {
566                 pr_debug("couldn't open %s\n", filename);
567                 return 0;
568         }
569 
570         while ((dirent = readdir(tasks)) != NULL) {
571                 char *end;
572                 pid_t _pid;
573 
574                 _pid = strtol(dirent->d_name, &end, 10);
575                 if (*end)
576                         continue;
577 
578                 rc = -1;
579                 if (perf_event__prepare_comm(comm_event, _pid, machine,
580                                              &tgid, &ppid) != 0)
581                         break;
582 
583                 if (perf_event__synthesize_fork(tool, fork_event, _pid, tgid,
584                                                 ppid, process, machine) < 0)
585                         break;
586 
587                 if (perf_event__synthesize_namespaces(tool, namespaces_event, _pid,
588                                                       tgid, process, machine) < 0)
589                         break;
590 
591                 /*
592                  * Send the prepared comm event
593                  */
594                 if (perf_tool__process_synth_event(tool, comm_event, machine, process) != 0)
595                         break;
596 
597                 rc = 0;
598                 if (_pid == pid) {
599                         /* process the parent's maps too */
600                         rc = perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
601                                                 process, machine, mmap_data, proc_map_timeout);
602                         if (rc)
603                                 break;
604                 }
605         }
606 
607         closedir(tasks);
608         return rc;
609 }
610 
611 int perf_event__synthesize_thread_map(struct perf_tool *tool,
612                                       struct thread_map *threads,
613                                       perf_event__handler_t process,
614                                       struct machine *machine,
615                                       bool mmap_data,
616                                       unsigned int proc_map_timeout)
617 {
618         union perf_event *comm_event, *mmap_event, *fork_event;
619         union perf_event *namespaces_event;
620         int err = -1, thread, j;
621 
622         comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
623         if (comm_event == NULL)
624                 goto out;
625 
626         mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
627         if (mmap_event == NULL)
628                 goto out_free_comm;
629 
630         fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
631         if (fork_event == NULL)
632                 goto out_free_mmap;
633 
634         namespaces_event = malloc(sizeof(namespaces_event->namespaces) +
635                                   (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
636                                   machine->id_hdr_size);
637         if (namespaces_event == NULL)
638                 goto out_free_fork;
639 
640         err = 0;
641         for (thread = 0; thread < threads->nr; ++thread) {
642                 if (__event__synthesize_thread(comm_event, mmap_event,
643                                                fork_event, namespaces_event,
644                                                thread_map__pid(threads, thread), 0,
645                                                process, tool, machine,
646                                                mmap_data, proc_map_timeout)) {
647                         err = -1;
648                         break;
649                 }
650 
651                 /*
652                  * comm.pid is set to thread group id by
653                  * perf_event__synthesize_comm
654                  */
655                 if ((int) comm_event->comm.pid != thread_map__pid(threads, thread)) {
656                         bool need_leader = true;
657 
658                         /* is thread group leader in thread_map? */
659                         for (j = 0; j < threads->nr; ++j) {
660                                 if ((int) comm_event->comm.pid == thread_map__pid(threads, j)) {
661                                         need_leader = false;
662                                         break;
663                                 }
664                         }
665 
666                         /* if not, generate events for it */
667                         if (need_leader &&
668                             __event__synthesize_thread(comm_event, mmap_event,
669                                                        fork_event, namespaces_event,
670                                                        comm_event->comm.pid, 0,
671                                                        process, tool, machine,
672                                                        mmap_data, proc_map_timeout)) {
673                                 err = -1;
674                                 break;
675                         }
676                 }
677         }
678         free(namespaces_event);
679 out_free_fork:
680         free(fork_event);
681 out_free_mmap:
682         free(mmap_event);
683 out_free_comm:
684         free(comm_event);
685 out:
686         return err;
687 }
688 
689 static int __perf_event__synthesize_threads(struct perf_tool *tool,
690                                             perf_event__handler_t process,
691                                             struct machine *machine,
692                                             bool mmap_data,
693                                             unsigned int proc_map_timeout,
694                                             struct dirent **dirent,
695                                             int start,
696                                             int num)
697 {
698         union perf_event *comm_event, *mmap_event, *fork_event;
699         union perf_event *namespaces_event;
700         int err = -1;
701         char *end;
702         pid_t pid;
703         int i;
704 
705         comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
706         if (comm_event == NULL)
707                 goto out;
708 
709         mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
710         if (mmap_event == NULL)
711                 goto out_free_comm;
712 
713         fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
714         if (fork_event == NULL)
715                 goto out_free_mmap;
716 
717         namespaces_event = malloc(sizeof(namespaces_event->namespaces) +
718                                   (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
719                                   machine->id_hdr_size);
720         if (namespaces_event == NULL)
721                 goto out_free_fork;
722 
723         for (i = start; i < start + num; i++) {
724                 if (!isdigit(dirent[i]->d_name[0]))
725                         continue;
726 
727                 pid = (pid_t)strtol(dirent[i]->d_name, &end, 10);
728                 /* only interested in proper numerical dirents */
729                 if (*end)
730                         continue;
731                 /*
732                  * We may race with exiting thread, so don't stop just because
733                  * one thread couldn't be synthesized.
734                  */
735                 __event__synthesize_thread(comm_event, mmap_event, fork_event,
736                                            namespaces_event, pid, 1, process,
737                                            tool, machine, mmap_data,
738                                            proc_map_timeout);
739         }
740         err = 0;
741 
742         free(namespaces_event);
743 out_free_fork:
744         free(fork_event);
745 out_free_mmap:
746         free(mmap_event);
747 out_free_comm:
748         free(comm_event);
749 out:
750         return err;
751 }
752 
753 struct synthesize_threads_arg {
754         struct perf_tool *tool;
755         perf_event__handler_t process;
756         struct machine *machine;
757         bool mmap_data;
758         unsigned int proc_map_timeout;
759         struct dirent **dirent;
760         int num;
761         int start;
762 };
763 
764 static void *synthesize_threads_worker(void *arg)
765 {
766         struct synthesize_threads_arg *args = arg;
767 
768         __perf_event__synthesize_threads(args->tool, args->process,
769                                          args->machine, args->mmap_data,
770                                          args->proc_map_timeout, args->dirent,
771                                          args->start, args->num);
772         return NULL;
773 }
774 
775 int perf_event__synthesize_threads(struct perf_tool *tool,
776                                    perf_event__handler_t process,
777                                    struct machine *machine,
778                                    bool mmap_data,
779                                    unsigned int proc_map_timeout,
780                                    unsigned int nr_threads_synthesize)
781 {
782         struct synthesize_threads_arg *args = NULL;
783         pthread_t *synthesize_threads = NULL;
784         char proc_path[PATH_MAX];
785         struct dirent **dirent;
786         int num_per_thread;
787         int m, n, i, j;
788         int thread_nr;
789         int base = 0;
790         int err = -1;
791 
792 
793         if (machine__is_default_guest(machine))
794                 return 0;
795 
796         snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir);
797         n = scandir(proc_path, &dirent, 0, alphasort);
798         if (n < 0)
799                 return err;
800 
801         if (nr_threads_synthesize == UINT_MAX)
802                 thread_nr = sysconf(_SC_NPROCESSORS_ONLN);
803         else
804                 thread_nr = nr_threads_synthesize;
805 
806         if (thread_nr <= 1) {
807                 err = __perf_event__synthesize_threads(tool, process,
808                                                        machine, mmap_data,
809                                                        proc_map_timeout,
810                                                        dirent, base, n);
811                 goto free_dirent;
812         }
813         if (thread_nr > n)
814                 thread_nr = n;
815 
816         synthesize_threads = calloc(sizeof(pthread_t), thread_nr);
817         if (synthesize_threads == NULL)
818                 goto free_dirent;
819 
820         args = calloc(sizeof(*args), thread_nr);
821         if (args == NULL)
822                 goto free_threads;
823 
824         num_per_thread = n / thread_nr;
825         m = n % thread_nr;
826         for (i = 0; i < thread_nr; i++) {
827                 args[i].tool = tool;
828                 args[i].process = process;
829                 args[i].machine = machine;
830                 args[i].mmap_data = mmap_data;
831                 args[i].proc_map_timeout = proc_map_timeout;
832                 args[i].dirent = dirent;
833         }
834         for (i = 0; i < m; i++) {
835                 args[i].num = num_per_thread + 1;
836                 args[i].start = i * args[i].num;
837         }
838         if (i != 0)
839                 base = args[i-1].start + args[i-1].num;
840         for (j = i; j < thread_nr; j++) {
841                 args[j].num = num_per_thread;
842                 args[j].start = base + (j - i) * args[i].num;
843         }
844 
845         for (i = 0; i < thread_nr; i++) {
846                 if (pthread_create(&synthesize_threads[i], NULL,
847                                    synthesize_threads_worker, &args[i]))
848                         goto out_join;
849         }
850         err = 0;
851 out_join:
852         for (i = 0; i < thread_nr; i++)
853                 pthread_join(synthesize_threads[i], NULL);
854         free(args);
855 free_threads:
856         free(synthesize_threads);
857 free_dirent:
858         for (i = 0; i < n; i++)
859                 free(dirent[i]);
860         free(dirent);
861 
862         return err;
863 }
864 
865 struct process_symbol_args {
866         const char *name;
867         u64        start;
868 };
869 
870 static int find_symbol_cb(void *arg, const char *name, char type,
871                           u64 start)
872 {
873         struct process_symbol_args *args = arg;
874 
875         /*
876          * Must be a function or at least an alias, as in PARISC64, where "_text" is
877          * an 'A' to the same address as "_stext".
878          */
879         if (!(kallsyms__is_function(type) ||
880               type == 'A') || strcmp(name, args->name))
881                 return 0;
882 
883         args->start = start;
884         return 1;
885 }
886 
887 int kallsyms__get_function_start(const char *kallsyms_filename,
888                                  const char *symbol_name, u64 *addr)
889 {
890         struct process_symbol_args args = { .name = symbol_name, };
891 
892         if (kallsyms__parse(kallsyms_filename, &args, find_symbol_cb) <= 0)
893                 return -1;
894 
895         *addr = args.start;
896         return 0;
897 }
898 
899 int __weak perf_event__synthesize_extra_kmaps(struct perf_tool *tool __maybe_unused,
900                                               perf_event__handler_t process __maybe_unused,
901                                               struct machine *machine __maybe_unused)
902 {
903         return 0;
904 }
905 
906 static int __perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
907                                                 perf_event__handler_t process,
908                                                 struct machine *machine)
909 {
910         size_t size;
911         struct map *map = machine__kernel_map(machine);
912         struct kmap *kmap;
913         int err;
914         union perf_event *event;
915 
916         if (symbol_conf.kptr_restrict)
917                 return -1;
918         if (map == NULL)
919                 return -1;
920 
921         /*
922          * We should get this from /sys/kernel/sections/.text, but till that is
923          * available use this, and after it is use this as a fallback for older
924          * kernels.
925          */
926         event = zalloc((sizeof(event->mmap) + machine->id_hdr_size));
927         if (event == NULL) {
928                 pr_debug("Not enough memory synthesizing mmap event "
929                          "for kernel modules\n");
930                 return -1;
931         }
932 
933         if (machine__is_host(machine)) {
934                 /*
935                  * kernel uses PERF_RECORD_MISC_USER for user space maps,
936                  * see kernel/perf_event.c __perf_event_mmap
937                  */
938                 event->header.misc = PERF_RECORD_MISC_KERNEL;
939         } else {
940                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
941         }
942 
943         kmap = map__kmap(map);
944         size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
945                         "%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1;
946         size = PERF_ALIGN(size, sizeof(u64));
947         event->mmap.header.type = PERF_RECORD_MMAP;
948         event->mmap.header.size = (sizeof(event->mmap) -
949                         (sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
950         event->mmap.pgoff = kmap->ref_reloc_sym->addr;
951         event->mmap.start = map->start;
952         event->mmap.len   = map->end - event->mmap.start;
953         event->mmap.pid   = machine->pid;
954 
955         err = perf_tool__process_synth_event(tool, event, machine, process);
956         free(event);
957 
958         return err;
959 }
960 
961 int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
962                                        perf_event__handler_t process,
963                                        struct machine *machine)
964 {
965         int err;
966 
967         err = __perf_event__synthesize_kernel_mmap(tool, process, machine);
968         if (err < 0)
969                 return err;
970 
971         return perf_event__synthesize_extra_kmaps(tool, process, machine);
972 }
973 
974 int perf_event__synthesize_thread_map2(struct perf_tool *tool,
975                                       struct thread_map *threads,
976                                       perf_event__handler_t process,
977                                       struct machine *machine)
978 {
979         union perf_event *event;
980         int i, err, size;
981 
982         size  = sizeof(event->thread_map);
983         size += threads->nr * sizeof(event->thread_map.entries[0]);
984 
985         event = zalloc(size);
986         if (!event)
987                 return -ENOMEM;
988 
989         event->header.type = PERF_RECORD_THREAD_MAP;
990         event->header.size = size;
991         event->thread_map.nr = threads->nr;
992 
993         for (i = 0; i < threads->nr; i++) {
994                 struct thread_map_event_entry *entry = &event->thread_map.entries[i];
995                 char *comm = thread_map__comm(threads, i);
996 
997                 if (!comm)
998                         comm = (char *) "";
999 
1000                 entry->pid = thread_map__pid(threads, i);
1001                 strncpy((char *) &entry->comm, comm, sizeof(entry->comm));
1002         }
1003 
1004         err = process(tool, event, NULL, machine);
1005 
1006         free(event);
1007         return err;
1008 }
1009 
1010 static void synthesize_cpus(struct cpu_map_entries *cpus,
1011                             struct cpu_map *map)
1012 {
1013         int i;
1014 
1015         cpus->nr = map->nr;
1016 
1017         for (i = 0; i < map->nr; i++)
1018                 cpus->cpu[i] = map->map[i];
1019 }
1020 
1021 static void synthesize_mask(struct cpu_map_mask *mask,
1022                             struct cpu_map *map, int max)
1023 {
1024         int i;
1025 
1026         mask->nr = BITS_TO_LONGS(max);
1027         mask->long_size = sizeof(long);
1028 
1029         for (i = 0; i < map->nr; i++)
1030                 set_bit(map->map[i], mask->mask);
1031 }
1032 
1033 static size_t cpus_size(struct cpu_map *map)
1034 {
1035         return sizeof(struct cpu_map_entries) + map->nr * sizeof(u16);
1036 }
1037 
1038 static size_t mask_size(struct cpu_map *map, int *max)
1039 {
1040         int i;
1041 
1042         *max = 0;
1043 
1044         for (i = 0; i < map->nr; i++) {
1045                 /* bit possition of the cpu is + 1 */
1046                 int bit = map->map[i] + 1;
1047 
1048                 if (bit > *max)
1049                         *max = bit;
1050         }
1051 
1052         return sizeof(struct cpu_map_mask) + BITS_TO_LONGS(*max) * sizeof(long);
1053 }
1054 
1055 void *cpu_map_data__alloc(struct cpu_map *map, size_t *size, u16 *type, int *max)
1056 {
1057         size_t size_cpus, size_mask;
1058         bool is_dummy = cpu_map__empty(map);
1059 
1060         /*
1061          * Both array and mask data have variable size based
1062          * on the number of cpus and their actual values.
1063          * The size of the 'struct cpu_map_data' is:
1064          *
1065          *   array = size of 'struct cpu_map_entries' +
1066          *           number of cpus * sizeof(u64)
1067          *
1068          *   mask  = size of 'struct cpu_map_mask' +
1069          *           maximum cpu bit converted to size of longs
1070          *
1071          * and finaly + the size of 'struct cpu_map_data'.
1072          */
1073         size_cpus = cpus_size(map);
1074         size_mask = mask_size(map, max);
1075 
1076         if (is_dummy || (size_cpus < size_mask)) {
1077                 *size += size_cpus;
1078                 *type  = PERF_CPU_MAP__CPUS;
1079         } else {
1080                 *size += size_mask;
1081                 *type  = PERF_CPU_MAP__MASK;
1082         }
1083 
1084         *size += sizeof(struct cpu_map_data);
1085         *size = PERF_ALIGN(*size, sizeof(u64));
1086         return zalloc(*size);
1087 }
1088 
1089 void cpu_map_data__synthesize(struct cpu_map_data *data, struct cpu_map *map,
1090                               u16 type, int max)
1091 {
1092         data->type = type;
1093 
1094         switch (type) {
1095         case PERF_CPU_MAP__CPUS:
1096                 synthesize_cpus((struct cpu_map_entries *) data->data, map);
1097                 break;
1098         case PERF_CPU_MAP__MASK:
1099                 synthesize_mask((struct cpu_map_mask *) data->data, map, max);
1100         default:
1101                 break;
1102         };
1103 }
1104 
1105 static struct cpu_map_event* cpu_map_event__new(struct cpu_map *map)
1106 {
1107         size_t size = sizeof(struct cpu_map_event);
1108         struct cpu_map_event *event;
1109         int max;
1110         u16 type;
1111 
1112         event = cpu_map_data__alloc(map, &size, &type, &max);
1113         if (!event)
1114                 return NULL;
1115 
1116         event->header.type = PERF_RECORD_CPU_MAP;
1117         event->header.size = size;
1118         event->data.type   = type;
1119 
1120         cpu_map_data__synthesize(&event->data, map, type, max);
1121         return event;
1122 }
1123 
1124 int perf_event__synthesize_cpu_map(struct perf_tool *tool,
1125                                    struct cpu_map *map,
1126                                    perf_event__handler_t process,
1127                                    struct machine *machine)
1128 {
1129         struct cpu_map_event *event;
1130         int err;
1131 
1132         event = cpu_map_event__new(map);
1133         if (!event)
1134                 return -ENOMEM;
1135 
1136         err = process(tool, (union perf_event *) event, NULL, machine);
1137 
1138         free(event);
1139         return err;
1140 }
1141 
1142 int perf_event__synthesize_stat_config(struct perf_tool *tool,
1143                                        struct perf_stat_config *config,
1144                                        perf_event__handler_t process,
1145                                        struct machine *machine)
1146 {
1147         struct stat_config_event *event;
1148         int size, i = 0, err;
1149 
1150         size  = sizeof(*event);
1151         size += (PERF_STAT_CONFIG_TERM__MAX * sizeof(event->data[0]));
1152 
1153         event = zalloc(size);
1154         if (!event)
1155                 return -ENOMEM;
1156 
1157         event->header.type = PERF_RECORD_STAT_CONFIG;
1158         event->header.size = size;
1159         event->nr          = PERF_STAT_CONFIG_TERM__MAX;
1160 
1161 #define ADD(__term, __val)                                      \
1162         event->data[i].tag = PERF_STAT_CONFIG_TERM__##__term;   \
1163         event->data[i].val = __val;                             \
1164         i++;
1165 
1166         ADD(AGGR_MODE,  config->aggr_mode)
1167         ADD(INTERVAL,   config->interval)
1168         ADD(SCALE,      config->scale)
1169 
1170         WARN_ONCE(i != PERF_STAT_CONFIG_TERM__MAX,
1171                   "stat config terms unbalanced\n");
1172 #undef ADD
1173 
1174         err = process(tool, (union perf_event *) event, NULL, machine);
1175 
1176         free(event);
1177         return err;
1178 }
1179 
1180 int perf_event__synthesize_stat(struct perf_tool *tool,
1181                                 u32 cpu, u32 thread, u64 id,
1182                                 struct perf_counts_values *count,
1183                                 perf_event__handler_t process,
1184                                 struct machine *machine)
1185 {
1186         struct stat_event event;
1187 
1188         event.header.type = PERF_RECORD_STAT;
1189         event.header.size = sizeof(event);
1190         event.header.misc = 0;
1191 
1192         event.id        = id;
1193         event.cpu       = cpu;
1194         event.thread    = thread;
1195         event.val       = count->val;
1196         event.ena       = count->ena;
1197         event.run       = count->run;
1198 
1199         return process(tool, (union perf_event *) &event, NULL, machine);
1200 }
1201 
1202 int perf_event__synthesize_stat_round(struct perf_tool *tool,
1203                                       u64 evtime, u64 type,
1204                                       perf_event__handler_t process,
1205                                       struct machine *machine)
1206 {
1207         struct stat_round_event event;
1208 
1209         event.header.type = PERF_RECORD_STAT_ROUND;
1210         event.header.size = sizeof(event);
1211         event.header.misc = 0;
1212 
1213         event.time = evtime;
1214         event.type = type;
1215 
1216         return process(tool, (union perf_event *) &event, NULL, machine);
1217 }
1218 
1219 void perf_event__read_stat_config(struct perf_stat_config *config,
1220                                   struct stat_config_event *event)
1221 {
1222         unsigned i;
1223 
1224         for (i = 0; i < event->nr; i++) {
1225 
1226                 switch (event->data[i].tag) {
1227 #define CASE(__term, __val)                                     \
1228                 case PERF_STAT_CONFIG_TERM__##__term:           \
1229                         config->__val = event->data[i].val;     \
1230                         break;
1231 
1232                 CASE(AGGR_MODE, aggr_mode)
1233                 CASE(SCALE,     scale)
1234                 CASE(INTERVAL,  interval)
1235 #undef CASE
1236                 default:
1237                         pr_warning("unknown stat config term %" PRIu64 "\n",
1238                                    event->data[i].tag);
1239                 }
1240         }
1241 }
1242 
1243 size_t perf_event__fprintf_comm(union perf_event *event, FILE *fp)
1244 {
1245         const char *s;
1246 
1247         if (event->header.misc & PERF_RECORD_MISC_COMM_EXEC)
1248                 s = " exec";
1249         else
1250                 s = "";
1251 
1252         return fprintf(fp, "%s: %s:%d/%d\n", s, event->comm.comm, event->comm.pid, event->comm.tid);
1253 }
1254 
1255 size_t perf_event__fprintf_namespaces(union perf_event *event, FILE *fp)
1256 {
1257         size_t ret = 0;
1258         struct perf_ns_link_info *ns_link_info;
1259         u32 nr_namespaces, idx;
1260 
1261         ns_link_info = event->namespaces.link_info;
1262         nr_namespaces = event->namespaces.nr_namespaces;
1263 
1264         ret += fprintf(fp, " %d/%d - nr_namespaces: %u\n\t\t[",
1265                        event->namespaces.pid,
1266                        event->namespaces.tid,
1267                        nr_namespaces);
1268 
1269         for (idx = 0; idx < nr_namespaces; idx++) {
1270                 if (idx && (idx % 4 == 0))
1271                         ret += fprintf(fp, "\n\t\t ");
1272 
1273                 ret  += fprintf(fp, "%u/%s: %" PRIu64 "/%#" PRIx64 "%s", idx,
1274                                 perf_ns__name(idx), (u64)ns_link_info[idx].dev,
1275                                 (u64)ns_link_info[idx].ino,
1276                                 ((idx + 1) != nr_namespaces) ? ", " : "]\n");
1277         }
1278 
1279         return ret;
1280 }
1281 
1282 int perf_event__process_comm(struct perf_tool *tool __maybe_unused,
1283                              union perf_event *event,
1284                              struct perf_sample *sample,
1285                              struct machine *machine)
1286 {
1287         return machine__process_comm_event(machine, event, sample);
1288 }
1289 
1290 int perf_event__process_namespaces(struct perf_tool *tool __maybe_unused,
1291                                    union perf_event *event,
1292                                    struct perf_sample *sample,
1293                                    struct machine *machine)
1294 {
1295         return machine__process_namespaces_event(machine, event, sample);
1296 }
1297 
1298 int perf_event__process_lost(struct perf_tool *tool __maybe_unused,
1299                              union perf_event *event,
1300                              struct perf_sample *sample,
1301                              struct machine *machine)
1302 {
1303         return machine__process_lost_event(machine, event, sample);
1304 }
1305 
1306 int perf_event__process_aux(struct perf_tool *tool __maybe_unused,
1307                             union perf_event *event,
1308                             struct perf_sample *sample __maybe_unused,
1309                             struct machine *machine)
1310 {
1311         return machine__process_aux_event(machine, event);
1312 }
1313 
1314 int perf_event__process_itrace_start(struct perf_tool *tool __maybe_unused,
1315                                      union perf_event *event,
1316                                      struct perf_sample *sample __maybe_unused,
1317                                      struct machine *machine)
1318 {
1319         return machine__process_itrace_start_event(machine, event);
1320 }
1321 
1322 int perf_event__process_lost_samples(struct perf_tool *tool __maybe_unused,
1323                                      union perf_event *event,
1324                                      struct perf_sample *sample,
1325                                      struct machine *machine)
1326 {
1327         return machine__process_lost_samples_event(machine, event, sample);
1328 }
1329 
1330 int perf_event__process_switch(struct perf_tool *tool __maybe_unused,
1331                                union perf_event *event,
1332                                struct perf_sample *sample __maybe_unused,
1333                                struct machine *machine)
1334 {
1335         return machine__process_switch_event(machine, event);
1336 }
1337 
1338 size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp)
1339 {
1340         return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64 "]: %c %s\n",
1341                        event->mmap.pid, event->mmap.tid, event->mmap.start,
1342                        event->mmap.len, event->mmap.pgoff,
1343                        (event->header.misc & PERF_RECORD_MISC_MMAP_DATA) ? 'r' : 'x',
1344                        event->mmap.filename);
1345 }
1346 
1347 size_t perf_event__fprintf_mmap2(union perf_event *event, FILE *fp)
1348 {
1349         return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64
1350                            " %02x:%02x %"PRIu64" %"PRIu64"]: %c%c%c%c %s\n",
1351                        event->mmap2.pid, event->mmap2.tid, event->mmap2.start,
1352                        event->mmap2.len, event->mmap2.pgoff, event->mmap2.maj,
1353                        event->mmap2.min, event->mmap2.ino,
1354                        event->mmap2.ino_generation,
1355                        (event->mmap2.prot & PROT_READ) ? 'r' : '-',
1356                        (event->mmap2.prot & PROT_WRITE) ? 'w' : '-',
1357                        (event->mmap2.prot & PROT_EXEC) ? 'x' : '-',
1358                        (event->mmap2.flags & MAP_SHARED) ? 's' : 'p',
1359                        event->mmap2.filename);
1360 }
1361 
1362 size_t perf_event__fprintf_thread_map(union perf_event *event, FILE *fp)
1363 {
1364         struct thread_map *threads = thread_map__new_event(&event->thread_map);
1365         size_t ret;
1366 
1367         ret = fprintf(fp, " nr: ");
1368 
1369         if (threads)
1370                 ret += thread_map__fprintf(threads, fp);
1371         else
1372                 ret += fprintf(fp, "failed to get threads from event\n");
1373 
1374         thread_map__put(threads);
1375         return ret;
1376 }
1377 
1378 size_t perf_event__fprintf_cpu_map(union perf_event *event, FILE *fp)
1379 {
1380         struct cpu_map *cpus = cpu_map__new_data(&event->cpu_map.data);
1381         size_t ret;
1382 
1383         ret = fprintf(fp, ": ");
1384 
1385         if (cpus)
1386                 ret += cpu_map__fprintf(cpus, fp);
1387         else
1388                 ret += fprintf(fp, "failed to get cpumap from event\n");
1389 
1390         cpu_map__put(cpus);
1391         return ret;
1392 }
1393 
1394 int perf_event__process_mmap(struct perf_tool *tool __maybe_unused,
1395                              union perf_event *event,
1396                              struct perf_sample *sample,
1397                              struct machine *machine)
1398 {
1399         return machine__process_mmap_event(machine, event, sample);
1400 }
1401 
1402 int perf_event__process_mmap2(struct perf_tool *tool __maybe_unused,
1403                              union perf_event *event,
1404                              struct perf_sample *sample,
1405                              struct machine *machine)
1406 {
1407         return machine__process_mmap2_event(machine, event, sample);
1408 }
1409 
1410 size_t perf_event__fprintf_task(union perf_event *event, FILE *fp)
1411 {
1412         return fprintf(fp, "(%d:%d):(%d:%d)\n",
1413                        event->fork.pid, event->fork.tid,
1414                        event->fork.ppid, event->fork.ptid);
1415 }
1416 
1417 int perf_event__process_fork(struct perf_tool *tool __maybe_unused,
1418                              union perf_event *event,
1419                              struct perf_sample *sample,
1420                              struct machine *machine)
1421 {
1422         return machine__process_fork_event(machine, event, sample);
1423 }
1424 
1425 int perf_event__process_exit(struct perf_tool *tool __maybe_unused,
1426                              union perf_event *event,
1427                              struct perf_sample *sample,
1428                              struct machine *machine)
1429 {
1430         return machine__process_exit_event(machine, event, sample);
1431 }
1432 
1433 size_t perf_event__fprintf_aux(union perf_event *event, FILE *fp)
1434 {
1435         return fprintf(fp, " offset: %#"PRIx64" size: %#"PRIx64" flags: %#"PRIx64" [%s%s%s]\n",
1436                        event->aux.aux_offset, event->aux.aux_size,
1437                        event->aux.flags,
1438                        event->aux.flags & PERF_AUX_FLAG_TRUNCATED ? "T" : "",
1439                        event->aux.flags & PERF_AUX_FLAG_OVERWRITE ? "O" : "",
1440                        event->aux.flags & PERF_AUX_FLAG_PARTIAL   ? "P" : "");
1441 }
1442 
1443 size_t perf_event__fprintf_itrace_start(union perf_event *event, FILE *fp)
1444 {
1445         return fprintf(fp, " pid: %u tid: %u\n",
1446                        event->itrace_start.pid, event->itrace_start.tid);
1447 }
1448 
1449 size_t perf_event__fprintf_switch(union perf_event *event, FILE *fp)
1450 {
1451         bool out = event->header.misc & PERF_RECORD_MISC_SWITCH_OUT;
1452         const char *in_out = !out ? "IN         " :
1453                 !(event->header.misc & PERF_RECORD_MISC_SWITCH_OUT_PREEMPT) ?
1454                                     "OUT        " : "OUT preempt";
1455 
1456         if (event->header.type == PERF_RECORD_SWITCH)
1457                 return fprintf(fp, " %s\n", in_out);
1458 
1459         return fprintf(fp, " %s  %s pid/tid: %5u/%-5u\n",
1460                        in_out, out ? "next" : "prev",
1461                        event->context_switch.next_prev_pid,
1462                        event->context_switch.next_prev_tid);
1463 }
1464 
1465 static size_t perf_event__fprintf_lost(union perf_event *event, FILE *fp)
1466 {
1467         return fprintf(fp, " lost %" PRIu64 "\n", event->lost.lost);
1468 }
1469 
1470 size_t perf_event__fprintf(union perf_event *event, FILE *fp)
1471 {
1472         size_t ret = fprintf(fp, "PERF_RECORD_%s",
1473                              perf_event__name(event->header.type));
1474 
1475         switch (event->header.type) {
1476         case PERF_RECORD_COMM:
1477                 ret += perf_event__fprintf_comm(event, fp);
1478                 break;
1479         case PERF_RECORD_FORK:
1480         case PERF_RECORD_EXIT:
1481                 ret += perf_event__fprintf_task(event, fp);
1482                 break;
1483         case PERF_RECORD_MMAP:
1484                 ret += perf_event__fprintf_mmap(event, fp);
1485                 break;
1486         case PERF_RECORD_NAMESPACES:
1487                 ret += perf_event__fprintf_namespaces(event, fp);
1488                 break;
1489         case PERF_RECORD_MMAP2:
1490                 ret += perf_event__fprintf_mmap2(event, fp);
1491                 break;
1492         case PERF_RECORD_AUX:
1493                 ret += perf_event__fprintf_aux(event, fp);
1494                 break;
1495         case PERF_RECORD_ITRACE_START:
1496                 ret += perf_event__fprintf_itrace_start(event, fp);
1497                 break;
1498         case PERF_RECORD_SWITCH:
1499         case PERF_RECORD_SWITCH_CPU_WIDE:
1500                 ret += perf_event__fprintf_switch(event, fp);
1501                 break;
1502         case PERF_RECORD_LOST:
1503                 ret += perf_event__fprintf_lost(event, fp);
1504                 break;
1505         default:
1506                 ret += fprintf(fp, "\n");
1507         }
1508 
1509         return ret;
1510 }
1511 
1512 int perf_event__process(struct perf_tool *tool __maybe_unused,
1513                         union perf_event *event,
1514                         struct perf_sample *sample,
1515                         struct machine *machine)
1516 {
1517         return machine__process_event(machine, event, sample);
1518 }
1519 
1520 struct map *thread__find_map(struct thread *thread, u8 cpumode, u64 addr,
1521                              struct addr_location *al)
1522 {
1523         struct map_groups *mg = thread->mg;
1524         struct machine *machine = mg->machine;
1525         bool load_map = false;
1526 
1527         al->machine = machine;
1528         al->thread = thread;
1529         al->addr = addr;
1530         al->cpumode = cpumode;
1531         al->filtered = 0;
1532 
1533         if (machine == NULL) {
1534                 al->map = NULL;
1535                 return NULL;
1536         }
1537 
1538         if (cpumode == PERF_RECORD_MISC_KERNEL && perf_host) {
1539                 al->level = 'k';
1540                 mg = &machine->kmaps;
1541                 load_map = true;
1542         } else if (cpumode == PERF_RECORD_MISC_USER && perf_host) {
1543                 al->level = '.';
1544         } else if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) {
1545                 al->level = 'g';
1546                 mg = &machine->kmaps;
1547                 load_map = true;
1548         } else if (cpumode == PERF_RECORD_MISC_GUEST_USER && perf_guest) {
1549                 al->level = 'u';
1550         } else {
1551                 al->level = 'H';
1552                 al->map = NULL;
1553 
1554                 if ((cpumode == PERF_RECORD_MISC_GUEST_USER ||
1555                         cpumode == PERF_RECORD_MISC_GUEST_KERNEL) &&
1556                         !perf_guest)
1557                         al->filtered |= (1 << HIST_FILTER__GUEST);
1558                 if ((cpumode == PERF_RECORD_MISC_USER ||
1559                         cpumode == PERF_RECORD_MISC_KERNEL) &&
1560                         !perf_host)
1561                         al->filtered |= (1 << HIST_FILTER__HOST);
1562 
1563                 return NULL;
1564         }
1565 
1566         al->map = map_groups__find(mg, al->addr);
1567         if (al->map != NULL) {
1568                 /*
1569                  * Kernel maps might be changed when loading symbols so loading
1570                  * must be done prior to using kernel maps.
1571                  */
1572                 if (load_map)
1573                         map__load(al->map);
1574                 al->addr = al->map->map_ip(al->map, al->addr);
1575         }
1576 
1577         return al->map;
1578 }
1579 
1580 /*
1581  * For branch stacks or branch samples, the sample cpumode might not be correct
1582  * because it applies only to the sample 'ip' and not necessary to 'addr' or
1583  * branch stack addresses. If possible, use a fallback to deal with those cases.
1584  */
1585 struct map *thread__find_map_fb(struct thread *thread, u8 cpumode, u64 addr,
1586                                 struct addr_location *al)
1587 {
1588         struct map *map = thread__find_map(thread, cpumode, addr, al);
1589         struct machine *machine = thread->mg->machine;
1590         u8 addr_cpumode = machine__addr_cpumode(machine, cpumode, addr);
1591 
1592         if (map || addr_cpumode == cpumode)
1593                 return map;
1594 
1595         return thread__find_map(thread, addr_cpumode, addr, al);
1596 }
1597 
1598 struct symbol *thread__find_symbol(struct thread *thread, u8 cpumode,
1599                                    u64 addr, struct addr_location *al)
1600 {
1601         al->sym = NULL;
1602         if (thread__find_map(thread, cpumode, addr, al))
1603                 al->sym = map__find_symbol(al->map, al->addr);
1604         return al->sym;
1605 }
1606 
1607 struct symbol *thread__find_symbol_fb(struct thread *thread, u8 cpumode,
1608                                       u64 addr, struct addr_location *al)
1609 {
1610         al->sym = NULL;
1611         if (thread__find_map_fb(thread, cpumode, addr, al))
1612                 al->sym = map__find_symbol(al->map, al->addr);
1613         return al->sym;
1614 }
1615 
1616 /*
1617  * Callers need to drop the reference to al->thread, obtained in
1618  * machine__findnew_thread()
1619  */
1620 int machine__resolve(struct machine *machine, struct addr_location *al,
1621                      struct perf_sample *sample)
1622 {
1623         struct thread *thread = machine__findnew_thread(machine, sample->pid,
1624                                                         sample->tid);
1625 
1626         if (thread == NULL)
1627                 return -1;
1628 
1629         dump_printf(" ... thread: %s:%d\n", thread__comm_str(thread), thread->tid);
1630         thread__find_map(thread, sample->cpumode, sample->ip, al);
1631         dump_printf(" ...... dso: %s\n",
1632                     al->map ? al->map->dso->long_name :
1633                         al->level == 'H' ? "[hypervisor]" : "<not found>");
1634 
1635         if (thread__is_filtered(thread))
1636                 al->filtered |= (1 << HIST_FILTER__THREAD);
1637 
1638         al->sym = NULL;
1639         al->cpu = sample->cpu;
1640         al->socket = -1;
1641         al->srcline = NULL;
1642 
1643         if (al->cpu >= 0) {
1644                 struct perf_env *env = machine->env;
1645 
1646                 if (env && env->cpu)
1647                         al->socket = env->cpu[al->cpu].socket_id;
1648         }
1649 
1650         if (al->map) {
1651                 struct dso *dso = al->map->dso;
1652 
1653                 if (symbol_conf.dso_list &&
1654                     (!dso || !(strlist__has_entry(symbol_conf.dso_list,
1655                                                   dso->short_name) ||
1656                                (dso->short_name != dso->long_name &&
1657                                 strlist__has_entry(symbol_conf.dso_list,
1658                                                    dso->long_name))))) {
1659                         al->filtered |= (1 << HIST_FILTER__DSO);
1660                 }
1661 
1662                 al->sym = map__find_symbol(al->map, al->addr);
1663         }
1664 
1665         if (symbol_conf.sym_list &&
1666                 (!al->sym || !strlist__has_entry(symbol_conf.sym_list,
1667                                                 al->sym->name))) {
1668                 al->filtered |= (1 << HIST_FILTER__SYMBOL);
1669         }
1670 
1671         return 0;
1672 }
1673 
1674 /*
1675  * The preprocess_sample method will return with reference counts for the
1676  * in it, when done using (and perhaps getting ref counts if needing to
1677  * keep a pointer to one of those entries) it must be paired with
1678  * addr_location__put(), so that the refcounts can be decremented.
1679  */
1680 void addr_location__put(struct addr_location *al)
1681 {
1682         thread__zput(al->thread);
1683 }
1684 
1685 bool is_bts_event(struct perf_event_attr *attr)
1686 {
1687         return attr->type == PERF_TYPE_HARDWARE &&
1688                (attr->config & PERF_COUNT_HW_BRANCH_INSTRUCTIONS) &&
1689                attr->sample_period == 1;
1690 }
1691 
1692 bool sample_addr_correlates_sym(struct perf_event_attr *attr)
1693 {
1694         if (attr->type == PERF_TYPE_SOFTWARE &&
1695             (attr->config == PERF_COUNT_SW_PAGE_FAULTS ||
1696              attr->config == PERF_COUNT_SW_PAGE_FAULTS_MIN ||
1697              attr->config == PERF_COUNT_SW_PAGE_FAULTS_MAJ))
1698                 return true;
1699 
1700         if (is_bts_event(attr))
1701                 return true;
1702 
1703         return false;
1704 }
1705 
1706 void thread__resolve(struct thread *thread, struct addr_location *al,
1707                      struct perf_sample *sample)
1708 {
1709         thread__find_map_fb(thread, sample->cpumode, sample->addr, al);
1710 
1711         al->cpu = sample->cpu;
1712         al->sym = NULL;
1713 
1714         if (al->map)
1715                 al->sym = map__find_symbol(al->map, al->addr);
1716 }
1717 

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