380 lines
8.1 KiB
C
380 lines
8.1 KiB
C
#include <linux/types.h>
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#include "event.h"
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#include "debug.h"
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#include "string.h"
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#include "thread.h"
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static pid_t event__synthesize_comm(pid_t pid, int full,
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int (*process)(event_t *event))
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{
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event_t ev;
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char filename[PATH_MAX];
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char bf[BUFSIZ];
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FILE *fp;
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size_t size = 0;
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DIR *tasks;
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struct dirent dirent, *next;
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pid_t tgid = 0;
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snprintf(filename, sizeof(filename), "/proc/%d/status", pid);
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fp = fopen(filename, "r");
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if (fp == NULL) {
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out_race:
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/*
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* We raced with a task exiting - just return:
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*/
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pr_debug("couldn't open %s\n", filename);
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return 0;
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}
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memset(&ev.comm, 0, sizeof(ev.comm));
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while (!ev.comm.comm[0] || !ev.comm.pid) {
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if (fgets(bf, sizeof(bf), fp) == NULL)
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goto out_failure;
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if (memcmp(bf, "Name:", 5) == 0) {
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char *name = bf + 5;
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while (*name && isspace(*name))
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++name;
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size = strlen(name) - 1;
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memcpy(ev.comm.comm, name, size++);
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} else if (memcmp(bf, "Tgid:", 5) == 0) {
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char *tgids = bf + 5;
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while (*tgids && isspace(*tgids))
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++tgids;
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tgid = ev.comm.pid = atoi(tgids);
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}
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}
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ev.comm.header.type = PERF_RECORD_COMM;
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size = ALIGN(size, sizeof(u64));
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ev.comm.header.size = sizeof(ev.comm) - (sizeof(ev.comm.comm) - size);
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if (!full) {
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ev.comm.tid = pid;
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process(&ev);
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goto out_fclose;
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}
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snprintf(filename, sizeof(filename), "/proc/%d/task", pid);
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tasks = opendir(filename);
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if (tasks == NULL)
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goto out_race;
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while (!readdir_r(tasks, &dirent, &next) && next) {
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char *end;
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pid = strtol(dirent.d_name, &end, 10);
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if (*end)
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continue;
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ev.comm.tid = pid;
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process(&ev);
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}
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closedir(tasks);
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out_fclose:
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fclose(fp);
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return tgid;
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out_failure:
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pr_warning("couldn't get COMM and pgid, malformed %s\n", filename);
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return -1;
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}
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static int event__synthesize_mmap_events(pid_t pid, pid_t tgid,
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int (*process)(event_t *event))
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{
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char filename[PATH_MAX];
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FILE *fp;
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snprintf(filename, sizeof(filename), "/proc/%d/maps", pid);
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fp = fopen(filename, "r");
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if (fp == NULL) {
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/*
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* We raced with a task exiting - just return:
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*/
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pr_debug("couldn't open %s\n", filename);
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return -1;
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}
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while (1) {
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char bf[BUFSIZ], *pbf = bf;
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event_t ev = {
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.header = { .type = PERF_RECORD_MMAP },
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};
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int n;
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size_t size;
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if (fgets(bf, sizeof(bf), fp) == NULL)
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break;
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/* 00400000-0040c000 r-xp 00000000 fd:01 41038 /bin/cat */
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n = hex2u64(pbf, &ev.mmap.start);
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if (n < 0)
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continue;
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pbf += n + 1;
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n = hex2u64(pbf, &ev.mmap.len);
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if (n < 0)
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continue;
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pbf += n + 3;
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if (*pbf == 'x') { /* vm_exec */
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char *execname = strchr(bf, '/');
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/* Catch VDSO */
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if (execname == NULL)
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execname = strstr(bf, "[vdso]");
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if (execname == NULL)
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continue;
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size = strlen(execname);
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execname[size - 1] = '\0'; /* Remove \n */
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memcpy(ev.mmap.filename, execname, size);
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size = ALIGN(size, sizeof(u64));
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ev.mmap.len -= ev.mmap.start;
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ev.mmap.header.size = (sizeof(ev.mmap) -
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(sizeof(ev.mmap.filename) - size));
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ev.mmap.pid = tgid;
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ev.mmap.tid = pid;
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process(&ev);
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}
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}
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fclose(fp);
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return 0;
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}
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int event__synthesize_thread(pid_t pid, int (*process)(event_t *event))
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{
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pid_t tgid = event__synthesize_comm(pid, 1, process);
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if (tgid == -1)
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return -1;
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return event__synthesize_mmap_events(pid, tgid, process);
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}
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void event__synthesize_threads(int (*process)(event_t *event))
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{
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DIR *proc;
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struct dirent dirent, *next;
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proc = opendir("/proc");
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while (!readdir_r(proc, &dirent, &next) && next) {
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char *end;
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pid_t pid = strtol(dirent.d_name, &end, 10);
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if (*end) /* only interested in proper numerical dirents */
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continue;
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event__synthesize_thread(pid, process);
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}
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closedir(proc);
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}
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char *event__cwd;
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int event__cwdlen;
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struct events_stats event__stats;
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int event__process_comm(event_t *self)
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{
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struct thread *thread = threads__findnew(self->comm.pid);
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dump_printf(": %s:%d\n", self->comm.comm, self->comm.pid);
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if (thread == NULL || thread__set_comm(thread, self->comm.comm)) {
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dump_printf("problem processing PERF_RECORD_COMM, skipping event.\n");
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return -1;
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}
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return 0;
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}
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int event__process_lost(event_t *self)
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{
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dump_printf(": id:%Ld: lost:%Ld\n", self->lost.id, self->lost.lost);
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event__stats.lost += self->lost.lost;
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return 0;
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}
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int event__process_mmap(event_t *self)
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{
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struct thread *thread = threads__findnew(self->mmap.pid);
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struct map *map = map__new(&self->mmap, MAP__FUNCTION,
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event__cwd, event__cwdlen);
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dump_printf(" %d/%d: [%p(%p) @ %p]: %s\n",
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self->mmap.pid, self->mmap.tid,
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(void *)(long)self->mmap.start,
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(void *)(long)self->mmap.len,
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(void *)(long)self->mmap.pgoff,
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self->mmap.filename);
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if (thread == NULL || map == NULL)
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dump_printf("problem processing PERF_RECORD_MMAP, skipping event.\n");
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else
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thread__insert_map(thread, map);
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return 0;
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}
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int event__process_task(event_t *self)
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{
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struct thread *thread = threads__findnew(self->fork.pid);
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struct thread *parent = threads__findnew(self->fork.ppid);
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dump_printf("(%d:%d):(%d:%d)\n", self->fork.pid, self->fork.tid,
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self->fork.ppid, self->fork.ptid);
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/*
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* A thread clone will have the same PID for both parent and child.
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*/
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if (thread == parent)
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return 0;
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if (self->header.type == PERF_RECORD_EXIT)
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return 0;
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if (thread == NULL || parent == NULL ||
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thread__fork(thread, parent) < 0) {
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dump_printf("problem processing PERF_RECORD_FORK, skipping event.\n");
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return -1;
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}
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return 0;
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}
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void thread__find_addr_location(struct thread *self, u8 cpumode,
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enum map_type type, u64 addr,
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struct addr_location *al,
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symbol_filter_t filter)
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{
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struct thread *thread = al->thread = self;
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al->addr = addr;
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if (cpumode & PERF_RECORD_MISC_KERNEL) {
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al->level = 'k';
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thread = kthread;
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} else if (cpumode & PERF_RECORD_MISC_USER)
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al->level = '.';
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else {
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al->level = 'H';
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al->map = NULL;
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al->sym = NULL;
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return;
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}
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try_again:
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al->map = thread__find_map(thread, type, al->addr);
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if (al->map == NULL) {
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/*
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* If this is outside of all known maps, and is a negative
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* address, try to look it up in the kernel dso, as it might be
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* a vsyscall or vdso (which executes in user-mode).
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*
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* XXX This is nasty, we should have a symbol list in the
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* "[vdso]" dso, but for now lets use the old trick of looking
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* in the whole kernel symbol list.
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*/
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if ((long long)al->addr < 0 && thread != kthread) {
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thread = kthread;
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goto try_again;
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}
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al->sym = NULL;
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} else {
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al->addr = al->map->map_ip(al->map, al->addr);
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al->sym = map__find_symbol(al->map, al->addr, filter);
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}
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}
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int event__preprocess_sample(const event_t *self, struct addr_location *al,
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symbol_filter_t filter)
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{
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u8 cpumode = self->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
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struct thread *thread = threads__findnew(self->ip.pid);
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if (thread == NULL)
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return -1;
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dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);
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thread__find_addr_location(thread, cpumode, MAP__FUNCTION,
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self->ip.ip, al, filter);
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dump_printf(" ...... dso: %s\n",
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al->map ? al->map->dso->long_name :
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al->level == 'H' ? "[hypervisor]" : "<not found>");
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return 0;
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}
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int event__parse_sample(event_t *event, u64 type, struct sample_data *data)
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{
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u64 *array = event->sample.array;
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if (type & PERF_SAMPLE_IP) {
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data->ip = event->ip.ip;
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array++;
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}
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if (type & PERF_SAMPLE_TID) {
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u32 *p = (u32 *)array;
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data->pid = p[0];
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data->tid = p[1];
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array++;
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}
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if (type & PERF_SAMPLE_TIME) {
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data->time = *array;
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array++;
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}
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if (type & PERF_SAMPLE_ADDR) {
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data->addr = *array;
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array++;
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}
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if (type & PERF_SAMPLE_ID) {
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data->id = *array;
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array++;
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}
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if (type & PERF_SAMPLE_STREAM_ID) {
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data->stream_id = *array;
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array++;
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}
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if (type & PERF_SAMPLE_CPU) {
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u32 *p = (u32 *)array;
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data->cpu = *p;
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array++;
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}
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if (type & PERF_SAMPLE_PERIOD) {
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data->period = *array;
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array++;
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}
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if (type & PERF_SAMPLE_READ) {
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pr_debug("PERF_SAMPLE_READ is unsuported for now\n");
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return -1;
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}
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if (type & PERF_SAMPLE_CALLCHAIN) {
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data->callchain = (struct ip_callchain *)array;
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array += 1 + data->callchain->nr;
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}
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if (type & PERF_SAMPLE_RAW) {
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u32 *p = (u32 *)array;
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data->raw_size = *p;
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p++;
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data->raw_data = p;
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}
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return 0;
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}
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