text: #include <linux/types.h>
  #include "event.h"
  #include "debug.h"
  #include "sort.h"
  #include "string.h"
  #include "strlist.h"
  #include "thread.h"
  #include "thread_map.h"
  
  static const char *perf_event__names[] = {
  	[0]					= "TOTAL",
  	[PERF_RECORD_MMAP]			= "MMAP",
  	[PERF_RECORD_LOST]			= "LOST",
  	[PERF_RECORD_COMM]			= "COMM",
  	[PERF_RECORD_EXIT]			= "EXIT",
  	[PERF_RECORD_THROTTLE]			= "THROTTLE",
  	[PERF_RECORD_UNTHROTTLE]		= "UNTHROTTLE",
  	[PERF_RECORD_FORK]			= "FORK",
  	[PERF_RECORD_READ]			= "READ",
  	[PERF_RECORD_SAMPLE]			= "SAMPLE",
  	[PERF_RECORD_HEADER_ATTR]		= "ATTR",
  	[PERF_RECORD_HEADER_EVENT_TYPE]		= "EVENT_TYPE",
  	[PERF_RECORD_HEADER_TRACING_DATA]	= "TRACING_DATA",
  	[PERF_RECORD_HEADER_BUILD_ID]		= "BUILD_ID",
  	[PERF_RECORD_FINISHED_ROUND]		= "FINISHED_ROUND",
  };
  
  const char *perf_event__name(unsigned int id)
  {
  	if (id >= ARRAY_SIZE(perf_event__names))
  		return "INVALID";
  	if (!perf_event__names[id])
  		return "UNKNOWN";
  	return perf_event__names[id];
  }
  
  static struct perf_sample synth_sample = {
  	.pid	   = -1,
  	.tid	   = -1,
  	.time	   = -1,
  	.stream_id = -1,
  	.cpu	   = -1,
  	.period	   = 1,
  };
  
  static pid_t perf_event__get_comm_tgid(pid_t pid, char *comm, size_t len)
  {
  	char filename[PATH_MAX];
  	char bf[BUFSIZ];
  	FILE *fp;
  	size_t size = 0;
  	pid_t tgid = -1;
  
  	snprintf(filename, sizeof(filename), "/proc/%d/status", pid);
  
  	fp = fopen(filename, "r");
  	if (fp == NULL) {
  		pr_debug("couldn't open %s\n", filename);
  		return 0;
  	}
  
  	while (!comm[0] || (tgid < 0)) {
  		if (fgets(bf, sizeof(bf), fp) == NULL) {
  			pr_warning("couldn't get COMM and pgid, malformed %s\n",
  				   filename);
  			break;
  		}
  
  		if (memcmp(bf, "Name:", 5) == 0) {
  			char *name = bf + 5;
  			while (*name && isspace(*name))
  				++name;
  			size = strlen(name) - 1;
  			if (size >= len)
  				size = len - 1;
  			memcpy(comm, name, size);
  			comm[size] = '\0';
  
  		} else if (memcmp(bf, "Tgid:", 5) == 0) {
  			char *tgids = bf + 5;
  			while (*tgids && isspace(*tgids))
  				++tgids;
  			tgid = atoi(tgids);
  		}
  	}
  
  	fclose(fp);
  
  	return tgid;
  }
  
  static pid_t perf_event__synthesize_comm(struct perf_tool *tool,
  					 union perf_event *event, pid_t pid,
  					 int full,
  					 perf_event__handler_t process,
  					 struct machine *machine)
  {
  	char filename[PATH_MAX];
  	size_t size;
  	DIR *tasks;
  	struct dirent dirent, *next;
  	pid_t tgid;
  
  	memset(&event->comm, 0, sizeof(event->comm));
  
  	tgid = perf_event__get_comm_tgid(pid, event->comm.comm,
  					 sizeof(event->comm.comm));
  	if (tgid < 0)
  		goto out;
  
  	event->comm.pid = tgid;
  	event->comm.header.type = PERF_RECORD_COMM;
  
  	size = strlen(event->comm.comm) + 1;
  	size = ALIGN(size, sizeof(u64));
  	memset(event->comm.comm + size, 0, machine->id_hdr_size);
  	event->comm.header.size = (sizeof(event->comm) -
  				(sizeof(event->comm.comm) - size) +
  				machine->id_hdr_size);
  	if (!full) {
  		event->comm.tid = pid;
  
  		process(tool, event, &synth_sample, machine);
  		goto out;
  	}
  
  	snprintf(filename, sizeof(filename), "/proc/%d/task", pid);
  
  	tasks = opendir(filename);
  	if (tasks == NULL) {
  		pr_debug("couldn't open %s\n", filename);
  		return 0;
  	}
  
  	while (!readdir_r(tasks, &dirent, &next) && next) {
  		char *end;
  		pid = strtol(dirent.d_name, &end, 10);
  		if (*end)
  			continue;
  
  		/* already have tgid; jut want to update the comm */
  		(void) perf_event__get_comm_tgid(pid, event->comm.comm,
  					 sizeof(event->comm.comm));
  
  		size = strlen(event->comm.comm) + 1;
  		size = ALIGN(size, sizeof(u64));
  		memset(event->comm.comm + size, 0, machine->id_hdr_size);
  		event->comm.header.size = (sizeof(event->comm) -
  					  (sizeof(event->comm.comm) - size) +
  					  machine->id_hdr_size);
  
  		event->comm.tid = pid;
  
  		process(tool, event, &synth_sample, machine);
  	}
  
  	closedir(tasks);
  out:
  	return tgid;
  }
  
  static int perf_event__synthesize_mmap_events(struct perf_tool *tool,
  					      union perf_event *event,
  					      pid_t pid, pid_t tgid,
  					      perf_event__handler_t process,
  					      struct machine *machine)
  {
  	char filename[PATH_MAX];
  	FILE *fp;
  
  	snprintf(filename, sizeof(filename), "/proc/%d/maps", pid);
  
  	fp = fopen(filename, "r");
  	if (fp == NULL) {
  		/*
  		 * We raced with a task exiting - just return:
  		 */
  		pr_debug("couldn't open %s\n", filename);
  		return -1;
  	}
  
  	event->header.type = PERF_RECORD_MMAP;
  	/*
  	 * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
  	 */
  	event->header.misc = PERF_RECORD_MISC_USER;
  
  	while (1) {
  		char bf[BUFSIZ], *pbf = bf;
  		int n;
  		size_t size;
  		if (fgets(bf, sizeof(bf), fp) == NULL)
  			break;
  
  		/* 00400000-0040c000 r-xp 00000000 fd:01 41038  /bin/cat */
  		n = hex2u64(pbf, &event->mmap.start);
  		if (n < 0)
  			continue;
  		pbf += n + 1;
  		n = hex2u64(pbf, &event->mmap.len);
  		if (n < 0)
  			continue;
  		pbf += n + 3;
  		if (*pbf == 'x') { /* vm_exec */
  			char anonstr[] = "//anon\n";
  			char *execname = strchr(bf, '/');
  
  			/* Catch VDSO */
  			if (execname == NULL)
  				execname = strstr(bf, "[vdso]");
  
  			/* Catch anonymous mmaps */
  			if ((execname == NULL) && !strstr(bf, "["))
  				execname = anonstr;
  
  			if (execname == NULL)
  				continue;
  
  			pbf += 3;
  			n = hex2u64(pbf, &event->mmap.pgoff);
  
  			size = strlen(execname);
  			execname[size - 1] = '\0'; /* Remove \n */
  			memcpy(event->mmap.filename, execname, size);
  			size = ALIGN(size, sizeof(u64));
  			event->mmap.len -= event->mmap.start;
  			event->mmap.header.size = (sizeof(event->mmap) -
  					        (sizeof(event->mmap.filename) - size));
  			memset(event->mmap.filename + size, 0, machine->id_hdr_size);
  			event->mmap.header.size += machine->id_hdr_size;
  			event->mmap.pid = tgid;
  			event->mmap.tid = pid;
  
  			process(tool, event, &synth_sample, machine);
  		}
  	}
  
  	fclose(fp);
  	return 0;
  }
  
  int perf_event__synthesize_modules(struct perf_tool *tool,
  				   perf_event__handler_t process,
  				   struct machine *machine)
  {
  	struct rb_node *nd;
  	struct map_groups *kmaps = &machine->kmaps;
  	union perf_event *event = zalloc((sizeof(event->mmap) +
  					  machine->id_hdr_size));
  	if (event == NULL) {
  		pr_debug("Not enough memory synthesizing mmap event "
  			 "for kernel modules\n");
  		return -1;
  	}
  
  	event->header.type = PERF_RECORD_MMAP;
  
  	/*
  	 * kernel uses 0 for user space maps, see kernel/perf_event.c
  	 * __perf_event_mmap
  	 */
  	if (machine__is_host(machine))
  		event->header.misc = PERF_RECORD_MISC_KERNEL;
  	else
  		event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
  
  	for (nd = rb_first(&kmaps->maps[MAP__FUNCTION]);
  	     nd; nd = rb_next(nd)) {
  		size_t size;
  		struct map *pos = rb_entry(nd, struct map, rb_node);
  
  		if (pos->dso->kernel)
  			continue;
  
  		size = ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
  		event->mmap.header.type = PERF_RECORD_MMAP;
  		event->mmap.header.size = (sizeof(event->mmap) -
  				        (sizeof(event->mmap.filename) - size));
  		memset(event->mmap.filename + size, 0, machine->id_hdr_size);
  		event->mmap.header.size += machine->id_hdr_size;
  		event->mmap.start = pos->start;
  		event->mmap.len   = pos->end - pos->start;
  		event->mmap.pid   = machine->pid;
  
  		memcpy(event->mmap.filename, pos->dso->long_name,
  		       pos->dso->long_name_len + 1);
  		process(tool, event, &synth_sample, machine);
  	}
  
  	free(event);
  	return 0;
  }
  
  static int __event__synthesize_thread(union perf_event *comm_event,
  				      union perf_event *mmap_event,
  				      pid_t pid, int full,
  					  perf_event__handler_t process,
  				      struct perf_tool *tool,
  				      struct machine *machine)
  {
  	pid_t tgid = perf_event__synthesize_comm(tool, comm_event, pid, full,
  						 process, machine);
  	if (tgid == -1)
  		return -1;
  	return perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
  						  process, machine);
  }
  
  int perf_event__synthesize_thread_map(struct perf_tool *tool,
  				      struct thread_map *threads,
  				      perf_event__handler_t process,
  				      struct machine *machine)
  {
  	union perf_event *comm_event, *mmap_event;
  	int err = -1, thread, j;
  
  	comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
  	if (comm_event == NULL)
  		goto out;
  
  	mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
  	if (mmap_event == NULL)
  		goto out_free_comm;
  
  	err = 0;
  	for (thread = 0; thread < threads->nr; ++thread) {
  		if (__event__synthesize_thread(comm_event, mmap_event,
  					       threads->map[thread], 0,
  					       process, tool, machine)) {
  			err = -1;
  			break;
  		}
  
  		/*
  		 * comm.pid is set to thread group id by
  		 * perf_event__synthesize_comm
  		 */
  		if ((int) comm_event->comm.pid != threads->map[thread]) {
  			bool need_leader = true;
  
  			/* is thread group leader in thread_map? */
  			for (j = 0; j < threads->nr; ++j) {
  				if ((int) comm_event->comm.pid == threads->map[j]) {
  					need_leader = false;
  					break;
  				}
  			}
  
  			/* if not, generate events for it */
  			if (need_leader &&
  			    __event__synthesize_thread(comm_event,
  						      mmap_event,
  						      comm_event->comm.pid, 0,
  						      process, tool, machine)) {
  				err = -1;
  				break;
  			}
  		}
  	}
  	free(mmap_event);
  out_free_comm:
  	free(comm_event);
  out:
  	return err;
  }
  
  int perf_event__synthesize_threads(struct perf_tool *tool,
  				   perf_event__handler_t process,
  				   struct machine *machine)
  {
  	DIR *proc;
  	struct dirent dirent, *next;
  	union perf_event *comm_event, *mmap_event;
  	int err = -1;
  
  	comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
  	if (comm_event == NULL)
  		goto out;
  
  	mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
  	if (mmap_event == NULL)
  		goto out_free_comm;
  
  	proc = opendir("/proc");
  	if (proc == NULL)
  		goto out_free_mmap;
  
  	while (!readdir_r(proc, &dirent, &next) && next) {
  		char *end;
  		pid_t pid = strtol(dirent.d_name, &end, 10);
  
  		if (*end) /* only interested in proper numerical dirents */
  			continue;
  
  		__event__synthesize_thread(comm_event, mmap_event, pid, 1,
  					   process, tool, machine);
  	}
  
  	closedir(proc);
  	err = 0;
  out_free_mmap:
  	free(mmap_event);
  out_free_comm:
  	free(comm_event);
  out:
  	return err;
  }
  
  struct process_symbol_args {
  	const char *name;
  	u64	   start;
  };
  
  static int find_symbol_cb(void *arg, const char *name, char type,
  			  u64 start, u64 end __used)
  {
  	struct process_symbol_args *args = arg;
  
  	/*
  	 * Must be a function or at least an alias, as in PARISC64, where "_text" is
  	 * an 'A' to the same address as "_stext".
  	 */
  	if (!(symbol_type__is_a(type, MAP__FUNCTION) ||
  	      type == 'A') || strcmp(name, args->name))
  		return 0;
  
  	args->start = start;
  	return 1;
  }
  
  int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
  				       perf_event__handler_t process,
  				       struct machine *machine,
  				       const char *symbol_name)
  {
  	size_t size;
  	const char *filename, *mmap_name;
  	char path[PATH_MAX];
  	char name_buff[PATH_MAX];
  	struct map *map;
  	int err;
  	/*
  	 * We should get this from /sys/kernel/sections/.text, but till that is
  	 * available use this, and after it is use this as a fallback for older
  	 * kernels.
  	 */
  	struct process_symbol_args args = { .name = symbol_name, };
  	union perf_event *event = zalloc((sizeof(event->mmap) +
  					  machine->id_hdr_size));
  	if (event == NULL) {
  		pr_debug("Not enough memory synthesizing mmap event "
  			 "for kernel modules\n");
  		return -1;
  	}
  
  	mmap_name = machine__mmap_name(machine, name_buff, sizeof(name_buff));
  	if (machine__is_host(machine)) {
  		/*
  		 * kernel uses PERF_RECORD_MISC_USER for user space maps,
  		 * see kernel/perf_event.c __perf_event_mmap
  		 */
  		event->header.misc = PERF_RECORD_MISC_KERNEL;
  		filename = "/proc/kallsyms";
  	} else {
  		event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
  		if (machine__is_default_guest(machine))
  			filename = (char *) symbol_conf.default_guest_kallsyms;
  		else {
  			sprintf(path, "%s/proc/kallsyms", machine->root_dir);
  			filename = path;
  		}
  	}
  
  	if (kallsyms__parse(filename, &args, find_symbol_cb) <= 0)
  		return -ENOENT;
  
  	map = machine->vmlinux_maps[MAP__FUNCTION];
  	size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
  			"%s%s", mmap_name, symbol_name) + 1;
  	size = ALIGN(size, sizeof(u64));
  	event->mmap.header.type = PERF_RECORD_MMAP;
  	event->mmap.header.size = (sizeof(event->mmap) -
  			(sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
  	event->mmap.pgoff = args.start;
  	event->mmap.start = map->start;
  	event->mmap.len   = map->end - event->mmap.start;
  	event->mmap.pid   = machine->pid;
  
  	err = process(tool, event, &synth_sample, machine);
  	free(event);
  
  	return err;
  }
  
  size_t perf_event__fprintf_comm(union perf_event *event, FILE *fp)
  {
  	return fprintf(fp, ": %s:%d\n", event->comm.comm, event->comm.tid);
  }
  
  int perf_event__process_comm(struct perf_tool *tool __used,
  			     union perf_event *event,
  			     struct perf_sample *sample __used,
  			     struct machine *machine)
  {
  	struct thread *thread = machine__findnew_thread(machine, event->comm.tid);
  
  	if (dump_trace)
  		perf_event__fprintf_comm(event, stdout);
  
  	if (thread == NULL || thread__set_comm(thread, event->comm.comm)) {
  		dump_printf("problem processing PERF_RECORD_COMM, skipping event.\n");
  		return -1;
  	}
  
  	return 0;
  }
  
  int perf_event__process_lost(struct perf_tool *tool __used,
  			     union perf_event *event,
  			     struct perf_sample *sample __used,
  			     struct machine *machine __used)
  {
  	dump_printf(": id:%" PRIu64 ": lost:%" PRIu64 "\n",
  		    event->lost.id, event->lost.lost);
  	return 0;
  }
  
  static void perf_event__set_kernel_mmap_len(union perf_event *event,
  					    struct map **maps)
  {
  	maps[MAP__FUNCTION]->start = event->mmap.start;
  	maps[MAP__FUNCTION]->end   = event->mmap.start + event->mmap.len;
  	/*
  	 * Be a bit paranoid here, some perf.data file came with
  	 * a zero sized synthesized MMAP event for the kernel.
  	 */
  	if (maps[MAP__FUNCTION]->end == 0)
  		maps[MAP__FUNCTION]->end = ~0ULL;
  }
  
  static int perf_event__process_kernel_mmap(struct perf_tool *tool __used,
  					   union perf_event *event,
  					   struct machine *machine)
  {
  	struct map *map;
  	char kmmap_prefix[PATH_MAX];
  	enum dso_kernel_type kernel_type;
  	bool is_kernel_mmap;
  
  	machine__mmap_name(machine, kmmap_prefix, sizeof(kmmap_prefix));
  	if (machine__is_host(machine))
  		kernel_type = DSO_TYPE_KERNEL;
  	else
  		kernel_type = DSO_TYPE_GUEST_KERNEL;
  
  	is_kernel_mmap = memcmp(event->mmap.filename,
  				kmmap_prefix,
  				strlen(kmmap_prefix) - 1) == 0;
  	if (event->mmap.filename[0] == '/' ||
  	    (!is_kernel_mmap && event->mmap.filename[0] == '[')) {
  
  		char short_module_name[1024];
  		char *name, *dot;
  
  		if (event->mmap.filename[0] == '/') {
  			name = strrchr(event->mmap.filename, '/');
  			if (name == NULL)
  				goto out_problem;
  
  			++name; /* skip / */
  			dot = strrchr(name, '.');
  			if (dot == NULL)
  				goto out_problem;
  			snprintf(short_module_name, sizeof(short_module_name),
  					"[%.*s]", (int)(dot - name), name);
  			strxfrchar(short_module_name, '-', '_');
  		} else
  			strcpy(short_module_name, event->mmap.filename);
  
  		map = machine__new_module(machine, event->mmap.start,
  					  event->mmap.filename);
  		if (map == NULL)
  			goto out_problem;
  
  		name = strdup(short_module_name);
  		if (name == NULL)
  			goto out_problem;
  
  		map->dso->short_name = name;
  		map->dso->sname_alloc = 1;
  		map->end = map->start + event->mmap.len;
  	} else if (is_kernel_mmap) {
  		const char *symbol_name = (event->mmap.filename +
  				strlen(kmmap_prefix));
  		/*
  		 * Should be there already, from the build-id table in
  		 * the header.
  		 */
  		struct dso *kernel = __dsos__findnew(&machine->kernel_dsos,
  						     kmmap_prefix);
  		if (kernel == NULL)
  			goto out_problem;
  
  		kernel->kernel = kernel_type;
  		if (__machine__create_kernel_maps(machine, kernel) < 0)
  			goto out_problem;
  
  		perf_event__set_kernel_mmap_len(event, machine->vmlinux_maps);
  
  		/*
  		 * Avoid using a zero address (kptr_restrict) for the ref reloc
  		 * symbol. Effectively having zero here means that at record
  		 * time /proc/sys/kernel/kptr_restrict was non zero.
  		 */
  		if (event->mmap.pgoff != 0) {
  			maps__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps,
  							 symbol_name,
  							 event->mmap.pgoff);
  		}
  
  		if (machine__is_default_guest(machine)) {
  			/*
  			 * preload dso of guest kernel and modules
  			 */
  			dso__load(kernel, machine->vmlinux_maps[MAP__FUNCTION],
  				  NULL);
  		}
  	}
  	return 0;
  out_problem:
  	return -1;
  }
  
  size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp)
  {
  	return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64 "]: %s\n",
  		       event->mmap.pid, event->mmap.tid, event->mmap.start,
  		       event->mmap.len, event->mmap.pgoff, event->mmap.filename);
  }
  
  int perf_event__process_mmap(struct perf_tool *tool,
  			     union perf_event *event,
  			     struct perf_sample *sample __used,
  			     struct machine *machine)
  {
  	struct thread *thread;
  	struct map *map;
  	u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
  	int ret = 0;
  
  	if (dump_trace)
  		perf_event__fprintf_mmap(event, stdout);
  
  	if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
  	    cpumode == PERF_RECORD_MISC_KERNEL) {
  		ret = perf_event__process_kernel_mmap(tool, event, machine);
  		if (ret < 0)
  			goto out_problem;
  		return 0;
  	}
  
  	thread = machine__findnew_thread(machine, event->mmap.pid);
  	if (thread == NULL)
  		goto out_problem;
  	map = map__new(&machine->user_dsos, event->mmap.start,
  			event->mmap.len, event->mmap.pgoff,
  			event->mmap.pid, event->mmap.filename,
  			MAP__FUNCTION);
  	if (map == NULL)
  		goto out_problem;
  
  	thread__insert_map(thread, map);
  	return 0;
  
  out_problem:
  	dump_printf("problem processing PERF_RECORD_MMAP, skipping event.\n");
  	return 0;
  }
  
  size_t perf_event__fprintf_task(union perf_event *event, FILE *fp)
  {
  	return fprintf(fp, "(%d:%d):(%d:%d)\n",
  		       event->fork.pid, event->fork.tid,
  		       event->fork.ppid, event->fork.ptid);
  }
  
  int perf_event__process_task(struct perf_tool *tool __used,
  			     union perf_event *event,
  			     struct perf_sample *sample __used,
  			      struct machine *machine)
  {
  	struct thread *thread = machine__findnew_thread(machine, event->fork.tid);
  	struct thread *parent = machine__findnew_thread(machine, event->fork.ptid);
  
  	if (dump_trace)
  		perf_event__fprintf_task(event, stdout);
  
  	if (event->header.type == PERF_RECORD_EXIT) {
  		machine__remove_thread(machine, thread);
  		return 0;
  	}
  
  	if (thread == NULL || parent == NULL ||
  	    thread__fork(thread, parent) < 0) {
  		dump_printf("problem processing PERF_RECORD_FORK, skipping event.\n");
  		return -1;
  	}
  
  	return 0;
  }
  
  size_t perf_event__fprintf(union perf_event *event, FILE *fp)
  {
  	size_t ret = fprintf(fp, "PERF_RECORD_%s",
  			     perf_event__name(event->header.type));
  
  	switch (event->header.type) {
  	case PERF_RECORD_COMM:
  		ret += perf_event__fprintf_comm(event, fp);
  		break;
  	case PERF_RECORD_FORK:
  	case PERF_RECORD_EXIT:
  		ret += perf_event__fprintf_task(event, fp);
  		break;
  	case PERF_RECORD_MMAP:
  		ret += perf_event__fprintf_mmap(event, fp);
  		break;
  	default:
  		ret += fprintf(fp, "\n");
  	}
  
  	return ret;
  }
  
  int perf_event__process(struct perf_tool *tool, union perf_event *event,
  			struct perf_sample *sample, struct machine *machine)
  {
  	switch (event->header.type) {
  	case PERF_RECORD_COMM:
  		perf_event__process_comm(tool, event, sample, machine);
  		break;
  	case PERF_RECORD_MMAP:
  		perf_event__process_mmap(tool, event, sample, machine);
  		break;
  	case PERF_RECORD_FORK:
  	case PERF_RECORD_EXIT:
  		perf_event__process_task(tool, event, sample, machine);
  		break;
  	case PERF_RECORD_LOST:
  		perf_event__process_lost(tool, event, sample, machine);
  	default:
  		break;
  	}
  
  	return 0;
  }
  
  void thread__find_addr_map(struct thread *self,
  			   struct machine *machine, u8 cpumode,
  			   enum map_type type, u64 addr,
  			   struct addr_location *al)
  {
  	struct map_groups *mg = &self->mg;
  
  	al->thread = self;
  	al->addr = addr;
  	al->cpumode = cpumode;
  	al->filtered = false;
  
  	if (machine == NULL) {
  		al->map = NULL;
  		return;
  	}
  
  	if (cpumode == PERF_RECORD_MISC_KERNEL && perf_host) {
  		al->level = 'k';
  		mg = &machine->kmaps;
  	} else if (cpumode == PERF_RECORD_MISC_USER && perf_host) {
  		al->level = '.';
  	} else if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) {
  		al->level = 'g';
  		mg = &machine->kmaps;
  	} else {
  		/*
  		 * 'u' means guest os user space.
  		 * TODO: We don't support guest user space. Might support late.
  		 */
  		if (cpumode == PERF_RECORD_MISC_GUEST_USER && perf_guest)
  			al->level = 'u';
  		else
  			al->level = 'H';
  		al->map = NULL;
  
  		if ((cpumode == PERF_RECORD_MISC_GUEST_USER ||
  			cpumode == PERF_RECORD_MISC_GUEST_KERNEL) &&
  			!perf_guest)
  			al->filtered = true;
  		if ((cpumode == PERF_RECORD_MISC_USER ||
  			cpumode == PERF_RECORD_MISC_KERNEL) &&
  			!perf_host)
  			al->filtered = true;
  
  		return;
  	}
  try_again:
  	al->map = map_groups__find(mg, type, al->addr);
  	if (al->map == NULL) {
  		/*
  		 * If this is outside of all known maps, and is a negative
  		 * address, try to look it up in the kernel dso, as it might be
  		 * a vsyscall or vdso (which executes in user-mode).
  		 *
  		 * XXX This is nasty, we should have a symbol list in the
  		 * "[vdso]" dso, but for now lets use the old trick of looking
  		 * in the whole kernel symbol list.
  		 */
  		if ((long long)al->addr < 0 &&
  		    cpumode == PERF_RECORD_MISC_USER &&
  		    machine && mg != &machine->kmaps) {
  			mg = &machine->kmaps;
  			goto try_again;
  		}
  	} else
  		al->addr = al->map->map_ip(al->map, al->addr);
  }
  
  void thread__find_addr_location(struct thread *thread, struct machine *machine,
  				u8 cpumode, enum map_type type, u64 addr,
  				struct addr_location *al,
  				symbol_filter_t filter)
  {
  	thread__find_addr_map(thread, machine, cpumode, type, addr, al);
  	if (al->map != NULL)
  		al->sym = map__find_symbol(al->map, al->addr, filter);
  	else
  		al->sym = NULL;
  }
  
  int perf_event__preprocess_sample(const union perf_event *event,
  				  struct machine *machine,
  				  struct addr_location *al,
  				  struct perf_sample *sample,
  				  symbol_filter_t filter)
  {
  	u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
  	struct thread *thread = machine__findnew_thread(machine, event->ip.pid);
  
  	if (thread == NULL)
  		return -1;
  
  	if (symbol_conf.comm_list &&
  	    !strlist__has_entry(symbol_conf.comm_list, thread->comm))
  		goto out_filtered;
  
  	dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);
  	/*
  	 * Have we already created the kernel maps for this machine?
  	 *
  	 * This should have happened earlier, when we processed the kernel MMAP
  	 * events, but for older perf.data files there was no such thing, so do
  	 * it now.
  	 */
  	if (cpumode == PERF_RECORD_MISC_KERNEL &&
  	    machine->vmlinux_maps[MAP__FUNCTION] == NULL)
  		machine__create_kernel_maps(machine);
  
  	thread__find_addr_map(thread, machine, cpumode, MAP__FUNCTION,
  			      event->ip.ip, al);
  	dump_printf(" ...... dso: %s\n",
  		    al->map ? al->map->dso->long_name :
  			al->level == 'H' ? "[hypervisor]" : "<not found>");
  	al->sym = NULL;
  	al->cpu = sample->cpu;
  
  	if (al->map) {
  		struct dso *dso = al->map->dso;
  
  		if (symbol_conf.dso_list &&
  		    (!dso || !(strlist__has_entry(symbol_conf.dso_list,
  						  dso->short_name) ||
  			       (dso->short_name != dso->long_name &&
  				strlist__has_entry(symbol_conf.dso_list,
  						   dso->long_name)))))
  			goto out_filtered;
  
  		al->sym = map__find_symbol(al->map, al->addr, filter);
  	}
  
  	if (symbol_conf.sym_list && al->sym &&
  	    !strlist__has_entry(symbol_conf.sym_list, al->sym->name))
  		goto out_filtered;
  
  	return 0;
  
  out_filtered:
  	al->filtered = true;
  	return 0;
  }
  