thread.c 4.5 KB
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#include "../perf.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
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#include "session.h"
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#include "thread.h"
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#include "thread-stack.h"
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#include "util.h"
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#include "debug.h"
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#include "comm.h"
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#include "unwind.h"
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int thread__init_map_groups(struct thread *thread, struct machine *machine)
{
	struct thread *leader;
	pid_t pid = thread->pid_;

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	if (pid == thread->tid || pid == -1) {
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		thread->mg = map_groups__new(machine);
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	} else {
		leader = machine__findnew_thread(machine, pid, pid);
		if (leader)
			thread->mg = map_groups__get(leader->mg);
	}

	return thread->mg ? 0 : -1;
}

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struct thread *thread__new(pid_t pid, pid_t tid)
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{
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	char *comm_str;
	struct comm *comm;
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	struct thread *thread = zalloc(sizeof(*thread));
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	if (thread != NULL) {
		thread->pid_ = pid;
		thread->tid = tid;
		thread->ppid = -1;
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		thread->cpu = -1;
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		INIT_LIST_HEAD(&thread->comm_list);

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		if (unwind__prepare_access(thread) < 0)
			goto err_thread;

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		comm_str = malloc(32);
		if (!comm_str)
			goto err_thread;

		snprintf(comm_str, 32, ":%d", tid);
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		comm = comm__new(comm_str, 0, false);
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		free(comm_str);
		if (!comm)
			goto err_thread;

		list_add(&comm->list, &thread->comm_list);
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	}

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	return thread;
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err_thread:
	free(thread);
	return NULL;
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}

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void thread__delete(struct thread *thread)
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{
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	struct comm *comm, *tmp;

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	thread_stack__free(thread);

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	if (thread->mg) {
		map_groups__put(thread->mg);
		thread->mg = NULL;
	}
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	list_for_each_entry_safe(comm, tmp, &thread->comm_list, list) {
		list_del(&comm->list);
		comm__free(comm);
	}
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	unwind__finish_access(thread);
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	free(thread);
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}

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struct comm *thread__comm(const struct thread *thread)
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{
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	if (list_empty(&thread->comm_list))
		return NULL;
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	return list_first_entry(&thread->comm_list, struct comm, list);
}

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struct comm *thread__exec_comm(const struct thread *thread)
{
	struct comm *comm, *last = NULL;

	list_for_each_entry(comm, &thread->comm_list, list) {
		if (comm->exec)
			return comm;
		last = comm;
	}

	return last;
}

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/* CHECKME: time should always be 0 if event aren't ordered */
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int __thread__set_comm(struct thread *thread, const char *str, u64 timestamp,
		       bool exec)
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{
	struct comm *new, *curr = thread__comm(thread);
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	int err;
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	/* Override latest entry if it had no specific time coverage */
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	if (!curr->start && !curr->exec) {
		err = comm__override(curr, str, timestamp, exec);
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		if (err)
			return err;
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	} else {
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		new = comm__new(str, timestamp, exec);
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		if (!new)
			return -ENOMEM;
		list_add(&new->list, &thread->comm_list);
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		if (exec)
			unwind__flush_access(thread);
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	}
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	thread->comm_set = true;

	return 0;
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}

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const char *thread__comm_str(const struct thread *thread)
{
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	const struct comm *comm = thread__comm(thread);

	if (!comm)
		return NULL;

	return comm__str(comm);
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}

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/* CHECKME: it should probably better return the max comm len from its comm list */
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int thread__comm_len(struct thread *thread)
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{
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	if (!thread->comm_len) {
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		const char *comm = thread__comm_str(thread);
		if (!comm)
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			return 0;
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		thread->comm_len = strlen(comm);
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	}

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	return thread->comm_len;
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}

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size_t thread__fprintf(struct thread *thread, FILE *fp)
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{
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	return fprintf(fp, "Thread %d %s\n", thread->tid, thread__comm_str(thread)) +
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	       map_groups__fprintf(thread->mg, fp);
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}

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void thread__insert_map(struct thread *thread, struct map *map)
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{
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	map_groups__fixup_overlappings(thread->mg, map, stderr);
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	map_groups__insert(thread->mg, map);
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}

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static int thread__clone_map_groups(struct thread *thread,
				    struct thread *parent)
{
	int i;

	/* This is new thread, we share map groups for process. */
	if (thread->pid_ == parent->pid_)
		return 0;

	/* But this one is new process, copy maps. */
	for (i = 0; i < MAP__NR_TYPES; ++i)
		if (map_groups__clone(thread->mg, parent->mg, i) < 0)
			return -ENOMEM;

	return 0;
}

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int thread__fork(struct thread *thread, struct thread *parent, u64 timestamp)
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{
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	int err;
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	if (parent->comm_set) {
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		const char *comm = thread__comm_str(parent);
		if (!comm)
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			return -ENOMEM;
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		err = thread__set_comm(thread, comm, timestamp);
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		if (err)
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			return err;
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		thread->comm_set = true;
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	}
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	thread->ppid = parent->tid;
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	return thread__clone_map_groups(thread, parent);
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}
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void thread__find_cpumode_addr_location(struct thread *thread,
					enum map_type type, u64 addr,
					struct addr_location *al)
{
	size_t i;
	const u8 const cpumodes[] = {
		PERF_RECORD_MISC_USER,
		PERF_RECORD_MISC_KERNEL,
		PERF_RECORD_MISC_GUEST_USER,
		PERF_RECORD_MISC_GUEST_KERNEL
	};

	for (i = 0; i < ARRAY_SIZE(cpumodes); i++) {
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		thread__find_addr_location(thread, cpumodes[i], type, addr, al);
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		if (al->map)
			break;
	}
}