linux/tools/perf/util/machine.c

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#include "debug.h"
#include "event.h"
#include "machine.h"
#include "map.h"
#include "strlist.h"
#include "thread.h"
#include <stdbool.h>
int machine__init(struct machine *machine, const char *root_dir, pid_t pid)
{
map_groups__init(&machine->kmaps);
RB_CLEAR_NODE(&machine->rb_node);
INIT_LIST_HEAD(&machine->user_dsos);
INIT_LIST_HEAD(&machine->kernel_dsos);
machine->threads = RB_ROOT;
INIT_LIST_HEAD(&machine->dead_threads);
machine->last_match = NULL;
machine->kmaps.machine = machine;
machine->pid = pid;
machine->root_dir = strdup(root_dir);
if (machine->root_dir == NULL)
return -ENOMEM;
if (pid != HOST_KERNEL_ID) {
struct thread *thread = machine__findnew_thread(machine, pid);
char comm[64];
if (thread == NULL)
return -ENOMEM;
snprintf(comm, sizeof(comm), "[guest/%d]", pid);
thread__set_comm(thread, comm);
}
return 0;
}
static void dsos__delete(struct list_head *dsos)
{
struct dso *pos, *n;
list_for_each_entry_safe(pos, n, dsos, node) {
list_del(&pos->node);
dso__delete(pos);
}
}
void machine__exit(struct machine *machine)
{
map_groups__exit(&machine->kmaps);
dsos__delete(&machine->user_dsos);
dsos__delete(&machine->kernel_dsos);
free(machine->root_dir);
machine->root_dir = NULL;
}
void machine__delete(struct machine *machine)
{
machine__exit(machine);
free(machine);
}
struct machine *machines__add(struct rb_root *machines, pid_t pid,
const char *root_dir)
{
struct rb_node **p = &machines->rb_node;
struct rb_node *parent = NULL;
struct machine *pos, *machine = malloc(sizeof(*machine));
if (machine == NULL)
return NULL;
if (machine__init(machine, root_dir, pid) != 0) {
free(machine);
return NULL;
}
while (*p != NULL) {
parent = *p;
pos = rb_entry(parent, struct machine, rb_node);
if (pid < pos->pid)
p = &(*p)->rb_left;
else
p = &(*p)->rb_right;
}
rb_link_node(&machine->rb_node, parent, p);
rb_insert_color(&machine->rb_node, machines);
return machine;
}
struct machine *machines__find(struct rb_root *machines, pid_t pid)
{
struct rb_node **p = &machines->rb_node;
struct rb_node *parent = NULL;
struct machine *machine;
struct machine *default_machine = NULL;
while (*p != NULL) {
parent = *p;
machine = rb_entry(parent, struct machine, rb_node);
if (pid < machine->pid)
p = &(*p)->rb_left;
else if (pid > machine->pid)
p = &(*p)->rb_right;
else
return machine;
if (!machine->pid)
default_machine = machine;
}
return default_machine;
}
struct machine *machines__findnew(struct rb_root *machines, pid_t pid)
{
char path[PATH_MAX];
const char *root_dir = "";
struct machine *machine = machines__find(machines, pid);
if (machine && (machine->pid == pid))
goto out;
if ((pid != HOST_KERNEL_ID) &&
(pid != DEFAULT_GUEST_KERNEL_ID) &&
(symbol_conf.guestmount)) {
sprintf(path, "%s/%d", symbol_conf.guestmount, pid);
if (access(path, R_OK)) {
static struct strlist *seen;
if (!seen)
seen = strlist__new(true, NULL);
if (!strlist__has_entry(seen, path)) {
pr_err("Can't access file %s\n", path);
strlist__add(seen, path);
}
machine = NULL;
goto out;
}
root_dir = path;
}
machine = machines__add(machines, pid, root_dir);
out:
return machine;
}
void machines__process(struct rb_root *machines,
machine__process_t process, void *data)
{
struct rb_node *nd;
for (nd = rb_first(machines); nd; nd = rb_next(nd)) {
struct machine *pos = rb_entry(nd, struct machine, rb_node);
process(pos, data);
}
}
char *machine__mmap_name(struct machine *machine, char *bf, size_t size)
{
if (machine__is_host(machine))
snprintf(bf, size, "[%s]", "kernel.kallsyms");
else if (machine__is_default_guest(machine))
snprintf(bf, size, "[%s]", "guest.kernel.kallsyms");
else {
snprintf(bf, size, "[%s.%d]", "guest.kernel.kallsyms",
machine->pid);
}
return bf;
}
void machines__set_id_hdr_size(struct rb_root *machines, u16 id_hdr_size)
{
struct rb_node *node;
struct machine *machine;
for (node = rb_first(machines); node; node = rb_next(node)) {
machine = rb_entry(node, struct machine, rb_node);
machine->id_hdr_size = id_hdr_size;
}
return;
}
static struct thread *__machine__findnew_thread(struct machine *machine, pid_t pid,
bool create)
{
struct rb_node **p = &machine->threads.rb_node;
struct rb_node *parent = NULL;
struct thread *th;
/*
* Font-end cache - PID lookups come in blocks,
* so most of the time we dont have to look up
* the full rbtree:
*/
if (machine->last_match && machine->last_match->pid == pid)
return machine->last_match;
while (*p != NULL) {
parent = *p;
th = rb_entry(parent, struct thread, rb_node);
if (th->pid == pid) {
machine->last_match = th;
return th;
}
if (pid < th->pid)
p = &(*p)->rb_left;
else
p = &(*p)->rb_right;
}
if (!create)
return NULL;
th = thread__new(pid);
if (th != NULL) {
rb_link_node(&th->rb_node, parent, p);
rb_insert_color(&th->rb_node, &machine->threads);
machine->last_match = th;
}
return th;
}
struct thread *machine__findnew_thread(struct machine *machine, pid_t pid)
{
return __machine__findnew_thread(machine, pid, true);
}
struct thread *machine__find_thread(struct machine *machine, pid_t pid)
{
return __machine__findnew_thread(machine, pid, false);
}
int machine__process_comm_event(struct machine *machine, union perf_event *event)
{
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 machine__process_lost_event(struct machine *machine __maybe_unused,
union perf_event *event)
{
dump_printf(": id:%" PRIu64 ": lost:%" PRIu64 "\n",
event->lost.id, event->lost.lost);
return 0;
}
static void machine__set_kernel_mmap_len(struct machine *machine,
union perf_event *event)
{
int i;
for (i = 0; i < MAP__NR_TYPES; i++) {
machine->vmlinux_maps[i]->start = event->mmap.start;
machine->vmlinux_maps[i]->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 (machine->vmlinux_maps[i]->end == 0)
machine->vmlinux_maps[i]->end = ~0ULL;
}
}
static int machine__process_kernel_mmap_event(struct machine *machine,
union perf_event *event)
{
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;
machine__set_kernel_mmap_len(machine, event);
/*
* 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;
}
int machine__process_mmap_event(struct machine *machine, union perf_event *event)
{
u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
struct thread *thread;
struct map *map;
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 = machine__process_kernel_mmap_event(machine, event);
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;
}
int machine__process_fork_event(struct machine *machine, union perf_event *event)
{
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 (thread == NULL || parent == NULL ||
thread__fork(thread, parent) < 0) {
dump_printf("problem processing PERF_RECORD_FORK, skipping event.\n");
return -1;
}
return 0;
}
int machine__process_exit_event(struct machine *machine, union perf_event *event)
{
struct thread *thread = machine__find_thread(machine, event->fork.tid);
if (dump_trace)
perf_event__fprintf_task(event, stdout);
if (thread != NULL)
machine__remove_thread(machine, thread);
return 0;
}
int machine__process_event(struct machine *machine, union perf_event *event)
{
int ret;
switch (event->header.type) {
case PERF_RECORD_COMM:
ret = machine__process_comm_event(machine, event); break;
case PERF_RECORD_MMAP:
ret = machine__process_mmap_event(machine, event); break;
case PERF_RECORD_FORK:
ret = machine__process_fork_event(machine, event); break;
case PERF_RECORD_EXIT:
ret = machine__process_exit_event(machine, event); break;
case PERF_RECORD_LOST:
ret = machine__process_lost_event(machine, event); break;
default:
ret = -1;
break;
}
return ret;
}