blob: 4f2eeb584da87ea6dd95bb3a3b2c686d110778a4 [file] [log] [blame]
#include <linux/kernel.h>
#include <unistd.h>
#include <sys/types.h>
#include "session.h"
#include "sort.h"
#include "util.h"
static int perf_session__open(struct perf_session *self, bool force)
{
struct stat input_stat;
self->fd = open(self->filename, O_RDONLY);
if (self->fd < 0) {
pr_err("failed to open file: %s", self->filename);
if (!strcmp(self->filename, "perf.data"))
pr_err(" (try 'perf record' first)");
pr_err("\n");
return -errno;
}
if (fstat(self->fd, &input_stat) < 0)
goto out_close;
if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) {
pr_err("file %s not owned by current user or root\n",
self->filename);
goto out_close;
}
if (!input_stat.st_size) {
pr_info("zero-sized file (%s), nothing to do!\n",
self->filename);
goto out_close;
}
if (perf_header__read(&self->header, self->fd) < 0) {
pr_err("incompatible file format");
goto out_close;
}
self->size = input_stat.st_size;
return 0;
out_close:
close(self->fd);
self->fd = -1;
return -1;
}
struct perf_session *perf_session__new(const char *filename, int mode, bool force)
{
size_t len = filename ? strlen(filename) + 1 : 0;
struct perf_session *self = zalloc(sizeof(*self) + len);
if (self == NULL)
goto out;
if (perf_header__init(&self->header) < 0)
goto out_free;
memcpy(self->filename, filename, len);
self->threads = RB_ROOT;
self->last_match = NULL;
self->mmap_window = 32;
self->cwd = NULL;
self->cwdlen = 0;
self->unknown_events = 0;
map_groups__init(&self->kmaps);
if (perf_session__create_kernel_maps(self) < 0)
goto out_delete;
if (mode == O_RDONLY && perf_session__open(self, force) < 0)
goto out_delete;
self->sample_type = perf_header__sample_type(&self->header);
out:
return self;
out_free:
free(self);
return NULL;
out_delete:
perf_session__delete(self);
return NULL;
}
void perf_session__delete(struct perf_session *self)
{
perf_header__exit(&self->header);
close(self->fd);
free(self->cwd);
free(self);
}
static bool symbol__match_parent_regex(struct symbol *sym)
{
if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0))
return 1;
return 0;
}
struct symbol **perf_session__resolve_callchain(struct perf_session *self,
struct thread *thread,
struct ip_callchain *chain,
struct symbol **parent)
{
u8 cpumode = PERF_RECORD_MISC_USER;
struct symbol **syms = NULL;
unsigned int i;
if (symbol_conf.use_callchain) {
syms = calloc(chain->nr, sizeof(*syms));
if (!syms) {
fprintf(stderr, "Can't allocate memory for symbols\n");
exit(-1);
}
}
for (i = 0; i < chain->nr; i++) {
u64 ip = chain->ips[i];
struct addr_location al;
if (ip >= PERF_CONTEXT_MAX) {
switch (ip) {
case PERF_CONTEXT_HV:
cpumode = PERF_RECORD_MISC_HYPERVISOR; break;
case PERF_CONTEXT_KERNEL:
cpumode = PERF_RECORD_MISC_KERNEL; break;
case PERF_CONTEXT_USER:
cpumode = PERF_RECORD_MISC_USER; break;
default:
break;
}
continue;
}
thread__find_addr_location(thread, self, cpumode,
MAP__FUNCTION, ip, &al, NULL);
if (al.sym != NULL) {
if (sort__has_parent && !*parent &&
symbol__match_parent_regex(al.sym))
*parent = al.sym;
if (!symbol_conf.use_callchain)
break;
syms[i] = al.sym;
}
}
return syms;
}
static int process_event_stub(event_t *event __used,
struct perf_session *session __used)
{
dump_printf(": unhandled!\n");
return 0;
}
static void perf_event_ops__fill_defaults(struct perf_event_ops *handler)
{
if (handler->process_sample_event == NULL)
handler->process_sample_event = process_event_stub;
if (handler->process_mmap_event == NULL)
handler->process_mmap_event = process_event_stub;
if (handler->process_comm_event == NULL)
handler->process_comm_event = process_event_stub;
if (handler->process_fork_event == NULL)
handler->process_fork_event = process_event_stub;
if (handler->process_exit_event == NULL)
handler->process_exit_event = process_event_stub;
if (handler->process_lost_event == NULL)
handler->process_lost_event = process_event_stub;
if (handler->process_read_event == NULL)
handler->process_read_event = process_event_stub;
if (handler->process_throttle_event == NULL)
handler->process_throttle_event = process_event_stub;
if (handler->process_unthrottle_event == NULL)
handler->process_unthrottle_event = process_event_stub;
}
static const char *event__name[] = {
[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",
};
unsigned long event__total[PERF_RECORD_MAX];
void event__print_totals(void)
{
int i;
for (i = 0; i < PERF_RECORD_MAX; ++i)
pr_info("%10s events: %10ld\n",
event__name[i], event__total[i]);
}
static int perf_session__process_event(struct perf_session *self,
event_t *event,
struct perf_event_ops *ops,
unsigned long offset, unsigned long head)
{
trace_event(event);
if (event->header.type < PERF_RECORD_MAX) {
dump_printf("%p [%p]: PERF_RECORD_%s",
(void *)(offset + head),
(void *)(long)(event->header.size),
event__name[event->header.type]);
++event__total[0];
++event__total[event->header.type];
}
switch (event->header.type) {
case PERF_RECORD_SAMPLE:
return ops->process_sample_event(event, self);
case PERF_RECORD_MMAP:
return ops->process_mmap_event(event, self);
case PERF_RECORD_COMM:
return ops->process_comm_event(event, self);
case PERF_RECORD_FORK:
return ops->process_fork_event(event, self);
case PERF_RECORD_EXIT:
return ops->process_exit_event(event, self);
case PERF_RECORD_LOST:
return ops->process_lost_event(event, self);
case PERF_RECORD_READ:
return ops->process_read_event(event, self);
case PERF_RECORD_THROTTLE:
return ops->process_throttle_event(event, self);
case PERF_RECORD_UNTHROTTLE:
return ops->process_unthrottle_event(event, self);
default:
self->unknown_events++;
return -1;
}
}
int perf_header__read_build_ids(int input, u64 offset, u64 size)
{
struct build_id_event bev;
char filename[PATH_MAX];
u64 limit = offset + size;
int err = -1;
while (offset < limit) {
struct dso *dso;
ssize_t len;
if (read(input, &bev, sizeof(bev)) != sizeof(bev))
goto out;
len = bev.header.size - sizeof(bev);
if (read(input, filename, len) != len)
goto out;
dso = dsos__findnew(filename);
if (dso != NULL)
dso__set_build_id(dso, &bev.build_id);
offset += bev.header.size;
}
err = 0;
out:
return err;
}
static struct thread *perf_session__register_idle_thread(struct perf_session *self)
{
struct thread *thread = perf_session__findnew(self, 0);
if (thread == NULL || thread__set_comm(thread, "swapper")) {
pr_err("problem inserting idle task.\n");
thread = NULL;
}
return thread;
}
int perf_session__process_events(struct perf_session *self,
struct perf_event_ops *ops)
{
int err;
unsigned long head, shift;
unsigned long offset = 0;
size_t page_size;
event_t *event;
uint32_t size;
char *buf;
if (perf_session__register_idle_thread(self) == NULL)
return -ENOMEM;
perf_event_ops__fill_defaults(ops);
page_size = getpagesize();
head = self->header.data_offset;
if (!symbol_conf.full_paths) {
char bf[PATH_MAX];
if (getcwd(bf, sizeof(bf)) == NULL) {
err = -errno;
out_getcwd_err:
pr_err("failed to get the current directory\n");
goto out_err;
}
self->cwd = strdup(bf);
if (self->cwd == NULL) {
err = -ENOMEM;
goto out_getcwd_err;
}
self->cwdlen = strlen(self->cwd);
}
shift = page_size * (head / page_size);
offset += shift;
head -= shift;
remap:
buf = mmap(NULL, page_size * self->mmap_window, PROT_READ,
MAP_SHARED, self->fd, offset);
if (buf == MAP_FAILED) {
pr_err("failed to mmap file\n");
err = -errno;
goto out_err;
}
more:
event = (event_t *)(buf + head);
size = event->header.size;
if (size == 0)
size = 8;
if (head + event->header.size >= page_size * self->mmap_window) {
int munmap_ret;
shift = page_size * (head / page_size);
munmap_ret = munmap(buf, page_size * self->mmap_window);
assert(munmap_ret == 0);
offset += shift;
head -= shift;
goto remap;
}
size = event->header.size;
dump_printf("\n%p [%p]: event: %d\n",
(void *)(offset + head),
(void *)(long)event->header.size,
event->header.type);
if (size == 0 ||
perf_session__process_event(self, event, ops, offset, head) < 0) {
dump_printf("%p [%p]: skipping unknown header type: %d\n",
(void *)(offset + head),
(void *)(long)(event->header.size),
event->header.type);
/*
* assume we lost track of the stream, check alignment, and
* increment a single u64 in the hope to catch on again 'soon'.
*/
if (unlikely(head & 7))
head &= ~7ULL;
size = 8;
}
head += size;
if (offset + head >= self->header.data_offset + self->header.data_size)
goto done;
if (offset + head < self->size)
goto more;
done:
err = 0;
out_err:
return err;
}
bool perf_session__has_traces(struct perf_session *self, const char *msg)
{
if (!(self->sample_type & PERF_SAMPLE_RAW)) {
pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg);
return false;
}
return true;
}