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#include "data_map.h"
#include "symbol.h"
#include "util.h"
#include "debug.h"
static struct perf_file_handler *curr_handler;
static unsigned long mmap_window = 32;
static char __cwd[PATH_MAX];
static int process_event_stub(event_t *event __used,
struct perf_session *session __used)
{
dump_printf(": unhandled!\n");
return 0;
}
void register_perf_file_handler(struct perf_file_handler *handler)
{
if (!handler->process_sample_event)
handler->process_sample_event = process_event_stub;
if (!handler->process_mmap_event)
handler->process_mmap_event = process_event_stub;
if (!handler->process_comm_event)
handler->process_comm_event = process_event_stub;
if (!handler->process_fork_event)
handler->process_fork_event = process_event_stub;
if (!handler->process_exit_event)
handler->process_exit_event = process_event_stub;
if (!handler->process_lost_event)
handler->process_lost_event = process_event_stub;
if (!handler->process_read_event)
handler->process_read_event = process_event_stub;
if (!handler->process_throttle_event)
handler->process_throttle_event = process_event_stub;
if (!handler->process_unthrottle_event)
handler->process_unthrottle_event = process_event_stub;
curr_handler = handler;
}
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 process_event(event_t *event, struct perf_session *session,
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 curr_handler->process_sample_event(event, session);
case PERF_RECORD_MMAP:
return curr_handler->process_mmap_event(event, session);
case PERF_RECORD_COMM:
return curr_handler->process_comm_event(event, session);
case PERF_RECORD_FORK:
return curr_handler->process_fork_event(event, session);
case PERF_RECORD_EXIT:
return curr_handler->process_exit_event(event, session);
case PERF_RECORD_LOST:
return curr_handler->process_lost_event(event, session);
case PERF_RECORD_READ:
return curr_handler->process_read_event(event, session);
case PERF_RECORD_THROTTLE:
return curr_handler->process_throttle_event(event, session);
case PERF_RECORD_UNTHROTTLE:
return curr_handler->process_unthrottle_event(event, session);
default:
curr_handler->total_unknown++;
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;
}
int perf_session__process_events(struct perf_session *self,
int full_paths, int *cwdlen, char **cwd)
{
int err;
unsigned long head, shift;
unsigned long offset = 0;
size_t page_size;
u64 sample_type;
event_t *event;
uint32_t size;
char *buf;
if (curr_handler == NULL) {
pr_debug("Forgot to register perf file handler\n");
return -EINVAL;
}
page_size = getpagesize();
head = self->header.data_offset;
sample_type = perf_header__sample_type(&self->header);
err = -EINVAL;
if (curr_handler->sample_type_check &&
curr_handler->sample_type_check(sample_type) < 0)
goto out_err;
if (!full_paths) {
if (getcwd(__cwd, sizeof(__cwd)) == NULL) {
pr_err("failed to get the current directory\n");
err = -errno;
goto out_err;
}
*cwd = __cwd;
*cwdlen = strlen(*cwd);
} else {
*cwd = NULL;
*cwdlen = 0;
}
shift = page_size * (head / page_size);
offset += shift;
head -= shift;
remap:
buf = mmap(NULL, page_size * 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)
size = 8;
if (head + event->header.size >= page_size * mmap_window) {
int munmap_ret;
shift = page_size * (head / page_size);
munmap_ret = munmap(buf, page_size * 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 || process_event(event, self, 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;
}
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