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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,
unsigned long offset __used,
unsigned long head __used)
{
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 int
process_event(event_t *event, unsigned long offset, unsigned long head)
{
trace_event(event);
switch (event->header.type) {
case PERF_RECORD_SAMPLE:
return curr_handler->process_sample_event(event, offset, head);
case PERF_RECORD_MMAP:
return curr_handler->process_mmap_event(event, offset, head);
case PERF_RECORD_COMM:
return curr_handler->process_comm_event(event, offset, head);
case PERF_RECORD_FORK:
return curr_handler->process_fork_event(event, offset, head);
case PERF_RECORD_EXIT:
return curr_handler->process_exit_event(event, offset, head);
case PERF_RECORD_LOST:
return curr_handler->process_lost_event(event, offset, head);
case PERF_RECORD_READ:
return curr_handler->process_read_event(event, offset, head);
case PERF_RECORD_THROTTLE:
return curr_handler->process_throttle_event(event, offset, head);
case PERF_RECORD_UNTHROTTLE:
return curr_handler->process_unthrottle_event(event, offset, head);
default:
curr_handler->total_unknown++;
return -1;
}
}
int mmap_dispatch_perf_file(struct perf_header **pheader,
const char *input_name,
int force,
int full_paths,
int *cwdlen,
char **cwd)
{
int ret, rc = EXIT_FAILURE;
struct perf_header *header;
unsigned long head, shift;
unsigned long offset = 0;
struct stat input_stat;
size_t page_size;
u64 sample_type;
event_t *event;
uint32_t size;
int input;
char *buf;
if (!curr_handler)
die("Forgot to register perf file handler");
page_size = getpagesize();
input = open(input_name, O_RDONLY);
if (input < 0) {
fprintf(stderr, " failed to open file: %s", input_name);
if (!strcmp(input_name, "perf.data"))
fprintf(stderr, " (try 'perf record' first)");
fprintf(stderr, "\n");
exit(-1);
}
ret = fstat(input, &input_stat);
if (ret < 0) {
perror("failed to stat file");
exit(-1);
}
if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) {
fprintf(stderr, "file: %s not owned by current user or root\n",
input_name);
exit(-1);
}
if (!input_stat.st_size) {
fprintf(stderr, "zero-sized file, nothing to do!\n");
exit(0);
}
*pheader = perf_header__read(input);
header = *pheader;
head = header->data_offset;
sample_type = perf_header__sample_type(header);
if (curr_handler->sample_type_check)
if (curr_handler->sample_type_check(sample_type) < 0)
exit(-1);
if (load_kernel() < 0) {
perror("failed to load kernel symbols");
return EXIT_FAILURE;
}
if (!full_paths) {
if (getcwd(__cwd, sizeof(__cwd)) == NULL) {
perror("failed to get the current directory");
return EXIT_FAILURE;
}
*cwd = __cwd;
*cwdlen = strlen(*cwd);
} else {
*cwd = NULL;
*cwdlen = 0;
}
shift = page_size * (head / page_size);
offset += shift;
head -= shift;
remap:
buf = (char *)mmap(NULL, page_size * mmap_window, PROT_READ,
MAP_SHARED, input, offset);
if (buf == MAP_FAILED) {
perror("failed to mmap file");
exit(-1);
}
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, 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 >= header->data_offset + header->data_size)
goto done;
if (offset + head < (unsigned long)input_stat.st_size)
goto more;
done:
rc = EXIT_SUCCESS;
close(input);
return rc;
}
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