void perf_event::set_event_name(const char *event_name)
{
if (name)
free(name);
name = strdup(event_name);
char *c;
c = strchr(name, ':');
if (c)
*c = '/';
trace_type = get_trace_type(name);
}
void perf_event::set_event_name(const char *event_name)
{
if (name)
free(name);
name = strdup(event_name);
if (!name) {
fprintf(stderr, "failed to allocate event name\n");
return;
}
char *c;
c = strchr(name, ':');
if (c)
*c = '/';
trace_type = get_trace_type(name);
}
static void create_perf_event(void)
{
struct perf_event_attr attr;
int ret;
struct {
__u64 count;
__u64 time_enabled;
__u64 time_running;
__u64 id;
} read_data;
memset(&attr, 0, sizeof(attr));
attr.read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
PERF_FORMAT_TOTAL_TIME_RUNNING |
PERF_FORMAT_ID;
attr.sample_freq = 0;
attr.sample_period = 1;
attr.sample_type |= PERF_SAMPLE_RAW;
attr.mmap = 1;
attr.comm = 1;
attr.inherit = 0;
attr.disabled = 1;
attr.type = PERF_TYPE_TRACEPOINT;
attr.config = get_trace_type();
if (attr.config <= 0)
return;
perf_fd = sys_perf_event_open(&attr, -1, 0, -1, 0);
if (perf_fd < 0) {
fprintf(stderr, "Perf syscall failed: %i / %i (%s)\n", perf_fd, errno, strerror(errno));
return;
}
if (read(perf_fd, &read_data, sizeof(read_data)) == -1) {
perror("Unable to read perf file descriptor\n");
exit(-1);
}
fcntl(perf_fd, F_SETFL, O_NONBLOCK);
perf_mmap = mmap(NULL, (128+1)*getpagesize(),
PROT_READ | PROT_WRITE, MAP_SHARED, perf_fd, 0);
if (perf_mmap == MAP_FAILED) {
fprintf(stderr, "failed to mmap with %d (%s)\n", errno, strerror(errno));
return;
}
ret = ioctl(perf_fd, PERF_EVENT_IOC_ENABLE);
if (ret < 0)
fprintf(stderr, "failed to enable perf \n");
pc = perf_mmap;
data_mmap = perf_mmap + getpagesize();
}
