self->unknown_events = 0;
self->machines = RB_ROOT;
self->repipe = repipe;
- self->ordered_samples.flush_limit = ULLONG_MAX;
INIT_LIST_HEAD(&self->ordered_samples.samples_head);
machine__init(&self->host_machine, "", HOST_KERNEL_ID);
return 0;
}
+static int process_finished_round_stub(event_t *event __used,
+ struct perf_session *session __used,
+ struct perf_event_ops *ops __used)
+{
+ dump_printf(": unhandled!\n");
+ return 0;
+}
+
+static int process_finished_round(event_t *event,
+ struct perf_session *session,
+ struct perf_event_ops *ops);
+
static void perf_event_ops__fill_defaults(struct perf_event_ops *handler)
{
if (handler->sample == NULL)
handler->tracing_data = process_event_stub;
if (handler->build_id == NULL)
handler->build_id = process_event_stub;
+ if (handler->finished_round == NULL) {
+ if (handler->ordered_samples)
+ handler->finished_round = process_finished_round;
+ else
+ handler->finished_round = process_finished_round_stub;
+ }
}
static const char *event__name[] = {
struct list_head list;
};
-#define FLUSH_PERIOD (2 * NSEC_PER_SEC)
-
static void flush_sample_queue(struct perf_session *s,
struct perf_event_ops *ops)
{
struct list_head *head = &s->ordered_samples.samples_head;
- u64 limit = s->ordered_samples.flush_limit;
+ u64 limit = s->ordered_samples.next_flush;
struct sample_queue *tmp, *iter;
- if (!ops->ordered_samples)
+ if (!ops->ordered_samples || !limit)
return;
list_for_each_entry_safe(iter, tmp, head, list) {
}
}
+/*
+ * When perf record finishes a pass on every buffers, it records this pseudo
+ * event.
+ * We record the max timestamp t found in the pass n.
+ * Assuming these timestamps are monotonic across cpus, we know that if
+ * a buffer still has events with timestamps below t, they will be all
+ * available and then read in the pass n + 1.
+ * Hence when we start to read the pass n + 2, we can safely flush every
+ * events with timestamps below t.
+ *
+ * ============ PASS n =================
+ * CPU 0 | CPU 1
+ * |
+ * cnt1 timestamps | cnt2 timestamps
+ * 1 | 2
+ * 2 | 3
+ * - | 4 <--- max recorded
+ *
+ * ============ PASS n + 1 ==============
+ * CPU 0 | CPU 1
+ * |
+ * cnt1 timestamps | cnt2 timestamps
+ * 3 | 5
+ * 4 | 6
+ * 5 | 7 <---- max recorded
+ *
+ * Flush every events below timestamp 4
+ *
+ * ============ PASS n + 2 ==============
+ * CPU 0 | CPU 1
+ * |
+ * cnt1 timestamps | cnt2 timestamps
+ * 6 | 8
+ * 7 | 9
+ * - | 10
+ *
+ * Flush every events below timestamp 7
+ * etc...
+ */
+static int process_finished_round(event_t *event __used,
+ struct perf_session *session,
+ struct perf_event_ops *ops)
+{
+ flush_sample_queue(session, ops);
+ session->ordered_samples.next_flush = session->ordered_samples.max_timestamp;
+
+ return 0;
+}
+
static void __queue_sample_end(struct sample_queue *new, struct list_head *head)
{
struct sample_queue *iter;
}
static int queue_sample_event(event_t *event, struct sample_data *data,
- struct perf_session *s,
- struct perf_event_ops *ops)
+ struct perf_session *s)
{
u64 timestamp = data->time;
struct sample_queue *new;
- u64 flush_limit;
- if (s->ordered_samples.flush_limit == ULLONG_MAX)
- s->ordered_samples.flush_limit = timestamp + FLUSH_PERIOD;
-
if (timestamp < s->ordered_samples.last_flush) {
printf("Warning: Timestamp below last timeslice flush\n");
return -EINVAL;
__queue_sample_event(new, s);
s->ordered_samples.last_inserted = new;
- /*
- * We want to have a slice of events covering 2 * FLUSH_PERIOD
- * If FLUSH_PERIOD is big enough, it ensures every events that occured
- * in the first half of the timeslice have all been buffered and there
- * are none remaining (we need that because of the weakly ordered
- * event recording we have). Then once we reach the 2 * FLUSH_PERIOD
- * timeslice, we flush the first half to be gentle with the memory
- * (the second half can still get new events in the middle, so wait
- * another period to flush it)
- */
- flush_limit = s->ordered_samples.flush_limit;
-
- if (new->timestamp > flush_limit &&
- new->timestamp - flush_limit > FLUSH_PERIOD) {
- s->ordered_samples.flush_limit += FLUSH_PERIOD;
- flush_sample_queue(s, ops);
- }
+ if (new->timestamp > s->ordered_samples.max_timestamp)
+ s->ordered_samples.max_timestamp = new->timestamp;
return 0;
}
bzero(&data, sizeof(struct sample_data));
event__parse_sample(event, s->sample_type, &data);
- queue_sample_event(event, &data, s, ops);
+ queue_sample_event(event, &data, s);
return 0;
}
return ops->tracing_data(event, self);
case PERF_RECORD_HEADER_BUILD_ID:
return ops->build_id(event, self);
+ case PERF_RECORD_FINISHED_ROUND:
+ return ops->finished_round(event, self, ops);
default:
self->unknown_events++;
return -1;
p = &event;
p += sizeof(struct perf_event_header);
- err = do_read(self->fd, p, size - sizeof(struct perf_event_header));
- if (err <= 0) {
- if (err == 0) {
- pr_err("unexpected end of event stream\n");
- goto done;
- }
+ if (size - sizeof(struct perf_event_header)) {
+ err = do_read(self->fd, p,
+ size - sizeof(struct perf_event_header));
+ if (err <= 0) {
+ if (err == 0) {
+ pr_err("unexpected end of event stream\n");
+ goto done;
+ }
- pr_err("failed to read event data\n");
- goto out_err;
+ pr_err("failed to read event data\n");
+ goto out_err;
+ }
}
if (size == 0 ||
done:
err = 0;
/* do the final flush for ordered samples */
- self->ordered_samples.flush_limit = ULLONG_MAX;
+ self->ordered_samples.next_flush = ULLONG_MAX;
flush_sample_queue(self, ops);
out_err:
ui_progress__delete(progress);
git://bbs.cooldavid.org / net-next-2.6.git / blobdiff