Add __field_hex

[lttng-modules.git] / ltt-ring-buffer-client.h

diff --git a/ltt-ring-buffer-client.h b/ltt-ring-buffer-client.h
index 30f0104fdc46728468f78ddb3c33b977178a87de..dc6bbd0bb51480a78141ba7bb82be8b89e0fcd3e 100644 (file)
--- a/ltt-ring-buffer-client.h
+++ b/ltt-ring-buffer-client.h
@@ -22,6 +22,14 @@
  * you ever add/remove a field from this header. Packed attribute is not used
  * because gcc generates poor code on at least powerpc and mips. Don't ever
  * let gcc add padding between the structure elements.
+ *
+ * The guarantee we have with timestamps is that all the events in a
+ * packet are included (inclusive) within the begin/end timestamps of
+ * the packet. Another guarantee we have is that the "timestamp begin",
+ * as well as the event timestamps, are monotonically increasing (never
+ * decrease) when moving forward in a stream (physically). But this
+ * guarantee does not apply to "timestamp end", because it is sampled at
+ * commit time, which is not ordered with respect to space reservation.
  */
 
 struct packet_header {
@@ -471,9 +479,11 @@ void ltt_event_write(struct lib_ring_buffer_ctx *ctx, const void *src,
 }
 
 static
-wait_queue_head_t *ltt_get_reader_wait_queue(struct channel *chan)
+wait_queue_head_t *ltt_get_writer_buf_wait_queue(struct channel *chan, int cpu)
 {
-       return &chan->read_wait;
+       struct lib_ring_buffer *buf = channel_get_ring_buffer(&client_config,
+                                       chan, cpu);
+       return &buf->write_wait;
 }
 
 static
@@ -508,7 +518,7 @@ static struct ltt_transport ltt_relay_transport = {
                .event_commit = ltt_event_commit,
                .event_write = ltt_event_write,
                .packet_avail_size = NULL,      /* Would be racy anyway */
-               .get_reader_wait_queue = ltt_get_reader_wait_queue,
+               .get_writer_buf_wait_queue = ltt_get_writer_buf_wait_queue,
                .get_hp_wait_queue = ltt_get_hp_wait_queue,
                .is_finalized = ltt_is_finalized,
                .is_disabled = ltt_is_disabled,