X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Fust-app.c;h=0ffcb3b6ab7e60a6fb44780413183803d923a462;hb=823fa2fab52001dd39b07ea4c7d806b859f7ee9e;hp=f0e61808ab6e9ee5e66e3bdf602333ed8e98a1fd;hpb=08ddb31a5e8c3f69899f464d0b85605b4cdebbe5;p=lttng-tools.git

diff --git a/src/bin/lttng-sessiond/ust-app.c b/src/bin/lttng-sessiond/ust-app.c
index f0e61808a..0ffcb3b6a 100644
--- a/src/bin/lttng-sessiond/ust-app.c
+++ b/src/bin/lttng-sessiond/ust-app.c
@@ -2398,6 +2398,7 @@ static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess,
 	assert(reg_chan);
 	reg_chan->consumer_key = ua_chan->key;
 	reg_chan->subbuf_size = ua_chan->attr.subbuf_size;
+	reg_chan->num_subbuf = ua_chan->attr.num_subbuf;
 
 	/* Create and add a channel registry to session. */
 	ret = ust_registry_channel_add(reg_sess->reg.ust,
@@ -5045,7 +5046,8 @@ void ust_app_destroy(struct ust_app *app)
  * Return 0 on success or else a negative value.
  */
 int ust_app_snapshot_record(struct ltt_ust_session *usess,
-		struct snapshot_output *output, int wait, uint64_t max_stream_size)
+		struct snapshot_output *output, int wait,
+		uint64_t nb_packets_per_stream)
 {
 	int ret = 0;
 	unsigned int snapshot_done = 0;
@@ -5089,14 +5091,14 @@ int ust_app_snapshot_record(struct ltt_ust_session *usess,
 					reg_chan, node.node) {
 				ret = consumer_snapshot_channel(socket, reg_chan->consumer_key,
 						output, 0, usess->uid, usess->gid, pathname, wait,
-						max_stream_size);
+						nb_packets_per_stream);
 				if (ret < 0) {
 					goto error;
 				}
 			}
 			ret = consumer_snapshot_channel(socket,
 					reg->registry->reg.ust->metadata_key, output, 1,
-					usess->uid, usess->gid, pathname, wait, max_stream_size);
+					usess->uid, usess->gid, pathname, wait, 0);
 			if (ret < 0) {
 				goto error;
 			}
@@ -5140,7 +5142,7 @@ int ust_app_snapshot_record(struct ltt_ust_session *usess,
 					ua_chan, node.node) {
 				ret = consumer_snapshot_channel(socket, ua_chan->key, output,
 						0, ua_sess->euid, ua_sess->egid, pathname, wait,
-						max_stream_size);
+						nb_packets_per_stream);
 				if (ret < 0) {
 					goto error;
 				}
@@ -5149,8 +5151,7 @@ int ust_app_snapshot_record(struct ltt_ust_session *usess,
 			registry = get_session_registry(ua_sess);
 			assert(registry);
 			ret = consumer_snapshot_channel(socket, registry->metadata_key, output,
-					1, ua_sess->euid, ua_sess->egid, pathname, wait,
-					max_stream_size);
+					1, ua_sess->euid, ua_sess->egid, pathname, wait, 0);
 			if (ret < 0) {
 				goto error;
 			}
@@ -5178,11 +5179,12 @@ error:
 }
 
 /*
- * Return the number of streams for a UST session.
+ * Return the size taken by one more packet per stream.
  */
-unsigned int ust_app_get_nb_stream(struct ltt_ust_session *usess)
+uint64_t ust_app_get_size_one_more_packet_per_stream(struct ltt_ust_session *usess,
+		uint64_t cur_nr_packets)
 {
-	unsigned int ret = 0;
+	uint64_t tot_size = 0;
 	struct ust_app *app;
 	struct lttng_ht_iter iter;
 
@@ -5199,7 +5201,14 @@ unsigned int ust_app_get_nb_stream(struct ltt_ust_session *usess)
 			rcu_read_lock();
 			cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter,
 					reg_chan, node.node) {
-				ret += reg_chan->stream_count;
+				if (cur_nr_packets >= reg_chan->num_subbuf) {
+					/*
+					 * Don't take channel into account if we
+					 * already grab all its packets.
+					 */
+					continue;
+				}
+				tot_size += reg_chan->subbuf_size * reg_chan->stream_count;
 			}
 			rcu_read_unlock();
 		}
@@ -5221,7 +5230,14 @@ unsigned int ust_app_get_nb_stream(struct ltt_ust_session *usess)
 
 			cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter,
 					ua_chan, node.node) {
-				ret += ua_chan->streams.count;
+				if (cur_nr_packets >= ua_chan->attr.num_subbuf) {
+					/*
+					 * Don't take channel into account if we
+					 * already grab all its packets.
+					 */
+					continue;
+				}
+				tot_size += ua_chan->attr.subbuf_size * ua_chan->streams.count;
 			}
 		}
 		rcu_read_unlock();
@@ -5232,5 +5248,5 @@ unsigned int ust_app_get_nb_stream(struct ltt_ust_session *usess)
 		break;
 	}
 
-	return ret;
+	return tot_size;
 }