X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Fkernel.c;h=ddf01044c816f179b668525c5463c60a6f3483c2;hp=6f2604c607d2c1bc5fe4c24a53a2cf0458a4053d;hb=5c786dedd0156b93984f89ba47ec841277ed7dae;hpb=5f4c2d807e49a7d1a5e149615d37ee824f0155a6

diff --git a/src/bin/lttng-sessiond/kernel.c b/src/bin/lttng-sessiond/kernel.c
index 6f2604c60..ddf01044c 100644
--- a/src/bin/lttng-sessiond/kernel.c
+++ b/src/bin/lttng-sessiond/kernel.c
@@ -822,12 +822,13 @@ void kernel_destroy_channel(struct ltt_kernel_channel *kchan)
  * Return 0 on success or else a negative value.
  */
 int kernel_snapshot_record(struct ltt_kernel_session *ksess,
-		struct snapshot_output *output, int wait)
+		struct snapshot_output *output, int wait, unsigned int nb_streams)
 {
 	int ret, saved_metadata_fd;
 	struct consumer_socket *socket;
 	struct lttng_ht_iter iter;
 	struct ltt_kernel_metadata *saved_metadata;
+	uint64_t max_size_per_stream = 0;
 
 	assert(ksess);
 	assert(ksess->consumer);
@@ -853,6 +854,10 @@ int kernel_snapshot_record(struct ltt_kernel_session *ksess,
 		goto error_open_stream;
 	}
 
+	if (output->max_size > 0 && nb_streams > 0) {
+		max_size_per_stream = output->max_size / nb_streams;
+	}
+
 	/* Send metadata to consumer and snapshot everything. */
 	cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
 			socket, node.node) {
@@ -881,9 +886,20 @@ int kernel_snapshot_record(struct ltt_kernel_session *ksess,
 
 		/* For each channel, ask the consumer to snapshot it. */
 		cds_list_for_each_entry(chan, &ksess->channel_list.head, list) {
+			if (max_size_per_stream &&
+					chan->channel->attr.subbuf_size > max_size_per_stream) {
+				ret = LTTNG_ERR_INVALID;
+				DBG3("Kernel snapshot record maximum stream size %" PRIu64
+						" is smaller than subbuffer size of %" PRIu64,
+						max_size_per_stream, chan->channel->attr.subbuf_size);
+				goto error_consumer;
+			}
+
 			pthread_mutex_lock(socket->lock);
 			ret = consumer_snapshot_channel(socket, chan->fd, output, 0,
-					ksess->uid, ksess->gid, DEFAULT_KERNEL_TRACE_DIR, wait);
+					ksess->uid, ksess->gid,
+					DEFAULT_KERNEL_TRACE_DIR, wait,
+					max_size_per_stream);
 			pthread_mutex_unlock(socket->lock);
 			if (ret < 0) {
 				ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
@@ -894,7 +910,8 @@ int kernel_snapshot_record(struct ltt_kernel_session *ksess,
 		/* Snapshot metadata, */
 		pthread_mutex_lock(socket->lock);
 		ret = consumer_snapshot_channel(socket, ksess->metadata->fd, output,
-				1, ksess->uid, ksess->gid, DEFAULT_KERNEL_TRACE_DIR, wait);
+				1, ksess->uid, ksess->gid,
+				DEFAULT_KERNEL_TRACE_DIR, wait, max_size_per_stream);
 		pthread_mutex_unlock(socket->lock);
 		if (ret < 0) {
 			ret = LTTNG_ERR_KERN_CONSUMER_FAIL;