X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Fkernel.c;h=4bb418949d3ea330b60397ed2352f5541c7fcbdc;hp=00bfbbc2be5400d460e2c7dd7c273335f7d444b4;hb=ccf10263bcd2ca4667b9e1fc4dab64a3c8d8c4d8;hpb=c052142c0fb4ce4cd13999218852ceb2d07ea51e

diff --git a/src/bin/lttng-sessiond/kernel.c b/src/bin/lttng-sessiond/kernel.c
index 00bfbbc2b..4bb418949 100644
--- a/src/bin/lttng-sessiond/kernel.c
+++ b/src/bin/lttng-sessiond/kernel.c
@@ -16,6 +16,7 @@
  */
 
 #define _GNU_SOURCE
+#define _LGPL_SOURCE
 #include <errno.h>
 #include <fcntl.h>
 #include <stdlib.h>
@@ -173,6 +174,7 @@ error:
 /*
  * Create a kernel event, enable it to the kernel tracer and add it to the
  * channel event list of the kernel session.
+ * We own filter_expression and filter.
  */
 int kernel_create_event(struct lttng_event *ev,
 		struct ltt_kernel_channel *channel)
@@ -365,6 +367,20 @@ int kernel_disable_syscall(const char *syscall_name,
 	return kernctl_disable_syscall(channel->fd, syscall_name);
 }
 
+int kernel_track_pid(struct ltt_kernel_session *session, int pid)
+{
+	DBG("Kernel track PID %d for session id %" PRIu64 ".",
+			pid, session->id);
+	return kernctl_track_pid(session->fd, pid);
+}
+
+int kernel_untrack_pid(struct ltt_kernel_session *session, int pid)
+{
+	DBG("Kernel untrack PID %d for session id %" PRIu64 ".",
+			pid, session->id);
+	return kernctl_untrack_pid(session->fd, pid);
+}
+
 /*
  * Create kernel metadata, open from the kernel tracer and add it to the
  * kernel session.
@@ -792,6 +808,7 @@ void kernel_destroy_session(struct ltt_kernel_session *ksess)
 		struct lttng_ht_iter iter;
 
 		/* For each consumer socket. */
+		rcu_read_lock();
 		cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
 				socket, node.node) {
 			struct ltt_kernel_channel *chan;
@@ -805,6 +822,7 @@ void kernel_destroy_session(struct ltt_kernel_session *ksess)
 				}
 			}
 		}
+		rcu_read_unlock();
 	}
 
 	/* Close any relayd session */
@@ -849,7 +867,8 @@ void kernel_destroy_channel(struct ltt_kernel_channel *kchan)
  * Return 0 on success or else return a LTTNG_ERR code.
  */
 int kernel_snapshot_record(struct ltt_kernel_session *ksess,
-		struct snapshot_output *output, int wait, uint64_t max_size_per_stream)
+		struct snapshot_output *output, int wait,
+		uint64_t nb_packets_per_stream)
 {
 	int err, ret, saved_metadata_fd;
 	struct consumer_socket *socket;
@@ -910,7 +929,7 @@ int kernel_snapshot_record(struct ltt_kernel_session *ksess,
 			ret = consumer_snapshot_channel(socket, chan->fd, output, 0,
 					ksess->uid, ksess->gid,
 					DEFAULT_KERNEL_TRACE_DIR, wait,
-					max_size_per_stream);
+					nb_packets_per_stream);
 			pthread_mutex_unlock(socket->lock);
 			if (ret < 0) {
 				ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
@@ -924,7 +943,7 @@ int kernel_snapshot_record(struct ltt_kernel_session *ksess,
 		pthread_mutex_lock(socket->lock);
 		ret = consumer_snapshot_channel(socket, ksess->metadata->fd, output,
 				1, ksess->uid, ksess->gid,
-				DEFAULT_KERNEL_TRACE_DIR, wait, max_size_per_stream);
+				DEFAULT_KERNEL_TRACE_DIR, wait, 0);
 		pthread_mutex_unlock(socket->lock);
 		if (ret < 0) {
 			ret = LTTNG_ERR_KERN_CONSUMER_FAIL;