X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=lttng-context-vppid.c;h=06377a3098ff7f72b992f0c9848f693fbc10f7dc;hb=1638c9b4fa42c188ffa962552146537f8fb3d26e;hp=365d97394e89c98094b43dacc5918ee353271c00;hpb=3d0d43dbac505d33994f5a57f4f11021410fa417;p=lttng-modules.git

diff --git a/lttng-context-vppid.c b/lttng-context-vppid.c
index 365d9739..06377a30 100644
--- a/lttng-context-vppid.c
+++ b/lttng-context-vppid.c
@@ -51,6 +51,15 @@ void vppid_record(struct lttng_ctx_field *field,
 	 * current nsproxy can be NULL when scheduled out of exit. pid_vnr uses
 	 * the current thread nsproxy to perform the lookup.
 	 */
+
+	/*
+	 * TODO: when we eventually add RCU subsystem instrumentation,
+	 * taking the rcu read lock here will trigger RCU tracing
+	 * recursively. We should modify the kernel synchronization so
+	 * it synchronizes both for RCU and RCU sched, and rely on
+	 * rcu_read_lock_sched_notrace.
+	 */
+
 	rcu_read_lock();
 	parent = rcu_dereference(current->real_parent);
 	if (!current->nsproxy)