X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=lib%2Fringbuffer%2Ffrontend_types.h;h=3fd634524f8ab9b59e59eed14f4adb6e169a4d5a;hb=b7cdc18250880cc44edeef4a4b42c8ac7a135a6d;hp=2b0c93291429d6139dffdeda7490bf1b62715e8d;hpb=9f36eaed6f91d5897924b551b44d1edd8cee00e2;p=lttng-modules.git

diff --git a/lib/ringbuffer/frontend_types.h b/lib/ringbuffer/frontend_types.h
index 2b0c9329..3fd63452 100644
--- a/lib/ringbuffer/frontend_types.h
+++ b/lib/ringbuffer/frontend_types.h
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: (GPL-2.0 OR LGPL-2.1)
+/* SPDX-License-Identifier: (GPL-2.0-only OR LGPL-2.1-only)
  *
  * lib/ringbuffer/frontend_types.h
  *
@@ -15,7 +15,6 @@
 #include <linux/kref.h>
 #include <wrapper/ringbuffer/config.h>
 #include <wrapper/ringbuffer/backend_types.h>
-#include <wrapper/spinlock.h>
 #include <lib/prio_heap/lttng_prio_heap.h>	/* For per-CPU read-side iterator */
 #include <lttng-cpuhotplug.h>
 
@@ -121,6 +120,20 @@ struct lib_ring_buffer {
 
 	struct commit_counters_cold *commit_cold;
 					/* Commit count per sub-buffer */
+	u64 *ts_end;			/*
+					 * timestamp_end per sub-buffer.
+					 * Time is sampled by the
+					 * switch_*_end() callbacks which
+					 * are the last space reservation
+					 * performed in the sub-buffer
+					 * before it can be fully
+					 * committed and delivered. This
+					 * time value is then read by
+					 * the deliver callback,
+					 * performed by the last commit
+					 * before the buffer becomes
+					 * readable.
+					 */
 	atomic_long_t active_readers;	/*
 					 * Active readers count
 					 * standard atomic access (shared)