X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;ds=sidebyside;f=include%2Fringbuffer%2Fconfig.h;h=ccb683371cd9ec52176909f59e8a348dbfb01776;hb=3b82c4e1b18900cc7ad4045b9173cabfaa498852;hp=1549c1089e09a9d9ba399fe42195ad027c15a612;hpb=a071f25d89c4ef76ffe7bdfcaeb783bc9cfc1211;p=lttng-modules.git

diff --git a/include/ringbuffer/config.h b/include/ringbuffer/config.h
index 1549c108..ccb68337 100644
--- a/include/ringbuffer/config.h
+++ b/include/ringbuffer/config.h
@@ -14,7 +14,7 @@
 #include <linux/types.h>
 #include <linux/percpu.h>
 #include <lttng/align.h>
-#include <lttng-tracer-core.h>
+#include <lttng/tracer-core.h>
 
 struct lib_ring_buffer;
 struct channel;
@@ -101,7 +101,9 @@ struct lib_ring_buffer_client_cb {
  *
  * RING_BUFFER_WAKEUP_BY_WRITER directly wakes up readers when a subbuffer is
  * ready to read. Lower latencies before the reader is woken up. Mainly suitable
- * for drivers.
+ * for drivers. Going through an "irq_work" allows triggering this type of wakeup
+ * even from NMI context: the wakeup will be slightly delayed until the next
+ * interrupts are handled.
  *
  * RING_BUFFER_WAKEUP_NONE does not perform any wakeup whatsoever. The client
  * has the responsibility to perform wakeups.
@@ -142,9 +144,8 @@ struct lib_ring_buffer_config {
 	enum {
 		RING_BUFFER_WAKEUP_BY_TIMER,	/* wake up performed by timer */
 		RING_BUFFER_WAKEUP_BY_WRITER,	/*
-						 * writer wakes up reader,
-						 * not lock-free
-						 * (takes spinlock).
+						 * writer wakes up reader through
+						 * irq_work.
 						 */
 	} wakeup;
 	/*
@@ -234,7 +235,7 @@ void lib_ring_buffer_ctx_init(struct lib_ring_buffer_ctx *ctx,
 #define RING_BUFFER_RFLAG_END			(1U << 1)
 
 #ifndef LTTNG_TRACER_CORE_H
-#error "lttng-tracer-core.h is needed for RING_BUFFER_ALIGN define"
+#error "lttng/tracer-core.h is needed for RING_BUFFER_ALIGN define"
 #endif
 
 /*