X-Git-Url: http://git.lttng.org./?a=blobdiff_plain;f=include%2Flttng%2Fust-tracer.h;h=7e6a25139593de9918f5b4f6df01336403461ab2;hb=7075c5a2f8f4f90a018d7d1ea8c6dadda609495d;hp=cc5f93e4f7bb31cd6ee9a08f4c874d3ac73af80b;hpb=dc325c1d762bbbdc1866e590f4649078f8600664;p=lttng-ust.git

diff --git a/include/lttng/ust-tracer.h b/include/lttng/ust-tracer.h
index cc5f93e4..7e6a2513 100644
--- a/include/lttng/ust-tracer.h
+++ b/include/lttng/ust-tracer.h
@@ -15,9 +15,14 @@
 #include <lttng/ust-version.h>
 
 /*
- * Default to having the content of the ringbuffer respect the natural
- * alignment of the system. Only pack its content on architectures we know
- * have efficient unaligned memory access.
+ * On architectures without efficient unaligned accesses, the layout of
+ * the ringbuffer's content respects the natural alignment of the
+ * system. Only pack its content on architectures we know have efficient
+ * unaligned memory access.
+ *
+ * Whether to pack the ring buffer contents or not is part of the ABI
+ * between the probe providers and the tracer, and is selected by the
+ * lttng/ust-arch.h header.
  */
 #ifndef LTTNG_UST_ARCH_HAS_EFFICIENT_UNALIGNED_ACCESS
 #define LTTNG_UST_RING_BUFFER_NATURAL_ALIGN