From 6879e0242ef2072ab16915640e2f5f7713020049 Mon Sep 17 00:00:00 2001
From: Matthias Knorr <MKKnorr@web.de>
Date: Fri, 25 Oct 2024 15:59:45 +0200
Subject: [PATCH] Docs: Fixup unified memory tables

---
 .../memory_management/unified_memory.rst      | 22 ++++++++++++-------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/docs/how-to/hip_runtime_api/memory_management/unified_memory.rst b/docs/how-to/hip_runtime_api/memory_management/unified_memory.rst
index 4fb50839df..5cb18d6e0d 100644
--- a/docs/how-to/hip_runtime_api/memory_management/unified_memory.rst
+++ b/docs/how-to/hip_runtime_api/memory_management/unified_memory.rst
@@ -81,7 +81,7 @@ The table below lists the supported allocators for the different architectures.
 The allocators are described in the next section.
 
 .. list-table:: Supported Unified Memory Allocators
-    :widths: 40, 25, 25, 25
+    :widths: 40, 25, 25
     :header-rows: 1
     :align: center
 
@@ -167,12 +167,12 @@ functions on ROCm and CUDA, both with and without HMM support.
         - page-fault migration
       * - :cpp:func:`hipMalloc()`
         - device
-        - zero copy
+        - zero copy [zc]_
         - device
-        - zero copy
+        - zero copy [zc]_
       * - :cpp:func:`hipMallocManaged()`, ``__managed__``
         - pinned host
-        - zero copy
+        - zero copy [zc]_
         - host
         - page-fault migration
       * - :cpp:func:`hipHostRegister()`
@@ -182,9 +182,9 @@ functions on ROCm and CUDA, both with and without HMM support.
         - page-fault migration
       * - :cpp:func:`hipHostMalloc()`
         - pinned host
-        - zero copy
+        - zero copy [zc]_
         - pinned host
-        - zero copy
+        - zero copy [zc]_
 
   .. tab-item:: CUDA allocation behaviour
     :sync: cooperative-groups
@@ -220,12 +220,18 @@ functions on ROCm and CUDA, both with and without HMM support.
         - page-fault migration
       * - ``cudaMallocHost()``
         - pinned host
-        - zero copy
+        - zero copy [zc]_
         - pinned host
-        - zero copy
+        - zero copy [zc]_
 
 .. _checking unified memory support:
 
+.. [zc] Zero copy is a feature, where the memory is pinned to either the device
+        or the host, and won't be transferred when accessed by another device or
+        the host. Instead only the requested memory is transferred, without
+        making an explicit copy, like a normal memory access, hence the term
+        "zero copy".
+
 Checking unified memory support
 --------------------------------------------------------------------------------