Bring release notes up to date.

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mps/manual/source/pool/amc.rst

@@ -128,8 +128,10 @@ AMC interface
       pointers` keep objects alive.
 
     * :c:macro:`MPS_KEY_EXTEND_BY` (type :c:type:`size_t`,
-      default 4096) is the default :term:`size` of block that the pool
-      will request from the :term:`arena`.
+      default 4096) is the minimum :term:`size` of the memory segments
+      that the pool requests from the :term:`arena`. Larger segments
+      reduce the per-segment overhead, but increase
+      :term:`fragmentation` and :term:`retention`.
 
     For example::
 

mps/manual/source/release.rst

@@ -9,6 +9,15 @@ Release notes
 Release 1.115.0
 ---------------
 
+New features
+............
+
+#. When creating an :ref:`pool-amc` pool, :c:func:`mps_pool_create_k`
+   accepts the new keyword argument :c:macro:`MPS_KEY_EXTEND_BY`,
+   specifying the minimum size of the memory segments that the pool
+   requests from the :term:`arena`.
+
+
 Interface changes
 .................
 
@@ -32,6 +41,30 @@ Other changes
 
    .. _job001887: https://www.ravenbrook.com/project/mps/issue/job001887/
 
+#. :ref:`pool-amc` pools now assert that exact references into the
+   pool are aligned to the pool's alignment. See job002175_.
+
+   .. _job002175: https://www.ravenbrook.com/project/mps/issue/job002175/
+
+#. Internal calculation of the address space available to the MPS no
+   longer takes time proportional to the number of times the arena has
+   been extended, speeding up allocation when memory is tight. See
+   job003814_.
+
+   .. _job003814: https://www.ravenbrook.com/project/mps/issue/job003814/
+
+#. Setting :c:macro:`MPS_KEY_SPARE` for a :ref:`pool-mvff` pool now
+   works. See job003870_.
+   
+   .. _job003870: https://www.ravenbrook.com/project/mps/issue/job003870/
+
+#. When the arena is out of memory and cannot be extended without
+   hitting the :term:`commit limit`, the MPS now returns
+   :c:macro:`MPS_RES_COMMIT_LIMIT` rather than substituting
+   :c:macro:`MPS_RES_RESOURCE`. See job003899_.
+   
+   .. _job003899: https://www.ravenbrook.com/project/mps/issue/job003899/
+
 
 .. _release-notes-1.114:
 
@@ -163,8 +196,8 @@ Other changes
 
 #. Allocation into :ref:`pool-awl` pools again reliably provokes
    garbage collections of the generation that the pool belongs to. (In
-   release 1.113.0, the generation would only be collected if a pool
-   of some other class allocated into it.) See job003772_.
+   version 1.113, the generation would only be collected if a pool of
+   some other class allocated into it.) See job003772_.
 
    .. _job003772: https://www.ravenbrook.com/project/mps/issue/job003772/
 
@@ -176,13 +209,21 @@ Other changes
    .. _job003773: https://www.ravenbrook.com/project/mps/issue/job003773/
 
 #. The :ref:`pool-mvt` and :ref:`pool-mvff` pool classes are now
-   around 25% faster (in our benchmarks) than they were in release
-   1.113.0.
+   around 25% faster (in our benchmarks) than they were in version
+   1.113.
 
 #. The default assertion handler in the default :term:`plinth` now
    flushes the telemetry stream before aborting. See
    :c:func:`mps_lib_assert_fail`.
 
+#. Garbage collection performance is substantially improved in the
+   situation where the arena has been extended many time. Critical
+   operations now take time logarithmic in the number of times the
+   arena has been extended (rather than linear, as in version 1.113
+   and earlier). See job003554_.
+
+   .. _job003554: https://www.ravenbrook.com/project/mps/issue/job003554/
+
 
 .. _release-notes-1.113: