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doc: add memory changes in release notes

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Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
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Anatoly Burakov 2018-05-25 14:41:03 +01:00 committed by Thomas Monjalon
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doc/guides/rel_notes/release_18_05.rst
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@ -41,6 +41,40 @@ New Features
Also, make sure to start the actual text at the margin.
=========================================================
* **Reworked memory subsystem.**
Memory subsystem has been reworked to support new functionality.
On Linux, support for reserving/unreserving hugepage memory at runtime was
added, so applications no longer need to pre-reserve memory at startup. Due to
reorganized internal workings of memory subsystem, any memory allocated
through ``rte_malloc()`` or ``rte_memzone_reserve()`` is no longer guaranteed
to be IOVA-contiguous.
This functionality has introduced the following changes:
* ``rte_eal_get_physmem_layout()`` was removed
* A new flag for memzone reservation (``RTE_MEMZONE_IOVA_CONTIG``) was added
to ensure reserved memory will be IOVA-contiguous, for use with device
drivers and other cases requiring such memory
* New callbacks for memory allocation/deallocation events, allowing user (or
drivers) to be notified of new memory being allocated or deallocated
* New callbacks for validating memory allocations above specified limit,
allowing user to permit or deny memory allocations
* A new command-line switch ``--legacy-mem`` to enable EAL behavior similar to
how older versions of DPDK worked (memory segments that are IOVA-contiguous,
but hugepages are reserved at startup only, and can never be released)
* A new command-line switch ``--single-file-segments`` to put all memory
segments within a segment list in a single file
* A set of convenience function calls to look up and iterate over allocated
memory segments
* ``-m`` and ``--socket-mem`` command-line arguments now carry an additional
meaning and mark pre-reserved hugepages as "unfree-able", thereby acting as
a mechanism guaranteeing minimum availability of hugepage memory to the
application
Reserving/unreserving memory at runtime is not currently supported on FreeBSD.
* **Added bucket mempool driver.**
Added bucket mempool driver which provides a way to allocate contiguous