[0/8] introduce memarea library

  The memarea library is an allocator of variable-size object. It is a
collection of allocated objects that can be efficiently alloc or free
all at once, the main feature are as follows:
a) it facilitate alloc and free of memory with low overhead.

b) it provides refcnt feature which could be useful in some scenes.

c) it supports MT-safe as long as it's specified at creation time.

d) it's memory source could comes from:
d.1) system API: malloc in C library.
d.2) user provided address: it can be from the rte_malloc API series
or extended memory as long as it is available.
d.3) user provided memarea: it can be from another memarea.

e) it provides backup memory mechanism, the memarea object could use
another memarea object as a backup.

Note:
a) the memarea is oriented towards the application layer, which could
provides 'region-based memory management' [1] function.
b) the eal library also provide memory zone/heap management, but these
are tied to huge pages management.

[1] https://en.wikipedia.org/wiki/Region-based_memory_management

Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>

Chengwen Feng (8):
  memarea: introduce memory area library
  test/memarea: support memarea test
  memarea: support alloc/free/update-refcnt API
  test/memarea: support alloc/free/update-refcnt test
  memarea: support dump API
  test/memarea: support dump test
  memarea: support backup memory mechanism
  test/memarea: support backup memory test

 MAINTAINERS                            |   6 +
 app/test/meson.build                   |   2 +
 app/test/test_memarea.c                | 340 ++++++++++++++++++++++
 doc/api/doxy-api-index.md              |   3 +-
 doc/api/doxy-api.conf.in               |   1 +
 doc/guides/prog_guide/index.rst        |   1 +
 doc/guides/prog_guide/memarea_lib.rst  |  57 ++++
 doc/guides/rel_notes/release_22_11.rst |   6 +
 lib/eal/include/rte_log.h              |   1 +
 lib/memarea/memarea_private.h          |  35 +++
 lib/memarea/meson.build                |  16 +
 lib/memarea/rte_memarea.c              | 385 +++++++++++++++++++++++++
 lib/memarea/rte_memarea.h              | 214 ++++++++++++++
 lib/memarea/version.map                |  16 +
 lib/meson.build                        |   1 +
 15 files changed, 1083 insertions(+), 1 deletion(-)
 create mode 100644 app/test/test_memarea.c
 create mode 100644 doc/guides/prog_guide/memarea_lib.rst
 create mode 100644 lib/memarea/memarea_private.h
 create mode 100644 lib/memarea/meson.build
 create mode 100644 lib/memarea/rte_memarea.c
 create mode 100644 lib/memarea/rte_memarea.h
 create mode 100644 lib/memarea/version.map