[OLK-6.6] 支持内存可靠性分级特性

Introduction

============

Memory reliable feature is a memory tiering mechanism. It is based on
kernel mirror feature, which splits memory into two separate regions,
mirrored(reliable) region and non-mirrored (non-reliable) region.

for kernel mirror feature:

- allocate kernel memory from mirrored region by default
- allocate user memory from non-mirrored region by default

non-mirrored region will be arranged into ZONE_MOVABLE.

for kernel reliable feature, it has additional features below:

- normal user tasks never alloc memory from mirrored region with userspace
  apis(malloc, mmap, etc.)
- special user tasks will allocate memory from mirrored region by default
- shmem/pagecache allocate memory from mirrored region by default
- upper limit of mirrored region allcated for user tasks, shmem and
  page cache

Support Reliable fallback mechanism which allows special user tasks, shmem
and page cache can fallback to alloc non-mirrored region, it's the default
setting.

In order to fulfil the goal

- ___GFP_RELIABLE flag added for alloc memory from mirrored region.

- the high_zoneidx for special user tasks/shmem/pagecache is set to
  ZONE_NORMAL.

- normal user tasks could only alloc from ZONE_MOVABLE.

GVP openEuler / kernel
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