feat: add support for hugepages

[piyush-jena]

Description of changes:

• Add API models to support hugepages and transparent hugepages

Testing

bash-5.2# cat /proc/meminfo | grep ^Huge
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
Hugetlb:               0 kB
bash-5.2# cat /sys/kernel/mm//transparent_hugepage/enabled
always [madvise] never
bash-5.2# cat /sys/kernel/mm//transparent_hugepage/defrag
always defer defer+madvise [madvise] never
bash-5.2# apiclient apply <<EOF
> [settings.kernel.hugepages.static]
> essential = true
> [settings.kernel.hugepages.static."2Mi"]
> count = "200"
> [settings.kernel.hugepages.static."1Gi"]
> count = "0:1,1:2"
> [settings.kernel.hugepages.transparent]
> enabled = "always"
> EOF

After reboot:

[root@admin]# sheltie
bash-5.2# cat /proc/meminfo | grep ^Huge
HugePages_Total:     200
HugePages_Free:      200
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
Hugetlb:         3555328 kB
bash-5.2# cat /sys/kernel/mm/transparent_hugepage/enabled
[always] madvise never
bash-5.2# cat /sys/kernel/mm/transparent_hugepage/defrag
always defer [defer+madvise] madvise never
bash-5.2# cat /sys/devices/system/node/node0/hugepages/hugepages-1048576kB/nr_hugepages
1
bash-5.2# cat /sys/devices/system/node/node1/hugepages/hugepages-1048576kB/nr_hugepages
2

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