这个文件是将buddyinfo的内容进一步细分：
Free pages count per migrate type at order -- 不同order 按照migrate type的空闲page数量
Number of blocks -- 连续内存块数量
root:/ # cat /proc/pagetypeinfo
Page block order: 10
Pages per block: 1024
Free pages count per migrate type at order 0 1 2 3 4 5 6 7 8 9 10
Node 0, zone DMA, type Unmovable 248 78 126 95 5 4 1 1 18 32 59
Node 0, zone DMA, type Reclaimable 0 1 3 3 1 1 0 0 1 1 0
Node 0, zone DMA, type Movable 696 385 201 44 22 13 1 2 1 3 214
Node 0, zone DMA, type CMA 0 0 0 0 0 0 0 0 0 0 0
Node 0, zone DMA, type Reserve 0 0 0 0 0 0 0 0 0 0 2
Node 0, zone DMA, type Isolate 0 0 0 0 0 0 0 0 0 0 0
Node 0, zone Normal, type Unmovable 1 71 125 131 7 5 0 1 10 28 60
Node 0, zone Normal, type Reclaimable 0 0 0 0 1 1 0 1 1 0 0
Node 0, zone Normal, type Movable 128 383 121 52 11 5 0 3 2 1 221
Node 0, zone Normal, type CMA 0 0 0 0 0 0 0 0 0 0 0
Node 0, zone Normal, type Reserve 0 0 0 0 0 0 0 0 0 0 2
Node 0, zone Normal, type Isolate 0 0 0 0 0 0 0 0 0 0 0
Number of blocks type Unmovable Reclaimable Movable CMA Reserve Isolate
Node 0, zone DMA 142 8 531 36 2 0
Node 0, zone Normal 139 10 608 0 2 0
Number of mixed blocks Unmovable Reclaimable Movable CMA Reserve Isolate
Node 0, zone DMA 0 0 0 36 0 0
Node 0, zone Normal 0 0 0 0 0 0