1. What are Pageblocks and migrate types(MIGRATE_CMA) in Linux memory ?
How many movable/unmovable pages are defined by default?
With 2GB of memory, how many movable and unmovable pages are defined by default ?
Example - cat /proc/pagetypeinfo :- Kernel Version - 4.14 CPU Architecture - ARM 32-bit
Page block order: 12
Pages per block: 4096
Free pages count per migrate type at order 0 1 2 3 4 5 6 7 8 9 10 11 12
Node 0, zone DMA, type Unmovable 71 235 137 30 17 7 2 0 0 1 1 0 0
Node 0, zone DMA, type Movable 0 1 1 0 1 0 0 1 0 1 0 3 9
Node 0, zone DMA, type Reclaimable 0 0 1 2 0 0 0 0 1 1 1 1 0
Node 0, zone DMA, type HighAtomic 0 0 0 0 0 0 0 0 0 0 0 0 0
Node 0, zone DMA, type CMA 0 0 0 0 0 0 0 0 0 0 0 0 0
Node 0, zone DMA, type Isolate 0 0 0 0 0 0 0 0 0 0 0 0 0
Node 0, zone HighMem, type Unmovable 55 47 16 8 6 2 1 0 0 0 0 1 0
Node 0, zone HighMem, type Movable 0 0 0 0 0 0 0 0 0 0 0 0 0
Node 0, zone HighMem, type Reclaimable 0 0 0 0 0 0 0 0 0 0 0 0 0
Node 0, zone HighMem, type HighAtomic 0 0 0 0 0 0 0 0 0 0 0 0 0
Node 0, zone HighMem, type CMA 261 915 778 204 48 20 5 0 0 0 0 1 13
Node 0, zone HighMem, type Isolate 0 0 0 0 0 0 0 0 0 0 0 0 0
Number of blocks type Unmovable Movable Reclaimable HighAtomic CMA Isolate
Node 0, zone DMA 10 14 4 0 0 0
Node 0, zone HighMem 3 32 0 0 57 0
Regards,
Pankaj
