Change Details

The output from sysctl vm.pmap.kernel_maps should include: 1. 64KB mappings on the kernel ``` 0xffff000000000000-0xffff0000013bc000 rwx-sg WB 0 9 27 12 ``` 2. 64KB and/or 2MB mappings on devices ``` 0xffff0000f8800000-0xffff0001085f4000 rw--sg DEV 0 126 31 4 ``` or ``` 0xffff000108800000-0xffff000109800000 rw--sg DEV-NP 0 8 0 0 ``` (More devices will use 64KB mappings once kern/subr_devmap.c is changed to allocate aligned virtual addresses.) After a "buildworld" the output from sysctl vm.pmap should include non-zero counts for L2 fills and L3C demotions and fills: ``` vm.pmap.l3c.copies: 0 vm.pmap.l3c.protects: 0 vm.pmap.l3c.removes: 554 vm.pmap.l3c.mappings: 0 vm.pmap.l3c.demotions: 45859 vm.pmap.l2.fills: 2549 ``` When an L2 demotion has to refill the L3 page table page, it sets ATTR_CONTIGUOUS on the L3 mappings, creating some user-space mappings with ATTR_CONTIGUOUS.

The output from sysctl vm.pmap.kernel_maps should include: 1. 64KB mappings on the kernel ``` 0xffff000000000000-0xffff0000013bc000 rwx-sg WB 0 9 27 12 ``` 2. 64KB and/or 2MB mappings on devices ``` 0xffff0000f8800000-0xffff0001085f4000 rw--sg DEV 0 126 31 4 ``` or ``` 0xffff000108800000-0xffff000109800000 rw--sg DEV-NP 0 8 0 0 ``` (More devices will use 64KB mappings once kern/subr_devmap.c is changed to allocate aligned virtual addresses.) After a "buildworld" the output from sysctl vm.pmap should include non-zero counts for L2 fills and L3C demotions and removes: ``` vm.pmap.l3c.copies: 0 vm.pmap.l3c.protects: 0 vm.pmap.l3c.removes: 554 vm.pmap.l3c.mappings: 0 vm.pmap.l3c.demotions: 45859 vm.pmap.l2.fills: 2549 ``` When an L2 demotion has to refill the L3 page table page, it sets ATTR_CONTIGUOUS on the L3 mappings, creating some user-space mappings with ATTR_CONTIGUOUS.

The output from sysctl vm.pmap.kernel_maps should include: 1. 64KB mappings on the kernel ``` 0xffff000000000000-0xffff0000013bc000 rwx-sg WB 0 9 27 12 ``` 2. 64KB and/or 2MB mappings on devices ``` 0xffff0000f8800000-0xffff0001085f4000 rw--sg DEV 0 126 31 4 ``` or ``` 0xffff000108800000-0xffff000109800000 rw--sg DEV-NP 0 8 0 0 ``` (More devices will use 64KB mappings once kern/subr_devmap.c is changed to allocate aligned virtual addresses.) After a "buildworld" the output from sysctl vm.pmap should include non-zero counts for L2 fills and L3C demotions and fills:removes: ``` vm.pmap.l3c.copies: 0 vm.pmap.l3c.protects: 0 vm.pmap.l3c.removes: 554 vm.pmap.l3c.mappings: 0 vm.pmap.l3c.demotions: 45859 vm.pmap.l2.fills: 2549 ``` When an L2 demotion has to refill the L3 page table page, it sets ATTR_CONTIGUOUS on the L3 mappings, creating some user-space mappings with ATTR_CONTIGUOUS.