diff options
| -rw-r--r-- | sys/amd64/include/pmap.h | 5 | ||||
| -rw-r--r-- | sys/i386/include/pmap.h | 9 |
2 files changed, 9 insertions, 5 deletions
diff --git a/sys/amd64/include/pmap.h b/sys/amd64/include/pmap.h index 22ec67c..df89589 100644 --- a/sys/amd64/include/pmap.h +++ b/sys/amd64/include/pmap.h @@ -101,9 +101,10 @@ ((unsigned long)(l2) << PDRSHIFT) | \ ((unsigned long)(l1) << PAGE_SHIFT)) -/* Initial number of kernel page tables */ +/* Initial number of kernel page tables. */ #ifndef NKPT -#define NKPT 240 /* Enough for 16GB (2MB page tables) */ +/* 240 page tables needed to map 16G (120B "struct vm_page", 2M page tables). */ +#define NKPT 240 #endif #define NKPML4E 1 /* number of kernel PML4 slots */ diff --git a/sys/i386/include/pmap.h b/sys/i386/include/pmap.h index 6e757a6..996795f 100644 --- a/sys/i386/include/pmap.h +++ b/sys/i386/include/pmap.h @@ -98,14 +98,17 @@ */ #define VADDR(pdi, pti) ((vm_offset_t)(((pdi)<<PDRSHIFT)|((pti)<<PAGE_SHIFT))) -/* Actual number of kernel page tables */ +/* Initial number of kernel page tables. */ #ifndef NKPT #ifdef PAE -#define NKPT 240 /* Enough for 16GB (2MB page tables) */ +/* 152 page tables needed to map 16G (76B "struct vm_page", 2M page tables). */ +#define NKPT 240 #else -#define NKPT 30 /* Enough for 4GB (4MB page tables) */ +/* 18 page tables needed to map 4G (72B "struct vm_page", 4M page tables). */ +#define NKPT 30 #endif #endif + #ifndef NKPDE #ifdef SMP #define NKPDE (KVA_PAGES - 1) /* number of page tables/pde's */ |
