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Fix NKPT comments to match reality. Note that the current value

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of NKPT is no longer enough to run amd64 with 16G of RAM, as it
doesn't have space for mapping a kernel (16M kernel would require
additionally 8 page tables).
This commit is contained in:
Ruslan Ermilov 2006-11-13 20:33:54 +00:00
parent bfc5793f96
commit d77f5882e7
2 changed files with 9 additions and 5 deletions
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5
sys/amd64/include/pmap.h
View File

@ -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 */

9
sys/i386/include/pmap.h
View File

@ -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 */