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Add support for automatic promotion of 4KB page mappings to 2MB page

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mappings.  Automatic promotion can be enabled by setting the tunable
"vm.pmap.pg_ps_enabled" to a non-zero value.  By default, automatic
promotion is disabled.  (Expect this to change.)

Reviewed by:	ups
Tested by:	kris, Peter Holm
This commit is contained in:
Alan Cox 2008-03-04 18:50:15 +00:00
parent cfea3f8522
commit 0116b8b321
2 changed files with 1080 additions and 104 deletions
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1172
sys/amd64/amd64/pmap.c
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12
sys/amd64/include/pmap.h
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@ -57,7 +57,7 @@
#define PG_NC_PCD 0x010 /* PCD Cache disable */
#define PG_A 0x020 /* A Accessed */
#define PG_M 0x040 /* D Dirty */
#define PG_PS 0x080 /* PS Page size (0=4k,1=4M) */
#define PG_PS 0x080 /* PS Page size (0=4k,1=2M) */
#define PG_PTE_PAT 0x080 /* PAT PAT index */
#define PG_G 0x100 /* G Global */
#define PG_AVAIL1 0x200 /* / Available for system */
@ -75,6 +75,13 @@
#define PG_PROT (PG_RW|PG_U) /* all protection bits . */
#define PG_N (PG_NC_PWT|PG_NC_PCD) /* Non-cacheable */
/*
* Promotion to a 2MB (PDE) page mapping requires that the corresponding 4KB
* (PTE) page mappings have identical settings for the following fields:
*/
#define PG_PTE_PROMOTE (PG_NX | PG_MANAGED | PG_W | PG_G | PG_PTE_PAT | \
PG_M | PG_A | PG_NC_PCD | PG_NC_PWT | PG_U | PG_RW | PG_V)
/*
* Page Protection Exception bits
*/
@ -241,6 +248,7 @@ struct pmap {
u_int pm_active; /* active on cpus */
/* spare u_int here due to padding */
struct pmap_statistics pm_stats; /* pmap statistics */
vm_page_t pm_root; /* spare page table pages */
};
typedef struct pmap *pmap_t;
@ -301,7 +309,6 @@ extern vm_paddr_t dump_avail[];
extern vm_offset_t virtual_avail;
extern vm_offset_t virtual_end;
#define pmap_page_is_mapped(m) (!TAILQ_EMPTY(&(m)->md.pv_list))
#define pmap_unmapbios(va, sz) pmap_unmapdev((va), (sz))
void pmap_bootstrap(vm_paddr_t *);
@ -315,6 +322,7 @@ void pmap_kremove(vm_offset_t);
void *pmap_mapbios(vm_paddr_t, vm_size_t);
void *pmap_mapdev(vm_paddr_t, vm_size_t);
void *pmap_mapdev_attr(vm_paddr_t, vm_size_t, int);
boolean_t pmap_page_is_mapped(vm_page_t m);
void pmap_unmapdev(vm_offset_t, vm_size_t);
void pmap_invalidate_page(pmap_t, vm_offset_t);
void pmap_invalidate_range(pmap_t, vm_offset_t, vm_offset_t);