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- Significantly reduce the number of preallocated pv entries in

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pmap_init().  Such a large preallocation is unnecessary and wastes
   nearly eight megabytes of kernel virtual address space per gigabyte
   of managed physical memory.
 - Increase UMA_BOOT_PAGES by two.  This enables the removal of
   pmap_pv_allocf().  (Note: this function was only used during
   initialization, specifically, after pmap_init() but before
   pmap_init2().  During pmap_init2(), a new allocator is installed.)
This commit is contained in:
Alan Cox 2003-12-22 01:01:32 +00:00
parent 0fa02ea5f7
commit 925692caa5
3 changed files with 3 additions and 29 deletions
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15
sys/amd64/amd64/pmap.c
View File

@ -227,7 +227,6 @@ static vm_page_t pmap_allocpte(pmap_t pmap, vm_offset_t va);
static vm_page_t _pmap_allocpte(pmap_t pmap, vm_pindex_t ptepindex);
static int pmap_unuse_pt(pmap_t, vm_offset_t, vm_page_t);
static vm_offset_t pmap_kmem_choose(vm_offset_t addr);
static void *pmap_pv_allocf(uma_zone_t zone, int bytes, u_int8_t *flags, int wait);
CTASSERT(1 << PDESHIFT == sizeof(pd_entry_t));
CTASSERT(1 << PTESHIFT == sizeof(pt_entry_t));
@ -526,13 +525,6 @@ pmap_bootstrap(firstaddr)
invltlb();
}
static void *
pmap_pv_allocf(uma_zone_t zone, int bytes, u_int8_t *flags, int wait)
{
*flags = UMA_SLAB_PRIV;
return (void *)kmem_alloc(kernel_map, bytes);
}
/*
* Initialize the pmap module.
* Called by vm_init, to initialize any structures that the pmap
@ -545,7 +537,6 @@ pmap_init(phys_start, phys_end)
vm_paddr_t phys_start, phys_end;
{
int i;
int initial_pvs;
/*
* Allocate memory for random pmap data structures. Includes the
@ -563,13 +554,9 @@ pmap_init(phys_start, phys_end)
/*
* init the pv free list
*/
initial_pvs = vm_page_array_size;
if (initial_pvs < MINPV)
initial_pvs = MINPV;
pvzone = uma_zcreate("PV ENTRY", sizeof (struct pv_entry), NULL, NULL,
NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_VM | UMA_ZONE_NOFREE);
uma_zone_set_allocf(pvzone, pmap_pv_allocf);
uma_prealloc(pvzone, initial_pvs);
uma_prealloc(pvzone, MINPV);
/*
* Now it is safe to enable pv_table recording.

15
sys/i386/i386/pmap.c
View File

@ -245,7 +245,6 @@ static vm_page_t _pmap_allocpte(pmap_t pmap, unsigned ptepindex);
static pt_entry_t *pmap_pte_quick(pmap_t pmap, vm_offset_t va);
static int pmap_unuse_pt(pmap_t, vm_offset_t, vm_page_t);
static vm_offset_t pmap_kmem_choose(vm_offset_t addr);
static void *pmap_pv_allocf(uma_zone_t zone, int bytes, u_int8_t *flags, int wait);
#ifdef PAE
static void *pmap_pdpt_allocf(uma_zone_t zone, int bytes, u_int8_t *flags, int wait);
#endif
@ -418,13 +417,6 @@ pmap_set_pg(void)
}
}
static void *
pmap_pv_allocf(uma_zone_t zone, int bytes, u_int8_t *flags, int wait)
{
*flags = UMA_SLAB_PRIV;
return (void *)kmem_alloc(kernel_map, bytes);
}
#ifdef PAE
static void *
pmap_pdpt_allocf(uma_zone_t zone, int bytes, u_int8_t *flags, int wait)
@ -446,7 +438,6 @@ pmap_init(phys_start, phys_end)
vm_paddr_t phys_start, phys_end;
{
int i;
int initial_pvs;
/*
* Allocate memory for random pmap data structures. Includes the
@ -464,13 +455,9 @@ pmap_init(phys_start, phys_end)
/*
* init the pv free list
*/
initial_pvs = vm_page_array_size;
if (initial_pvs < MINPV)
initial_pvs = MINPV;
pvzone = uma_zcreate("PV ENTRY", sizeof (struct pv_entry), NULL, NULL,
NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_VM | UMA_ZONE_NOFREE);
uma_zone_set_allocf(pvzone, pmap_pv_allocf);
uma_prealloc(pvzone, initial_pvs);
uma_prealloc(pvzone, MINPV);
#ifdef PAE
pdptzone = uma_zcreate("PDPT", NPGPTD * sizeof(pdpt_entry_t), NULL,

2
sys/vm/uma_int.h
View File

@ -103,7 +103,7 @@
#define UMA_SLAB_MASK (PAGE_SIZE - 1) /* Mask to get back to the page */
#define UMA_SLAB_SHIFT PAGE_SHIFT /* Number of bits PAGE_MASK */
#define UMA_BOOT_PAGES 30 /* Pages allocated for startup */
#define UMA_BOOT_PAGES 32 /* Pages allocated for startup */
/* Max waste before going to off page slab management */
#define UMA_MAX_WASTE (UMA_SLAB_SIZE / 10)