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In general, when we map a page into the kernel's address space, we no

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longer create a pv entry for that mapping.  (The two exceptions are
mappings into the kernel's exec and pipe submaps.)  Consequently, there is
no reason for get_pv_entry() to dig deep into the free page queues, i.e.,
use VM_ALLOC_SYSTEM, by default.  This revision changes get_pv_entry() to
use VM_ALLOC_NORMAL by default, i.e., before calling pmap_collect() to
reclaim pv entries.

Approved by:	re (kensmith)
This commit is contained in:
Alan Cox 2007-08-21 04:59:34 +00:00
parent 7dd9c45f26
commit 8beae25391
2 changed files with 6 additions and 8 deletions
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7
sys/amd64/amd64/pmap.c
View File

@ -1722,7 +1722,7 @@ get_pv_entry(pmap_t pmap, int try)
static const struct timeval printinterval = { 60, 0 };
static struct timeval lastprint;
static vm_pindex_t colour;
int bit, field, page_req;
int bit, field;
pv_entry_t pv;
struct pv_chunk *pc;
vm_page_t m;
@ -1755,8 +1755,7 @@ get_pv_entry(pmap_t pmap, int try)
}
}
/* No free items, allocate another chunk */
page_req = try ? VM_ALLOC_NORMAL : VM_ALLOC_SYSTEM;
m = vm_page_alloc(NULL, colour, page_req | VM_ALLOC_NOOBJ);
m = vm_page_alloc(NULL, colour, VM_ALLOC_NORMAL | VM_ALLOC_NOOBJ);
if (m == NULL) {
if (try) {
pv_entry_count--;
@ -1775,7 +1774,7 @@ get_pv_entry(pmap_t pmap, int try)
PV_STAT(pmap_collect_inactive++);
pmap_collect(pmap, &vm_page_queues[PQ_INACTIVE]);
m = vm_page_alloc(NULL, colour,
VM_ALLOC_SYSTEM | VM_ALLOC_NOOBJ);
VM_ALLOC_NORMAL | VM_ALLOC_NOOBJ);
if (m == NULL) {
PV_STAT(pmap_collect_active++);
pmap_collect(pmap, &vm_page_queues[PQ_ACTIVE]);

7
sys/i386/i386/pmap.c
View File

@ -1795,7 +1795,7 @@ get_pv_entry(pmap_t pmap, int try)
static const struct timeval printinterval = { 60, 0 };
static struct timeval lastprint;
static vm_pindex_t colour;
int bit, field, page_req;
int bit, field;
pv_entry_t pv;
struct pv_chunk *pc;
vm_page_t m;
@ -1830,8 +1830,7 @@ get_pv_entry(pmap_t pmap, int try)
}
}
pc = (struct pv_chunk *)pmap_ptelist_alloc(&pv_vafree);
page_req = try ? VM_ALLOC_NORMAL : VM_ALLOC_SYSTEM;
m = vm_page_alloc(NULL, colour, page_req |
m = vm_page_alloc(NULL, colour, VM_ALLOC_NORMAL |
VM_ALLOC_NOOBJ | VM_ALLOC_WIRED);
if (m == NULL || pc == NULL) {
if (try) {
@ -1860,7 +1859,7 @@ get_pv_entry(pmap_t pmap, int try)
PV_STAT(pmap_collect_inactive++);
pmap_collect(pmap, &vm_page_queues[PQ_INACTIVE]);
if (m == NULL)
m = vm_page_alloc(NULL, colour, VM_ALLOC_SYSTEM |
m = vm_page_alloc(NULL, colour, VM_ALLOC_NORMAL |
VM_ALLOC_NOOBJ | VM_ALLOC_WIRED);
if (pc == NULL)
pc = (struct pv_chunk *)pmap_ptelist_alloc(&pv_vafree);