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Additional pmap locking

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This commit is contained in:
Alan Cox 2004-07-14 05:49:44 +00:00
parent 66ea137d89
commit 4b6df2ead7
1 changed files with 49 additions and 28 deletions
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77
sys/alpha/alpha/pmap.c
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@ -745,11 +745,18 @@ pmap_track_modified(vm_offset_t va)
vm_paddr_t
pmap_extract(pmap_t pmap, vm_offset_t va)
{
pt_entry_t* pte = pmap_lev3pte(pmap, va);
if (pte)
return alpha_ptob(ALPHA_PTE_TO_PFN(*pte));
else
return 0;
pt_entry_t *pte;
vm_paddr_t pa;
pa = 0;
if (pmap == NULL)
return (pa);
PMAP_LOCK(pmap);
pte = pmap_lev3pte(pmap, va);
if (pte != NULL)
pa = alpha_ptob(ALPHA_PTE_TO_PFN(*pte));
PMAP_UNLOCK(pmap);
return (pa);
}
/*
@ -1529,6 +1536,7 @@ pmap_remove_page(pmap_t pmap, vm_offset_t va)
{
register pt_entry_t *ptq;
PMAP_LOCK_ASSERT(pmap, MA_OWNED);
ptq = pmap_lev3pte(pmap, va);
/*
@ -1560,8 +1568,12 @@ pmap_remove(pmap_t pmap, vm_offset_t sva, vm_offset_t eva)
if (pmap == NULL)
return;
/*
* Perform an unsynchronized read. This is, however, safe.
*/
if (pmap->pm_stats.resident_count == 0)
return;
PMAP_LOCK(pmap);
/*
* special handling of removing one page. a very
@ -1570,7 +1582,7 @@ pmap_remove(pmap_t pmap, vm_offset_t sva, vm_offset_t eva)
*/
if (sva + PAGE_SIZE == eva) {
pmap_remove_page(pmap, sva);
return;
goto out;
}
for (va = sva; va < eva; va = nva) {
@ -1587,6 +1599,8 @@ pmap_remove(pmap_t pmap, vm_offset_t sva, vm_offset_t eva)
pmap_remove_page(pmap, va);
nva = va + PAGE_SIZE;
}
out:
PMAP_UNLOCK(pmap);
}
/*
@ -2381,21 +2395,25 @@ pmap_is_modified(vm_page_t m)
{
pv_entry_t pv;
pt_entry_t *pte;
boolean_t rv;
rv = FALSE;
if (!pmap_initialized || (m->flags & PG_FICTITIOUS))
return FALSE;
return (rv);
/*
* A page is modified if any mapping has had its PG_FOW flag
* cleared.
*/
TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) {
PMAP_LOCK(pv->pv_pmap);
pte = pmap_lev3pte(pv->pv_pmap, pv->pv_va);
if (!(*pte & PG_FOW))
return 1;
rv = !(*pte & PG_FOW);
PMAP_UNLOCK(pv->pv_pmap);
if (rv)
break;
}
return 0;
return (rv);
}
/*
@ -2408,14 +2426,17 @@ boolean_t
pmap_is_prefaultable(pmap_t pmap, vm_offset_t addr)
{
pt_entry_t *pte;
boolean_t rv;
if (!pmap_pte_v(pmap_lev1pte(pmap, addr)) ||
!pmap_pte_v(pmap_lev2pte(pmap, addr)))
return (FALSE);
pte = vtopte(addr);
if (*pte)
return (FALSE);
return (TRUE);
rv = FALSE;
PMAP_LOCK(pmap);
if (pmap_pte_v(pmap_lev1pte(pmap, addr)) &&
pmap_pte_v(pmap_lev2pte(pmap, addr))) {
pte = vtopte(addr);
rv = *pte == 0;
}
PMAP_UNLOCK(pmap);
return (rv);
}
/*
@ -2614,30 +2635,30 @@ pmap_mincore(pmap, addr)
pmap_t pmap;
vm_offset_t addr;
{
pt_entry_t *pte;
pt_entry_t *ptep, pte;
int val = 0;
pte = pmap_lev3pte(pmap, addr);
if (pte == 0) {
return 0;
}
PMAP_LOCK(pmap);
ptep = pmap_lev3pte(pmap, addr);
pte = (ptep != NULL) ? *ptep : 0;
PMAP_UNLOCK(pmap);
if (pmap_pte_v(pte)) {
if (pte & PG_V) {
vm_page_t m;
vm_offset_t pa;
val = MINCORE_INCORE;
if ((*pte & PG_MANAGED) == 0)
if ((pte & PG_MANAGED) == 0)
return val;
pa = pmap_pte_pa(pte);
pa = alpha_ptob(ALPHA_PTE_TO_PFN(pte));
m = PHYS_TO_VM_PAGE(pa);
/*
* Modified by us
*/
if ((*pte & PG_FOW) == 0)
if ((pte & PG_FOW) == 0)
val |= MINCORE_MODIFIED|MINCORE_MODIFIED_OTHER;
else {
/*
@ -2651,7 +2672,7 @@ pmap_mincore(pmap, addr)
/*
* Referenced by us
*/
if ((*pte & (PG_FOR | PG_FOE)) == 0)
if ((pte & (PG_FOR | PG_FOE)) == 0)
val |= MINCORE_REFERENCED|MINCORE_REFERENCED_OTHER;
else {
/*