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Reimplement pmap_release() such that it uses the page table rather than the

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pte object to locate the page table directory pages.  (This is another step
toward the elimination of the pte object.)
This commit is contained in:
alc 2003-09-20 23:54:36 +00:00
parent a2bf473742
commit 6c696bcaf2
1 changed files with 5 additions and 10 deletions
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15
sys/i386/i386/pmap.c
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@ -1363,15 +1363,9 @@ pmap_lazyfix(pmap_t pmap)
void
pmap_release(pmap_t pmap)
{
vm_object_t object;
vm_page_t m;
vm_page_t m, ptdpg[NPGPTD];
int i;
object = pmap->pm_pteobj;
KASSERT(object->ref_count == 1,
("pmap_release: pteobj reference count %d != 1",
object->ref_count));
KASSERT(pmap->pm_stats.resident_count == 0,
("pmap_release: pmap resident count %ld != 0",
pmap->pm_stats.resident_count));
@ -1381,6 +1375,9 @@ pmap_release(pmap_t pmap)
LIST_REMOVE(pmap, pm_list);
mtx_unlock_spin(&allpmaps_lock);
for (i = 0; i < NPGPTD; i++)
ptdpg[i] = PHYS_TO_VM_PAGE(pmap->pm_pdir[PTDPTDI + i]);
bzero(pmap->pm_pdir + PTDPTDI, (nkpt + NPGPTD) *
sizeof(*pmap->pm_pdir));
#ifdef SMP
@ -1391,7 +1388,7 @@ pmap_release(pmap_t pmap)
vm_page_lock_queues();
for (i = 0; i < NPGPTD; i++) {
m = TAILQ_FIRST(&object->memq);
m = ptdpg[i];
#ifdef PAE
KASSERT(VM_PAGE_TO_PHYS(m) == (pmap->pm_pdpt[i] & PG_FRAME),
("pmap_release: got wrong ptd page"));
@ -1401,8 +1398,6 @@ pmap_release(pmap_t pmap)
vm_page_busy(m);
vm_page_free_zero(m);
}
KASSERT(TAILQ_EMPTY(&object->memq),
("pmap_release: leaking page table pages"));
vm_page_unlock_queues();
}