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Defer freeing any page table pages in pmap_remove_all() until after the

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page queues lock is released.  This may reduce the amount of time that the
page queues lock is held by pmap_remove_all().
This commit is contained in:
alc 2010-05-28 06:49:57 +00:00
parent 5260c24925
commit f89998ed71
2 changed files with 4 additions and 4 deletions
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4
sys/amd64/amd64/pmap.c
View File

@ -2796,6 +2796,7 @@ pmap_remove_all(vm_page_t m)
KASSERT((m->flags & PG_FICTITIOUS) == 0,
("pmap_remove_all: page %p is fictitious", m));
free = NULL;
vm_page_lock_queues();
pvh = pa_to_pvh(VM_PAGE_TO_PHYS(m));
while ((pv = TAILQ_FIRST(&pvh->pv_list)) != NULL) {
@ -2825,16 +2826,15 @@ pmap_remove_all(vm_page_t m)
*/
if ((tpte & (PG_M | PG_RW)) == (PG_M | PG_RW))
vm_page_dirty(m);
free = NULL;
pmap_unuse_pt(pmap, pv->pv_va, *pde, &free);
pmap_invalidate_page(pmap, pv->pv_va);
pmap_free_zero_pages(free);
TAILQ_REMOVE(&m->md.pv_list, pv, pv_list);
free_pv_entry(pmap, pv);
PMAP_UNLOCK(pmap);
}
vm_page_flag_clear(m, PG_WRITEABLE);
vm_page_unlock_queues();
pmap_free_zero_pages(free);
}
/*

4
sys/i386/i386/pmap.c
View File

@ -2900,6 +2900,7 @@ pmap_remove_all(vm_page_t m)
KASSERT((m->flags & PG_FICTITIOUS) == 0,
("pmap_remove_all: page %p is fictitious", m));
free = NULL;
vm_page_lock_queues();
sched_pin();
pvh = pa_to_pvh(VM_PAGE_TO_PHYS(m));
@ -2930,10 +2931,8 @@ pmap_remove_all(vm_page_t m)
*/
if ((tpte & (PG_M | PG_RW)) == (PG_M | PG_RW))
vm_page_dirty(m);
free = NULL;
pmap_unuse_pt(pmap, pv->pv_va, &free);
pmap_invalidate_page(pmap, pv->pv_va);
pmap_free_zero_pages(free);
TAILQ_REMOVE(&m->md.pv_list, pv, pv_list);
free_pv_entry(pmap, pv);
PMAP_UNLOCK(pmap);
@ -2941,6 +2940,7 @@ pmap_remove_all(vm_page_t m)
vm_page_flag_clear(m, PG_WRITEABLE);
sched_unpin();
vm_page_unlock_queues();
pmap_free_zero_pages(free);
}
/*