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Defer the acquisition of the page and page queues locks in

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vm_pageout_object_deactivate_pages().
This commit is contained in:
Alan Cox 2010-05-02 20:46:17 +00:00
parent f623e55269
commit 447fe2a4c6
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=207540
1 changed files with 8 additions and 8 deletions
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16
sys/vm/vm_pageout.c
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@ -540,6 +540,7 @@ vm_pageout_object_deactivate_pages(pmap, first_object, desired)
for (object = first_object;; object = backing_object) {
if (pmap_resident_count(pmap) <= desired)
goto unlock_return;
VM_OBJECT_LOCK_ASSERT(object, MA_OWNED);
if (object->type == OBJT_PHYS || object->paging_in_progress)
goto unlock_return;
@ -551,19 +552,18 @@ vm_pageout_object_deactivate_pages(pmap, first_object, desired)
*/
p = TAILQ_FIRST(&object->memq);
while (p != NULL) {
if (pmap_resident_count(pmap) <= desired)
goto unlock_return;
next = TAILQ_NEXT(p, listq);
if ((p->oflags & VPO_BUSY) != 0 || p->busy != 0) {
p = next;
continue;
}
vm_page_lock(p);
vm_page_lock_queues();
if (pmap_resident_count(pmap) <= desired) {
vm_page_unlock_queues();
vm_page_unlock(p);
goto unlock_return;
}
next = TAILQ_NEXT(p, listq);
cnt.v_pdpages++;
if (p->wire_count != 0 ||
p->hold_count != 0 ||
p->busy != 0 ||
(p->oflags & VPO_BUSY) ||
!pmap_page_exists_quick(pmap, p)) {
vm_page_unlock_queues();
vm_page_unlock(p);