d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

vm_page_select_cache() enforces a number of conditions on the returned

Browse Source 
page.  Add the ability to lock the containing object to those conditions.
This commit is contained in:
Alan Cox 2003-06-26 15:44:03 +00:00
parent 52eec71b80
commit 9f2b1758c3
1 changed files with 6 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
sys/vm/vm_page.c
View File

@ -719,7 +719,8 @@ vm_page_select_cache(vm_pindex_t color)
while (TRUE) {
m = vm_pageq_find(PQ_CACHE, color & PQ_L2_MASK, FALSE);
if (m && ((m->flags & (PG_BUSY|PG_UNMANAGED)) || m->busy ||
m->hold_count || m->wire_count)) {
m->hold_count || m->wire_count ||
!VM_OBJECT_TRYLOCK(m->object))) {
vm_page_deactivate(m);
continue;
}
@ -765,6 +766,7 @@ vm_page_select_free(vm_pindex_t color, boolean_t prefer_zero)
vm_page_t
vm_page_alloc(vm_object_t object, vm_pindex_t pindex, int req)
{
vm_object_t m_object;
vm_page_t m = NULL;
vm_pindex_t color;
int flags, page_req, s;
@ -820,10 +822,13 @@ vm_page_alloc(vm_object_t object, vm_pindex_t pindex, int req)
return (NULL);
}
KASSERT(m->dirty == 0, ("Found dirty cache page %p", m));
m_object = m->object;
VM_OBJECT_LOCK_ASSERT(m_object, MA_OWNED);
vm_page_busy(m);
pmap_remove_all(m);
vm_page_free(m);
vm_page_unlock_queues();
VM_OBJECT_UNLOCK(m_object);
goto loop;
} else {
/*