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- In vm_page_insert() hold the backing vnode when the first page

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is inserted.
 - In vm_page_remove() drop the backing vnode when the last page
   is removed.
 - Don't check the vnode to see if it must be reclaimed on every
   call to vm_page_free_toq() as we only check it now when it is
   actually required.  This saves us two lock operations per call.

Sponsored by:	Isilon Systems, Inc.
This commit is contained in:
Jeff Roberson 2005-03-15 14:14:09 +00:00
parent 1bf9ee92ff
commit 761dbeb66f
1 changed files with 10 additions and 19 deletions
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29
sys/vm/vm_page.c
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@ -575,6 +575,11 @@ vm_page_insert(vm_page_t m, vm_object_t object, vm_pindex_t pindex)
* show that the object has one more resident page.
*/
object->resident_page_count++;
/*
* Hold the vnode until the last page is released.
*/
if (object->resident_page_count == 1 && object->type == OBJT_VNODE)
vhold((struct vnode *)object->handle);
/*
* Since we are inserting a new and possibly dirty page,
@ -630,6 +635,11 @@ vm_page_remove(vm_page_t m)
*/
object->resident_page_count--;
object->generation++;
/*
* The vnode may now be recycled.
*/
if (object->resident_page_count == 0 && object->type == OBJT_VNODE)
vdrop((struct vnode *)object->handle);
m->object = NULL;
}
@ -995,7 +1005,6 @@ void
vm_page_free_toq(vm_page_t m)
{
struct vpgqueues *pq;
vm_object_t object = m->object;
mtx_assert(&vm_page_queue_mtx, MA_OWNED);
cnt.v_tfree++;
@ -1039,24 +1048,6 @@ vm_page_free_toq(vm_page_t m)
panic("vm_page_free: freeing wired page");
}
/*
* If we've exhausted the object's resident pages we want to free
* it up.
*/
if (object &&
(object->type == OBJT_VNODE) &&
((object->flags & OBJ_DEAD) == 0)
) {
struct vnode *vp = (struct vnode *)object->handle;
if (vp) {
VI_LOCK(vp);
if (VSHOULDFREE(vp))
vfree(vp);
VI_UNLOCK(vp);
}
}
/*
* Clear the UNMANAGED flag when freeing an unmanaged page.
*/