Author: kib
Date: Mon May 6 21:04:42 2013
New Revision: 250310
URL: http://svnweb.freebsd.org/changeset/base/250310
Log:
Avoid deactivating the page if it is already on a queue, only requeue
the page. This both reduces the number of queues locking and avoids
moving the active page to inactive list just because the page was read
or written.
Based on the suggestion by: alc
Reviewed by: alc
Tested by: pho
Modified:
head/sys/fs/tmpfs/tmpfs_vnops.c
Modified: head/sys/fs/tmpfs/tmpfs_vnops.c
==============================================================================
--- head/sys/fs/tmpfs/tmpfs_vnops.c Mon May 6 20:58:02 2013
(r250309)
+++ head/sys/fs/tmpfs/tmpfs_vnops.c Mon May 6 21:04:42 2013
(r250310)
@@ -493,10 +493,12 @@ tmpfs_nocacheread(vm_object_t tobj, vm_p
VM_OBJECT_WLOCK(tobj);
vm_page_lock(m);
vm_page_unhold(m);
- vm_page_deactivate(m);
- /* Requeue to maintain LRU ordering. */
- if (m->queue != PQ_NONE)
+ if (m->queue == PQ_NONE) {
+ vm_page_deactivate(m);
+ } else {
+ /* Requeue to maintain LRU ordering. */
vm_page_requeue(m);
+ }
vm_page_unlock(m);
VM_OBJECT_WUNLOCK(tobj);
@@ -609,10 +611,12 @@ tmpfs_mappedwrite(vm_object_t tobj, size
vm_page_dirty(tpg);
vm_page_lock(tpg);
vm_page_unhold(tpg);
- vm_page_deactivate(tpg);
- /* Requeue to maintain LRU ordering. */
- if (tpg->queue != PQ_NONE)
+ if (tpg->queue == PQ_NONE) {
+ vm_page_deactivate(tpg);
+ } else {
+ /* Requeue to maintain LRU ordering. */
vm_page_requeue(tpg);
+ }
vm_page_unlock(tpg);
VM_OBJECT_WUNLOCK(tobj);
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