git: 3fe539651a4b - stable/13 - vm_fault: Avoid unnecessary object relocking in vm_fault_copy_entry()

The branch stable/13 has been updated by markj:

URL: https://cgit.FreeBSD.org/src/commit/?id=3fe539651a4bc8ff6b8e6a2ff5213377cb3f7d88

commit 3fe539651a4bc8ff6b8e6a2ff5213377cb3f7d88
Author:     Mark Johnston <markj@FreeBSD.org>
AuthorDate: 2022-06-14 20:37:35 +0000
Commit:     Mark Johnston <markj@FreeBSD.org>
CommitDate: 2022-06-29 14:12:34 +0000

    vm_fault: Avoid unnecessary object relocking in vm_fault_copy_entry()
    
    Suggested by:   alc
    Reviewed by:    alc, kib
    Sponsored by:   The FreeBSD Foundation
    
    (cherry picked from commit 1f88394b7f35a50507b1faade9e8854f104b563d)
---
 sys/vm/vm_fault.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/sys/vm/vm_fault.c b/sys/vm/vm_fault.c
index 41346f8635ea..0e155ed1f39d 100644
--- a/sys/vm/vm_fault.c
+++ b/sys/vm/vm_fault.c
@@ -2116,7 +2116,6 @@ again:
 				break;
 			}
 		}
-		VM_OBJECT_WUNLOCK(dst_object);
 
 		/*
 		 * Enter it in the pmap. If a wired, copy-on-write
@@ -2131,15 +2130,15 @@ again:
 		 * backing pages.
 		 */
 		if (vm_page_all_valid(dst_m)) {
+			VM_OBJECT_WUNLOCK(dst_object);
 			pmap_enter(dst_map->pmap, vaddr, dst_m, prot,
 			    access | (upgrade ? PMAP_ENTER_WIRED : 0), 0);
+			VM_OBJECT_WLOCK(dst_object);
 		}
 
 		/*
 		 * Mark it no longer busy, and put it on the active list.
 		 */
-		VM_OBJECT_WLOCK(dst_object);
-		
 		if (upgrade) {
 			if (src_m != dst_m) {
 				vm_page_unwire(src_m, PQ_INACTIVE);