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vm_fault: Avoid unnecessary object relocking in vm_fault_copy_entry()

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Suggested by:	alc
Reviewed by:	alc, kib
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D35485
This commit is contained in:
Mark Johnston 2022-06-14 16:37:35 -04:00
parent d0443e2b98
commit 1f88394b7f
1 changed files with 2 additions and 3 deletions
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5
sys/vm/vm_fault.c
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@ -2122,7 +2122,6 @@ vm_fault_copy_entry(vm_map_t dst_map, vm_map_t src_map,
break;
}
}
VM_OBJECT_WUNLOCK(dst_object);
/*
* Enter it in the pmap. If a wired, copy-on-write
@ -2137,15 +2136,15 @@ vm_fault_copy_entry(vm_map_t dst_map, vm_map_t src_map,
* 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);