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For unlinked files, do not msync(2) or sync on the vnode deactivation.

Browse source 
One consequence of the patch is that msyncing unlinked file mappings
no longer reduces the amount of the dirty memory in the system, but I
do not think that there are users of msync(2) that utilize it for such
side-effect.

Reported and tested by:	tjil
PR:	222356
Reviewed by:	alc
Sponsored by:	The FreeBSD Foundation
MFC after:	2 weeks
Differential revision:	https://reviews.freebsd.org/D12411
This commit is contained in:
Konstantin Belousov 2017-09-19 16:46:37 +00:00
parent ab99509219
commit 5bf949377e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=323768
2 changed files with 4 additions and 4 deletions
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4
sys/kern/vfs_subr.c
View file

@ -3054,8 +3054,8 @@ vinactive(struct vnode *vp, struct thread *td)
* point that VOP_INACTIVE() is called, there could still be
* pending I/O and dirty pages in the object.
*/
obj = vp->v_object;
if (obj != NULL && (obj->flags & OBJ_MIGHTBEDIRTY) != 0) {
if ((obj = vp->v_object) != NULL && (vp->v_vflag & VV_NOSYNC) == 0 &&
(obj->flags & OBJ_MIGHTBEDIRTY) != 0) {
VM_OBJECT_WLOCK(obj);
vm_object_page_clean(obj, 0, 0, 0);
VM_OBJECT_WUNLOCK(obj);

4
sys/vm/vm_object.c
View file

@ -1083,8 +1083,8 @@ vm_object_sync(vm_object_t object, vm_ooffset_t offset, vm_size_t size,
* I/O.
*/
if (object->type == OBJT_VNODE &&
(object->flags & OBJ_MIGHTBEDIRTY) != 0) {
vp = object->handle;
(object->flags & OBJ_MIGHTBEDIRTY) != 0 &&
((vp = object->handle)->v_vflag & VV_NOSYNC) == 0) {
VM_OBJECT_WUNLOCK(object);
(void) vn_start_write(vp, &mp, V_WAIT);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);