diff options
| -rw-r--r-- | sys/vm/vm_object.c | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/sys/vm/vm_object.c b/sys/vm/vm_object.c index 250b769..a9de554 100644 --- a/sys/vm/vm_object.c +++ b/sys/vm/vm_object.c @@ -938,7 +938,7 @@ vm_object_sync(vm_object_t object, vm_ooffset_t offset, vm_size_t size, vm_object_t backing_object; struct vnode *vp; struct mount *mp; - int flags; + int flags, fsync_after; if (object == NULL) return; @@ -971,11 +971,26 @@ vm_object_sync(vm_object_t object, vm_ooffset_t offset, vm_size_t size, (void) vn_start_write(vp, &mp, V_WAIT); vfslocked = VFS_LOCK_GIANT(vp->v_mount); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); - flags = (syncio || invalidate) ? OBJPC_SYNC : 0; - flags |= invalidate ? OBJPC_INVAL : 0; + if (syncio && !invalidate && offset == 0 && + OFF_TO_IDX(size) == object->size) { + /* + * If syncing the whole mapping of the file, + * it is faster to schedule all the writes in + * async mode, also allowing the clustering, + * and then wait for i/o to complete. + */ + flags = 0; + fsync_after = TRUE; + } else { + flags = (syncio || invalidate) ? OBJPC_SYNC : 0; + flags |= invalidate ? (OBJPC_SYNC | OBJPC_INVAL) : 0; + fsync_after = FALSE; + } VM_OBJECT_LOCK(object); vm_object_page_clean(object, offset, offset + size, flags); VM_OBJECT_UNLOCK(object); + if (fsync_after) + (void) VOP_FSYNC(vp, MNT_WAIT, curthread); VOP_UNLOCK(vp, 0); VFS_UNLOCK_GIANT(vfslocked); vn_finished_write(mp); |
