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added dom obj counting to decide sequential/parallel layout (#10110)
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6c3e94805f
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5 changed files with 67 additions and 32 deletions
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@ -283,6 +283,12 @@ pub struct Document {
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last_click_info: DOMRefCell<Option<(Instant, Point2D<f32>)>>,
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/// https://html.spec.whatwg.org/multipage/#ignore-destructive-writes-counter
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ignore_destructive_writes_counter: Cell<u32>,
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/// Track the total number of elements in this DOM's tree.
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/// This is sent to the layout thread every time a reflow is done;
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/// layout uses this to determine if the gains from parallel layout will be worth the overhead.
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///
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/// See also: https://github.com/servo/servo/issues/10110
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dom_count: Cell<u32>,
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}
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#[derive(JSTraceable, HeapSizeOf)]
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@ -454,6 +460,22 @@ impl Document {
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self.base_element.set(base.r());
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}
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pub fn dom_count(&self) -> u32 {
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self.dom_count.get()
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}
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/// This is called by `bind_to_tree` when a node is added to the DOM.
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/// The internal count is used by layout to determine whether to be sequential or parallel.
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/// (it's sequential for small DOMs)
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pub fn increment_dom_count(&self) {
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self.dom_count.set(self.dom_count.get() + 1);
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}
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/// This is called by `unbind_from_tree` when a node is removed from the DOM.
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pub fn decrement_dom_count(&self) {
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self.dom_count.set(self.dom_count.get() - 1);
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}
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pub fn quirks_mode(&self) -> QuirksMode {
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self.quirks_mode.get()
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}
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@ -1880,6 +1902,7 @@ impl Document {
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target_element: MutNullableHeap::new(None),
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last_click_info: DOMRefCell::new(None),
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ignore_destructive_writes_counter: Default::default(),
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dom_count: Cell::new(1),
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}
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}
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@ -2151,10 +2151,12 @@ impl VirtualMethods for Element {
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return;
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}
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let doc = document_from_node(self);
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if let Some(ref value) = *self.id_attribute.borrow() {
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let doc = document_from_node(self);
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doc.register_named_element(self, value.clone());
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}
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// This is used for layout optimization.
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doc.increment_dom_count();
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}
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fn unbind_from_tree(&self, context: &UnbindContext) {
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@ -2164,10 +2166,12 @@ impl VirtualMethods for Element {
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return;
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}
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let doc = document_from_node(self);
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if let Some(ref value) = *self.id_attribute.borrow() {
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let doc = document_from_node(self);
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doc.unregister_named_element(self, value.clone());
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}
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// This is used for layout optimization.
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doc.decrement_dom_count();
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}
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fn children_changed(&self, mutation: &ChildrenMutation) {
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@ -1083,6 +1083,7 @@ impl Window {
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window_size: window_size,
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script_join_chan: join_chan,
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query_type: query_type,
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dom_count: self.Document().dom_count(),
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};
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self.layout_chan.send(Msg::Reflow(reflow)).unwrap();
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