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Rewrite the style sharing candidate cache.

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The style candidate cache had regressed a few times (see #12534), and my
intuition is that being able to disable all style sharing with a single rule in
the page is really unfortunate.

This commit redesigns the style sharing cache in order to be a optimistic cache,
but then reject candidates if they match different sibling-affecting selectors
in the page, for example.

So far the numbers have improved, but not so much as I'd wanted (~10%/20% of
non-incremental restyling time in general). The current implementation is really
dumb though (we recompute and re-match a lot of stuff), so we should be able to
optimise it quite a bit.

I have different ideas for improving it (that may or may not work), apart of the
low-hanging fruit like don't re-matching candidates all the time but I have to
measure the real impact.

Also, I need to verify it against try.
This commit is contained in:
Emilio Cobos Álvarez 2016-07-29 17:24:12 -07:00
parent ec53136863
commit 3af774bd75
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GPG key ID: 056B727BB9C1027C
23 changed files with 467 additions and 236 deletions
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2
components/layout/Cargo.toml
View file

@ -33,7 +33,7 @@ range = {path = "../range"}
rustc-serialize = "0.3"
script_layout_interface = {path = "../script_layout_interface"}
script_traits = {path = "../script_traits"}
selectors = {version = "0.8", features = ["heap_size"]}
selectors = {version = "0.9", features = ["heap_size"]}
serde_macros = "0.8"
smallvec = "0.1"
string_cache = {version = "0.2.23", features = ["heap_size"]}

6
components/layout/traversal.rs
View file

@ -13,7 +13,7 @@ use gfx::display_list::OpaqueNode;
use script_layout_interface::restyle_damage::{BUBBLE_ISIZES, REFLOW, REFLOW_OUT_OF_FLOW, REPAINT, RestyleDamage};
use script_layout_interface::wrapper_traits::{LayoutNode, ThreadSafeLayoutNode};
use std::mem;
use style::context::SharedStyleContext;
use style::context::{LocalStyleContext, SharedStyleContext, StyleContext};
use style::dom::TNode;
use style::selector_impl::ServoSelectorImpl;
use style::traversal::RestyleResult;
@ -81,6 +81,10 @@ impl<'lc, N> DomTraversalContext<N> for RecalcStyleAndConstructFlows<'lc>
fn process_postorder(&self, node: N) {
construct_flows_at(&self.context, self.root, node);
}
fn local_context(&self) -> &LocalStyleContext {
self.context.local_context()
}
}
/// A bottom-up, parallelizable traversal.