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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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23 changed files with 467 additions and 236 deletions
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12
components/servo/Cargo.lock generated
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@ -1162,7 +1162,7 @@ dependencies = [
"rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
"script_layout_interface 0.0.1",
"script_traits 0.0.1",
"selectors 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)",
"selectors 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
"serde_macros 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
"smallvec 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
"string_cache 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
@ -1931,7 +1931,7 @@ dependencies = [
"rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
"script_layout_interface 0.0.1",
"script_traits 0.0.1",
"selectors 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)",
"selectors 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
"serde 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
"smallvec 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
"string_cache 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
@ -1968,7 +1968,7 @@ dependencies = [
"profile_traits 0.0.1",
"range 0.0.1",
"script_traits 0.0.1",
"selectors 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)",
"selectors 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
"string_cache 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
"style 0.0.1",
"url 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@ -2017,7 +2017,7 @@ dependencies = [
[[package]]
name = "selectors"
version = "0.8.2"
version = "0.9.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
@ -2239,7 +2239,7 @@ dependencies = [
"plugins 0.0.1",
"rand 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
"rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
"selectors 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)",
"selectors 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
"serde 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
"serde_macros 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
"smallvec 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
@ -2259,7 +2259,7 @@ dependencies = [
"cssparser 0.5.7 (registry+https://github.com/rust-lang/crates.io-index)",
"euclid 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
"rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
"selectors 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)",
"selectors 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
"string_cache 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
"style 0.0.1",
"style_traits 0.0.1",