Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: b3c5d420be05ac62170f8fd5550773eb54fb6c6f
https://github.com/WebKit/WebKit/commit/b3c5d420be05ac62170f8fd5550773eb54fb6c6f
Author: Antti Koivisto <[email protected]>
Date: 2023-10-10 (Tue, 10 Oct 2023)
Changed paths:
M Source/WebCore/dom/InlineStyleSheetOwner.cpp
M Source/WebCore/style/StyleScope.cpp
Log Message:
-----------
Use of many shadow trees with unique style triggers significant CPU usage and
a rise in process size
https://bugs.webkit.org/show_bug.cgi?id=260925
rdar://114731415
Reviewed by Alan Baradlay.
Style resolver sharing cache in Style::Scope has unlimited size and the test
case keeps adding more items
there. Low memory handler clears the cache causing memory use to eventually
drop.
* Source/WebCore/dom/InlineStyleSheetOwner.cpp:
(WebCore::InlineStyleSheetOwner::createSheet):
Increase the size of the inline stylesheet sharing cache (50 -> 256 items).
Content that uses many unique
shadow tree style (like this test) could overrun this smallish cache easily
rendering it ineffective.
Style resolver sharing in Style::Scope depends on inline stylesheet getting
shared so this also made
that cache work poorly.
* Source/WebCore/style/StyleScope.cpp:
(WebCore::Style::Scope::createOrFindSharedShadowTreeResolver):
Add a limit to the resolver sharing cache size.
Canonical link: https://commits.webkit.org/269142@main
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