Bug 238374

Summary: Reduce EventListenerVector's minimum capacity from 16 to 2
Product: WebKit Reporter: Chris Dumez <cdumez>
Component: WebCore Misc.Assignee: Chris Dumez <cdumez>
Status: RESOLVED FIXED    
Severity: Normal CC: esprehn+autocc, ews-watchlist, ggaren, kangil.han, webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   
Attachments:
Description Flags
Patch none

Description Chris Dumez 2022-03-25 07:43:12 PDT 
Reduce EventListenerVector's minimum capacity from 16 to 2 to save memory and get a small speedup on Speedometer.
Very few event listeners are registered for a given type in the common case so eagerly allocating enough memory for 16 is wasteful.
This is a confirmed 0.4% progression on Speedometer according to A/B bots.
Comment 1 Chris Dumez 2022-03-25 07:44:10 PDT 
Created attachment 455760 [details]
Patch
Comment 2 Geoffrey Garen 2022-03-25 09:54:09 PDT 
Comment on attachment 455760 [details]
Patch

r=me
Comment 3 EWS 2022-03-25 10:40:17 PDT 
Committed r291866 (248872@main): <https://commits.webkit.org/248872@main>

All reviewed patches have been landed. Closing bug and clearing flags on attachment 455760 [details].
Comment 4 Radar WebKit Bug Importer 2022-03-25 10:41:18 PDT 
<rdar://problem/90845294>