Open Bug 1507434 Opened 6 years ago Updated 2 years ago

Use tagged pointers to reduce the memory usage of observer lists

Categories

(Core :: XPCOM, enhancement)

Product:
Core
Component:
XPCOM
Type:
enhancement

Tracking

()

People

(Reporter: gsvelto, Unassigned)

References

(Blocks 2 open bugs)

Details

(Whiteboard: [overhead:4k]) 

Observer lists use 16 bytes per entry (on 64-bit hots) due to structure size rounding. Using tagged pointers would allow us to reserve an unused bit in the listener pointer to represent the weak boolean member variable and cut the storage requirements in half.
Severity: normal → S3
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