Return freed memory to the OS on a background thread instead of the JS thread - #34181

Merged

Jarred-Sumner merged 14 commits into

mainfrom

claude/idle-theap-handoff

Jul 16, 2026

Commits on Jul 14, 2026

usockets: sweep mimalloc's heaps while the loop is parked, not before it parks
Jarred-Sumner
committed
34afcea
usockets: hand the heaps over on every tick, and use mimalloc's header
Jarred-Sumner
committed
c094bd9

Commits on Jul 15, 2026

deps: bump mimalloc for the interruptible collect phase
Jarred-Sumner
committed
38f5d78
usockets: sweep inline only when there is no scavenger to hand off to
Jarred-Sumner
committed
7a84c86
jsc: return the JS thread's mimalloc pages to the arena when the heap moves
Jarred-Sumner
committed
c8abd3e
Revert "jsc: return the JS thread's mimalloc pages to the arena when the heap moves"
Jarred-Sumner
committed
a908c8a
Reapply "jsc: return the JS thread's mimalloc pages to the arena when the heap moves"
Jarred-Sumner
committed
edd3e53
jsc: collect the JS thread's theap when a collection shrinks the heap
Jarred-Sumner
committed
3c8728e
jsc: collect the JS thread's theap after a collection, when the loop never parks
Jarred-Sumner
committed
f745562
[autofix.ci] apply automated fixes
autofix-ci[bot]
authored
c015194
jsc: trim the theap-collect comments to the durable content
Jarred-Sumner
committed
c0068c6
jsc: drop the unused theap-collect counter
Jarred-Sumner
committed
868c47b
Revert the GC-controller theap collect: measured, it does nothing
Jarred-Sumner
committed
0d9ba34

Commits on Jul 16, 2026

deps: bump mimalloc to bun-dev3-v2 with the idle-theap handoff
Jarred-Sumner
committed
d940463