tree 3eddba8c77d3a4cead4958e60a45018c6efc66d1
parent 89d7197b8939ae332ec50a3ff3bc4b2c5558b555
author Ryan Macnak <rmacnak@google.com> 1702346175 +0000
committer Commit Queue <dart-scoped@luci-project-accounts.iam.gserviceaccount.com> 1702346175 +0000

[vm, gc] Mark through new-space.

 - Initial and final marking no longer visit all of new-space, reducing the STW pause for major GC.
 - A scavenge during concurrent marking must forward / filter objects in the marking worklist that are moved / collected, increasing the STW pause for minor GC.
 - Unreachable intergenerational cycles and weak references are collected in the next mark-sweep instead of first requiring enough scavenges to promote the whole cycle or weak target into old-space.
 - Artificial minor GCs are no longer needed to avoid memory leaks from back-to-back major GCs.
 - reachabilityBarrier is now just a count of major GCs.

TEST=ci
Change-Id: Ic7754e8d972763654eae2b7faa8670735d9cda3f
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/340644
Reviewed-by: Siva Annamalai <asiva@google.com>
Commit-Queue: Ryan Macnak <rmacnak@google.com>