[release/9.0-staging] improve distribute_free_regions #115167
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Pull Request Overview
This PR backports changes to improve free-list management in the garbage collector. The key changes include updating the free_region_kind enum to better distinguish region types, adding new free-list management methods to gc_heap, and introducing separate age thresholds for basic, large, and huge regions.
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Port change for better free-list management. This is a back port of #109431
Customer Impact
Memory utilization regression as part of Regions Enablement. Reported by a customer here: #103582.
The fix is to improve distribute_free_regions where aged regions are added to decommit list to ultimately free.
Regression
Yes in memory utilization. For certain customers who were running with dense containers they would observe an OOM occasionally.
Testing
Verified with internal performance testing. Provided a private to the customer to try out and they confirmed their memory utilization improved after the fix.
Risk
Low, this only impacts how free regions are deallocated.