[all-commits] [llvm/llvm-project] 243ddf: [libc] add shrink in-place support for reallocatio...

[Schrodinger ZHU Yifan via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 243ddf607bbe4841cfe734507120c8d8ddc41eca
      https://github.com/llvm/llvm-project/commit/243ddf607bbe4841cfe734507120c8d8ddc41eca
  Author: Schrodinger ZHU Yifan <yfzhu at google.com>
  Date:   2026-06-02 (Tue, 02 Jun 2026)

  Changed paths:
    M libc/src/__support/block.h
    M libc/src/__support/freelist_heap.h
    M libc/src/__support/freestore.h
    M libc/test/src/__support/CMakeLists.txt
    M libc/test/src/__support/block_test.cpp
    M libc/test/src/__support/freelist_heap_test.cpp

  Log Message:
  -----------
  [libc] add shrink in-place support for reallocations (#200272)

This PR adds shrinking in-place for the freelist heap. This allows the
heap to reuse the place if the reallocation shrinks the size larger than
a minimal block unit.

Synthesized random action tests show that that increase heap utilization
rate from 87% to 97% percent, basically aligns with the expectation of
dlmalloc.

Assisted-by: AI tools, manually checked.



To unsubscribe from these emails, change your notification settings at https://github.com/llvm/llvm-project/settings/notifications