mm: support shrinking brk #106

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sunhaosheng wants to merge 1 commit into Starry-OS:main from sunhaosheng:brk-shrink

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sunhaosheng commented Dec 31, 2025 •

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Add shrink logic in sys_brk: when the new break is lower than the current top, unmap the corresponding pages
Only reclaim pages above the initially mapped heap region (USER_HEAP_SIZE) to avoid breaking the ELF-loaded heap


          mm: support shrinking brk

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