brody-qq 2a164dc923 Kernel/Memory: Fix overcommit when cloning anonymous mmap objects ...

AnonymousVMObject::try_clone() computed how many shared cow pages to
commit by counting all VMObject pages that were not shared_zero_pages.

This means that lazy_committed_pages were also being included in the
count. This is a problem because the page fault handling code for
lazy_committed_pages does not allocate from
m_shared_committed_cow_pages. So more pages than necessary were being
committed.

This fixes this overcommitting problem by skipping lazy_committed_pages
when counting how many pages to commit.

2024-07-12 08:52:06 -04:00

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