Memory allocators generally don't unmap anything, because the performance hit on any other threads running is severe.
When memory is unmapped, caches of memory mappings of other threads are discarded, via inter-core interrupts. Then they get misses until their cache is restored.
In what might be a multi-thread program, you don't fool with the memory map without very good reasons. Mapping new pages, or marking a page r/o or r/w is OK; anything else, probably not.
When memory is unmapped, caches of memory mappings of other threads are discarded, via inter-core interrupts. Then they get misses until their cache is restored.
In what might be a multi-thread program, you don't fool with the memory map without very good reasons. Mapping new pages, or marking a page r/o or r/w is OK; anything else, probably not.