There are also legitimate uses of overcommit for reserving huge areas of virtual memory and relying on demand paging to allocate physical memory, although stric

There are also legitimate uses of overcommit for reserving huge areas of virtual memory and relying on demand paging to allocate physical memory, although strictly speaking enabling overcommit isn’t necessary if you separate the “reserve” (mmap(PROT_NONE)) and “commit” (mmap(MAP_FIXED, PROT_READ | PROT_WRITE)) stages (which is what Windows forces you to do).