It should not break userland. GNU/Linux (not necessarily Android though) has supported 64K pages pretty much from the start because that was the originally page

It should not break userland. GNU/Linux (not necessarily Android though) has supported 64K pages pretty much from the start because that was the originally page size chosen for server-focus kernels and distributions. But there are some things that need to be worked around. Certain build processes determine the page size at compile time and assume it's the same at run time, and fail if it is not: https://github.com/jemalloc/jemalloc/issues/467 https://github.com/jemalloc/jemalloc/issues/467 Some memory-mapped files formats have assumptions about page granularity: https://bugzilla.redhat.com/show_bug.cgi?id=1979804 https://bugzilla.redhat.com/show_bug.cgi?id=1979804 The file format issue applies to ELF as well. Some people patch their toolchains (or use suitable linker options) to produce slightly smaller binaries that can only be loaded if the page size is 4K, even though the ABI is pretty clear in that you should link for compatibility with up to 64K pages.