On Mon, Aug 10, 2020 at 02:24:03PM -0700, Sonny Rao wrote: > We (Chrome OS) noticed recently one of our tests started failing on > upstream kernels while parsing /proc/zoneinfo > I think this patch is the cause: > > 26e7deadaae17 mm/vmstat.c: do not show lowmem reserve protection > information of empty zone > > Maybe our parser was being overly strict by looking for the protection > line, and it's not hard to fix but raised the question of whether there's > any ABI compatibility guarantees about these files? According to Documentation/admin-guide/sysctl/vm.rst, "Each zone has an array of protection pages". I'm not sure if this is the guarantee, but the doc should reflect the actual format.
