> I can't find mmap must give zeroed memory in the mmap manual. > Is there any reason relying on anon mmap() giving zerod memory?
Its how all Unix/Linux like systems behave. You have to clear the memory to something to deal with security on any kind of real system, and zero is a good a value as any > > Personally, I'd prefer to maintain compatibility with MMU-mode wherever > > possible, but I'm happy with overrides like the MAP_UNINITIALISED flag > > suggested. > > > Not necessary IMHO. mmap() for anonymous memory pools should not normally be a hot path, because the C library malloc is supposed to show some brains. If you need special behaviour (eg for performance hacks) then create yourself a /dev/zero like device which just maps uncleared pages. Its not much code and it keeps special cases out of the core kernel. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
