On Tue 30-05-17 13:16:50, Pasha Tatashin wrote: > >Could you be more specific? E.g. how are other stores done in > >__init_single_page safe then? I am sorry to be dense here but how does > >the full 64B store differ from other stores done in the same function. > > Hi Michal, > > It is safe to do regular 8-byte and smaller stores (stx, st, sth, stb) > without membar, but they are slower compared to STBI which require a membar > before memory can be accessed. OK, so why cannot we make zero_struct_page 8x 8B stores, other arches would do memset. You said it would be slower but would that be measurable? I am sorry to be so persistent here but I would be really happier if this didn't depend on the deferred initialization. If this is absolutely a no-go then I can live with that of course. -- Michal Hocko SUSE Labs -- To unsubscribe from this list: send the line "unsubscribe linux-s390" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
