On Wed, Aug 14, 2013 at 04:38:12PM -0700, Andy Lutomirski wrote: > > It would be better to write zeros to it, so we aren't measuring the > > cost of the unwritten->written conversion. > > At the risk of beating a dead horse, how hard would it be to defer > this part until writeback? Part of the work has to be done at write time because we need to update allocation statistics (i.e., so that we don't have ENOSPC problems). The unwritten->written conversion does happen at writeback (as does the actual block allocation if we are doing delayed allocation). The point is that if the goal is to measure page fault scalability, we shouldn't have this other stuff happening as the same time as the page fault workload. - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
