On 03/19/2015 08:17 PM, Christoph Hellwig wrote: <> > > In addition to the options there's also a time line. At least for the > short term where we want to get something going 1a seems like the > absolutely be option. It works perfectly fine for the lots of small > capacity dram-like nvdimms, and it works funtionally fine for the > special huge ones, although the resource use for it is highly annoying. > If it turns out to be too annoying we can also offer a no I/O possible > option for them in the short run. > Finally some voice in the dessert. > In the long run option 2) sounds like a good plan to me, but not as a > parallel I/O path, but as the main one. Doing so will in fact give us > options to experiment with 3). Given that we're moving towards an > increasinly huge page using world replacing the good old struct page > with something extent-like and/or temporary might be needed for dram > as well in the future. Why ? why not just make page mean page_size(page) and mostly even that is not needed. Any changes to bio will only solve bio. And will push the problem to the next subsystem. Fix the PAGE_SIZE problem and you fixed it for all subsystems, not only bio. And I believe it is the smaller change by far. Because in most places PAGE_SIZE just means MIN_PAGE_SIZE when we try calculate some array sizes for storage of a given "io-length", this is surly 4k, but then when the actual run time is preformed we usually have a length specifier like bv_len. (And the few places that do not are easy to fix I believe) Thanks Boaz -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
