This patch set implements pageio as I described in my talk at Linux.Conf.AU. It's for review more than application, I think benchmarking is going to be required to see if it's a win. We've done some benchmarking with an earlier version of the patch and a Chatham card, and it's a win for us. The fundamental point of these patches is that we *can* do I/O without allocating a BIO (or request, or ...) and so we can end up doing fun things like swapping out a page without allocating any memory. Possibly it would be interesting to do sub-page I/Os (ie change the rw_page prototype to take a 'start' and 'length' instead of requiring the I/O to be the entire page), but the problem then arises about what the 'done' callback should be. Keith Busch (1): NVMe: Add support for rw_page Matthew Wilcox (5): Add bdev_read_page() and bdev_write_page() Factor page_endio() out of mpage_end_io() swap: Use bdev_read_page() / bdev_write_page() brd: Add support for rw_page virtio_blk: Add rw_page implementation drivers/block/brd.c | 10 +++ drivers/block/nvme-core.c | 129 ++++++++++++++++++++++++++++++++++++--------- drivers/block/virtio_blk.c | 44 +++++++++++++++ fs/block_dev.c | 34 +++++++++++ fs/mpage.c | 83 +++++++++++++++------------- include/linux/blkdev.h | 4 + include/linux/pagemap.h | 2 mm/filemap.c | 25 ++++++++ mm/page_io.c | 23 +++++++- 9 files changed, 288 insertions(+), 66 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
