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Subject[PATCH 0/6] Page I/O
Date
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(-)



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