Hello, this patchset adds to the Xen PV block driver support to exploit the multi- queue block layer API by sharing and using multiple I/O rings in the frontend and backend. It is the result of my internship for GNOME's Outreach Program for Women ([1]), in which I was mentored by Konrad Rzeszutek Wilk.
The patchset implements in the backend driver the retrieval of information about the currently-in-use block layer API for a certain device and about the number of available submission queues, if the API turns out to be the multi-queue one. The information is then advertised to the frontend driver via XenStore. The frontend device can exploit such an information to allocate and grant multiple I/O rings that the backend will be able to map. The patchset has been tested with fio's IOmeter emulation on a four-cores machine with a null_blk device (some results are available here: [2]). This patch series is just an RFC prototype. Any comments or suggestions are more than welcome. Thank you, Arianna [1] http://goo.gl/bcvHMh [2] http://goo.gl/O8RlLL Arianna Avanzini (4): xen, blkfront: add support for the multi-queue block layer API xen, blkfront: factor out flush-related checks from do_blkif_request() xen, blkfront: introduce support for multiple hw queues xen, blkback: add support for multiple block rings drivers/block/xen-blkback/blkback.c | 376 ++++++++------- drivers/block/xen-blkback/common.h | 111 +++-- drivers/block/xen-blkback/xenbus.c | 475 ++++++++++++------- drivers/block/xen-blkfront.c | 886 +++++++++++++++++++++++------------- 4 files changed, 1151 insertions(+), 697 deletions(-) -- 2.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
