Version 2 of the hack/patchset, that enables blk-mq to use the legacy IO schedulers with single queue devices. Original posting is here: https://marc.info/?l=linux-block&m=148073493203664&w=2 You can also found this version in the following git branch: git://git.kernel.dk/linux-block blk-mq-legacy-sched.2 and new developments/fixes will happen in the 'blk-mq-legacy-sched' branch. Changes since v1: - Remove the default 'deadline' hard wiring, and provide Kconfig entries to set the blk-mq scheduler. This now works like for legacy devices. - Rename blk_use_mq_path() to blk_use_sched_path() to make it more clear. Suggested by Johannes Thumshirn. - Fixup a spot where we did not use the accessor function to determine what path to use. - Flush mq software queues, even if IO scheduler managed. This should make paths work that are MQ aware, and using only MQ interfaces. - Cleanup free path of MQ request. - Account when IO was queued to a hardware context, similarly to the regular MQ path. - Add BLK_MQ_F_NO_SCHED flag, so that drivers can explicitly ask for no scheduling on a queue. Add this for NVMe admin queues. - Kill BLK_MQ_F_SCHED, since we now have Kconfig entries for setting the desired IO scheduler. - Fix issues with live scheduler switching through sysfs. Should now be solid, even with lots of IO running on the device. - Drop null_blk and SCSI changes, not needed anymore. block/Kconfig.iosched | 29 ++++ block/blk-core.c | 77 ++++++----- block/blk-exec.c | 12 + block/blk-flush.c | 40 +++-- block/blk-merge.c | 5 block/blk-mq.c | 332 +++++++++++++++++++++++++++++++++++++++++++++--- block/blk-mq.h | 1 block/blk-sysfs.c | 2 block/blk.h | 16 ++ block/cfq-iosched.c | 22 ++- block/elevator.c | 125 ++++++++++++------ drivers/nvme/host/pci.c | 1 include/linux/blk-mq.h | 1 include/linux/blkdev.h | 2 14 files changed, 555 insertions(+), 110 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-block" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
