[dm-devel] [PATCH 0/5] blk-mq & dm: fix IO hang and deal with one performance issue
Ming Lei
ming.lei at redhat.com
Mon Jan 22 03:35:45 UTC 2018
Hi Jens,
This 1st patch introduces BLK_STS_DEV_RESOURCE for dealing with IO hang
when non-device resource is run out of and queue is idle, and this
approach is suggested by you.
The 2nd and 3rd patches cleans dm-rq a bit and prepares for applying
blk_get_request_notify().
The 4th patch introduces blk_get_request_notify(), still suggested by
you.
The last patch applies blk_get_request_notify() and avoids one
DM specific performance issue which is introduced by the 1st patch.
These 5 patches are against both dm(dm-4.16) and block tree(for-4.16/block).
Ming Lei (5):
blk-mq: introduce BLK_STS_DEV_RESOURCE
dm-rq: handle dispatch exception in dm_dispatch_clone_request()
dm-rq: return BLK_STS_* from map_request()
blk-mq: introduce blk_get_request_notify
dm-mpath: use blk_mq_alloc_request_notify for allocating blk-mq req
block/blk-core.c | 1 +
block/blk-mq-tag.c | 27 +++++++++++++++++++++-
block/blk-mq.c | 43 +++++++++++++++++++++++++++++------
block/blk-mq.h | 1 +
drivers/block/null_blk.c | 2 +-
drivers/block/virtio_blk.c | 2 +-
drivers/block/xen-blkfront.c | 2 +-
drivers/md/dm-mpath.c | 50 ++++++++++++++++++++++++++++++++++++++++-
drivers/md/dm-rq.c | 53 +++++++++++++++++++++++++++-----------------
drivers/md/dm.c | 1 +
drivers/scsi/scsi_lib.c | 6 ++---
include/linux/blk-mq.h | 5 +++++
include/linux/blk_types.h | 7 ++++++
13 files changed, 165 insertions(+), 35 deletions(-)
--
2.9.5
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