This v2 eliminates the dm-mpath local cache for per-bio-data and switches to allocating the target required per-bio-data as part of the 'struct dm_noclone' allocation -- special thanks to Mikulas for his ideas and patch (#6) that went into this v2. Test results show a slight improvement for bio-based dm-multipath (but not the kind of win dm-linear gets from switching to noclone): linear: raw=6087MB/s clone=4241MB/s noclone=5148MB/s mpath: raw=6087MB/s clone=3331MB/s noclone=3420MB/s More work is needed to improve DM multipath performance (story of my life)... but at least this shifts the focus away from DM core and back to the dm-multipath target code. Mike Snitzer (6): dm: update dm_process_bio() to split bio if in ->make_request_fn() dm: eliminate 'split_discard_bios' flag from DM target interface dm: improve noclone bio support dm: improve noclone_endio() to support multipath target dm mpath: enable noclone support for bio-based dm: remove unused _rq_tio_cache and _rq_cache Mikulas Patocka (3): dm: refactor start_io_acct and end_io_acct dm: implement noclone optimization for bio-based dm: add per-bio-data support to noclone bio drivers/md/dm-cache-target.c | 1 - drivers/md/dm-linear.c | 3 +- drivers/md/dm-mpath.c | 13 +- drivers/md/dm-raid.c | 14 +- drivers/md/dm-rq.c | 16 ++ drivers/md/dm-rq.h | 16 -- drivers/md/dm-stripe.c | 3 +- drivers/md/dm-table.c | 11 ++ drivers/md/dm-thin.c | 1 - drivers/md/dm-zero.c | 1 + drivers/md/dm-zoned-target.c | 1 - drivers/md/dm.c | 406 ++++++++++++++++++++++++++++-------------- drivers/md/dm.h | 1 + include/linux/device-mapper.h | 9 +- include/uapi/linux/dm-ioctl.h | 4 +- 15 files changed, 330 insertions(+), 170 deletions(-) -- 2.15.0 -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
