Hi, I've rebased Ming's latest [1] ontop of dm-5.18 [2] (which is based on for-5.18/block). End result available in dm-5.18-biopoll branch [3] These changes add bio polling support to DM. Tested with linear and striped DM targets. IOPS improvement was ~5% on my baremetal system with a single Intel Optane NVMe device (555K hipri=1 vs 525K hipri=0). Ming has seen better improvement while testing within a VM: dm-linear: hipri=1 vs hipri=0 15~20% iops improvement dm-stripe: hipri=1 vs hipri=0 ~30% iops improvement I'd like to merge these changes via the DM tree when the 5.18 merge window opens. The first block patch that adds ->poll_bio to block_device_operations will need review so that I can take it through the DM tree. Reason for going through the DM tree is there have been some fairly extensive changes queued in dm-5.18 that build on for-5.18/block. So I think it easiest to just add the block depenency via DM tree since DM is first consumer of ->poll_bio FYI, Ming does have another DM patch [4] that looks to avoid using hlist but I only just saw it. bio_split() _is_ involved (see dm_split_and_process_bio) so I'm not exactly sure where he is going with that change. But that is DM-implementation detail that we'll sort out. Big thing is we need approval for the first block patch to go to Linus via the DM tree ;) Thanks, Mike [1] https://github.com/ming1/linux/commits/my_v5.18-dm-bio-poll [2] https://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm.git/log/?h=dm-5.18 [3] https://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm.git/log/?h=dm-5.18-biopoll [4] https://github.com/ming1/linux/commit/c107c30e15041ac1ce672f56809961406e2a3e52 v5: remove WARN_ONs in ->poll_bio interface patch. Fixed comment typo along the way (found while seeing how other block_device_operations are referenced in block's code comments). Ming Lei (2): block: add ->poll_bio to block_device_operations dm: support bio polling block/blk-core.c | 14 +++-- block/genhd.c | 4 ++ drivers/md/dm-core.h | 2 + drivers/md/dm-table.c | 27 +++++++++ drivers/md/dm.c | 150 ++++++++++++++++++++++++++++++++++++++++++++++++- include/linux/blkdev.h | 2 + 6 files changed, 191 insertions(+), 8 deletions(-) -- 2.15.0
