Hello, This patchset reimplements (yeah, once more) so that FLUSH/FUA requests can be merged. This is inspired by Darrick's patches to merge multiple zero-data flushes which helps workloads with highly concurrent fsync requests. For more information, please read the patch description on the third patch. 0001-block-add-REQ_FLUSH_SEQ.patch 0002-block-improve-flush-bio-completion.patch 0003-block-reimplement-FLUSH-FUA-to-support-merge.patch 0001-0002 prepare for the reimplementation. 0003 reimplements. Tested on FLUSH+FUA, FLUSH, and no FLUSH configurations. Works pretty solid for me. Darrick says that preliminary performance test looks okay. Darrick, please use this version for further testing as I fixed a few problems. This patchset is based on 2.6.38-rc1 (2b1caf6e) and available in the following git branch, git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git block-flush-merge and contains the following changes. block/blk-core.c | 56 ++--- block/blk-flush.c | 441 +++++++++++++++++++++++++++++++--------------- block/blk.h | 12 - block/elevator.c | 7 include/linux/blk_types.h | 2 include/linux/blkdev.h | 18 + include/linux/elevator.h | 1 7 files changed, 355 insertions(+), 182 deletions(-) Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
