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Date: Wed, 3 Jan 2007 08:48:24 +0100 From: Jens Axboe <jens.axboe@...cle.com> To: linux-kernel@...r.kernel.org Cc: Nick Piggin <nickpiggin@...oo.com.au>, akpm@...l.org Subject: [BLOCK] 0/4 explicit io plugging This series of 4 patches switch the block layer to use explicit plugging instead of the implicit plugging that takes place now when io is queued against an empty queue. The first three patches update RCU to include a QRCU method similar to SRCU. QRCU is a bit heavier on the reader side, but a _lot_ cheaper for the synchronization part. The new plugging scheme needs to synchronize queue plugs for barriers and queue quiescing, so it needs to be cheap. The fourth patch is the actual meat of the series. It also has a longer explanation of the benefits of the explicit plugging. I'm sending this out to get some review of the code, and to ask people to do some testing. I'm looking for both the "hey it works for me" as well as benchmark runs. In the performance category, I'm interested in both high end (lots of CPUs) testing to see whether this actually does reduce lock contention and block layer cpu utilization as well as more simplistic io performance results on "normal" boxes to make sure we are not regressing anywhere. This code is also available in the 'plug' branch of the block layer git repo: git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-2.6-block.git/ Documentation/RCU/checklist.txt | 13 + Documentation/RCU/rcu.txt | 6 Documentation/RCU/torture.txt | 15 - Documentation/RCU/whatisRCU.txt | 3 Documentation/block/biodoc.txt | 5 block/as-iosched.c | 15 - block/cfq-iosched.c | 8 block/deadline-iosched.c | 9 block/elevator.c | 44 --- block/ll_rw_blk.c | 483 ++++++++++++++++++++-------------------- block/noop-iosched.c | 8 drivers/block/cciss.c | 6 drivers/block/cpqarray.c | 3 drivers/block/floppy.c | 1 drivers/block/loop.c | 12 drivers/block/pktcdvd.c | 5 drivers/block/rd.c | 2 drivers/block/umem.c | 16 - drivers/ide/ide-cd.c | 9 drivers/ide/ide-io.c | 25 -- drivers/md/bitmap.c | 1 drivers/md/dm-emc.c | 2 drivers/md/dm-table.c | 14 - drivers/md/dm.c | 18 - drivers/md/dm.h | 1 drivers/md/linear.c | 14 - drivers/md/md.c | 3 drivers/md/multipath.c | 32 -- drivers/md/raid0.c | 17 - drivers/md/raid1.c | 70 ----- drivers/md/raid10.c | 73 ------ drivers/md/raid5.c | 60 ---- drivers/message/i2o/i2o_block.c | 6 drivers/mmc/mmc_queue.c | 3 drivers/s390/block/dasd.c | 3 drivers/s390/char/tape_block.c | 1 drivers/scsi/ide-scsi.c | 2 drivers/scsi/scsi_lib.c | 47 +-- fs/adfs/inode.c | 1 fs/affs/file.c | 2 fs/befs/linuxvfs.c | 1 fs/bfs/file.c | 1 fs/block_dev.c | 2 fs/buffer.c | 25 -- fs/cifs/file.c | 2 fs/direct-io.c | 7 fs/ecryptfs/mmap.c | 23 - fs/efs/inode.c | 1 fs/ext2/inode.c | 2 fs/ext3/inode.c | 3 fs/ext4/inode.c | 3 fs/fat/inode.c | 1 fs/freevxfs/vxfs_subr.c | 1 fs/fuse/inode.c | 1 fs/gfs2/ops_address.c | 1 fs/hfs/inode.c | 2 fs/hfsplus/inode.c | 2 fs/hpfs/file.c | 1 fs/isofs/inode.c | 1 fs/jfs/inode.c | 1 fs/jfs/jfs_metapage.c | 1 fs/minix/inode.c | 1 fs/ntfs/aops.c | 4 fs/ntfs/compress.c | 2 fs/ocfs2/aops.c | 1 fs/ocfs2/cluster/heartbeat.c | 4 fs/qnx4/inode.c | 1 fs/reiserfs/inode.c | 1 fs/sysv/itree.c | 1 fs/udf/file.c | 1 fs/udf/inode.c | 1 fs/ufs/inode.c | 1 fs/ufs/truncate.c | 2 fs/xfs/linux-2.6/xfs_aops.c | 1 fs/xfs/linux-2.6/xfs_buf.c | 15 - include/linux/backing-dev.h | 3 include/linux/blkdev.h | 75 +++--- include/linux/buffer_head.h | 1 include/linux/elevator.h | 8 include/linux/fs.h | 1 include/linux/pagemap.h | 12 include/linux/raid/md.h | 1 include/linux/sched.h | 1 include/linux/srcu.h | 30 ++ include/linux/swap.h | 2 kernel/rcutorture.c | 71 +++++ kernel/sched.c | 1 kernel/srcu.c | 105 ++++++++ mm/filemap.c | 62 ----- mm/nommu.c | 4 mm/page-writeback.c | 8 mm/readahead.c | 11 mm/shmem.c | 1 mm/swap_state.c | 5 mm/swapfile.c | 37 --- mm/vmscan.c | 6 96 files changed, 632 insertions(+), 989 deletions(-) -- Jens Axboe - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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