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Christoph Hellwig 209fb87a25 xfs simplify and speed up direct I/O completions 
Our current handling of direct I/O completions is rather suboptimal,
because we defer it to a workqueue more often than needed, and we
perform a much to aggressive flush of the workqueue in case unwritten
extent conversions happen.

This patch changes the direct I/O reads to not even use a completion
handler, as we don't bother to use it at all, and to perform the unwritten
extent conversions in caller context for synchronous direct I/O.

For a small I/O size direct I/O workload on a consumer grade SSD, such as
the untar of a kernel tree inside qemu this patch gives speedups of
about 5%.  Getting us much closer to the speed of a native block device,
or a fully allocated XFS file.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Alex Elder <aelder@sgi.com>
2010-07-26 16:09:19 -05:00
..
linux-2.6 xfs simplify and speed up direct I/O completions 2010-07-26 16:09:19 -05:00
quota xfs: simplify xfs_truncate_file 2010-07-26 13:16:52 -05:00
support xfs: drop dmapi hooks 2010-07-26 13:16:33 -05:00
Kconfig
Makefile xfs: simplify log item descriptor tracking 2010-07-26 13:16:34 -05:00
xfs.h
xfs_acl.h xfs: constify xattr_handler 2010-05-21 18:31:19 -04:00
xfs_ag.h xfs: fix access to upper inodes without inode64 2010-05-28 15:19:56 -05:00
xfs_alloc.c xfs: fix gcc 4.6 set but not read and unused statement warnings 2010-07-26 13:16:51 -05:00
xfs_alloc.h xfs: do not use emums for flags used in tracing 2010-07-26 13:16:43 -05:00
xfs_alloc_btree.c xfs: remove unneeded #include statements 2010-07-26 13:16:33 -05:00
xfs_alloc_btree.h
xfs_arch.h
xfs_attr.c xfs: remove unused delta tracking code in xfs_bmapi 2010-07-26 13:16:39 -05:00
xfs_attr.h xfs: convert attr to use unsigned names 2010-01-20 10:47:48 +11:00
xfs_attr_leaf.c xfs: remove unused delta tracking code in xfs_bmapi 2010-07-26 13:16:39 -05:00
xfs_attr_leaf.h
xfs_attr_sf.h xfs: convert attr to use unsigned names 2010-01-20 10:47:48 +11:00
xfs_bit.c
xfs_bit.h
xfs_bmap.c xfs: clean up xfs_bmap_get_bp 2010-07-26 13:16:53 -05:00
xfs_bmap.h xfs: remove unused delta tracking code in xfs_bmapi 2010-07-26 13:16:39 -05:00
xfs_bmap_btree.c xfs: remove unneeded #include statements 2010-07-26 13:16:33 -05:00
xfs_bmap_btree.h
xfs_btree.c xfs: remove unneeded #include statements 2010-07-26 13:16:33 -05:00
xfs_btree.h
xfs_btree_trace.c
xfs_btree_trace.h
xfs_buf_item.c xfs: kill the b_strat callback in xfs_buf 2010-07-26 13:16:52 -05:00
xfs_buf_item.h xfs: give li_cb callbacks the correct prototype 2010-07-26 13:16:35 -05:00
xfs_da_btree.c xfs: fix gcc 4.6 set but not read and unused statement warnings 2010-07-26 13:16:51 -05:00
xfs_da_btree.h xfs: convert dirnameops to unsigned char names 2010-01-20 10:47:17 +11:00
xfs_dfrag.c xfs: simplify inode to transaction joining 2010-07-26 13:16:36 -05:00
xfs_dfrag.h
xfs_dinode.h
xfs_dir2.c xfs: split xfs_itrace_entry 2010-07-26 13:16:44 -05:00
xfs_dir2.h xfs: make xfs_dir_cilookup_result use unsigned char 2010-01-20 10:47:25 +11:00
xfs_dir2_block.c xfs: fix gcc 4.6 set but not read and unused statement warnings 2010-07-26 13:16:51 -05:00
xfs_dir2_block.h
xfs_dir2_data.c xfs: remove unneeded #include statements 2010-07-26 13:16:33 -05:00
xfs_dir2_data.h
xfs_dir2_leaf.c xfs: remove unused delta tracking code in xfs_bmapi 2010-07-26 13:16:39 -05:00
xfs_dir2_leaf.h
xfs_dir2_node.c xfs: remove unneeded #include statements 2010-07-26 13:16:33 -05:00
xfs_dir2_node.h
xfs_dir2_sf.c xfs: remove unneeded #include statements 2010-07-26 13:16:33 -05:00
xfs_dir2_sf.h
xfs_error.c xfs: remove unneeded #include statements 2010-07-26 13:16:33 -05:00
xfs_error.h xfs: add const qualifiers to xfs error function args 2010-05-19 09:58:11 -05:00
xfs_extfree_item.c xfs: fix the xfs_log_iovec i_addr type 2010-07-26 13:16:36 -05:00
xfs_extfree_item.h
xfs_filestream.c xfs: clean up filestreams helpers 2010-07-26 13:16:51 -05:00
xfs_filestream.h xfs: clean up filestreams helpers 2010-07-26 13:16:51 -05:00
xfs_fs.h xfs: return inode fork offset in bulkstat for fsr 2010-03-05 11:02:07 -06:00
xfs_fsops.c xfs: simplify inode to transaction joining 2010-07-26 13:16:36 -05:00
xfs_fsops.h
xfs_ialloc.c xfs: remove unneeded #include statements 2010-07-26 13:16:33 -05:00
xfs_ialloc.h
xfs_ialloc_btree.c xfs: remove unneeded #include statements 2010-07-26 13:16:33 -05:00
xfs_ialloc_btree.h
xfs_iget.c xfs: fix gcc 4.6 set but not read and unused statement warnings 2010-07-26 13:16:51 -05:00
xfs_inode.c xfs: kill the b_strat callback in xfs_buf 2010-07-26 13:16:52 -05:00
xfs_inode.h xfs: simplify and remove xfs_ireclaim 2010-07-26 13:16:48 -05:00
xfs_inode_item.c xfs: fix big endian build 2010-07-26 16:07:38 -05:00
xfs_inode_item.h xfs: simplify inode to transaction joining 2010-07-26 13:16:36 -05:00
xfs_inum.h
xfs_iomap.c xfs: small cleanups for xfs_iomap / __xfs_get_blocks 2010-07-26 13:16:42 -05:00
xfs_iomap.h xfs: do not use emums for flags used in tracing 2010-07-26 13:16:43 -05:00
xfs_itable.c xfs: remove xfs_iput 2010-07-26 13:16:44 -05:00
xfs_itable.h xfs: remove block number from inode lookup code 2010-06-24 11:35:17 +10:00
xfs_log.c xfs: fix gcc 4.6 set but not read and unused statement warnings 2010-07-26 13:16:51 -05:00
xfs_log.h xfs: remove the unused XFS_LOG_SLEEP and XFS_LOG_NOSLEEP flags 2010-07-26 13:16:38 -05:00
xfs_log_cil.c xfs: fix the xfs_log_iovec i_addr type 2010-07-26 13:16:36 -05:00
xfs_log_priv.h xfs: enable background pushing of the CIL 2010-05-24 10:38:20 -05:00
xfs_log_recover.c xfs: fix the xfs_log_iovec i_addr type 2010-07-26 13:16:36 -05:00
xfs_log_recover.h xfs: Clean up XFS_BLI_* flag namespace 2010-05-24 10:33:39 -05:00
xfs_mount.c xfs: remove unneeded #include statements 2010-07-26 13:16:33 -05:00
xfs_mount.h xfs: remove obsolete osyncisosync mount option 2010-07-26 13:16:51 -05:00
xfs_mru_cache.c
xfs_mru_cache.h
xfs_quota.h xfs: removed unused XFS_QMOPT_ flags 2010-05-19 09:58:15 -05:00
xfs_refcache.h
xfs_rename.c xfs: split xfs_itrace_entry 2010-07-26 13:16:44 -05:00
xfs_rtalloc.c xfs: remove unused delta tracking code in xfs_bmapi 2010-07-26 13:16:39 -05:00
xfs_rtalloc.h xfs: be more explicit if RT mount fails due to config 2010-05-28 14:58:24 -05:00
xfs_rw.c xfs: remove unneeded #include statements 2010-07-26 13:16:33 -05:00
xfs_rw.h xfs: only clear the suid bit once in xfs_write 2010-02-12 13:43:57 -06:00
xfs_sb.h
xfs_trans.c xfs: fix xfs_trans_add_item() lockdep warnings 2010-07-26 13:16:49 -05:00
xfs_trans.h xfs: remove the unused XFS_TRANS_NOSLEEP/XFS_TRANS_WAIT flags 2010-07-26 13:16:38 -05:00
xfs_trans_ail.c xfs: drop dmapi hooks 2010-07-26 13:16:33 -05:00
xfs_trans_buf.c xfs: give li_cb callbacks the correct prototype 2010-07-26 13:16:35 -05:00
xfs_trans_extfree.c xfs: simplify log item descriptor tracking 2010-07-26 13:16:34 -05:00
xfs_trans_inode.c xfs: simplify inode to transaction joining 2010-07-26 13:16:36 -05:00
xfs_trans_priv.h xfs: simplify log item descriptor tracking 2010-07-26 13:16:34 -05:00
xfs_trans_space.h
xfs_types.h xfs: make the log ticket ID available outside the log infrastructure 2010-05-24 10:33:52 -05:00
xfs_utils.c xfs: simplify xfs_truncate_file 2010-07-26 13:16:52 -05:00
xfs_utils.h xfs: simplify xfs_truncate_file 2010-07-26 13:16:52 -05:00
xfs_vnodeops.c xfs: fix unsigned underflow in xfs_free_eofblocks 2010-07-26 13:16:50 -05:00
xfs_vnodeops.h xfs: kill xfs_lrw.h 2010-03-01 16:35:44 -06:00