Dave Chinner a44f13edf0 xfs: Reduce log force overhead for delayed logging ... Delayed logging adds some serialisation to the log force process to ensure that it does not deference a bad commit context structure when determining if a CIL push is necessary or not. It does this by grabing the CIL context lock exclusively, then dropping it before pushing the CIL if necessary. This causes serialisation of all log forces and pushes regardless of whether a force is necessary or not. As a result fsync heavy workloads (like dbench) can be significantly slower with delayed logging than without. To avoid this penalty, copy the current sequence from the context to the CIL structure when they are swapped. This allows us to do unlocked checks on the current sequence without having to worry about dereferencing context structures that may have already been freed. Hence we can remove the CIL context locking in the forcing code and only call into the push code if the current context matches the sequence we need to force. By passing the sequence into the push code, we can check the sequence again once we have the CIL lock held exclusive and abort if the sequence has already been pushed. This avoids a lock round-trip and unnecessary CIL pushes when we have racing push calls. The result is that the regression in dbench performance goes away - this change improves dbench performance on a ramdisk from ~2100MB/s to ~2500MB/s. This compares favourably to not using delayed logging which retuns ~2500MB/s for the same workload. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de>		2010-08-24 11:40:03 +10:00
..
linux-2.6	xfs: dummy transactions should not dirty VFS state	2010-08-24 11:46:31 +10:00
quota	Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6	2010-08-07 12:57:07 -07:00
support	xfs: drop dmapi hooks	2010-07-26 13:16:33 -05:00
Kconfig	xfs: use generic Posix ACL code	2009-06-10 17:07:47 +02:00
Makefile	xfs: simplify log item descriptor tracking	2010-07-26 13:16:34 -05:00
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_btree.c	xfs: remove unneeded #include statements	2010-07-26 13:16:33 -05:00
xfs_alloc_btree.h
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_arch.h	xfs: use generic Posix ACL code	2009-06-10 17:07:47 +02:00
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_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_bit.c
xfs_bit.h
xfs_bmap_btree.c	xfs: remove unneeded #include statements	2010-07-26 13:16:33 -05:00
xfs_bmap_btree.h	xfs: make several more functions static	2010-01-15 15:31:38 -06:00
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_btree_trace.c
xfs_btree_trace.h	xfs: event tracing support	2009-12-14 23:08:16 -06:00
xfs_btree.c	xfs: remove unneeded #include statements	2010-07-26 13:16:33 -05:00
xfs_btree.h	xfs: add more statics & drop some unused functions	2009-08-31 14:46:20 -05:00
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: clean up inconsistent variable naming in xfs_swap_extent	2010-01-15 15:31:23 -06:00
xfs_dinode.h	xfs: remove m_litino	2009-03-29 09:51:14 +02:00
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: fix various typos	2009-03-29 09:55:42 +02:00
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: make several more functions static	2010-01-15 15:31:38 -06:00
xfs_dir2_sf.c	xfs: remove unneeded #include statements	2010-07-26 13:16:33 -05:00
xfs_dir2_sf.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_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: dummy transactions should not dirty VFS state	2010-08-24 11:46:31 +10:00
xfs_fsops.h	xfs: dummy transactions should not dirty VFS state	2010-08-24 11:46:31 +10:00
xfs_ialloc_btree.c	xfs: remove unneeded #include statements	2010-07-26 13:16:33 -05:00
xfs_ialloc_btree.h	xfs: remove superflous inobt macros	2009-02-09 08:37:14 +01:00
xfs_ialloc.c	xfs: fix untrusted inode number lookup	2010-08-24 11:42:30 +10:00
xfs_ialloc.h	xfs: rationalize xfs_inobt_lookup*	2009-09-01 12:45:39 -05:00
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_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_inode.c	xfs: ensure we mark all inodes in a freed cluster XFS_ISTALE	2010-08-24 11:42:41 +10:00
xfs_inode.h	xfs: simplify and remove xfs_ireclaim	2010-07-26 13:16:48 -05:00
xfs_inum.h	xfs: remove XFS_INO64_OFFSET	2009-08-31 14:46:22 -05:00
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_cil.c	xfs: Reduce log force overhead for delayed logging	2010-08-24 11:40:03 +10:00
xfs_log_priv.h	xfs: Reduce log force overhead for delayed logging	2010-08-24 11:40:03 +10:00
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_log.c	xfs: Reduce log force overhead for delayed logging	2010-08-24 11:40:03 +10:00
xfs_log.h	xfs: remove the unused XFS_LOG_SLEEP and XFS_LOG_NOSLEEP flags	2010-07-26 13:16:38 -05:00
xfs_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: Kill filestreams cache flush	2010-01-15 15:34:22 -06:00
xfs_mru_cache.h	xfs: Kill filestreams cache flush	2010-01-15 15:34:22 -06:00
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_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: unlock items before allowing the CIL to commit	2010-08-24 11:42:52 +10:00
xfs_trans_space.h	xfs: remove superflous inobt macros	2009-02-09 08:37:14 +01:00
xfs_trans.c	xfs: unlock items before allowing the CIL to commit	2010-08-24 11:42:52 +10:00
xfs_trans.h	xfs: remove the unused XFS_TRANS_NOSLEEP/XFS_TRANS_WAIT flags	2010-07-26 13:16:38 -05:00
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: new truncate sequence	2010-08-09 16:47:42 -04:00
xfs_vnodeops.h	xfs: kill xfs_lrw.h	2010-03-01 16:35:44 -06:00
xfs.h	xfs: event tracing support	2009-12-14 23:08:16 -06:00