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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.h xfs: event tracing support 2009-12-14 23:08:16 -06:00
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.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: use generic Posix ACL code 2009-06-10 17:07:47 +02:00
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_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: make several more functions static 2010-01-15 15:31:38 -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_btree_trace.c
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xfs_btree_trace.h xfs: event tracing support 2009-12-14 23:08:16 -06:00
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.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
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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
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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
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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
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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.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_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_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: 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_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: 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.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_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_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
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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
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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_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_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