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cae028df53
linux/fs/xfs
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Dave Chinner cae028df53 xfs: optimise CRC updates 
Nick Piggin reported that the CRC overhead in an fsync heavy
workload was higher than expected on a Power8 machine. Part of this
was to do with the fact that the power8 CRC implementation is not
efficient for CRC lengths of less than 512 bytes, and so the way we
split the CRCs over the CRC field means a lot of the CRCs are
reduced to being less than than optimal size.

To optimise this, change the CRC update mechanism to zero the CRC
field first, and then compute the CRC in one pass over the buffer
and write the result back into the buffer. We can do this safely
because anything writing a CRC has exclusive access to the buffer
the CRC is being calculated over.

We leave the CRC verify code the same - it still splits the CRC
calculation - because we do not want read-only operations modifying
the underlying buffer. This is because read-only operations may not
have an exclusive access to the buffer guaranteed, and so temporary
modifications could leak out to to other processes accessing the
buffer concurrently.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <david@fromorbit.com>
2016-12-05 14:40:32 +11:00
..
libxfs xfs: optimise CRC updates 2016-12-05 14:40:32 +11:00
Kconfig xfs: implement iomap based buffered write path 2016-06-21 09:53:44 +10:00
kmem.c xfs: improve kmem_realloc 2016-04-06 09:47:01 +10:00
kmem.h xfs: improve kmem_realloc 2016-04-06 09:47:01 +10:00
Makefile xfs: introduce the CoW fork 2016-10-04 18:06:40 -07:00
mrlock.h
uuid.c
uuid.h
xfs_acl.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-10-10 20:16:43 -07:00
xfs_acl.h xfs: Change how listxattr generates synthetic attributes 2015-12-06 21:34:16 -05:00
xfs_aops.c xfs: cleanup xfs_reflink_find_cow_mapping 2016-11-24 11:39:49 +11:00
xfs_aops.h xfs: allocate delayed extents in CoW fork 2016-10-04 18:06:41 -07:00
xfs_attr_inactive.c xfs: make several functions static 2016-06-01 17:38:15 +10:00
xfs_attr_list.c xfs: several xattr functions can be void 2016-12-05 12:32:14 +11:00
xfs_attr.h xfs: several xattr functions can be void 2016-12-05 12:32:14 +11:00
xfs_bmap_item.c xfs: when replaying bmap operations, don't let unlinked inodes get reaped 2016-10-04 11:05:44 -07:00
xfs_bmap_item.h xfs: log bmap intent items 2016-10-04 11:05:44 -07:00
xfs_bmap_util.c xfs: provide helper for counting extents from if_bytes 2016-11-08 12:59:42 +11:00
xfs_bmap_util.h xfs: change xfs_bmap_{finish,cancel,init,free} -> xfs_defer_* 2016-08-03 11:18:10 +10:00
xfs_buf_item.c xfs: normalize "infinite" retries in error configs 2016-09-14 07:51:30 +10:00
xfs_buf_item.h xfs: fix non-debug build warnings 2015-08-25 10:05:13 +10:00
xfs_buf.c xfs: prevent dropping ioend completions during buftarg wait 2016-08-26 16:01:59 +10:00
xfs_buf.h xfs: add XBF_XBF_NO_IOACCT to buf trace output 2016-11-28 14:57:42 +11:00
xfs_dir2_readdir.c xfs: return an error when an inline directory is too small 2016-10-03 09:11:15 -07:00
xfs_discard.c xfs: rmap btree requires more reserved free space 2016-08-03 11:38:24 +10:00
xfs_discard.h
xfs_dquot_item.c xfs: allocate log vector buffers outside CIL context lock 2016-07-22 09:52:35 +10:00
xfs_dquot_item.h
xfs_dquot.c xfs: rename flist/free_list to dfops 2016-08-03 11:19:29 +10:00
xfs_dquot.h xfs: fix implicit bool to int conversion 2015-01-09 10:48:58 +11:00
xfs_error.c Merge branch 'xfs-4.8-misc-fixes-3' into for-next 2016-07-20 11:51:08 +10:00
xfs_error.h xfs: simulate per-AG reservations being critically low 2016-10-05 16:26:31 -07:00
xfs_export.c xfs: abstract block export operations from nfsd layouts 2016-07-15 15:31:29 -04:00
xfs_export.h
xfs_extent_busy.c xfs: remote attribute blocks aren't really userdata 2016-09-26 08:21:28 +10:00
xfs_extent_busy.h
xfs_extfree_item.c xfs: remove unnecessary parentheses from log redo item recovery functions 2016-08-03 12:29:32 +10:00
xfs_extfree_item.h xfs: refactor redo intent item processing 2016-08-03 11:23:49 +10:00
xfs_file.c xfs: don't cap maximum dedupe request length 2016-12-05 12:38:57 +11:00
xfs_filestream.c Merge branch 'xfs-4.9-log-recovery-fixes' into for-next 2016-10-03 09:56:28 +11:00
xfs_filestream.h
xfs_fsops.c xfs: preallocate blocks for worst-case btree expansion 2016-10-05 16:26:27 -07:00
xfs_fsops.h xfs: preallocate blocks for worst-case btree expansion 2016-10-05 16:26:27 -07:00
xfs_globals.c xfs: garbage collect old cowextsz reservations 2016-10-05 16:26:28 -07:00
xfs_icache.c xfs: fix unbalanced inode reclaim flush locking 2016-11-10 08:23:22 +11:00
xfs_icache.h xfs: garbage collect old cowextsz reservations 2016-10-05 16:26:28 -07:00
xfs_icreate_item.c fs: xfs: xfs_icreate_item: constify xfs_item_ops structure 2016-11-28 14:57:42 +11:00
xfs_icreate_item.h
xfs_inode_item.c xfs: provide helper for counting extents from if_bytes 2016-11-08 12:59:42 +11:00
xfs_inode_item.h xfs: remove timestamps from incore inode 2016-02-09 16:54:58 +11:00
xfs_inode.c xfs: Move AGI buffer type setting to xfs_read_agi 2016-12-05 12:31:31 +11:00
xfs_inode.h xfs: fix unbalanced inode reclaim flush locking 2016-11-10 08:23:22 +11:00
xfs_ioctl32.c xfs: don't pass ioflags around in the ioctl path 2016-07-20 11:29:35 +10:00
xfs_ioctl32.h
xfs_ioctl.c xfs: provide helper for counting extents from if_bytes 2016-11-08 12:59:42 +11:00
xfs_ioctl.h xfs: don't pass ioflags around in the ioctl path 2016-07-20 11:29:35 +10:00
xfs_iomap.c xfs: pass post-eof speculative prealloc blocks to bmapi 2016-11-28 14:57:42 +11:00
xfs_iomap.h xfs: create a separate cow extent size hint for the allocator 2016-10-05 16:26:26 -07:00
xfs_iops.c xfs: reflink update for 4.9-rc1 2016-10-13 20:28:22 -07:00
xfs_iops.h xfs: Propagate dentry down to inode_change_ok() 2016-09-22 10:56:19 +02:00
xfs_itable.c xfs: create a separate cow extent size hint for the allocator 2016-10-05 16:26:26 -07:00
xfs_itable.h
xfs_linux.h xfs: garbage collect old cowextsz reservations 2016-10-05 16:26:28 -07:00
xfs_log_cil.c xfs: allocate log vector buffers outside CIL context lock 2016-07-22 09:52:35 +10:00
xfs_log_priv.h xfs: rework log recovery to submit buffers on LSN boundaries 2016-09-26 08:22:16 +10:00
xfs_log_recover.c xfs: optimise CRC updates 2016-12-05 14:40:32 +11:00
xfs_log.c xfs: optimise CRC updates 2016-12-05 14:40:32 +11:00
xfs_log.h xfs: make several functions static 2016-06-01 17:38:15 +10:00
xfs_message.c xfs: more info from kmem deadlocks and high-level error msgs 2015-10-12 16:04:45 +11:00
xfs_message.h
xfs_mount.c xfs: unset MS_ACTIVE if mount fails 2016-10-20 15:45:40 +11:00
xfs_mount.h xfs: garbage collect old cowextsz reservations 2016-10-05 16:26:28 -07:00
xfs_mru_cache.c xfs: xfs_mru_cache_insert() should use GFP_NOFS 2015-03-25 14:57:53 +11:00
xfs_mru_cache.h
xfs_ondisk.h xfs: define the on-disk refcount btree format 2016-10-03 09:11:18 -07:00
xfs_pnfs.c xfs: introduce refcount btree definitions 2016-10-03 09:11:16 -07:00
xfs_pnfs.h xfs: abstract block export operations from nfsd layouts 2016-07-15 15:31:29 -04:00
xfs_qm_bhv.c
xfs_qm_syscalls.c xfs: better xfs_trans_alloc interface 2016-04-06 09:19:55 +10:00
xfs_qm.c xfs: provide helper for counting extents from if_bytes 2016-11-08 12:59:42 +11:00
xfs_qm.h xfs: Split default quota limits by quota type 2016-02-08 11:27:55 +11:00
xfs_quota.h xfs: fix quota block reservation leak when tp allocates and frees blocks 2015-06-01 07:15:37 +10:00
xfs_quotaops.c xfs: wire up Q_XGETNEXTQUOTA / get_nextdqblk 2016-02-08 11:27:38 +11:00
xfs_refcount_item.c xfs: store in-progress CoW allocations in the refcount btree 2016-10-05 16:26:05 -07:00
xfs_refcount_item.h xfs: log refcount intent items 2016-10-03 09:11:21 -07:00
xfs_reflink.c xfs: clean up cow fork reservation and tag inodes correctly 2016-11-28 14:57:42 +11:00
xfs_reflink.h xfs: use new extent lookup helpers in xfs_reflink_trim_irec_to_next_cow 2016-11-24 11:39:50 +11:00
xfs_rmap_item.c xfs: convert unwritten status of reverse mappings for shared files 2016-10-05 16:26:29 -07:00
xfs_rmap_item.h xfs: convert RUI log formats to use variable length arrays 2016-09-19 10:24:27 +10:00
xfs_rtalloc.c xfs: rename flist/free_list to dfops 2016-08-03 11:19:29 +10:00
xfs_rtalloc.h xfs: make several functions static 2016-06-01 17:38:15 +10:00
xfs_stats.c xfs: make xfs btree stats less huge 2016-12-05 14:38:58 +11:00
xfs_stats.h xfs: make xfs btree stats less huge 2016-12-05 14:38:58 +11:00
xfs_super.c xfs: check inode reflink flag before calling reflink functions 2016-10-10 16:47:32 +11:00
xfs_super.h xfs: quiesce the filesystem after recovery on readonly mount 2016-09-26 08:21:44 +10:00
xfs_symlink.c xfs: rename flist/free_list to dfops 2016-08-03 11:19:29 +10:00
xfs_symlink.h
xfs_sysctl.c xfs: garbage collect old cowextsz reservations 2016-10-05 16:26:28 -07:00
xfs_sysctl.h xfs: garbage collect old cowextsz reservations 2016-10-05 16:26:28 -07:00
xfs_sysfs.c xfs: add some 'static' annotations 2016-10-20 15:42:30 +11:00
xfs_sysfs.h xfs: configurable error behavior via sysfs 2016-05-18 10:58:51 +10:00
xfs_trace.c xfs: rework xfs_bmap_free callers to use xfs_defer_ops 2016-08-03 11:15:38 +10:00
xfs_trace.h xfs: optimize xfs_reflink_end_cow 2016-10-20 15:54:45 +11:00
xfs_trans_ail.c xfs: Make xfsaild freezeable again 2016-02-08 14:59:07 +11:00
xfs_trans_bmap.c xfs: implement deferred bmbt map/unmap operations 2016-10-04 11:05:44 -07:00
xfs_trans_buf.c xfs: remove XBF_STALE flag wrapper macros 2016-02-10 15:01:11 +11:00
xfs_trans_dquot.c xfs: Split default quota limits by quota type 2016-02-08 11:27:55 +11:00
xfs_trans_extfree.c xfs: set up per-AG free space reservations 2016-09-19 10:30:52 +10:00
xfs_trans_inode.c fs: Replace current_fs_time() with current_time() 2016-09-27 21:06:22 -04:00
xfs_trans_priv.h xfs: add helper to conditionally remove items from the AIL 2015-08-19 10:01:08 +10:00
xfs_trans_refcount.c xfs: connect refcount adjust functions to upper layers 2016-10-03 09:11:22 -07:00
xfs_trans_rmap.c xfs: add shared rmap map/unmap/convert log item types 2016-10-05 16:26:29 -07:00
xfs_trans.c Merge branch 'xfs-4.9-reflink-prep' into for-next 2016-10-03 09:52:31 +11:00
xfs_trans.h xfs: implement deferred bmbt map/unmap operations 2016-10-04 11:05:44 -07:00
xfs_xattr.c xfs: several xattr functions can be void 2016-12-05 12:32:14 +11:00
xfs.h