Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-11 22:51:42 +00:00
Code Issues Packages Projects Releases Wiki Activity
6031e73a5b
linux/fs/xfs/libxfs
History
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
..
xfs_ag_resv.c xfs: simulate per-AG reservations being critically low 2016-10-05 16:26:31 -07:00
xfs_ag_resv.h xfs: set up per-AG free space reservations 2016-09-19 10:30:52 +10:00
xfs_alloc_btree.c xfs: make xfs btree stats less huge 2016-12-05 14:38:58 +11:00
xfs_alloc_btree.h
xfs_alloc.c xfs: forbid AG btrees with level == 0 2016-12-05 12:32:50 +11:00
xfs_alloc.h Merge branch 'xfs-4.9-log-recovery-fixes' into for-next 2016-10-03 09:56:28 +11:00
xfs_attr_leaf.c xfs: rename flist/free_list to dfops 2016-08-03 11:19:29 +10:00
xfs_attr_leaf.h xfs: several xattr functions can be void 2016-12-05 12:32:14 +11:00
xfs_attr_remote.c xfs: rename flist/free_list to dfops 2016-08-03 11:19:29 +10:00
xfs_attr_remote.h
xfs_attr_sf.h xfs: move struct xfs_attr_shortform to xfs_da_format.h 2016-02-08 15:00:01 +11:00
xfs_attr.c xfs: rename flist/free_list to dfops 2016-08-03 11:19:29 +10:00
xfs_bit.c libxfs: Optimize the loop for xfs_bitmap_empty 2016-01-04 16:10:19 +11:00
xfs_bit.h
xfs_bmap_btree.c xfs: make xfs btree stats less huge 2016-12-05 14:38:58 +11:00
xfs_bmap_btree.h
xfs_bmap.c xfs: error out if trying to add attrs and anextents > 0 2016-12-05 12:38:11 +11:00
xfs_bmap.h xfs: track preallocation separately in xfs_bmapi_reserve_delalloc() 2016-11-28 14:57:42 +11:00
xfs_btree.c xfs: check for bogus values in btree block headers 2016-12-05 12:33:54 +11:00
xfs_btree.h xfs: make xfs btree stats less huge 2016-12-05 14:38:58 +11:00
xfs_cksum.h xfs: optimise CRC updates 2016-12-05 14:40:32 +11:00
xfs_da_btree.c xfs: rename flist/free_list to dfops 2016-08-03 11:19:29 +10:00
xfs_da_btree.h xfs: rename flist/free_list to dfops 2016-08-03 11:19:29 +10:00
xfs_da_format.c xfs: kill xfs_dir2_inou_t 2016-07-20 11:48:31 +10:00
xfs_da_format.h xfs: fix attr shortform structure alignment on cris 2016-08-03 10:59:42 +10:00
xfs_defer.c xfs: defer should abort intent items if the trans roll fails 2016-10-24 14:21:18 +11:00
xfs_defer.h xfs: implement deferred bmbt map/unmap operations 2016-10-04 11:05:44 -07:00
xfs_dir2_block.c xfs: print name of verifier if it fails 2016-01-04 16:10:19 +11:00
xfs_dir2_data.c xfs: don't crash if reading a directory results in an unexpected hole 2016-12-05 12:37:47 +11:00
xfs_dir2_leaf.c xfs: print name of verifier if it fails 2016-01-04 16:10:19 +11:00
xfs_dir2_node.c xfs: always set rvalp in xfs_dir2_node_trim_free 2016-03-15 11:44:18 +11:00
xfs_dir2_priv.h xfs: move type conversion functions to xfs_dir.h 2014-12-04 09:43:17 +11:00
xfs_dir2_sf.c xfs: kill xfs_dir2_inou_t 2016-07-20 11:48:31 +10:00
xfs_dir2.c fs: xfs: libxfs: constify xfs_nameops structures 2016-11-28 14:57:42 +11:00
xfs_dir2.h xfs: rename flist/free_list to dfops 2016-08-03 11:19:29 +10:00
xfs_dquot_buf.c libxfs: clean up _calc_dquots_per_chunk 2016-10-20 15:46:18 +11:00
xfs_format.h libxfs: v3 inodes are only valid on crc-enabled filesystems 2016-10-20 15:48:38 +11:00
xfs_fs.h xfs: create a separate cow extent size hint for the allocator 2016-10-05 16:26:26 -07:00
xfs_ialloc_btree.c xfs: make xfs btree stats less huge 2016-12-05 14:38:58 +11:00
xfs_ialloc_btree.h xfs: allocate sparse inode chunks on full chunk allocation failure 2015-05-29 09:18:32 +10:00
xfs_ialloc.c xfs: forbid AG btrees with level == 0 2016-12-05 12:32:50 +11:00
xfs_ialloc.h xfs: rename flist/free_list to dfops 2016-08-03 11:19:29 +10:00
xfs_inode_buf.c xfs: optimise CRC updates 2016-12-05 14:40:32 +11:00
xfs_inode_buf.h libxfs: v3 inodes are only valid on crc-enabled filesystems 2016-10-20 15:48:38 +11:00
xfs_inode_fork.c xfs: new inode extent list lookup helpers 2016-11-24 11:39:32 +11:00
xfs_inode_fork.h xfs: new inode extent list lookup helpers 2016-11-24 11:39:32 +11:00
xfs_log_format.h xfs: add shared rmap map/unmap/convert log item types 2016-10-05 16:26:29 -07:00
xfs_log_recover.h xfs: support a crc verification only log record pass 2016-01-04 15:55:10 +11:00
xfs_log_rlimit.c xfs: move most of xfs_sb.h to xfs_format.h 2014-11-28 14:27:09 +11:00
xfs_quota_defs.h xfs: wire up Q_XGETNEXTQUOTA / get_nextdqblk 2016-02-08 11:27:38 +11:00
xfs_refcount_btree.c xfs: make xfs btree stats less huge 2016-12-05 14:38:58 +11:00
xfs_refcount_btree.h xfs: preallocate blocks for worst-case btree expansion 2016-10-05 16:26:27 -07:00
xfs_refcount.c xfs: rework refcount cow recovery error handling 2016-10-10 17:23:07 +11:00
xfs_refcount.h xfs: store in-progress CoW allocations in the refcount btree 2016-10-05 16:26:05 -07:00
xfs_rmap_btree.c xfs: make xfs btree stats less huge 2016-12-05 14:38:58 +11:00
xfs_rmap_btree.h xfs: preallocate blocks for worst-case btree expansion 2016-10-05 16:26:27 -07:00
xfs_rmap.c xfs: convert unwritten status of reverse mappings for shared files 2016-10-05 16:26:29 -07:00
xfs_rmap.h xfs: use interval query for rmap alloc operations on shared files 2016-10-05 16:26:29 -07:00
xfs_rtbitmap.c xfs: make several functions static 2016-06-01 17:38:15 +10:00
xfs_sb.c xfs: define the on-disk refcount btree format 2016-10-03 09:11:18 -07:00
xfs_sb.h xfs: remove unused function definitions 2016-02-08 14:58:07 +11:00
xfs_shared.h xfs: define the on-disk refcount btree format 2016-10-03 09:11:18 -07:00
xfs_symlink_remote.c xfs: print name of verifier if it fails 2016-01-04 16:10:19 +11:00
xfs_trans_resv.c xfs: increase log reservations for reflink 2016-10-05 16:26:29 -07:00
xfs_trans_resv.h xfs: increase log reservations for reflink 2016-10-05 16:26:29 -07:00
xfs_trans_space.h xfs: implement swapext for rmap filesystems 2016-10-05 16:26:32 -07:00
xfs_types.h xfs: remove NULLEXTNUM 2016-11-24 11:40:32 +11:00