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Hisashi Hifumi bddaafa11a xfs: pagecache usage optimization 
Hi.

I introduced "is_partially_uptodate" aops for XFS.

A page can have multiple buffers and even if a page is not uptodate,
some buffers can be uptodate on pagesize != blocksize environment.

This aops checks that all buffers which correspond to a part of a file
that we want to read are uptodate. If so, we do not have to issue actual
read IO to HDD even if a page is not uptodate because the portion we
want to read are uptodate.

"block_is_partially_uptodate" function is already used by ext2/3/4.
With the following patch random read/write mixed workloads or random read
after random write workloads can be optimized and we can get performance
improvement.

I did a performance test using the sysbench.

#sysbench --num-threads=4 --max-requests=100000 --test=fileio --file-num=1 \
--file-block-size=8K --file-total-size=1G --file-test-mode=rndrw \
--file-fsync-freq=0 --file-rw-ratio=0.5 run

-2.6.29-rc6
Test execution summary:
    total time:                          123.8645s
    total number of events:              100000
    total time taken by event execution: 442.4994
    per-request statistics:
         min:                            0.0000s
         avg:                            0.0044s
         max:                            0.3387s
         approx.  95 percentile:         0.0118s

-2.6.29-rc6-patched
Test execution summary:
    total time:                          108.0757s
    total number of events:              100000
    total time taken by event execution: 417.7505
    per-request statistics:
         min:                            0.0000s
         avg:                            0.0042s
         max:                            0.3217s
         approx.  95 percentile:         0.0118s

arch: ia64
pagesize: 16k
blocksize: 4k

Signed-off-by: Hisashi Hifumi <hifumi.hisashi@oss.ntt.co.jp>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Felix Blyakher <felixb@sgi.com>
 		2009-03-29 09:53:38 +02:00
..
linux-2.6 xfs: pagecache usage optimization 2009-03-29 09:53:38 +02:00
quota xfs: kill mutex_t typedef 2009-03-29 09:51:00 +02:00
support Fix xfs debug build breakage by pushing xfs_error.h after 2009-03-15 08:10:25 -05:00
Kconfig xfs: fix dentry aliasing issues in open_by_handle 2009-01-19 02:02:57 +01:00
Makefile xfs: get rid of indirections in the quotaops implementation 2009-02-09 08:47:34 +01:00
xfs.h [XFS] make btree tracing generic 2008-10-30 16:55:13 +11:00
xfs_acl.c CRED: Wrap task credential accesses in the XFS filesystem 2008-11-14 10:39:04 +11:00
xfs_acl.h [XFS] Remove several unused typedefs. 2009-01-09 15:46:16 +11:00
xfs_ag.h xfs: remove uchar_t/ushort_t/uint_t/ulong_t types 2009-02-09 08:37:39 +01:00
xfs_alloc.c xfs: factor out code to find the longest free extent in the AG 2009-03-16 08:29:46 +01:00
xfs_alloc.h xfs: factor out code to find the longest free extent in the AG 2009-03-16 08:29:46 +01:00
xfs_alloc_btree.c [XFS] Remove the rest of the macro-to-function indirections. 2009-01-16 17:10:42 +11:00
xfs_alloc_btree.h [XFS] Always use struct xfs_btree_block instead of short / longform 2008-10-30 17:14:34 +11:00
xfs_arch.h [XFS] Sync up kernel and user-space headers 2008-10-30 17:05:38 +11:00
xfs_attr.c [XFS] Remove the rest of the macro-to-function indirections. 2009-01-16 17:10:42 +11:00
xfs_attr.h [XFS] Move attr log alloc size calculator to another function. 2008-08-13 16:03:35 +10:00
xfs_attr_leaf.c xfs: factor out attr fork reset handling 2009-02-04 09:36:00 +01:00
xfs_attr_leaf.h [XFS] Remove macro-to-function indirections in attr code 2009-01-09 15:46:44 +11:00
xfs_attr_sf.h [XFS] 2008-07-28 16:58:35 +10:00
xfs_bit.c [XFS] Use the generic bitops rather than implementing them ourselves. 2008-08-13 15:41:12 +10:00
xfs_bit.h [XFS] Remove macro-to-function indirections in the mask code 2009-01-09 15:53:54 +11:00
xfs_bmap.c xfs: factor out code to find the longest free extent in the AG 2009-03-16 08:29:46 +01:00
xfs_bmap.h [XFS] Remove the rest of the macro-to-function indirections. 2009-01-16 17:10:42 +11:00
xfs_bmap_btree.c [XFS] Remove the rest of the macro-to-function indirections. 2009-01-16 17:10:42 +11:00
xfs_bmap_btree.h [XFS] Remove the rest of the macro-to-function indirections. 2009-01-16 17:10:42 +11:00
xfs_btree.c Long btree pointers are still 64 bit on disk 2009-01-21 18:33:46 -06:00
xfs_btree.h [XFS] Always use struct xfs_btree_block instead of short / longform 2008-10-30 17:14:34 +11:00
xfs_btree_trace.c [XFS] make btree tracing generic 2008-10-30 16:58:50 +11:00
xfs_btree_trace.h [XFS] make btree tracing generic 2008-10-30 16:58:50 +11:00
xfs_buf_item.c [XFS] Remove XFS_BUF_SHUT() and friends 2008-12-22 17:52:58 +11:00
xfs_buf_item.h [XFS] Fix up sparse warnings. 2008-02-07 18:14:38 +11:00
xfs_da_btree.c xfs: remove uchar_t/ushort_t/uint_t/ulong_t types 2009-02-09 08:37:39 +01:00
xfs_da_btree.h xfs: move declaration to header file 2009-03-06 17:20:15 -06:00
xfs_dfrag.c xfs: reject swapext ioctl on swapfiles 2009-02-12 19:56:00 +01:00
xfs_dfrag.h [XFS] Move copy_from_user calls out of ioctl helpers into ioctl switch. 2008-12-02 17:08:01 +11:00
xfs_dinode.h xfs: remove m_litino 2009-03-29 09:51:14 +02:00
xfs_dir2.c xfs: move declaration to header file 2009-03-06 17:20:15 -06:00
xfs_dir2.h [XFS] Return case-insensitive match for dentry cache 2008-07-28 16:58:40 +10:00
xfs_dir2_block.c xfs: kill ino64 mount option 2009-03-29 09:51:08 +02:00
xfs_dir2_block.h [XFS] use filldir internally 2007-10-15 16:49:49 +10:00
xfs_dir2_data.c [XFS] Name operation vector for hash and compare 2008-07-28 16:58:36 +10:00
xfs_dir2_data.h [XFS] Reduce shouting by removing unnecessary macros from dir2 code. 2007-07-14 15:37:02 +10:00
xfs_dir2_leaf.c xfs: kill ino64 mount option 2009-03-29 09:51:08 +02:00
xfs_dir2_leaf.h [XFS] use filldir internally 2007-10-15 16:49:49 +10:00
xfs_dir2_node.c [XFS] Fix returning case-preserved name with CI node form directories 2008-07-28 16:59:01 +10:00
xfs_dir2_node.h [XFS] Reduce shouting by removing unnecessary macros from dir2 code. 2007-07-14 15:37:02 +10:00
xfs_dir2_sf.c xfs: kill ino64 mount option 2009-03-29 09:51:08 +02:00
xfs_dir2_sf.h [XFS] kill xfs_dinode_core_t 2008-12-01 11:37:35 +11:00
xfs_dir2_trace.c [XFS] Add op_flags field and helpers to xfs_da_args 2008-07-28 16:58:37 +10:00
xfs_dir2_trace.h
…
xfs_dmapi.h removed unused #include <linux/version.h>'s 2008-08-23 12:14:12 -07:00
xfs_dmops.c [XFS] kill struct xfs_mount_args 2008-10-30 17:53:24 +11:00
xfs_error.c [XFS] avoid memory allocations in xfs_fs_vcmn_err 2008-12-22 18:02:01 +11:00
xfs_error.h [XFS] avoid memory allocations in xfs_fs_vcmn_err 2008-12-22 18:02:01 +11:00
xfs_extfree_item.c [XFS] Finish removing the mount pointer from the AIL API 2008-10-30 17:39:58 +11:00
xfs_extfree_item.h [XFS] remove always-true #ifndef HAVE_FORMAT32 tests 2009-01-22 14:07:31 +11:00
xfs_filestream.c xfs: factor out code to find the longest free extent in the AG 2009-03-16 08:29:46 +01:00
xfs_filestream.h [XFS] Concurrent Multi-File Data Streams 2007-07-14 15:40:53 +10:00
xfs_fs.h filesystem freeze: remove XFS specific ioctl interfaces for freeze feature 2009-01-09 16:54:42 -08:00
xfs_fsops.c filesystem freeze: add error handling of write_super_lockfs/unlockfs 2009-01-09 16:54:42 -08:00
xfs_fsops.h filesystem freeze: add error handling of write_super_lockfs/unlockfs 2009-01-09 16:54:42 -08:00
xfs_ialloc.c xfs: remove superflous inobt macros 2009-02-09 08:37:14 +01:00
xfs_ialloc.h [XFS] Remove the rest of the macro-to-function indirections. 2009-01-16 17:10:42 +11:00
xfs_ialloc_btree.c [XFS] Always use struct xfs_btree_block instead of short / longform 2008-10-30 17:14:34 +11:00
xfs_ialloc_btree.h xfs: remove superflous inobt macros 2009-02-09 08:37:14 +01:00
xfs_iget.c xfs: prevent lockdep false positive in xfs_iget_cache_miss 2009-03-04 07:31:48 -06:00
xfs_inode.c xfs: sanity check attr fork size 2009-01-19 02:04:16 +01:00
xfs_inode.h [XFS] Fix merge failures 2008-12-29 16:47:18 +11:00
xfs_inode_item.c [XFS] embededd struct xfs_imap into xfs_inode 2008-12-01 11:38:08 +11:00
xfs_inode_item.h [XFS] remove always-true #ifndef HAVE_FORMAT32 tests 2009-01-22 14:07:31 +11:00
xfs_inum.h
…
xfs_iomap.c [XFS] Remove the rest of the macro-to-function indirections. 2009-01-16 17:10:42 +11:00
xfs_iomap.h [XFS] kill unnessecary ioops indirection 2008-02-07 16:44:14 +11:00
xfs_itable.c xfs: kill vn_atime_* helpers. 2009-03-16 08:24:46 +01:00
xfs_itable.h [XFS] Fix xfs_bulkstat_one size checks & error handling 2008-12-02 17:16:03 +11:00
xfs_log.c xfs: cleanup log unmount handling 2009-03-16 08:19:29 +01:00
xfs_log.h xfs: cleanup log unmount handling 2009-03-16 08:19:29 +01:00
xfs_log_priv.h xfs: cleanup xlog_bread 2009-03-16 08:24:13 +01:00
xfs_log_recover.c xfs: cleanup xlog_bread 2009-03-16 08:24:13 +01:00
xfs_log_recover.h
…
xfs_mount.c xfs: remove m_litino 2009-03-29 09:51:14 +02:00
xfs_mount.h xfs: remove m_litino 2009-03-29 09:51:14 +02:00
xfs_mru_cache.c [XFS] streamline init/exit path 2008-07-28 16:59:25 +10:00
xfs_mru_cache.h [XFS] On-demand reaping of the MRU cache 2007-09-17 16:42:02 +10:00
xfs_qmops.c xfs: get rid of indirections in the quotaops implementation 2009-02-09 08:47:34 +01:00
xfs_quota.h xfs: get rid of indirections in the quotaops implementation 2009-02-09 08:47:34 +01:00
xfs_refcache.h
…
xfs_rename.c [XFS] Remove the rest of the macro-to-function indirections. 2009-01-16 17:10:42 +11:00
xfs_rtalloc.c xfs: make sure to free the real-time inodes in the mount error path 2009-02-04 09:33:58 +01:00
xfs_rtalloc.h xfs: make sure to free the real-time inodes in the mount error path 2009-02-04 09:33:58 +01:00
xfs_rw.c [XFS] replace b_fspriv with b_mount 2008-12-11 13:13:33 +11:00
xfs_rw.h [XFS] Remove the rest of the macro-to-function indirections. 2009-01-16 17:10:42 +11:00
xfs_sb.h [XFS] Remove the rest of the macro-to-function indirections. 2009-01-16 17:10:42 +11:00
xfs_trans.c [XFS] Fix double free of log tickets 2008-11-17 17:37:10 +11:00
xfs_trans.h xfs: remove superflous inobt macros 2009-02-09 08:37:14 +01:00
xfs_trans_ail.c [XFS] correctly select first log item to push 2008-10-30 18:26:51 +11:00
xfs_trans_buf.c [XFS] Finish removing the mount pointer from the AIL API 2008-10-30 17:39:58 +11:00
xfs_trans_extfree.c [XFS] Radix tree based inode caching 2007-10-15 16:50:50 +10:00
xfs_trans_inode.c use xfs_trans_ijoin in xfs_trans_iget 2008-12-04 15:39:23 +11:00
xfs_trans_item.c [XFS] Add ail pointer into log items 2008-10-30 17:39:46 +11:00
xfs_trans_priv.h [XFS] Finish removing the mount pointer from the AIL API 2008-10-30 17:39:58 +11:00
xfs_trans_space.h xfs: remove superflous inobt macros 2009-02-09 08:37:14 +01:00
xfs_types.h xfs: remove uchar_t/ushort_t/uint_t/ulong_t types 2009-02-09 08:37:39 +01:00
xfs_utils.c [XFS] kill XFS_DINODE_VERSION_ defines 2008-12-01 11:37:42 +11:00
xfs_utils.h [XFS] implement IHOLD/IRELE directly 2008-08-13 16:13:45 +10:00
xfs_vnodeops.c xfs: kill VN_BAD 2009-03-16 08:25:25 +01:00
xfs_vnodeops.h xfs: merge xfs_mkdir into xfs_create 2009-02-09 08:38:02 +01:00