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linux/fs/xfs/libxfs
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Chi Zhiling 3ef2268403 xfs: Reduce unnecessary searches when searching for the best extents 
Recently, we found that the CPU spent a lot of time in
xfs_alloc_ag_vextent_size when the filesystem has millions of fragmented
spaces.

The reason is that we conducted much extra searching for extents that
could not yield a better result, and these searches would cost a lot of
time when there were millions of extents to search through. Even if we
get the same result length, we don't switch our choice to the new one,
so we can definitely terminate the search early.

Since the result length cannot exceed the found length, when the found
length equals the best result length we already have, we can conclude
the search.

We did a test in that filesystem:
[root@localhost ~]# xfs_db -c freesp /dev/vdb
   from      to extents  blocks    pct
      1       1     215     215   0.01
      2       3  994476 1988952  99.99

Before this patch:
 0)               |  xfs_alloc_ag_vextent_size [xfs]() {
 0) * 15597.94 us |  }

After this patch:
 0)               |  xfs_alloc_ag_vextent_size [xfs]() {
 0)   19.176 us    |  }

Signed-off-by: Chi Zhiling <chizhiling@kylinos.cn>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Carlos Maiolino <cem@kernel.org>
2024-10-30 11:27:18 +01:00
..
xfs_ag_resv.c xfs: split xfs_mod_freecounter 2024-04-22 18:00:47 +05:30
xfs_ag_resv.h xfs: get rid of xfs_ag_resv_rmapbt_alloc 2024-07-04 14:36:13 +05:30
xfs_ag.c xfs: update the pag for the last AG at recovery time 2024-10-22 13:37:19 +02:00
xfs_ag.h xfs: update the pag for the last AG at recovery time 2024-10-22 13:37:19 +02:00
xfs_alloc_btree.c xfs: standardize the btree maxrecs function parameters 2024-09-01 08:58:20 -07:00
xfs_alloc_btree.h xfs: standardize the btree maxrecs function parameters 2024-09-01 08:58:20 -07:00
xfs_alloc.c xfs: Reduce unnecessary searches when searching for the best extents 2024-10-30 11:27:18 +01:00
xfs_alloc.h xfs: don't ifdef around the exact minlen allocations 2024-10-07 08:00:11 +02:00
xfs_attr_leaf.c xfs: distinguish extra split from real ENOSPC from xfs_attr3_leaf_split 2024-10-07 08:00:11 +02:00
xfs_attr_leaf.h xfs: return bool from xfs_attr3_leaf_add 2024-10-07 08:00:11 +02:00
xfs_attr_remote.c xfs: minor cleanups of xfs_attr3_rmt_blocks 2024-05-02 07:48:37 -07:00
xfs_attr_remote.h xfs: create a helper to compute the blockcount of a max sized remote value 2024-05-02 07:48:36 -07:00
xfs_attr_sf.h xfs: pass the attr value to put_listent when possible 2024-04-23 07:47:00 -07:00
xfs_attr.c xfs: distinguish extra split from real ENOSPC from xfs_attr_node_try_addname 2024-10-07 08:00:11 +02:00
xfs_attr.h xfs: fix xfs_init_attr_trans not handling explicit operation codes 2024-05-27 15:55:52 +05:30
xfs_bit.c
xfs_bit.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_bmap_btree.c xfs: standardize the btree maxrecs function parameters 2024-09-01 08:58:20 -07:00
xfs_bmap_btree.h xfs: standardize the btree maxrecs function parameters 2024-09-01 08:58:20 -07:00
xfs_bmap.c xfs: support lowmode allocations in xfs_bmap_exact_minlen_extent_alloc 2024-10-07 08:00:12 +02:00
xfs_bmap.h xfs: hoist extent size helpers to libxfs 2024-07-02 11:36:55 -07:00
xfs_btree_mem.c xfs: launder in-memory btree buffers before transaction commit 2024-02-22 12:43:36 -08:00
xfs_btree_mem.h xfs: launder in-memory btree buffers before transaction commit 2024-02-22 12:43:36 -08:00
xfs_btree_staging.c xfs: xfs_btree_bload_prep_block() should use __GFP_NOFAIL 2024-02-28 14:04:30 +05:30
xfs_btree_staging.h xfs: don't override bc_ops for staging btrees 2024-02-22 12:37:35 -08:00
xfs_btree.c xfs: Avoid races with cnt_btree lastrec updates 2024-07-04 12:44:16 +05:30
xfs_btree.h xfs: Avoid races with cnt_btree lastrec updates 2024-07-04 12:44:16 +05:30
xfs_cksum.h
xfs_da_btree.c xfs: distinguish extra split from real ENOSPC from xfs_attr3_leaf_split 2024-10-07 08:00:11 +02:00
xfs_da_btree.h xfs: create attr log item opcodes and formats for parent pointers 2024-04-23 07:46:57 -07:00
xfs_da_format.h xfs: turn XFS_ATTR3_RMT_BUF_SPACE into a function 2024-05-02 07:48:36 -07:00
xfs_defer.c xfs: Remove duplicate xfs_trans_priv.h header 2024-09-03 10:07:41 +05:30
xfs_defer.h xfs: Increase XFS_DEFER_OPS_NR_INODES to 5 2024-04-15 14:59:01 -07:00
xfs_dir2_block.c xfs: validate explicit directory block buffer owners 2024-04-15 14:58:52 -07:00
xfs_dir2_data.c xfs: don't walk off the end of a directory data block 2024-07-01 09:32:29 +05:30
xfs_dir2_leaf.c xfs: validate explicit directory free block owners 2024-04-15 14:58:52 -07:00
xfs_dir2_node.c xfs: validate explicit directory free block owners 2024-04-15 14:58:52 -07:00
xfs_dir2_priv.h xfs: don't walk off the end of a directory data block 2024-07-01 09:32:29 +05:30
xfs_dir2_sf.c xfs: convert remaining kmem_free() to kfree() 2024-02-13 18:07:34 +05:30
xfs_dir2.c xfs: move dirent update hooks to xfs_dir2.c 2024-07-02 11:37:00 -07:00
xfs_dir2.h xfs: move dirent update hooks to xfs_dir2.c 2024-07-02 11:37:00 -07:00
xfs_dquot_buf.c xfs: remove the xfs_dqblk_t typedef 2021-10-14 09:19:33 -07:00
xfs_errortag.h xfs: add error injection to test file mapping exchange recovery 2024-04-15 14:54:19 -07:00
xfs_exchmaps.c xfs: refactor dir format helpers 2024-04-26 11:21:46 +05:30
xfs_exchmaps.h xfs: use atomic extent swapping to fix user file fork data 2024-04-15 14:58:53 -07:00
xfs_format.h xfs: don't use the incore struct xfs_sb for offsets into struct xfs_dsb 2024-07-02 11:37:00 -07:00
xfs_fs.h xfs: fix C++ compilation errors in xfs_fs.h 2024-09-01 08:58:20 -07:00
xfs_health.h xfs: report directory tree corruption in the health information 2024-04-23 16:55:17 -07:00
xfs_ialloc_btree.c xfs: standardize the btree maxrecs function parameters 2024-09-01 08:58:20 -07:00
xfs_ialloc_btree.h xfs: standardize the btree maxrecs function parameters 2024-09-01 08:58:20 -07:00
xfs_ialloc.c vfs-6.12.blocksize 2024-09-20 17:53:17 -07:00
xfs_ialloc.h xfs: pass the icreate args object to xfs_dialloc 2024-09-01 08:58:19 -07:00
xfs_iext_tree.c xfs: use __GFP_NOLOCKDEP instead of GFP_NOFS 2024-02-13 18:07:34 +05:30
xfs_inode_buf.c xfs: fix di_onlink checking for V1/V2 inodes 2024-08-26 09:50:41 +05:30
xfs_inode_buf.h xfs: kill xfs_sb_version_has_v3inode() 2021-08-19 10:07:14 -07:00
xfs_inode_fork.c xfs: standardize the btree maxrecs function parameters 2024-09-01 08:58:20 -07:00
xfs_inode_fork.h xfs: simplify iext overflow checking and upgrade 2024-05-03 11:20:06 +05:30
xfs_inode_util.c xfs: remove unnecessary check 2024-09-03 10:07:40 +05:30
xfs_inode_util.h xfs: hoist inode free function to libxfs 2024-07-02 11:36:59 -07:00
xfs_log_format.h xfs: record inode generation in xattr update log intent items 2024-04-23 07:46:57 -07:00
xfs_log_recover.h xfs: capture inode generation numbers in the ondisk exchmaps log item 2024-04-15 14:54:24 -07:00
xfs_log_rlimit.c xfs: drop compatibility minimum log size computations for reflink 2024-04-23 07:47:01 -07:00
xfs_ondisk.h xfs: don't use the incore struct xfs_sb for offsets into struct xfs_dsb 2024-07-02 11:37:00 -07:00
xfs_parent.c xfs: add raw parent pointer apis to support repair 2024-04-23 07:47:04 -07:00
xfs_parent.h xfs: add raw parent pointer apis to support repair 2024-04-23 07:47:04 -07:00
xfs_quota_defs.h xfs: remove unused parameter in macro XFS_DQUOT_LOGRES 2024-07-29 09:29:31 +05:30
xfs_refcount_btree.c xfs: standardize the btree maxrecs function parameters 2024-09-01 08:58:20 -07:00
xfs_refcount_btree.h xfs: standardize the btree maxrecs function parameters 2024-09-01 08:58:20 -07:00
xfs_refcount.c xfs: move xfs_refcount_update_defer_add to xfs_refcount_item.c 2024-07-02 11:37:07 -07:00
xfs_refcount.h xfs: move xfs_refcount_update_defer_add to xfs_refcount_item.c 2024-07-02 11:37:07 -07:00
xfs_rmap_btree.c xfs: standardize the btree maxrecs function parameters 2024-09-01 08:58:20 -07:00
xfs_rmap_btree.h xfs: standardize the btree maxrecs function parameters 2024-09-01 08:58:20 -07:00
xfs_rmap.c xfs: move xfs_rmap_update_defer_add to xfs_rmap_item.c 2024-07-02 11:37:05 -07:00
xfs_rmap.h xfs: move xfs_rmap_update_defer_add to xfs_rmap_item.c 2024-07-02 11:37:05 -07:00
xfs_rtbitmap.c xfs: replace m_rsumsize with m_rsumblocks 2024-09-01 08:58:19 -07:00
xfs_rtbitmap.h xfs: remove xfs_{rtbitmap,rtsummary}_wordcount 2024-09-01 08:58:19 -07:00
xfs_sb.c xfs: standardize the btree maxrecs function parameters 2024-09-01 08:58:20 -07:00
xfs_sb.h xfs: ensure rtx mask/shift are correct after growfs 2024-09-01 08:58:19 -07:00
xfs_shared.h xfs: enable block size larger than page size support 2024-09-03 15:00:52 +02:00
xfs_symlink_remote.c xfs: pass the owner to xfs_symlink_write_target 2024-04-15 14:58:57 -07:00
xfs_symlink_remote.h xfs: pass the owner to xfs_symlink_write_target 2024-04-15 14:58:57 -07:00
xfs_trans_inode.c xfs: implement atime updates in xfs_trans_ichgtime 2024-07-02 11:36:56 -07:00
xfs_trans_resv.c xfs: replace shouty XFS_BM{BT,DR} macros 2024-09-01 08:58:20 -07:00
xfs_trans_resv.h xfs: rename xfs_*alloc*_log_count to _block_count 2022-04-28 10:25:59 -07:00
xfs_trans_space.c xfs: Add parent pointers to rename 2024-04-23 07:46:59 -07:00
xfs_trans_space.h xfs: Add parent pointers to rename 2024-04-23 07:46:59 -07:00
xfs_types.c xfs: rename xfs_verify_rtext to xfs_verify_rtbext 2023-10-17 16:24:22 -07:00
xfs_types.h xfs: remove xfs_validate_rtextents 2024-09-01 08:58:19 -07:00