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Dave Chinner 16fd536737 xfs: track AGs with reclaimable inodes in per-ag radix tree 
https://bugzilla.kernel.org/show_bug.cgi?id=16348

When the filesystem grows to a large number of allocation groups,
the summing of recalimable inodes gets expensive. In many cases,
most AGs won't have any reclaimable inodes and so we are wasting CPU
time aggregating over these AGs. This is particularly important for
the inode shrinker that gets called frequently under memory
pressure.

To avoid the overhead, track AGs with reclaimable inodes in the
per-ag radix tree so that we can find all the AGs with reclaimable
inodes via a simple gang tag lookup. This involves setting the tag
when the first reclaimable inode is tracked in the AG, and removing
the tag when the last reclaimable inode is removed from the tree.
Then the summation process becomes a loop walking the radix tree
summing AGs with the reclaim tag set.

This significantly reduces the overhead of scanning - a 6400 AG
filesystea now only uses about 25% of a cpu in kswapd while slab
reclaim progresses instead of being permanently stuck at 100% CPU
and making little progress. Clean filesystems filesystems will see
no overhead and the overhead only increases linearly with the number
of dirty AGs.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
 		2010-07-20 09:43:39 +10:00
..
linux-2.6 xfs: track AGs with reclaimable inodes in per-ag radix tree 2010-07-20 09:43:39 +10:00
quota mm: add context argument to shrinker callback 2010-07-19 14:56:17 +10:00
support xfs: event tracing support 2009-12-14 23:08:16 -06:00
Kconfig xfs: use generic Posix ACL code 2009-06-10 17:07:47 +02:00
Makefile xfs: Introduce delayed logging core code 2010-05-24 10:38:03 -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: Improve scalability of busy extent tracking 2010-05-24 10:34:00 -05:00
xfs_alloc.h xfs: Improve scalability of busy extent tracking 2010-05-24 10:34:00 -05:00
xfs_alloc_btree.c xfs: Improve scalability of busy extent tracking 2010-05-24 10:34:00 -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 duplicate buffer flags 2010-01-21 13:44:36 -06:00
xfs_attr.h xfs: convert attr to use unsigned names 2010-01-20 10:47:48 +11:00
xfs_attr_leaf.c xfs: remove duplicate buffer flags 2010-01-21 13:44:36 -06:00
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: fix reservation release commit flag in xfs_bmap_add_attrfork() 2010-05-19 09:58:08 -05:00
xfs_bmap.h xfs: event tracing support 2009-12-14 23:08:16 -06:00
xfs_bmap_btree.c xfs: make several more functions static 2010-01-15 15:31:38 -06:00
xfs_bmap_btree.h xfs: make several more functions static 2010-01-15 15:31:38 -06:00
xfs_btree.c xfs: remove duplicate buffer flags 2010-01-21 13:44:36 -06:00
xfs_btree.h xfs: add more statics & drop some unused functions 2009-08-31 14:46:20 -05:00
xfs_btree_trace.c
…
xfs_btree_trace.h xfs: event tracing support 2009-12-14 23:08:16 -06:00
xfs_buf_item.c xfs: Ensure inode allocation buffers are fully replayed 2010-05-24 10:41:22 -05:00
xfs_buf_item.h xfs: Ensure inode allocation buffers are fully replayed 2010-05-24 10:41:22 -05:00
xfs_da_btree.c xfs: convert dirnameops to unsigned char names 2010-01-20 10:47:17 +11:00
xfs_da_btree.h xfs: convert dirnameops to unsigned char names 2010-01-20 10:47:17 +11:00
xfs_dfrag.c xfs: prevent swapext from operating on write-only files 2010-06-24 12:07:47 +10:00
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_dir2.c xfs: clean up sign warnings in dir2 code 2010-01-20 10:48:05 +11:00
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: clean up sign warnings in dir2 code 2010-01-20 10:48:05 +11:00
xfs_dir2_block.h
…
xfs_dir2_data.c
…
xfs_dir2_data.h
…
xfs_dir2_leaf.c xfs: clean up sign warnings in dir2 code 2010-01-20 10:48:05 +11:00
xfs_dir2_leaf.h
…
xfs_dir2_node.c xfs: make several more functions static 2010-01-15 15:31:38 -06:00
xfs_dir2_node.h xfs: make several more functions static 2010-01-15 15:31:38 -06:00
xfs_dir2_sf.c xfs: clean up sign warnings in dir2 code 2010-01-20 10:48:05 +11:00
xfs_dir2_sf.h
…
xfs_dmapi.h
…
xfs_dmops.c
…
xfs_error.c xfs: clean up log ticket overrun debug output 2010-05-24 10:33:46 -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: remove stale parameter from ->iop_unpin method 2010-05-19 09:58:08 -05:00
xfs_extfree_item.h
…
xfs_filestream.c xfs: Kill filestreams cache flush 2010-01-15 15:34:22 -06:00
xfs_filestream.h xfs: Kill filestreams cache flush 2010-01-15 15:34:22 -06:00
xfs_fs.h xfs: return inode fork offset in bulkstat for fsr 2010-03-05 11:02:07 -06:00
xfs_fsops.c xfs: Replace per-ag array with a radix tree 2010-01-15 15:33:52 -06:00
xfs_fsops.h
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xfs_ialloc.c xfs: remove block number from inode lookup code 2010-06-24 11:35:17 +10:00
xfs_ialloc.h xfs: rationalize xfs_inobt_lookup* 2009-09-01 12:45:39 -05:00
xfs_ialloc_btree.c
…
xfs_ialloc_btree.h
…
xfs_iget.c xfs: remove block number from inode lookup code 2010-06-24 11:35:17 +10:00
xfs_inode.c xfs: remove block number from inode lookup code 2010-06-24 11:35:17 +10:00
xfs_inode.h xfs: remove block number from inode lookup code 2010-06-24 11:35:17 +10:00
xfs_inode_item.c xfs: remove stale parameter from ->iop_unpin method 2010-05-19 09:58:08 -05:00
xfs_inode_item.h xfs: Don't issue buffer IO direct from AIL push V2 2010-02-02 10:13:42 +11:00
xfs_inum.h xfs: remove XFS_INO64_OFFSET 2009-08-31 14:46:22 -05:00
xfs_iomap.c xfs: mark xfs_iomap_write_ helpers static 2010-05-19 09:58:20 -05:00
xfs_iomap.h xfs: mark xfs_iomap_write_ helpers static 2010-05-19 09:58:20 -05:00
xfs_itable.c xfs: remove block number from inode lookup code 2010-06-24 11:35:17 +10:00
xfs_itable.h xfs: remove block number from inode lookup code 2010-06-24 11:35:17 +10:00
xfs_log.c xfs: forced unmounts need to push the CIL 2010-05-24 10:38:14 -05:00
xfs_log.h xfs: Ensure inode allocation buffers are fully replayed 2010-05-24 10:41:22 -05:00
xfs_log_cil.c xfs: Ensure inode allocation buffers are fully replayed 2010-05-24 10:41:22 -05:00
xfs_log_priv.h xfs: enable background pushing of the CIL 2010-05-24 10:38:20 -05:00
xfs_log_recover.c xfs: remove block number from inode lookup code 2010-06-24 11:35:17 +10:00
xfs_log_recover.h xfs: Clean up XFS_BLI_* flag namespace 2010-05-24 10:33:39 -05:00
xfs_mount.c xfs: remove block number from inode lookup code 2010-06-24 11:35:17 +10:00
xfs_mount.h xfs: convert inode shrinker to per-filesystem contexts 2010-07-20 08:07:02 +10:00
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
…
xfs_rename.c xfs: event tracing support 2009-12-14 23:08:16 -06:00
xfs_rtalloc.c xfs: remove block number from inode lookup code 2010-06-24 11:35:17 +10:00
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: only clear the suid bit once in xfs_write 2010-02-12 13:43:57 -06:00
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: cleanup log reservation calculactions 2010-05-28 14:58:30 -05:00
xfs_trans.h xfs: cleanup log reservation calculactions 2010-05-28 14:58:30 -05:00
xfs_trans_ail.c xfs: Don't issue buffer IO direct from AIL push V2 2010-02-02 10:13:42 +11:00
xfs_trans_buf.c xfs: Ensure inode allocation buffers are fully replayed 2010-05-24 10:41:22 -05:00
xfs_trans_extfree.c
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xfs_trans_inode.c xfs: remove block number from inode lookup code 2010-06-24 11:35:17 +10:00
xfs_trans_item.c xfs: Introduce delayed logging core code 2010-05-24 10:38:03 -05:00
xfs_trans_priv.h xfs: Introduce delayed logging core code 2010-05-24 10:38:03 -05:00
xfs_trans_space.h
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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_utils.h
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xfs_vnodeops.c xfs: remove block number from inode lookup code 2010-06-24 11:35:17 +10:00
xfs_vnodeops.h xfs: kill xfs_lrw.h 2010-03-01 16:35:44 -06:00