Dave Chinner 956f1b8f80 xfs: fix rmap inefficiencies
Reduce the performance impact of the reverse mapping btree when reflink
 is enabled by using the much faster non-overlapped btree lookup
 functions when we're searching the rmap index with a fully specified
 key.  If we find the exact record we're looking for, great!  We don't
 have to perform the full overlapped scan.  For filesystems with high
 sharing factors this reduces the xfs_scrub runtime by a good 15%%.
 
 This has been shown to reduce the fstests runtime for realtime rmap
 configurations by 30%%, since the lack of AGs severely limits
 scalability.
 
 v2: simplify the non-overlapped lookup code per dave comments
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Merge tag 'rmap-speedups-5.19_2022-04-28' of git://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux into xfs-5.19-for-next

xfs: fix rmap inefficiencies

Reduce the performance impact of the reverse mapping btree when
reflink is enabled by using the much faster non-overlapped btree
lookup functions when we're searching the rmap index with a fully
specified key.  If we find the exact record we're looking for,
great!  We don't have to perform the full overlapped scan.  For
filesystems with high sharing factors this reduces the xfs_scrub
runtime by a good 15%%.

This has been shown to reduce the fstests runtime for realtime rmap
configurations by 30%%, since the lack of AGs severely limits
scalability.

Signed-off-by: Dave Chinner <david@fromorbit.com>
2022-05-04 12:37:18 +10:00
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