tag name | rmap-speedups-5.19_2022-04-28 (19603061d2c8d74b4c3c48f8d869ec76a48d9449) |
tag date | 2022-04-28 12:04:57 -0700 |
tagged by | Darrick J. Wong <djwong@kernel.org> |
tagged object | commit 1edf805613... |
download | linux-rmap-speedups-5.19_2022-04-28.tar.gz |
---|
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
-----BEGIN PGP SIGNATURE-----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=73GF
-----END PGP SIGNATURE-----