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Fast Clone Deletion

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Deleting a clone requires finding blocks are clone-only, not shared
with the snapshot. This was done by traversing the entire block tree
which results in a large performance penalty for sparsely
written clones.

This is new method keeps track of clone blocks when they are
modified in a "Livelist" so that, when it’s time to delete,
the clone-specific blocks are already at hand.

We see performance improvements because now deletion work is
proportional to the number of clone-modified blocks, not the size
of the original dataset.

Reviewed-by: Sean Eric Fagan <sef@ixsystems.com>
Reviewed-by: Matt Ahrens <matt@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Serapheim Dimitropoulos <serapheim@delphix.com>
Signed-off-by: Sara Hartse <sara.hartse@delphix.com>
Closes #8416
This commit is contained in:
Sara Hartse
2019-07-26 10:54:14 -07:00
committed by Brian Behlendorf
parent d274ac5460
commit 37f03da8ba
38 changed files with 2583 additions and 205 deletions
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tests/runfiles/linux.run
+5 -2
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@@ -147,12 +147,15 @@ tests = ['zfs_create_001_pos', 'zfs_create_002_pos', 'zfs_create_003_pos',
tags = ['functional', 'cli_root', 'zfs_create']
[tests/functional/cli_root/zfs_destroy]
tests = ['zfs_destroy_001_pos', 'zfs_destroy_002_pos', 'zfs_destroy_003_pos',
tests = ['zfs_clone_livelist_condense_and_disable',
'zfs_clone_livelist_condense_races', 'zfs_destroy_001_pos',
'zfs_destroy_002_pos', 'zfs_destroy_003_pos',
'zfs_destroy_004_pos', 'zfs_destroy_005_neg', 'zfs_destroy_006_neg',
'zfs_destroy_007_neg', 'zfs_destroy_008_pos', 'zfs_destroy_009_pos',
'zfs_destroy_010_pos', 'zfs_destroy_011_pos', 'zfs_destroy_012_pos',
'zfs_destroy_013_neg', 'zfs_destroy_014_pos', 'zfs_destroy_015_pos',
'zfs_destroy_016_pos']
'zfs_destroy_016_pos', 'zfs_destroy_clone_livelist',
'zfs_destroy_dev_removal', 'zfs_destroy_dev_removal_condense']
tags = ['functional', 'cli_root', 'zfs_destroy']
[tests/functional/cli_root/zfs_diff]