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FDT dedup log sync -- remove incremental

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This PR condenses the FDT dedup log syncing into a single sync
pass. This reduces the overhead of modifying indirect blocks for the
dedup table multiple times per txg. In addition, changes were made to
the formula for how much to sync per txg. We now also consider the
backlog we have to clear, to prevent it from growing too large, or
remaining large on an idle system.

Sponsored-by: Klara, Inc.
Sponsored-by: iXsystems, Inc.
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Authored-by: Don Brady <don.brady@klarasystems.com>
Authored-by: Paul Dagnelie <paul.dagnelie@klarasystems.com>
Signed-off-by: Paul Dagnelie <paul.dagnelie@klarasystems.com>
Closes #17038
This commit is contained in:
Paul Dagnelie
2025-03-13 10:47:03 -07:00
committed by Alexander Motin
parent f9d59b579e
commit 661310ff5c
13 changed files with 366 additions and 202 deletions
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tests/zfs-tests/include/tunables.cfg
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@@ -32,6 +32,8 @@ DDT_ZAP_DEFAULT_BS dedup.ddt_zap_default_bs ddt_zap_default_bs
DDT_ZAP_DEFAULT_IBS dedup.ddt_zap_default_ibs ddt_zap_default_ibs
DDT_DATA_IS_SPECIAL ddt_data_is_special zfs_ddt_data_is_special
DEDUP_LOG_TXG_MAX dedup.log_txg_max zfs_dedup_log_txg_max
DEDUP_LOG_FLUSH_ENTRIES_MAX dedup.log_flush_entries_max zfs_dedup_log_flush_entries_max
DEDUP_LOG_FLUSH_ENTRIES_MIN dedup.log_flush_entries_min zfs_dedup_log_flush_entries_min
DEADMAN_CHECKTIME_MS deadman.checktime_ms zfs_deadman_checktime_ms
DEADMAN_EVENTS_PER_SECOND deadman_events_per_second zfs_deadman_events_per_second
DEADMAN_FAILMODE deadman.failmode zfs_deadman_failmode