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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 GitHub
parent 084531bcce
commit 1b495eeab3
13 changed files with 366 additions and 202 deletions
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include/sys/ddt.h
+2 -5
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@@ -285,14 +285,11 @@ typedef struct {
ddt_log_t *ddt_log_active; /* pointers into ddt_log */
ddt_log_t *ddt_log_flushing; /* swapped when flush starts */
hrtime_t ddt_flush_start; /* log flush start this txg */
uint32_t ddt_flush_pass; /* log flush pass this txg */
int32_t ddt_flush_count; /* entries flushed this txg */
int32_t ddt_flush_min; /* min rem entries to flush */
int32_t ddt_log_ingest_rate; /* rolling log ingest rate */
int32_t ddt_log_flush_rate; /* rolling log flush rate */
int32_t ddt_log_flush_time_rate; /* avg time spent flushing */
uint32_t ddt_log_flush_pressure; /* pressure to apply for cap */
uint32_t ddt_log_flush_prev_backlog; /* prev backlog size */
uint64_t ddt_flush_force_txg; /* flush hard before this txg */