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zfs.4: document five missing module parameters

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Add entries for module parameters that are exposed via
ZFS_MODULE_PARAM but not covered in zfs.4:

  zfs_active_allocator          (charp,  module/zfs/metaslab.c)
  zfs_compressed_arc_enabled    (int,    module/zfs/arc.c)
  zfs_arc_no_grow_shift         (uint,   module/os/freebsd/zfs/arc_os.c)
  zfs_scan_blkstats             (int,    module/zfs/dsl_scan.c)
  zfs_snapshot_history_enabled  (int,    module/zfs/dsl_dataset.c)

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Christos Longros <chris.longros@gmail.com>
Closes #18456
This commit is contained in:
Christos Longros
2026-04-25 23:39:43 +02:00
committed by GitHub
parent 8da4729732
commit 4a58ab8ce2
1 changed files with 28 additions and 0 deletions
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man/man4/zfs.4
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@@ -745,6 +745,13 @@ depends on kernel configuration.
This is the minimum allocation size that will use scatter (page-based) ABDs. This is the minimum allocation size that will use scatter (page-based) ABDs.
Smaller allocations will use linear ABDs. Smaller allocations will use linear ABDs.
. .
.It Sy zfs_active_allocator Ns = Ns Sy dynamic Pq charp
Select the SPA metaslab allocator.
Valid values are
.Sy dynamic
and
.Sy cursor .
.
.It Sy zfs_arc_dnode_limit Ns = Ns Sy 0 Ns B Pq u64 .It Sy zfs_arc_dnode_limit Ns = Ns Sy 0 Ns B Pq u64
When the number of bytes consumed by dnodes in the ARC exceeds this number of When the number of bytes consumed by dnodes in the ARC exceeds this number of
bytes, try to unpin some of it in response to demand for non-metadata. bytes, try to unpin some of it in response to demand for non-metadata.
@@ -937,6 +944,13 @@ If
equivalent to the greater of the number of online CPUs and equivalent to the greater of the number of online CPUs and
.Sy 4 . .Sy 4 .
. .
.It Sy zfs_arc_no_grow_shift Ns = Ns Sy 5 Pq uint
If less than
.Sy arc_c No >> Sy zfs_arc_no_grow_shift
free memory is available, the ARC is not allowed to grow.
This parameter is
.Fx Ns -specific .
.
.It Sy zfs_arc_overflow_shift Ns = Ns Sy 8 Pq int .It Sy zfs_arc_overflow_shift Ns = Ns Sy 8 Pq int
The ARC size is considered to be overflowing if it exceeds the current The ARC size is considered to be overflowing if it exceeds the current
ARC target size ARC target size
@@ -1034,6 +1048,11 @@ The timeout is scaled based on a percentage of the last lwb
latency to avoid significantly impacting the latency of each individual latency to avoid significantly impacting the latency of each individual
transaction record (itx). transaction record (itx).
. .
.It Sy zfs_compressed_arc_enabled Ns = Ns Sy 1 Ns | Ns 0 Pq int
Enables storing ARC buffers in their on-disk compressed form, reducing
memory pressure.
When disabled, buffers are decompressed before being cached.
.
.It Sy zfs_condense_indirect_commit_entry_delay_ms Ns = Ns Sy 0 Ns ms Pq int .It Sy zfs_condense_indirect_commit_entry_delay_ms Ns = Ns Sy 0 Ns ms Pq int
Vdev indirection layer (used for device removal) sleeps for this many Vdev indirection layer (used for device removal) sleeps for this many
milliseconds during mapping generation. milliseconds during mapping generation.
@@ -1690,6 +1709,11 @@ which have the
.Em no_root_squash .Em no_root_squash
option set. option set.
. .
.It Sy zfs_snapshot_history_enabled Ns = Ns Sy 1 Ns | Ns 0 Pq int
Whether snapshot creation and destruction events are recorded in the pool
history log, viewable with
.Nm zpool Cm history .
.
.It Sy zfs_snapshot_no_setuid Ns = Ns Sy 0 Ns | Ns 1 Pq int .It Sy zfs_snapshot_no_setuid Ns = Ns Sy 0 Ns | Ns 1 Pq int
Whether to disable Whether to disable
.Em setuid/setgid .Em setuid/setgid
@@ -2181,6 +2205,10 @@ working on a scrub between TXG flushes.
.It Sy zfs_scrub_error_blocks_per_txg Ns = Ns Sy 4096 Pq uint .It Sy zfs_scrub_error_blocks_per_txg Ns = Ns Sy 4096 Pq uint
Error blocks to be scrubbed in one txg. Error blocks to be scrubbed in one txg.
. .
.It Sy zfs_scan_blkstats Ns = Ns Sy 0 Ns | Ns 1 Pq int
When enabled, ZFS counts blocks by type and indirection level during a scrub.
The counts are kept in memory for debugging and are not exposed to userspace.
.
.It Sy zfs_scan_checkpoint_intval Ns = Ns Sy 7200 Ns s Po 2 hour Pc Pq uint .It Sy zfs_scan_checkpoint_intval Ns = Ns Sy 7200 Ns s Po 2 hour Pc Pq uint
To preserve progress across reboots, the sequential scan algorithm periodically To preserve progress across reboots, the sequential scan algorithm periodically
needs to stop metadata scanning and issue all the verification I/O to disk. needs to stop metadata scanning and issue all the verification I/O to disk.