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3523b5f3f9a73598e230d10c11a8c77a7c75973b
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Ameer Hamza 3523b5f3f9 L2ARC: Implement even-depth multi-sublist scanning 
The introduction of ARC multilists made L2ARC writing quite random,
depending on whether it found something to write in a randomly selected
sublist. This created inconsistent write patterns and poor utilization
of available sublists leading to uneven cache population.

This commit replaces random selection with systematic scanning across
all sublists within each burst. Fair headroom distribution ensures
even-depth traversal across all sublists until the target write size
is reached. Round-robin processing with random starting points eliminates
sequential bias while maintaining predictable write behavior.

The systematic approach provides consistent L2ARC filling patterns
and better utilization of available ARC data across all sublists.

Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ameer Hamza <ahamza@ixsystems.com>
Closes #18093
2026-02-04 10:05:53 -08:00
..
abd.c
Preserve LIFO ordering of kmap ops in abd_raidz_gen_iterate()
2025-12-09 09:12:16 -08:00
aggsum.c
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
arc.c
L2ARC: Implement even-depth multi-sublist scanning
2026-02-04 10:05:53 -08:00
blake3_zfs.c
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
blkptr.c
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
bplist.c
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
bpobj.c
Pass flags to more DMU write/hold functions
2025-10-29 11:17:51 -07:00
bptree.c
Pass flags to more DMU write/hold functions
2025-10-29 11:17:51 -07:00
bqueue.c
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
brt.c
Add BRT support to zpool prefetch command
2025-11-10 16:16:22 -08:00
btree.c
Prefer VERIFY0P(n) over VERIFY3P(n, ==, NULL)
2025-08-07 11:41:42 -07:00
dataset_kstats.c
ZIL: "crash" the ZIL if the pool suspends during fallback
2025-08-08 16:43:26 -07:00
dbuf_stats.c
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
dbuf.c
Lock db_mtx around arc_release() in couple places
2026-01-26 21:32:16 -05:00
ddt_log.c
DDT: Move logs searches out of the lock
2025-12-15 09:17:04 -08:00
ddt_stats.c
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
ddt_zap.c
DDT: Fix compressed entry buffer size
2025-12-15 14:52:44 -08:00
ddt.c
DDT: Add locking for table ZAP destruction
2026-01-13 15:07:15 -08:00
dmu_diff.c
Allow physical rewrite without logical
2025-08-06 10:36:07 -07:00
dmu_direct.c
Prefer VERIFY0P(n) over VERIFY3P(n, ==, NULL)
2025-08-07 11:41:42 -07:00
dmu_object.c
Prefer VERIFY0P(n) over VERIFY3P(n, ==, NULL)
2025-08-07 11:41:42 -07:00
dmu_objset.c
Fix snapshot automount expiry cancellation deadlock
2025-12-01 14:43:42 -08:00
dmu_recv.c
When receiving a stream with the large block flag, activate feature
2026-01-07 16:47:12 -08:00
dmu_redact.c
Pass flags to more DMU write/hold functions
2025-10-29 11:17:51 -07:00
dmu_send.c
Prefer VERIFY0P(n) over VERIFY3P(n, ==, NULL)
2025-08-07 11:41:42 -07:00
dmu_traverse.c
Allow physical rewrite without logical
2025-08-06 10:36:07 -07:00
dmu_tx.c
Prefer VERIFY0(n) over VERIFY(n == 0)
2025-08-07 11:40:59 -07:00
dmu_zfetch.c
tunables: remove legacy FreeBSD aliases
2025-09-08 10:03:01 -07:00
dmu.c
Add BRT support to zpool prefetch command
2025-11-10 16:16:22 -08:00
dnode_sync.c
Prefer VERIFY0P(n) over VERIFY3P(n, ==, NULL)
2025-08-07 11:41:42 -07:00
dnode.c
Update dnode_next_offset_level to accept blkid instead of offset
2025-11-04 13:12:17 -08:00
dsl_bookmark.c
Prefer VERIFY0P(n) over VERIFY3P(n, ==, NULL)
2025-08-07 11:41:42 -07:00
dsl_crypt.c
Prefer VERIFY0P(n) over VERIFY3P(n, ==, NULL)
2025-08-07 11:41:42 -07:00
dsl_dataset.c
Add snapshots_changed_nsecs dataset property
2026-01-06 09:36:20 -08:00
dsl_deadlist.c
Fix missed assertion update in physical rewrite patch
2025-08-13 15:56:25 -04:00
dsl_deleg.c
Prefer VERIFY0(n) over VERIFY(n == 0)
2025-08-07 11:40:59 -07:00
dsl_destroy.c
Prefer VERIFY0P(n) over VERIFY3P(n, ==, NULL)
2025-08-07 11:41:42 -07:00
dsl_dir.c
Prefer VERIFY0(n) over VERIFY(n == 0)
2025-08-07 11:40:59 -07:00
dsl_pool.c
Prefer VERIFY0P(n) over VERIFY(n == NULL)
2025-08-07 11:41:37 -07:00
dsl_prop.c
Prefer VERIFY0(n) over VERIFY(n == 0)
2025-08-07 11:40:59 -07:00
dsl_scan.c
Use reduced precision for scan times
2025-12-18 10:22:11 -08:00
dsl_synctask.c
dmu_tx_assign: make all VERIFY0 calls use DMU_TX_SUSPEND
2025-05-28 10:28:59 -07:00
dsl_userhold.c
Prefer VERIFY0(n) over VERIFY(n == 0)
2025-08-07 11:40:59 -07:00
edonr_zfs.c
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
fm.c
Prefer VERIFY0(n) over VERIFY(n == 0)
2025-08-07 11:40:59 -07:00
gzip.c
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
hkdf.c
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
lz4_zfs.c
SPDX: license tags: BSD-2-Clause
2025-03-13 17:56:46 -07:00
lz4.c
SPDX: license tags: BSD-2-Clause
2025-03-13 17:56:46 -07:00
lzjb.c
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
metaslab.c
Pass flags to more DMU write/hold functions
2025-10-29 11:17:51 -07:00
mmp.c
spa_misc: add an API for spa_namespace_lock
2025-11-10 14:23:39 -08:00
multilist.c
Allow vmem_alloc backed multilists
2025-08-12 13:36:03 -07:00
objlist.c
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
pathname.c
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
range_tree.c
range_tree: drop duplicate zfs_ prefix from rs_set_fill_raw
2025-09-29 16:38:52 -07:00
refcount.c
Implement allocation size ranges and use for gang leaves (#17111)
2025-05-02 15:32:18 -07:00
rrwlock.c
Prefer VERIFY0P(n) over VERIFY(n == NULL)
2025-08-07 11:41:37 -07:00
sa.c
Lock db_mtx around arc_release() in couple places
2026-01-26 21:32:16 -05:00
sha2_zfs.c
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
skein_zfs.c
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
spa_checkpoint.c
Pass flags to more DMU write/hold functions
2025-10-29 11:17:51 -07:00
spa_config.c
spa_misc: add an API for spa_namespace_lock
2025-11-10 14:23:39 -08:00
spa_errlog.c
Allow physical rewrite without logical
2025-08-06 10:36:07 -07:00
spa_history.c
Pass flags to more DMU write/hold functions
2025-10-29 11:17:51 -07:00
spa_log_spacemap.c
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
spa_misc.c
Use reduced precision for scan times
2025-12-18 10:22:11 -08:00
spa_stats.c
Prefer VERIFY0(n) over VERIFY(n == 0)
2025-08-07 11:40:59 -07:00
spa.c
Make sure we can still write data to txg
2026-01-26 21:33:21 -05:00
space_map.c
Pass flags to more DMU write/hold functions
2025-10-29 11:17:51 -07:00
space_reftree.c
Prefer VERIFY0(n) over VERIFY(n == 0)
2025-08-07 11:40:59 -07:00
THIRDPARTYLICENSE.cityhash
OpenZFS 8484 - Implement aggregate sum and use for arc counters
2018-06-06 09:35:59 -07:00
THIRDPARTYLICENSE.cityhash.descrip
OpenZFS 8484 - Implement aggregate sum and use for arc counters
2018-06-06 09:35:59 -07:00
txg.c
txg_wait_synced_flags: add TXG_WAIT_SUSPEND flag to not wait if pool suspended
2025-05-28 10:27:46 -07:00
u8_textprep.c
u8_textprep: move into module/zfs
2025-12-22 14:58:36 -08:00
uberblock.c
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
unique.c
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
vdev_draid_rand.c
SPDX: license tags: LicenseRef-OpenZFS-ThirdParty-PublicDomain
2025-03-13 17:57:31 -07:00
vdev_draid.c
Detect a slow raidz child during reads
2025-09-10 15:25:03 -07:00
vdev_file.c
Enable zhack to work properly with 4k sector size disks
2025-09-10 11:13:55 -07:00
vdev_indirect_births.c
Pass flags to more DMU write/hold functions
2025-10-29 11:17:51 -07:00
vdev_indirect_mapping.c
Pass flags to more DMU write/hold functions
2025-10-29 11:17:51 -07:00
vdev_indirect.c
Prefer VERIFY0P(n) over VERIFY3P(n, ==, NULL)
2025-08-07 11:41:42 -07:00
vdev_initialize.c
spa_misc: add an API for spa_namespace_lock
2025-11-10 14:23:39 -08:00
vdev_label.c
Cleanup ZIO_FLAG_IO_RETRY vs TRYHARD usage
2025-10-30 16:29:48 -07:00
vdev_mirror.c
Allow physical rewrite without logical
2025-08-06 10:36:07 -07:00
vdev_missing.c
Implement allocation size ranges and use for gang leaves (#17111)
2025-05-02 15:32:18 -07:00
vdev_queue.c
tunables: remove legacy FreeBSD aliases
2025-09-08 10:03:01 -07:00
vdev_raidz_math_aarch64_neon_common.h
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
vdev_raidz_math_aarch64_neon.c
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
vdev_raidz_math_aarch64_neonx2.c
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
vdev_raidz_math_avx2.c
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
vdev_raidz_math_avx512bw.c
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
vdev_raidz_math_avx512f.c
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
vdev_raidz_math_impl.h
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
vdev_raidz_math_powerpc_altivec_common.h
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
vdev_raidz_math_powerpc_altivec.c
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
vdev_raidz_math_scalar.c
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
vdev_raidz_math_sse2.c
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
vdev_raidz_math_ssse3.c
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
vdev_raidz_math.c
tunables: don't assert initialisation in impl getters
2025-05-28 16:50:22 -07:00
vdev_raidz.c
RAIDZ: Remove some excessive logging
2025-12-17 14:00:01 -08:00
vdev_rebuild.c
spa_misc: add an API for spa_namespace_lock
2025-11-10 14:23:39 -08:00
vdev_removal.c
spa_misc: add an API for spa_namespace_lock
2025-11-10 14:23:39 -08:00
vdev_root.c
Implement allocation size ranges and use for gang leaves (#17111)
2025-05-02 15:32:18 -07:00
vdev_trim.c
spa_misc: add an API for spa_namespace_lock
2025-11-10 14:23:39 -08:00
vdev.c
FreeBSD: unbreak compilation on i386
2026-01-14 17:02:41 -08:00
zap_leaf.c
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
zap_micro.c
DDT: Add/use zap_lookup_length_uint64_by_dnode()
2025-12-15 14:38:34 -08:00
zap.c
DDT: Add/use zap_lookup_length_uint64_by_dnode()
2025-12-15 14:38:34 -08:00
zcp_get.c
Add snapshots_changed_nsecs dataset property
2026-01-06 09:36:20 -08:00
zcp_global.c
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
zcp_iter.c
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
zcp_set.c
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
zcp_synctask.c
zcp_synctask: add zfs.sync.clone()
2025-06-10 14:53:10 -07:00
zcp.c
Prefer VERIFY0P(n) over VERIFY3P(n, ==, NULL)
2025-08-07 11:41:42 -07:00
zfeature.c
Synchronize the update of feature refcount
2025-08-22 16:35:58 -07:00
zfs_byteswap.c
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
zfs_chksum.c
chksum: run 256K benchmark on demand, preserve chksum_stat_data
2025-12-01 10:14:52 -08:00
zfs_crrd.c
Fix time database update calculations
2025-09-12 16:33:36 -07:00
zfs_debug_common.c
nvlist: Add nvlist_snprintf() and zfs_dbgmsg_nvlist()
2025-04-18 09:22:16 -04:00
zfs_fm.c
Fix snapshot automount expiry cancellation deadlock
2025-12-01 14:43:42 -08:00
zfs_fuid.c
libspl: move SID definitions from zfs_context.h; remove kernel gate
2025-11-12 10:01:48 -08:00
zfs_impl.c
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
zfs_ioctl.c
Fix history logging for zpool create -t
2026-01-14 14:51:51 -08:00
zfs_log.c
ZIL: pass commit errors back to ITX callbacks
2025-08-08 16:43:20 -07:00
zfs_onexit.c
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
zfs_quota.c
Bypass snprintf() in quota checks if no quotas set
2025-12-17 21:59:47 -05:00
zfs_ratelimit.c
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
zfs_replay.c
dmu_tx: rename dmu_tx_assign() flags from TXG_* to DMU_TX_* (#17143)
2025-03-18 16:04:22 -07:00
zfs_rlock.c
Prefer VERIFY0(n) over VERIFY3U(n, ==, 0)
2025-08-07 11:41:25 -07:00
zfs_sa.c
ZIL: allow zil_commit() to fail with error
2025-08-08 16:43:09 -07:00
zfs_vnops.c
ZIL: allow zil_commit() to fail with error
2025-08-08 16:43:09 -07:00
zfs_znode.c
Add default user/group/project quota properties
2025-04-03 10:35:22 -07:00
zil.c
ZIL: Make allocations more flexible
2025-08-14 08:50:17 -07:00
zio_checksum.c
Prefer VERIFY0(n) over VERIFY(n == 0)
2025-08-07 11:40:59 -07:00
zio_compress.c
Removed unused zio_decompress_fail_fraction variable
2025-08-06 17:10:03 -07:00
zio_inject.c
spa_misc: add an API for spa_namespace_lock
2025-11-10 14:23:39 -08:00
zio.c
DDT: Move logs searches out of the lock
2025-12-15 09:17:04 -08:00
zle.c
SPDX: license tags: CDDL-1.0
2025-03-13 17:56:27 -07:00
zrlock.c
Prefer VERIFY0P(n) over VERIFY3P(n, ==, NULL)
2025-08-07 11:41:42 -07:00
zthr.c
Prefer VERIFY0P(n) over VERIFY3P(n, ==, NULL)
2025-08-07 11:41:42 -07:00
zvol.c
spa_misc: add an API for spa_namespace_lock
2025-11-10 14:23:39 -08:00