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L2ARC: Scan-based depth cap for persistent markers

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With persistent markers and inclusive scanning, the marker traverses the
entire ARC state across many feed cycles, writing buffers far from the
tail that may no longer be relevant.

Track cumulative bytes scanned per pass in l2arc_ext_scanned. When scans
reach l2arc_ext_headroom_pct (default 25%) of the ARC state size, reset
the pass markers to the tail via lazy reset flags. This keeps markers
focused on the tail zone where buffers soon to be evicted have the most
value for L2ARC.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Signed-off-by: Ameer Hamza <ahamza@ixsystems.com>
Closes #18289
This commit is contained in:
Ameer Hamza
2026-03-05 20:13:26 +05:00
committed by Brian Behlendorf
parent 15fc3d64c8
commit 62ca8f721b
4 changed files with 81 additions and 0 deletions
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tests/zfs-tests/include/tunables.cfg
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@@ -47,6 +47,7 @@ INITIALIZE_VALUE initialize_value zfs_initialize_value
KEEP_LOG_SPACEMAPS_AT_EXPORT keep_log_spacemaps_at_export zfs_keep_log_spacemaps_at_export
LUA_MAX_MEMLIMIT lua.max_memlimit zfs_lua_max_memlimit
L2ARC_DWPD_LIMIT l2arc.dwpd_limit l2arc_dwpd_limit
L2ARC_EXT_HEADROOM_PCT l2arc.ext_headroom_pct l2arc_ext_headroom_pct
L2ARC_MFUONLY l2arc.mfuonly l2arc_mfuonly
L2ARC_NOPREFETCH l2arc.noprefetch l2arc_noprefetch
L2ARC_REBUILD_BLOCKS_MIN_L2SIZE l2arc.rebuild_blocks_min_l2size l2arc_rebuild_blocks_min_l2size