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L2ARC: Implement per-device feed threads for parallel writes

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Transform L2ARC from single global feed thread to per-device threads,
enabling parallel writes to multiple L2ARC devices. Each device runs
its own feed thread independently, improving multi-device throughput.
Previously, a single thread served all devices sequentially; now each
device writes concurrently. Threads are created during device addition
and torn down on removal.

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
This commit is contained in:
Ameer Hamza
2025-12-11 23:06:19 +05:00
committed by Brian Behlendorf
parent 825dc41ad4
commit b525525b44
4 changed files with 172 additions and 184 deletions
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include/sys/arc.h
-2
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@@ -354,8 +354,6 @@ boolean_t l2arc_range_check_overlap(uint64_t bottom, uint64_t top,
uint64_t check);
void l2arc_init(void);
void l2arc_fini(void);
void l2arc_start(void);
void l2arc_stop(void);
void l2arc_spa_rebuild_start(spa_t *spa);
void l2arc_spa_rebuild_stop(spa_t *spa);