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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
View File
@@ -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);
include/sys/arc_impl.h
+19 -1
View File
@@ -41,14 +41,25 @@
extern "C" {
#endif
/*
* We can feed L2ARC from two states of ARC buffers, mru and mfu,
* and each of the states has two types: data and metadata.
*/
#define L2ARC_FEED_TYPES 4
/*
* L2ARC state and statistics for persistent marker management.
*/
typedef struct l2arc_info {
arc_buf_hdr_t ***l2arc_markers; /* persistent markers */
arc_buf_hdr_t **l2arc_markers[L2ARC_FEED_TYPES];
uint64_t l2arc_total_writes; /* total writes for reset */
uint64_t l2arc_total_capacity; /* total L2ARC capacity */
uint64_t l2arc_smallest_capacity; /* smallest device capacity */
/*
* Per-device thread coordination for sublist processing
*/
boolean_t *l2arc_sublist_busy[L2ARC_FEED_TYPES];
kmutex_t l2arc_sublist_lock; /* protects busy flags */
} l2arc_info_t;
/*
@@ -431,6 +442,13 @@ typedef struct l2arc_dev {
*/
zfs_refcount_t l2ad_lb_count;
boolean_t l2ad_trim_all; /* TRIM whole device */
/*
* Per-device feed thread for parallel L2ARC writes
*/
kthread_t *l2ad_feed_thread; /* feed thread handle */
boolean_t l2ad_thread_exit; /* signal thread exit */
kmutex_t l2ad_feed_thr_lock; /* thread sleep/wake */
kcondvar_t l2ad_feed_cv; /* thread wakeup cv */
} l2arc_dev_t;
/*