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Introduce a tunable to exclude special class buffers from L2ARC

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Special allocation class or dedup vdevs may have roughly the same
performance as L2ARC vdevs. Introduce a new tunable to exclude those
buffers from being cacheable on L2ARC.

Reviewed-by: Don Brady <don.brady@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: George Amanakis <gamanakis@gmail.com>
Closes #11761 
Closes #12285
This commit is contained in:
George Amanakis
2021-11-11 21:52:16 +01:00
committed by GitHub
parent 420b44488f
commit c9d62d1356
8 changed files with 119 additions and 21 deletions
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module/zfs/dmu.c
+1 -1
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@@ -1839,7 +1839,7 @@ dmu_sync(zio_t *pio, uint64_t txg, dmu_sync_cb_t *done, zgd_t *zgd)
dsa->dsa_tx = NULL;
zio_nowait(arc_write(pio, os->os_spa, txg,
zgd->zgd_bp, dr->dt.dl.dr_data, DBUF_IS_L2CACHEABLE(db),
zgd->zgd_bp, dr->dt.dl.dr_data, dbuf_is_l2cacheable(db),
&zp, dmu_sync_ready, NULL, NULL, dmu_sync_done, dsa,
ZIO_PRIORITY_SYNC_WRITE, ZIO_FLAG_CANFAIL, &zb));