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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_objset.c
+32 -2
View File
@@ -63,6 +63,8 @@
#include <sys/dmu_recv.h>
#include <sys/zfs_project.h>
#include "zfs_namecheck.h"
#include <sys/vdev_impl.h>
#include <sys/arc.h>
/*
* Needed to close a window in dnode_move() that allows the objset to be freed
@@ -411,6 +413,34 @@ dnode_multilist_index_func(multilist_t *ml, void *obj)
multilist_get_num_sublists(ml));
}
static inline boolean_t
dmu_os_is_l2cacheable(objset_t *os)
{
vdev_t *vd = NULL;
zfs_cache_type_t cache = os->os_secondary_cache;
blkptr_t *bp = os->os_rootbp;
if (bp != NULL && !BP_IS_HOLE(bp)) {
uint64_t vdev = DVA_GET_VDEV(bp->blk_dva);
vdev_t *rvd = os->os_spa->spa_root_vdev;
if (vdev < rvd->vdev_children)
vd = rvd->vdev_child[vdev];
if (cache == ZFS_CACHE_ALL || cache == ZFS_CACHE_METADATA) {
if (vd == NULL)
return (B_TRUE);
if ((vd->vdev_alloc_bias != VDEV_BIAS_SPECIAL &&
vd->vdev_alloc_bias != VDEV_BIAS_DEDUP) ||
l2arc_exclude_special == 0)
return (B_TRUE);
}
}
return (B_FALSE);
}
/*
* Instantiates the objset_t in-memory structure corresponding to the
* objset_phys_t that's pointed to by the specified blkptr_t.
@@ -453,7 +483,7 @@ dmu_objset_open_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp,
SET_BOOKMARK(&zb, ds ? ds->ds_object : DMU_META_OBJSET,
ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
if (DMU_OS_IS_L2CACHEABLE(os))
if (dmu_os_is_l2cacheable(os))
aflags |= ARC_FLAG_L2CACHE;
if (ds != NULL && ds->ds_dir->dd_crypto_obj != 0) {
@@ -1663,7 +1693,7 @@ dmu_objset_sync(objset_t *os, zio_t *pio, dmu_tx_t *tx)
}
zio = arc_write(pio, os->os_spa, tx->tx_txg,
blkptr_copy, os->os_phys_buf, DMU_OS_IS_L2CACHEABLE(os),
blkptr_copy, os->os_phys_buf, dmu_os_is_l2cacheable(os),
&zp, dmu_objset_write_ready, NULL, NULL, dmu_objset_write_done,
os, ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb);