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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 Tony Hutter
parent c8f795ba53
commit 8bd3dca9bf
8 changed files with 119 additions and 21 deletions
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include/sys/arc.h
+1
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@@ -85,6 +85,7 @@ typedef void arc_prune_func_t(int64_t bytes, void *priv);
/* Shared module parameters */
extern int zfs_arc_average_blocksize;
extern int l2arc_exclude_special;
/* generic arc_done_func_t's which you can use */
arc_read_done_func_t arc_bcopy_func;
include/sys/dbuf.h
+1 -10
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@@ -441,16 +441,7 @@ dbuf_find_dirty_eq(dmu_buf_impl_t *db, uint64_t txg)
(dbuf_is_metadata(_db) && \
((_db)->db_objset->os_primary_cache == ZFS_CACHE_METADATA)))
#define DBUF_IS_L2CACHEABLE(_db) \
((_db)->db_objset->os_secondary_cache == ZFS_CACHE_ALL || \
(dbuf_is_metadata(_db) && \
((_db)->db_objset->os_secondary_cache == ZFS_CACHE_METADATA)))
#define DNODE_LEVEL_IS_L2CACHEABLE(_dn, _level) \
((_dn)->dn_objset->os_secondary_cache == ZFS_CACHE_ALL || \
(((_level) > 0 || \
DMU_OT_IS_METADATA((_dn)->dn_handle->dnh_dnode->dn_type)) && \
((_dn)->dn_objset->os_secondary_cache == ZFS_CACHE_METADATA)))
boolean_t dbuf_is_l2cacheable(dmu_buf_impl_t *db);
#ifdef ZFS_DEBUG
include/sys/dmu_objset.h
-4
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@@ -200,10 +200,6 @@ struct objset {
#define DMU_GROUPUSED_DNODE(os) ((os)->os_groupused_dnode.dnh_dnode)
#define DMU_PROJECTUSED_DNODE(os) ((os)->os_projectused_dnode.dnh_dnode)
#define DMU_OS_IS_L2CACHEABLE(os) \
((os)->os_secondary_cache == ZFS_CACHE_ALL || \
(os)->os_secondary_cache == ZFS_CACHE_METADATA)
/* called from zpl */
int dmu_objset_hold(const char *name, void *tag, objset_t **osp);
int dmu_objset_hold_flags(const char *name, boolean_t decrypt, void *tag,