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DDT: Add/use zap_lookup_length_uint64_by_dnode()

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Unlike other ZAP consumers due to compression DDT does not know
how big entry it is reading from ZAP.  Due to this it called
zap_length_uint64_by_dnode() and zap_lookup_uint64_by_dnode(),
each of which does full ZAP entry lookup.

Introduction of the combined ZAP method dramatically reduces the
CPU overhead and locks contention at DBUF layer.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com>
Closes #18048
This commit is contained in:
Alexander Motin
2025-12-15 17:38:34 -05:00
committed by GitHub
parent ff5414406f
commit 3b1ff816bd
5 changed files with 46 additions and 26 deletions
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include/sys/zap.h
+3
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@@ -226,6 +226,9 @@ int zap_lookup_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key,
int key_numints, uint64_t integer_size, uint64_t num_integers, void *buf);
int zap_lookup_uint64_by_dnode(dnode_t *dn, const uint64_t *key,
int key_numints, uint64_t integer_size, uint64_t num_integers, void *buf);
int zap_lookup_length_uint64_by_dnode(dnode_t *dn, const uint64_t *key,
int key_numints, uint64_t integer_size, uint64_t num_integers, void *buf,
uint64_t *actual_num_integers);
int zap_contains(objset_t *ds, uint64_t zapobj, const char *name);
int zap_prefetch(objset_t *os, uint64_t zapobj, const char *name);
int zap_prefetch_object(objset_t *os, uint64_t zapobj);