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ZAP: Massively switch to _by_dnode() interfaces

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Before this change ZAP called dnode_hold() for almost every block
access, that was clearly visible in profiler under heavy load, such
as BRT.  This patch makes it always hold the dnode reference between
zap_lockdir() and zap_unlockdir().  It allows to avoid most of dnode
operations between those.  It also adds several new _by_dnode() APIs
to ZAP and uses them in BRT code.  Also adds dmu_prefetch_by_dnode()
variant and uses it in the ZAP code.

After this there remains only one call to dmu_buf_dnode_enter(),
which seems to be unneeded.  So remove the call and the functions.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
Closes #15951
This commit is contained in:
Alexander Motin
2024-03-25 17:58:50 -04:00
committed by GitHub
parent bf8f72359d
commit 80cc516295
9 changed files with 202 additions and 172 deletions
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include/sys/zap.h
+8
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@@ -253,6 +253,9 @@ int zap_add_by_dnode(dnode_t *dn, const char *key,
int zap_add_uint64(objset_t *ds, uint64_t zapobj, const uint64_t *key,
int key_numints, int integer_size, uint64_t num_integers,
const void *val, dmu_tx_t *tx);
int zap_add_uint64_by_dnode(dnode_t *dn, const uint64_t *key,
int key_numints, int integer_size, uint64_t num_integers,
const void *val, dmu_tx_t *tx);
/*
* Set the attribute with the given name to the given value. If an
@@ -267,6 +270,9 @@ int zap_update(objset_t *ds, uint64_t zapobj, const char *name,
int zap_update_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key,
int key_numints,
int integer_size, uint64_t num_integers, const void *val, dmu_tx_t *tx);
int zap_update_uint64_by_dnode(dnode_t *dn, const uint64_t *key,
int key_numints,
int integer_size, uint64_t num_integers, const void *val, dmu_tx_t *tx);
/*
* Get the length (in integers) and the integer size of the specified
@@ -292,6 +298,8 @@ int zap_remove_norm(objset_t *ds, uint64_t zapobj, const char *name,
int zap_remove_by_dnode(dnode_t *dn, const char *name, dmu_tx_t *tx);
int zap_remove_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key,
int key_numints, dmu_tx_t *tx);
int zap_remove_uint64_by_dnode(dnode_t *dn, const uint64_t *key,
int key_numints, dmu_tx_t *tx);
/*
* Returns (in *count) the number of attributes in the specified zap