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Decrease contention on dn_struct_rwlock

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Currently, sequential async write workloads spend a lot of time 
contending on the dn_struct_rwlock. This lock is responsible for 
protecting the entire block tree below it; this naturally results 
in some serialization during heavy write workloads. This can be 
resolved by having per-dbuf locking, which will allow multiple 
writers in the same object at the same time.

We introduce a new rwlock, the db_rwlock. This lock is responsible 
for protecting the contents of the dbuf that it is a part of; when 
reading a block pointer from a dbuf, you hold the lock as a reader. 
When writing data to a dbuf, you hold it as a writer. This allows 
multiple threads to write to different parts of a file at the same 
time.

Reviewed by: Brad Lewis <brad.lewis@delphix.com>
Reviewed by: Matt Ahrens matt@delphix.com
Reviewed by: George Wilson george.wilson@delphix.com
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Paul Dagnelie <pcd@delphix.com>
External-issue: DLPX-52564
External-issue: DLPX-53085
External-issue: DLPX-57384
Closes #8946
This commit is contained in:
Paul Dagnelie
2019-07-08 13:18:50 -07:00
committed by Brian Behlendorf
parent cb70964221
commit f664f1ee7f
7 changed files with 247 additions and 120 deletions
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include/sys/dmu_zfetch.h
+3 -2
View File
@@ -24,7 +24,7 @@
*/
/*
* Copyright (c) 2014 by Delphix. All rights reserved.
* Copyright (c) 2014, 2017 by Delphix. All rights reserved.
*/
#ifndef _DMU_ZFETCH_H
@@ -66,7 +66,8 @@ void zfetch_fini(void);
void dmu_zfetch_init(zfetch_t *, struct dnode *);
void dmu_zfetch_fini(zfetch_t *);
void dmu_zfetch(zfetch_t *, uint64_t, uint64_t, boolean_t);
void dmu_zfetch(zfetch_t *, uint64_t, uint64_t, boolean_t,
boolean_t);
#ifdef __cplusplus