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OpenZFS 7968 - multi-threaded spa_sync()

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Reviewed by: Pavel Zakharov <pavel.zakharov@delphix.com>
Reviewed by: Brad Lewis <brad.lewis@delphix.com>
Reviewed by: Saso Kiselkov <saso.kiselkov@nexenta.com>
Reviewed by: Brian Behlendorf <behlendorf1@llnl.gov>
Ported-by: Matthew Ahrens <mahrens@delphix.com>

spa_sync() iterates over all the dirty dnodes and processes each of them
by calling dnode_sync(). If there are many dirty dnodes (e.g. because we
created or removed a lot of files), the single thread of spa_sync()
calling dnode_sync() can become a bottleneck. Additionally, if many
dnodes are dirtied concurrently in open context (e.g. due to concurrent
file creation), the os_lock will experience lock contention via
dnode_setdirty().

The solution is to track dirty dnodes on a multilist_t, and for
spa_sync() to use separate threads to process each of the sublists in
the multilist.

OpenZFS-issue: https://www.illumos.org/issues/7968
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/4a2a54c
Closes #5752
This commit is contained in:
Matthew Ahrens
2017-03-20 18:36:00 -07:00
committed by Brian Behlendorf
parent a3478c0747
commit 64fc776208
16 changed files with 303 additions and 159 deletions
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include/sys/dsl_pool.h
+2 -1
View File
@@ -20,7 +20,7 @@
*/
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2013 by Delphix. All rights reserved.
* Copyright (c) 2013, 2017 by Delphix. All rights reserved.
* Copyright 2016 Nexenta Systems, Inc. All rights reserved.
*/
@@ -124,6 +124,7 @@ typedef struct dsl_pool {
txg_list_t dp_dirty_zilogs;
txg_list_t dp_dirty_dirs;
txg_list_t dp_sync_tasks;
taskq_t *dp_sync_taskq;
/*
* Protects administrative changes (properties, namespace)