diff options
| author | Matthew Ahrens <[email protected]> | 2017-03-20 18:36:00 -0700 |
|---|---|---|
| committer | Brian Behlendorf <[email protected]> | 2017-03-20 18:36:00 -0700 |
| commit | 64fc776208ad14b0078b89317b0f3b24338e10c1 (patch) | |
| tree | b8c229ca8b052f3aa718a27b97c759a564c8fd78 /module/zfs/dnode_sync.c | |
| parent | a3478c074752610814f894375c3d947ece4938fe (diff) | |
OpenZFS 7968 - multi-threaded spa_sync()
Reviewed by: Pavel Zakharov <[email protected]>
Reviewed by: Brad Lewis <[email protected]>
Reviewed by: Saso Kiselkov <[email protected]>
Reviewed by: Brian Behlendorf <[email protected]>
Ported-by: Matthew Ahrens <[email protected]>
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
Diffstat (limited to 'module/zfs/dnode_sync.c')
| -rw-r--r-- | module/zfs/dnode_sync.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/module/zfs/dnode_sync.c b/module/zfs/dnode_sync.c index 9f3c6a2c7..742d962bc 100644 --- a/module/zfs/dnode_sync.c +++ b/module/zfs/dnode_sync.c @@ -21,7 +21,7 @@ /* * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. - * Copyright (c) 2012, 2016 by Delphix. All rights reserved. + * Copyright (c) 2012, 2017 by Delphix. All rights reserved. * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved. */ |