diff options
| author | Garrett D'Amore <[email protected]> | 2011-11-07 16:26:52 -0800 |
|---|---|---|
| committer | Brian Behlendorf <[email protected]> | 2011-12-14 09:19:30 -0800 |
| commit | a38718a63d79116d6cb614dd2821e2a3955e5c8c (patch) | |
| tree | 05bdaf166ff065cedd2951380d92c65c7545b9cd /include/sys/zio.h | |
| parent | 30a9524e45f76d4c7860bcbf5567aeaa8aeb7a82 (diff) | |
Illumos #734: Use taskq_dispatch_ent() interface
It has been observed that some of the hottest locks are those
of the zio taskqs. Contention on these locks can limit the
rate at which zios are dispatched which limits performance.
This upstream change from Illumos uses new interface to the
taskqs which allow them to utilize a prealloc'ed taskq_ent_t.
This removes the need to perform an allocation at dispatch
time while holding the contended lock. This has the effect
of improving system performance.
Reviewed by: Albert Lee <[email protected]>
Reviewed by: Richard Lowe <[email protected]>
Reviewed by: Alexey Zaytsev <[email protected]>
Reviewed by: Jason Brian King <[email protected]>
Reviewed by: George Wilson <[email protected]>
Reviewed by: Adam Leventhal <[email protected]>
Approved by: Gordon Ross <[email protected]>
References to Illumos issue:
https://www.illumos.org/issues/734
Ported-by: Prakash Surya <[email protected]>
Signed-off-by: Brian Behlendorf <[email protected]>
Closes #482
Diffstat (limited to 'include/sys/zio.h')
| -rw-r--r-- | include/sys/zio.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/sys/zio.h b/include/sys/zio.h index a46918174..c0da4e2d7 100644 --- a/include/sys/zio.h +++ b/include/sys/zio.h @@ -22,6 +22,9 @@ /* * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. */ +/* + * Copyright 2011 Nexenta Systems, Inc. All rights reserved. + */ #ifndef _ZIO_H #define _ZIO_H @@ -423,6 +426,9 @@ struct zio { /* FMA state */ zio_cksum_report_t *io_cksum_report; uint64_t io_ena; + + /* Taskq dispatching state */ + taskq_ent_t io_tqent; }; extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd, |