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Before Direct I/O was implemented, I've implemented lighter version I called Uncached I/O. It uses normal DMU/ARC data path with some optimizations, but evicts data from caches as soon as possible and reasonable. Originally I wired it only to a primarycache property, but now completing the integration all the way up to the VFS. While Direct I/O has the lowest possible memory bandwidth usage, it also has a significant number of limitations. It require I/Os to be page aligned, does not allow speculative prefetch, etc. The Uncached I/O does not have those limitations, but instead require additional memory copy, though still one less than regular cached I/O. As such it should fill the gap in between. Considering this I've disabled annoying EINVAL errors on misaligned requests, adding a tunable for those who wants to test their applications. To pass the information between the layers I had to change a number of APIs. But as side effect upper layers can now control not only the caching, but also speculative prefetch. I haven't wired it to VFS yet, since it require looking on some OS specifics. But while there I've implemented speculative prefetch of indirect blocks for Direct I/O, controllable via all the same mechanisms. Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored by: iXsystems, Inc. Fixes #17027 Reviewed-by: Rob Norris <robn@despairlabs.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
42 lines
1.2 KiB
C
42 lines
1.2 KiB
C
// SPDX-License-Identifier: CDDL-1.0
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/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or https://opensource.org/licenses/CDDL-1.0.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Portions Copyright 2021 iXsystems, Inc.
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*/
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#ifndef _SYS_ZFS_RACCT_H
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#define _SYS_ZFS_RACCT_H
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#include <sys/types.h>
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#include <sys/spa.h>
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/*
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* Platform-dependent resource accounting hooks
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*/
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void zfs_racct_read(spa_t *spa, uint64_t size, uint64_t iops,
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dmu_flags_t flags);
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void zfs_racct_write(spa_t *spa, uint64_t size, uint64_t iops,
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dmu_flags_t flags);
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#endif /* _SYS_ZFS_RACCT_H */
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