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e2af2acce3
The `abd_get_offset_*()` routines create an abd_t that references another abd_t, and doesn't allocate any pages/buffers of its own. In some workloads, these routines may be called frequently, to create many abd_t's representing small pieces of a single large abd_t. In particular, the upcoming RAIDZ Expansion project makes heavy use of these routines. This commit adds the ability for the caller to allocate and provide the abd_t struct to a variant of `abd_get_offset_*()`. This eliminates the cost of allocating the abd_t and performing the accounting associated with it (`abdstat_struct_size`). The RAIDZ/DRAID code uses this for the `rc_abd`, which references the zio's abd. The upcoming RAIDZ Expansion project will leverage this infrastructure to increase performance of reads post-expansion by around 50%. Additionally, some of the interfaces around creating and destroying abd_t's are cleaned up. Most significantly, the distinction between `abd_put()` and `abd_free()` is eliminated; all types of abd_t's are now disposed of with `abd_free()`. Reviewed-by: Brian Atkinson <batkinson@lanl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Matthew Ahrens <mahrens@delphix.com> Issue #8853 Closes #11439
113 lines
3.3 KiB
C
113 lines
3.3 KiB
C
/*
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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 http://www.opensolaris.org/os/licensing.
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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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* Copyright (c) 2014 by Chunwei Chen. All rights reserved.
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* Copyright (c) 2016, 2019 by Delphix. All rights reserved.
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*/
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#ifndef _ABD_IMPL_H
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#define _ABD_IMPL_H
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#include <sys/abd.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef enum abd_stats_op {
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ABDSTAT_INCR, /* Increase abdstat values */
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ABDSTAT_DECR /* Decrease abdstat values */
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} abd_stats_op_t;
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struct scatterlist; /* forward declaration */
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struct abd_iter {
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/* public interface */
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void *iter_mapaddr; /* addr corresponding to iter_pos */
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size_t iter_mapsize; /* length of data valid at mapaddr */
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/* private */
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abd_t *iter_abd; /* ABD being iterated through */
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size_t iter_pos;
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size_t iter_offset; /* offset in current sg/abd_buf, */
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/* abd_offset included */
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struct scatterlist *iter_sg; /* current sg */
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};
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extern abd_t *abd_zero_scatter;
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abd_t *abd_gang_get_offset(abd_t *, size_t *);
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abd_t *abd_alloc_struct(size_t);
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void abd_free_struct(abd_t *);
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/*
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* OS specific functions
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*/
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abd_t *abd_alloc_struct_impl(size_t);
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abd_t *abd_get_offset_scatter(abd_t *, abd_t *, size_t);
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void abd_free_struct_impl(abd_t *);
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void abd_alloc_chunks(abd_t *, size_t);
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void abd_free_chunks(abd_t *);
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boolean_t abd_size_alloc_linear(size_t);
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void abd_update_scatter_stats(abd_t *, abd_stats_op_t);
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void abd_update_linear_stats(abd_t *, abd_stats_op_t);
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void abd_verify_scatter(abd_t *);
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void abd_free_linear_page(abd_t *);
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/* OS specific abd_iter functions */
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void abd_iter_init(struct abd_iter *, abd_t *);
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boolean_t abd_iter_at_end(struct abd_iter *);
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void abd_iter_advance(struct abd_iter *, size_t);
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void abd_iter_map(struct abd_iter *);
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void abd_iter_unmap(struct abd_iter *);
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/*
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* Helper macros
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*/
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#define ABDSTAT(stat) (abd_stats.stat.value.ui64)
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#define ABDSTAT_INCR(stat, val) \
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atomic_add_64(&abd_stats.stat.value.ui64, (val))
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#define ABDSTAT_BUMP(stat) ABDSTAT_INCR(stat, 1)
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#define ABDSTAT_BUMPDOWN(stat) ABDSTAT_INCR(stat, -1)
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#define ABD_SCATTER(abd) (abd->abd_u.abd_scatter)
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#define ABD_LINEAR_BUF(abd) (abd->abd_u.abd_linear.abd_buf)
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#define ABD_GANG(abd) (abd->abd_u.abd_gang)
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#if defined(_KERNEL)
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#if defined(__FreeBSD__)
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#define abd_enter_critical(flags) critical_enter()
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#define abd_exit_critical(flags) critical_exit()
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#else
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#define abd_enter_critical(flags) local_irq_save(flags)
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#define abd_exit_critical(flags) local_irq_restore(flags)
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#endif
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#else /* !_KERNEL */
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#define abd_enter_critical(flags) ((void)0)
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#define abd_exit_critical(flags) ((void)0)
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* _ABD_IMPL_H */
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