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ea400129c3
- Avoid atomic_add() when updating as_lower_bound/as_upper_bound. Previous code was excessively strong on 64bit systems while not strong enough on 32bit ones. Instead introduce and use real atomic_load() and atomic_store() operations, just an assignments on 64bit machines, but using proper atomics on 32bit ones to avoid torn reads/writes. - Reduce number of buckets on large systems. Extra buckets not as much improve add speed, as hurt reads. Unlike wmsum for aggsum reads are still important. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Ryan Moeller <ryan@iXsystems.com> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored-By: iXsystems, Inc. Closes #12145
61 lines
1.3 KiB
C
61 lines
1.3 KiB
C
/*
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* CDDL HEADER START
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*
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* This file and its contents are supplied under the terms of the
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* Common Development and Distribution License ("CDDL"), version 1.0.
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* You may only use this file in accordance with the terms of version
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* 1.0 of the CDDL.
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*
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* A full copy of the text of the CDDL should have accompanied this
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* source. A copy of the CDDL is also available via the Internet at
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* http://www.illumos.org/license/CDDL.
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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) 2017 by Delphix. All rights reserved.
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*/
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#ifndef _SYS_AGGSUM_H
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#define _SYS_AGGSUM_H
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#include <sys/zfs_context.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct aggsum_bucket aggsum_bucket_t;
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struct aggsum_bucket {
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kmutex_t asc_lock;
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int64_t asc_delta;
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uint64_t asc_borrowed;
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} ____cacheline_aligned;
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/*
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* Fan out over FANOUT cpus.
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*/
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typedef struct aggsum {
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kmutex_t as_lock;
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int64_t as_lower_bound;
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uint64_t as_upper_bound;
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aggsum_bucket_t *as_buckets ____cacheline_aligned;
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uint_t as_numbuckets;
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uint_t as_bucketshift;
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} aggsum_t;
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void aggsum_init(aggsum_t *, uint64_t);
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void aggsum_fini(aggsum_t *);
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int64_t aggsum_lower_bound(aggsum_t *);
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uint64_t aggsum_upper_bound(aggsum_t *);
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int aggsum_compare(aggsum_t *, uint64_t);
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uint64_t aggsum_value(aggsum_t *);
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void aggsum_add(aggsum_t *, int64_t);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_AGGSUM_H */
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