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wmsum counters are a reduced version of aggsum counters, optimized for write-mostly scenarios. They do not provide optimized read functions, but instead allow much cheaper add function. The primary usage is infrequently read statistic counters, not requiring exact precision. The Linux implementation is directly mapped into percpu_counter KPI. The FreeBSD implementation is directly mapped into counter(9) KPI. In user-space due to lack of better implementation mapped to aggsum. Unfortunately neither Linux percpu_counter nor FreeBSD counter(9) provide sufficient functionality to completelly replace aggsum, so it still remains to be used for several hot counters. Reviewed-by: Paul Dagnelie <pcd@delphix.com> 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 #12114
76 lines
2.2 KiB
C
76 lines
2.2 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) 2018 by Delphix. All rights reserved.
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* Copyright (c) 2018 Datto Inc.
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*/
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#ifndef _SYS_DATASET_KSTATS_H
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#define _SYS_DATASET_KSTATS_H
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#include <sys/wmsum.h>
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#include <sys/dmu.h>
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#include <sys/kstat.h>
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typedef struct dataset_sum_stats_t {
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wmsum_t dss_writes;
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wmsum_t dss_nwritten;
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wmsum_t dss_reads;
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wmsum_t dss_nread;
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wmsum_t dss_nunlinks;
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wmsum_t dss_nunlinked;
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} dataset_sum_stats_t;
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typedef struct dataset_kstat_values {
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kstat_named_t dkv_ds_name;
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kstat_named_t dkv_writes;
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kstat_named_t dkv_nwritten;
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kstat_named_t dkv_reads;
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kstat_named_t dkv_nread;
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/*
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* nunlinks is initialized to the unlinked set size on mount and
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* is incremented whenever a new entry is added to the unlinked set
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*/
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kstat_named_t dkv_nunlinks;
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/*
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* nunlinked is initialized to zero on mount and is incremented when an
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* entry is removed from the unlinked set
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*/
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kstat_named_t dkv_nunlinked;
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} dataset_kstat_values_t;
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typedef struct dataset_kstats {
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dataset_sum_stats_t dk_sums;
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kstat_t *dk_kstats;
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} dataset_kstats_t;
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void dataset_kstats_create(dataset_kstats_t *, objset_t *);
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void dataset_kstats_destroy(dataset_kstats_t *);
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void dataset_kstats_update_write_kstats(dataset_kstats_t *, int64_t);
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void dataset_kstats_update_read_kstats(dataset_kstats_t *, int64_t);
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void dataset_kstats_update_nunlinks_kstat(dataset_kstats_t *, int64_t);
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void dataset_kstats_update_nunlinked_kstat(dataset_kstats_t *, int64_t);
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#endif /* _SYS_DATASET_KSTATS_H */
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