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600a02b884
Previous flushing algorithm limited only total number of log blocks to the minimum of 256K and 4x number of metaslabs in the pool. As result, system with 1500 disks with 1000 metaslabs each, touching several new metaslabs each TXG could grow spacemap log to huge size without much benefits. We've observed one of such systems importing pool for about 45 minutes. This patch improves the situation from five sides: - By limiting maximum period for each metaslab to be flushed to 1000 TXGs, that effectively limits maximum number of per-TXG spacemap logs to load to the same number. - By making flushing more smooth via accounting number of metaslabs that were touched after the last flush and actually need another flush, not just ms_unflushed_txg bump. - By applying zfs_unflushed_log_block_pct to the number of metaslabs that were touched after the last flush, not all metaslabs in the pool. - By aggressively prefetching per-TXG spacemap logs up to 16 TXGs in advance, making log spacemap load process for wide HDD pool CPU-bound, accelerating it by many times. - By reducing zfs_unflushed_log_block_max from 256K to 128K, reducing single-threaded by nature log processing time from ~10 to ~5 minutes. As further optimization we could skip bumping ms_unflushed_txg for metaslabs not touched since the last flush, but that would be an incompatible change, requiring new pool feature. Reviewed-by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored-By: iXsystems, Inc. Closes #12789
152 lines
5.7 KiB
C
152 lines
5.7 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) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2011, 2018 by Delphix. All rights reserved.
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* Copyright (c) 2017, Intel Corporation.
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*/
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#ifndef _SYS_METASLAB_H
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#define _SYS_METASLAB_H
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#include <sys/spa.h>
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#include <sys/space_map.h>
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#include <sys/txg.h>
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#include <sys/zio.h>
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#include <sys/avl.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct metaslab_ops {
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uint64_t (*msop_alloc)(metaslab_t *, uint64_t);
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} metaslab_ops_t;
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extern const metaslab_ops_t zfs_metaslab_ops;
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int metaslab_init(metaslab_group_t *, uint64_t, uint64_t, uint64_t,
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metaslab_t **);
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void metaslab_fini(metaslab_t *);
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void metaslab_set_unflushed_dirty(metaslab_t *, boolean_t);
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void metaslab_set_unflushed_txg(metaslab_t *, uint64_t, dmu_tx_t *);
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void metaslab_set_estimated_condensed_size(metaslab_t *, uint64_t, dmu_tx_t *);
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boolean_t metaslab_unflushed_dirty(metaslab_t *);
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uint64_t metaslab_unflushed_txg(metaslab_t *);
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uint64_t metaslab_estimated_condensed_size(metaslab_t *);
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int metaslab_sort_by_flushed(const void *, const void *);
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void metaslab_unflushed_bump(metaslab_t *, dmu_tx_t *, boolean_t);
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uint64_t metaslab_unflushed_changes_memused(metaslab_t *);
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int metaslab_load(metaslab_t *);
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void metaslab_unload(metaslab_t *);
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boolean_t metaslab_flush(metaslab_t *, dmu_tx_t *);
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uint64_t metaslab_allocated_space(metaslab_t *);
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void metaslab_sync(metaslab_t *, uint64_t);
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void metaslab_sync_done(metaslab_t *, uint64_t);
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void metaslab_sync_reassess(metaslab_group_t *);
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uint64_t metaslab_largest_allocatable(metaslab_t *);
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/*
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* metaslab alloc flags
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*/
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#define METASLAB_HINTBP_FAVOR 0x0
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#define METASLAB_HINTBP_AVOID 0x1
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#define METASLAB_GANG_HEADER 0x2
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#define METASLAB_GANG_CHILD 0x4
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#define METASLAB_ASYNC_ALLOC 0x8
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#define METASLAB_DONT_THROTTLE 0x10
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#define METASLAB_MUST_RESERVE 0x20
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#define METASLAB_FASTWRITE 0x40
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#define METASLAB_ZIL 0x80
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int metaslab_alloc(spa_t *, metaslab_class_t *, uint64_t,
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blkptr_t *, int, uint64_t, blkptr_t *, int, zio_alloc_list_t *, zio_t *,
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int);
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int metaslab_alloc_dva(spa_t *, metaslab_class_t *, uint64_t,
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dva_t *, int, dva_t *, uint64_t, int, zio_alloc_list_t *, int);
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void metaslab_free(spa_t *, const blkptr_t *, uint64_t, boolean_t);
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void metaslab_free_concrete(vdev_t *, uint64_t, uint64_t, boolean_t);
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void metaslab_free_dva(spa_t *, const dva_t *, boolean_t);
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void metaslab_free_impl_cb(uint64_t, vdev_t *, uint64_t, uint64_t, void *);
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void metaslab_unalloc_dva(spa_t *, const dva_t *, uint64_t);
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int metaslab_claim(spa_t *, const blkptr_t *, uint64_t);
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int metaslab_claim_impl(vdev_t *, uint64_t, uint64_t, uint64_t);
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void metaslab_check_free(spa_t *, const blkptr_t *);
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void metaslab_fastwrite_mark(spa_t *, const blkptr_t *);
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void metaslab_fastwrite_unmark(spa_t *, const blkptr_t *);
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void metaslab_stat_init(void);
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void metaslab_stat_fini(void);
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void metaslab_trace_init(zio_alloc_list_t *);
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void metaslab_trace_fini(zio_alloc_list_t *);
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metaslab_class_t *metaslab_class_create(spa_t *, const metaslab_ops_t *);
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void metaslab_class_destroy(metaslab_class_t *);
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int metaslab_class_validate(metaslab_class_t *);
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void metaslab_class_histogram_verify(metaslab_class_t *);
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uint64_t metaslab_class_fragmentation(metaslab_class_t *);
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uint64_t metaslab_class_expandable_space(metaslab_class_t *);
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boolean_t metaslab_class_throttle_reserve(metaslab_class_t *, int, int,
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zio_t *, int);
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void metaslab_class_throttle_unreserve(metaslab_class_t *, int, int, zio_t *);
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void metaslab_class_evict_old(metaslab_class_t *, uint64_t);
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uint64_t metaslab_class_get_alloc(metaslab_class_t *);
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uint64_t metaslab_class_get_space(metaslab_class_t *);
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uint64_t metaslab_class_get_dspace(metaslab_class_t *);
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uint64_t metaslab_class_get_deferred(metaslab_class_t *);
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void metaslab_space_update(vdev_t *, metaslab_class_t *,
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int64_t, int64_t, int64_t);
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metaslab_group_t *metaslab_group_create(metaslab_class_t *, vdev_t *, int);
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void metaslab_group_destroy(metaslab_group_t *);
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void metaslab_group_activate(metaslab_group_t *);
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void metaslab_group_passivate(metaslab_group_t *);
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boolean_t metaslab_group_initialized(metaslab_group_t *);
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uint64_t metaslab_group_get_space(metaslab_group_t *);
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void metaslab_group_histogram_verify(metaslab_group_t *);
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uint64_t metaslab_group_fragmentation(metaslab_group_t *);
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void metaslab_group_histogram_remove(metaslab_group_t *, metaslab_t *);
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void metaslab_group_alloc_decrement(spa_t *, uint64_t, void *, int, int,
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boolean_t);
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void metaslab_group_alloc_verify(spa_t *, const blkptr_t *, void *, int);
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void metaslab_recalculate_weight_and_sort(metaslab_t *);
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void metaslab_disable(metaslab_t *);
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void metaslab_enable(metaslab_t *, boolean_t, boolean_t);
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void metaslab_set_selected_txg(metaslab_t *, uint64_t);
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extern int metaslab_debug_load;
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range_seg_type_t metaslab_calculate_range_tree_type(vdev_t *vdev,
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metaslab_t *msp, uint64_t *start, uint64_t *shift);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_METASLAB_H */
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