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Today zfs tries to allocate blocks evenly across all devices. This means when devices are imbalanced zfs will use lots of CPU searching for space on devices which tend to be pretty full. It should instead fail quickly on the full LUNs and move onto devices which have more availability. Reviewed by: Eric Schrock <Eric.Schrock@delphix.com> Reviewed by: Matt Ahrens <Matt.Ahrens@delphix.com> Reviewed by: Adam Leventhal <Adam.Leventhal@delphix.com> Reviewed by: Albert Lee <trisk@nexenta.com> Reviewed by: Gordon Ross <gwr@nexenta.com> Approved by: Garrett D'Amore <garrett@nexenta.com> References to Illumos issue and patch: - https://www.illumos.org/issues/510 - https://github.com/illumos/illumos-gate/commit/5ead3ed965 Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #340
92 lines
2.9 KiB
C
92 lines
2.9 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 2009 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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* Copyright (c) 2011 by Delphix. All rights reserved.
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*/
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#ifndef _SYS_METASLAB_IMPL_H
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#define _SYS_METASLAB_IMPL_H
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#include <sys/metaslab.h>
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#include <sys/space_map.h>
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#include <sys/vdev.h>
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#include <sys/txg.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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struct metaslab_class {
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spa_t *mc_spa;
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metaslab_group_t *mc_rotor;
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space_map_ops_t *mc_ops;
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uint64_t mc_aliquot;
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uint64_t mc_alloc; /* total allocated space */
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uint64_t mc_deferred; /* total deferred frees */
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uint64_t mc_space; /* total space (alloc + free) */
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uint64_t mc_dspace; /* total deflated space */
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};
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struct metaslab_group {
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kmutex_t mg_lock;
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avl_tree_t mg_metaslab_tree;
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uint64_t mg_aliquot;
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uint64_t mg_bonus_area;
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uint64_t mg_alloc_failures;
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int64_t mg_bias;
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int64_t mg_activation_count;
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metaslab_class_t *mg_class;
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vdev_t *mg_vd;
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metaslab_group_t *mg_prev;
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metaslab_group_t *mg_next;
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};
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/*
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* Each metaslab's free space is tracked in space map object in the MOS,
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* which is only updated in syncing context. Each time we sync a txg,
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* we append the allocs and frees from that txg to the space map object.
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* When the txg is done syncing, metaslab_sync_done() updates ms_smo
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* to ms_smo_syncing. Everything in ms_smo is always safe to allocate.
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*/
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struct metaslab {
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kmutex_t ms_lock; /* metaslab lock */
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space_map_obj_t ms_smo; /* synced space map object */
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space_map_obj_t ms_smo_syncing; /* syncing space map object */
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space_map_t ms_allocmap[TXG_SIZE]; /* allocated this txg */
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space_map_t ms_freemap[TXG_SIZE]; /* freed this txg */
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space_map_t ms_defermap[TXG_DEFER_SIZE]; /* deferred frees */
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space_map_t ms_map; /* in-core free space map */
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int64_t ms_deferspace; /* sum of ms_defermap[] space */
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uint64_t ms_weight; /* weight vs. others in group */
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metaslab_group_t *ms_group; /* metaslab group */
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avl_node_t ms_group_node; /* node in metaslab group tree */
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txg_node_t ms_txg_node; /* per-txg dirty metaslab links */
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};
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_METASLAB_IMPL_H */
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