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0cee24064a
FreeBSD #xxx: Dramatically optimize listing snapshots when user
requests only snapshot names and wants to sort them by name, ie.
when executes:
# zfs list -t snapshot -o name -s name
Because only name is needed we don't have to read all snapshot
properties.
Below you can find how long does it take to list 34509 snapshots
from a single disk pool before and after this change with cold and
warm cache:
before:
# time zfs list -t snapshot -o name -s name > /dev/null
cold cache: 525s
warm cache: 218s
after:
# time zfs list -t snapshot -o name -s name > /dev/null
cold cache: 1.7s
warm cache: 1.1s
NOTE: This patch only appears in FreeBSD. If/when Illumos picks up
the change we may want to drop this patch and adopt their version.
However, for now this addresses a real issue.
Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #450
59 lines
1.8 KiB
C
59 lines
1.8 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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*/
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#ifndef ZFS_ITER_H
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#define ZFS_ITER_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct zfs_sort_column {
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struct zfs_sort_column *sc_next;
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struct zfs_sort_column *sc_last;
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zfs_prop_t sc_prop;
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char *sc_user_prop;
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boolean_t sc_reverse;
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} zfs_sort_column_t;
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#define ZFS_ITER_RECURSE (1 << 0)
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#define ZFS_ITER_ARGS_CAN_BE_PATHS (1 << 1)
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#define ZFS_ITER_PROP_LISTSNAPS (1 << 2)
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#define ZFS_ITER_DEPTH_LIMIT (1 << 3)
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#define ZFS_ITER_RECVD_PROPS (1 << 4)
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#define ZFS_ITER_SIMPLE (1 << 5)
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int zfs_for_each(int, char **, int options, zfs_type_t,
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zfs_sort_column_t *, zprop_list_t **, int, zfs_iter_f, void *);
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int zfs_add_sort_column(zfs_sort_column_t **, const char *, boolean_t);
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void zfs_free_sort_columns(zfs_sort_column_t *);
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int zfs_sort_only_by_name(const zfs_sort_column_t *);
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#ifdef __cplusplus
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}
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#endif
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#endif /* ZFS_ITER_H */
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