Speed up 'zfs list -t snapshot -o name -s name'
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
This commit is contained in:
Pawel Jakub Dawidek
Brian Behlendorf
parent
74497b7ab6
commit
0cee24064a
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@ -20,6 +20,7 @@
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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) 2012 Pawel Jakub Dawidek <pawel@dawidek.net>.
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*/
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#include <libintl.h>
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@ -129,8 +130,11 @@ zfs_callback(zfs_handle_t *zhp, void *data)
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cb->cb_depth++;
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if (zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM)
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(void) zfs_iter_filesystems(zhp, zfs_callback, data);
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if ((zfs_get_type(zhp) != ZFS_TYPE_SNAPSHOT) && include_snaps)
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(void) zfs_iter_snapshots(zhp, zfs_callback, data);
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if ((zfs_get_type(zhp) != ZFS_TYPE_SNAPSHOT) && include_snaps) {
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(void) zfs_iter_snapshots(zhp,
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(cb->cb_flags & ZFS_ITER_SIMPLE) != 0, zfs_callback,
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data);
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}
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cb->cb_depth--;
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}
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@ -184,6 +188,13 @@ zfs_free_sort_columns(zfs_sort_column_t *sc)
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}
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}
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int
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zfs_sort_only_by_name(const zfs_sort_column_t *sc)
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{
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return (sc != NULL && sc->sc_next == NULL &&
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sc->sc_prop == ZFS_PROP_NAME);
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}
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/* ARGSUSED */
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static int
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zfs_compare(const void *larg, const void *rarg, void *unused)
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@ -224,7 +235,13 @@ zfs_compare(const void *larg, const void *rarg, void *unused)
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lcreate = zfs_prop_get_int(l, ZFS_PROP_CREATETXG);
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rcreate = zfs_prop_get_int(r, ZFS_PROP_CREATETXG);
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if (lcreate < rcreate)
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/*
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* Both lcreate and rcreate being 0 means we don't have
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* properties and we should compare full name.
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*/
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if (lcreate == 0 && rcreate == 0)
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ret = strcmp(lat + 1, rat + 1);
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else if (lcreate < rcreate)
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ret = -1;
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else if (lcreate > rcreate)
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ret = 1;
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@ -290,7 +307,14 @@ zfs_sort(const void *larg, const void *rarg, void *data)
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if (rvalid)
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verify(nvlist_lookup_string(rval,
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ZPROP_VALUE, &rstr) == 0);
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} else if (psc->sc_prop == ZFS_PROP_NAME) {
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lvalid = rvalid = B_TRUE;
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(void) strlcpy(lbuf, zfs_get_name(l), sizeof(lbuf));
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(void) strlcpy(rbuf, zfs_get_name(r), sizeof(rbuf));
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lstr = lbuf;
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rstr = rbuf;
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} else if (zfs_prop_is_string(psc->sc_prop)) {
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lvalid = (zfs_prop_get(l, psc->sc_prop, lbuf,
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sizeof (lbuf), NULL, NULL, 0, B_TRUE) == 0);
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@ -43,11 +43,13 @@ typedef struct zfs_sort_column {
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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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@ -2650,7 +2650,12 @@ print_dataset(zfs_handle_t *zhp, zprop_list_t *pl, boolean_t scripted)
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first = B_FALSE;
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}
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if (pl->pl_prop != ZPROP_INVAL) {
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if (pl->pl_prop == ZFS_PROP_NAME) {
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(void) strlcpy(property, zfs_get_name(zhp),
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sizeof(property));
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propstr = property;
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right_justify = zfs_prop_align_right(pl->pl_prop);
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} else if (pl->pl_prop != ZPROP_INVAL) {
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if (zfs_prop_get(zhp, pl->pl_prop, property,
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sizeof (property), NULL, NULL, 0, B_FALSE) != 0)
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propstr = "-";
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@ -2810,6 +2815,13 @@ zfs_do_list(int argc, char **argv)
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if (fields == NULL)
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fields = default_fields;
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/*
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* If we are only going to list snapshot names and sort by name,
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* then we can use faster version.
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*/
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if (strcmp(fields, "name") == 0 && zfs_sort_only_by_name(sortcol))
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flags |= ZFS_ITER_SIMPLE;
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/*
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* If "-o space" and no types were specified, don't display snapshots.
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*/
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@ -516,7 +516,7 @@ extern int zfs_iter_root(libzfs_handle_t *, zfs_iter_f, void *);
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extern int zfs_iter_children(zfs_handle_t *, zfs_iter_f, void *);
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extern int zfs_iter_dependents(zfs_handle_t *, boolean_t, zfs_iter_f, void *);
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extern int zfs_iter_filesystems(zfs_handle_t *, zfs_iter_f, void *);
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extern int zfs_iter_snapshots(zfs_handle_t *, zfs_iter_f, void *);
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extern int zfs_iter_snapshots(zfs_handle_t *, boolean_t, zfs_iter_f, void *);
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extern int zfs_iter_snapshots_sorted(zfs_handle_t *, zfs_iter_f, void *);
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typedef struct get_all_cb {
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@ -286,7 +286,8 @@ typedef struct zfs_cmd {
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boolean_t zc_temphold;
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uint64_t zc_action_handle;
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int zc_cleanup_fd;
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uint8_t zc_pad[4]; /* alignment */
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uint8_t zc_simple;
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uint8_t zc_pad[3]; /* alignment */
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uint64_t zc_sendobj;
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uint64_t zc_fromobj;
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uint64_t zc_createtxg;
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@ -23,6 +23,7 @@
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2010 Nexenta Systems, Inc. All rights reserved.
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* Copyright (c) 2011 by Delphix. All rights reserved.
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* Copyright (c) 2012 Pawel Jakub Dawidek <pawel@dawidek.net>.
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*/
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#include <ctype.h>
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@ -480,6 +481,23 @@ make_dataset_handle_zc(libzfs_handle_t *hdl, zfs_cmd_t *zc)
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return (zhp);
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}
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static zfs_handle_t *
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make_dataset_simple_handle_zc(zfs_handle_t *pzhp, zfs_cmd_t *zc)
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{
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zfs_handle_t *zhp = calloc(sizeof (zfs_handle_t), 1);
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if (zhp == NULL)
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return (NULL);
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zhp->zfs_hdl = pzhp->zfs_hdl;
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(void) strlcpy(zhp->zfs_name, zc->zc_name, sizeof (zhp->zfs_name));
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zhp->zfs_head_type = pzhp->zfs_type;
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zhp->zfs_type = ZFS_TYPE_SNAPSHOT;
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zhp->zpool_hdl = zpool_handle(zhp);
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return (zhp);
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}
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/*
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* Opens the given snapshot, filesystem, or volume. The 'types'
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* argument is a mask of acceptable types. The function will print an
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@ -2518,7 +2536,8 @@ zfs_iter_filesystems(zfs_handle_t *zhp, zfs_iter_f func, void *data)
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* Iterate over all snapshots
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*/
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int
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zfs_iter_snapshots(zfs_handle_t *zhp, zfs_iter_f func, void *data)
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zfs_iter_snapshots(zfs_handle_t *zhp, boolean_t simple, zfs_iter_f func,
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void *data)
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{
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zfs_cmd_t zc = { "\0", "\0", "\0", "\0", 0 };
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zfs_handle_t *nzhp;
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@ -2527,15 +2546,19 @@ zfs_iter_snapshots(zfs_handle_t *zhp, zfs_iter_f func, void *data)
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if (zhp->zfs_type == ZFS_TYPE_SNAPSHOT)
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return (0);
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zc.zc_simple = simple;
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if (zcmd_alloc_dst_nvlist(zhp->zfs_hdl, &zc, 0) != 0)
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return (-1);
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while ((ret = zfs_do_list_ioctl(zhp, ZFS_IOC_SNAPSHOT_LIST_NEXT,
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&zc)) == 0) {
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if ((nzhp = make_dataset_handle_zc(zhp->zfs_hdl,
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&zc)) == NULL) {
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if (simple)
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nzhp = make_dataset_simple_handle_zc(zhp, &zc);
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else
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nzhp = make_dataset_handle_zc(zhp->zfs_hdl, &zc);
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if (nzhp == NULL)
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continue;
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}
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if ((ret = func(nzhp, data)) != 0) {
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zcmd_free_nvlists(&zc);
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@ -2557,7 +2580,7 @@ zfs_iter_children(zfs_handle_t *zhp, zfs_iter_f func, void *data)
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if ((ret = zfs_iter_filesystems(zhp, func, data)) != 0)
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return (ret);
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return (zfs_iter_snapshots(zhp, func, data));
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return (zfs_iter_snapshots(zhp, B_FALSE, func, data));
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}
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/*
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@ -3287,7 +3310,7 @@ zfs_promote(zfs_handle_t *zhp)
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return (-1);
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(void) zfs_prop_get(pzhp, ZFS_PROP_MOUNTPOINT, pd.cb_mountpoint,
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sizeof (pd.cb_mountpoint), NULL, NULL, 0, FALSE);
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ret = zfs_iter_snapshots(pzhp, promote_snap_cb, &pd);
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ret = zfs_iter_snapshots(pzhp, B_FALSE, promote_snap_cb, &pd);
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if (ret != 0) {
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zfs_close(pzhp);
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return (-1);
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@ -3302,7 +3325,8 @@ zfs_promote(zfs_handle_t *zhp)
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if (ret != 0) {
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int save_errno = errno;
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(void) zfs_iter_snapshots(pzhp, promote_snap_done_cb, &pd);
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(void) zfs_iter_snapshots(pzhp, B_FALSE, promote_snap_done_cb,
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&pd);
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zfs_close(pzhp);
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switch (save_errno) {
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@ -3321,7 +3345,8 @@ zfs_promote(zfs_handle_t *zhp)
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return (zfs_standard_error(hdl, save_errno, errbuf));
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}
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} else {
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(void) zfs_iter_snapshots(zhp, promote_snap_done_cb, &pd);
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(void) zfs_iter_snapshots(zhp, B_FALSE, promote_snap_done_cb,
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&pd);
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}
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zfs_close(pzhp);
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@ -21,6 +21,8 @@
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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) 2012 Pawel Jakub Dawidek <pawel@dawidek.net>.
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* All rights reserved
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*/
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#include <assert.h>
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@ -717,7 +719,7 @@ send_iterate_fs(zfs_handle_t *zhp, void *arg)
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sd->parent_fromsnap_guid = 0;
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VERIFY(0 == nvlist_alloc(&sd->parent_snaps, NV_UNIQUE_NAME, 0));
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VERIFY(0 == nvlist_alloc(&sd->snapprops, NV_UNIQUE_NAME, 0));
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(void) zfs_iter_snapshots(zhp, send_iterate_snap, sd);
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(void) zfs_iter_snapshots(zhp, B_FALSE, send_iterate_snap, sd);
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VERIFY(0 == nvlist_add_nvlist(nvfs, "snaps", sd->parent_snaps));
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VERIFY(0 == nvlist_add_nvlist(nvfs, "snapprops", sd->snapprops));
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nvlist_free(sd->parent_snaps);
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@ -843,7 +845,7 @@ zfs_iter_snapshots_sorted(zfs_handle_t *zhp, zfs_iter_f callback, void *data)
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avl_create(&avl, zfs_snapshot_compare,
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sizeof (zfs_node_t), offsetof(zfs_node_t, zn_avlnode));
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ret = zfs_iter_snapshots(zhp, zfs_sort_snaps, &avl);
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ret = zfs_iter_snapshots(zhp, B_FALSE, zfs_sort_snaps, &avl);
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for (node = avl_first(&avl); node != NULL; node = AVL_NEXT(&avl, node))
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ret |= callback(node->zn_handle, data);
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@ -21,6 +21,7 @@
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/*
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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* Portions Copyright 2011 Martin Matuska
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* Portions Copyright 2012 Pawel Jakub Dawidek <pawel@dawidek.net>
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* Copyright (c) 2012, Joyent, Inc. All rights reserved.
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*/
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@ -1973,7 +1974,7 @@ zfs_ioc_snapshot_list_next(zfs_cmd_t *zc)
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int error;
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top:
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if (zc->zc_cookie == 0)
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if (zc->zc_cookie == 0 && !zc->zc_simple)
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(void) dmu_objset_find(zc->zc_name, dmu_objset_prefetch,
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NULL, DS_FIND_SNAPSHOTS);
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@ -1995,7 +1996,7 @@ top:
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zc->zc_name + strlen(zc->zc_name), &zc->zc_obj, &zc->zc_cookie,
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NULL);
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if (error == 0) {
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if (error == 0 && !zc->zc_simple) {
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dsl_dataset_t *ds;
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dsl_pool_t *dp = os->os_dsl_dataset->ds_dir->dd_pool;
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