before: time zfs list -t snapshot -o name -s name > /dev/null cold cache: 552s warm cache: 223s no prefetch: time zfs list -t snapshot -o name -s name > /dev/null cold cache: 446s warm cache: 116s after: time zfs list -t snapshot -o name -s name > /dev/null cold cache: 1.7s warm cache: 1.1s Index: sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_ioctl.c =================================================================== --- sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_ioctl.c (wersja 228362) +++ sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_ioctl.c (kopia robocza) @@ -20,7 +20,7 @@ */ /* * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. - * Copyright (c) 2011 Pawel Jakub Dawidek . + * Copyright (c) 2011-2012 Pawel Jakub Dawidek . * All rights reserved. * Portions Copyright 2011 Martin Matuska * Copyright 2011 Nexenta Systems, Inc. All rights reserved. @@ -81,6 +81,12 @@ CTASSERT(sizeof(zfs_cmd_t) < IOCPARM_MAX); +static int snapshot_list_prefetch; +SYSCTL_DECL(_vfs_zfs); +TUNABLE_INT("vfs.zfs.snapshot_list_prefetch", &snapshot_list_prefetch); +SYSCTL_INT(_vfs_zfs, OID_AUTO, snapshot_list_prefetch, CTLFLAG_RW, + &snapshot_list_prefetch, 0, "Prefetch data when listing snapshots"); + static struct cdev *zfsdev; extern void zfs_init(void); @@ -2030,6 +2036,7 @@ * zc_name name of filesystem * zc_cookie zap cursor * zc_nvlist_dst_size size of buffer for property nvlist + * zc_simple when set, only name is requested * * outputs: * zc_name name of next snapshot @@ -2044,7 +2051,7 @@ int error; top: - if (zc->zc_cookie == 0) + if (snapshot_list_prefetch && zc->zc_cookie == 0 && !zc->zc_simple) (void) dmu_objset_find(zc->zc_name, dmu_objset_prefetch, NULL, DS_FIND_SNAPSHOTS); @@ -2066,7 +2073,7 @@ zc->zc_name + strlen(zc->zc_name), &zc->zc_obj, &zc->zc_cookie, NULL); - if (error == 0) { + if (error == 0 && !zc->zc_simple) { dsl_dataset_t *ds; dsl_pool_t *dp = os->os_dsl_dataset->ds_dir->dd_pool; Index: sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/zfs_ioctl.h =================================================================== --- sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/zfs_ioctl.h (wersja 230397) +++ sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/zfs_ioctl.h (kopia robocza) @@ -300,7 +300,8 @@ boolean_t zc_temphold; uint64_t zc_action_handle; int zc_cleanup_fd; - uint8_t zc_pad[4]; /* alignment */ + uint8_t zc_simple; + uint8_t zc_pad[3]; /* alignment */ uint64_t zc_sendobj; uint64_t zc_fromobj; uint64_t zc_createtxg; Index: cddl/contrib/opensolaris/cmd/zfs/zfs_iter.c =================================================================== --- cddl/contrib/opensolaris/cmd/zfs/zfs_iter.c (wersja 230437) +++ cddl/contrib/opensolaris/cmd/zfs/zfs_iter.c (kopia robocza) @@ -20,6 +20,8 @@ */ /* * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. + * Copyright (c) 2012 Pawel Jakub Dawidek . + * All rights reserved. */ #include @@ -129,8 +131,11 @@ cb->cb_depth++; if (zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) (void) zfs_iter_filesystems(zhp, zfs_callback, data); - if ((zfs_get_type(zhp) != ZFS_TYPE_SNAPSHOT) && include_snaps) - (void) zfs_iter_snapshots(zhp, zfs_callback, data); + if ((zfs_get_type(zhp) != ZFS_TYPE_SNAPSHOT) && include_snaps) { + (void) zfs_iter_snapshots(zhp, + (cb->cb_flags & ZFS_ITER_SIMPLE) != 0, zfs_callback, + data); + } cb->cb_depth--; } @@ -184,6 +189,14 @@ } } +boolean_t +zfs_sort_only_by_name(const zfs_sort_column_t *sc) +{ + + return (sc != NULL && sc->sc_next == NULL && + sc->sc_prop == ZFS_PROP_NAME); +} + /* ARGSUSED */ static int zfs_compare(const void *larg, const void *rarg, void *unused) @@ -224,7 +237,13 @@ lcreate = zfs_prop_get_int(l, ZFS_PROP_CREATETXG); rcreate = zfs_prop_get_int(r, ZFS_PROP_CREATETXG); - if (lcreate < rcreate) + /* + * Both lcreate and rcreate being 0 means we don't have + * properties and we should compare full name. + */ + if (lcreate == 0 && rcreate == 0) + ret = strcmp(lat + 1, rat + 1); + else if (lcreate < rcreate) ret = -1; else if (lcreate > rcreate) ret = 1; @@ -290,7 +309,14 @@ if (rvalid) verify(nvlist_lookup_string(rval, ZPROP_VALUE, &rstr) == 0); + } else if (psc->sc_prop == ZFS_PROP_NAME) { + lvalid = rvalid = B_TRUE; + (void) strlcpy(lbuf, zfs_get_name(l), sizeof(lbuf)); + (void) strlcpy(rbuf, zfs_get_name(r), sizeof(rbuf)); + + lstr = lbuf; + rstr = rbuf; } else if (zfs_prop_is_string(psc->sc_prop)) { lvalid = (zfs_prop_get(l, psc->sc_prop, lbuf, sizeof (lbuf), NULL, NULL, 0, B_TRUE) == 0); Index: cddl/contrib/opensolaris/cmd/zfs/zfs_main.c =================================================================== --- cddl/contrib/opensolaris/cmd/zfs/zfs_main.c (wersja 230437) +++ cddl/contrib/opensolaris/cmd/zfs/zfs_main.c (kopia robocza) @@ -23,7 +23,7 @@ * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. * Copyright 2011 Nexenta Systems, Inc. All rights reserved. * Copyright (c) 2011 by Delphix. All rights reserved. - * Copyright (c) 2011 Pawel Jakub Dawidek . + * Copyright (c) 2011-2012 Pawel Jakub Dawidek . * All rights reserved. * Copyright (c) 2011 Martin Matuska . All rights reserved. */ @@ -2838,7 +2838,12 @@ first = B_FALSE; } - if (pl->pl_prop != ZPROP_INVAL) { + if (pl->pl_prop == ZFS_PROP_NAME) { + (void) strlcpy(property, zfs_get_name(zhp), + sizeof(property)); + propstr = property; + right_justify = zfs_prop_align_right(pl->pl_prop); + } else if (pl->pl_prop != ZPROP_INVAL) { if (zfs_prop_get(zhp, pl->pl_prop, property, sizeof (property), NULL, NULL, 0, B_FALSE) != 0) propstr = "-"; @@ -3005,6 +3010,13 @@ fields = default_fields; /* + * If we are only going to list snapshot names and sort by name, + * then we can use faster version. + */ + if (strcmp(fields, "name") == 0 && zfs_sort_only_by_name(sortcol)) + flags |= ZFS_ITER_SIMPLE; + + /* * If "-o space" and no types were specified, don't display snapshots. */ if (strcmp(fields, "space") == 0 && types_specified == B_FALSE) Index: cddl/contrib/opensolaris/cmd/zfs/zfs_iter.h =================================================================== --- cddl/contrib/opensolaris/cmd/zfs/zfs_iter.h (wersja 230437) +++ cddl/contrib/opensolaris/cmd/zfs/zfs_iter.h (kopia robocza) @@ -43,11 +43,13 @@ #define ZFS_ITER_PROP_LISTSNAPS (1 << 2) #define ZFS_ITER_DEPTH_LIMIT (1 << 3) #define ZFS_ITER_RECVD_PROPS (1 << 4) +#define ZFS_ITER_SIMPLE (1 << 5) int zfs_for_each(int, char **, int options, zfs_type_t, zfs_sort_column_t *, zprop_list_t **, int, zfs_iter_f, void *); int zfs_add_sort_column(zfs_sort_column_t **, const char *, boolean_t); void zfs_free_sort_columns(zfs_sort_column_t *); +boolean_t zfs_sort_only_by_name(const zfs_sort_column_t *); #ifdef __cplusplus } Index: cddl/contrib/opensolaris/lib/libzfs/common/libzfs.h =================================================================== --- cddl/contrib/opensolaris/lib/libzfs/common/libzfs.h (wersja 230437) +++ cddl/contrib/opensolaris/lib/libzfs/common/libzfs.h (kopia robocza) @@ -507,7 +507,7 @@ extern int zfs_iter_children(zfs_handle_t *, zfs_iter_f, void *); extern int zfs_iter_dependents(zfs_handle_t *, boolean_t, zfs_iter_f, void *); extern int zfs_iter_filesystems(zfs_handle_t *, zfs_iter_f, void *); -extern int zfs_iter_snapshots(zfs_handle_t *, zfs_iter_f, void *); +extern int zfs_iter_snapshots(zfs_handle_t *, boolean_t, zfs_iter_f, void *); extern int zfs_iter_snapshots_sorted(zfs_handle_t *, zfs_iter_f, void *); extern int zfs_iter_snapspec(zfs_handle_t *, const char *, zfs_iter_f, void *); Index: cddl/contrib/opensolaris/lib/libzfs/common/libzfs_dataset.c =================================================================== --- cddl/contrib/opensolaris/lib/libzfs/common/libzfs_dataset.c (wersja 230437) +++ cddl/contrib/opensolaris/lib/libzfs/common/libzfs_dataset.c (kopia robocza) @@ -23,7 +23,7 @@ * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. * Copyright 2010 Nexenta Systems, Inc. All rights reserved. * Copyright (c) 2011 by Delphix. All rights reserved. - * Copyright (c) 2011 Pawel Jakub Dawidek . + * Copyright (c) 2011-2012 Pawel Jakub Dawidek . * All rights reserved. */ @@ -514,6 +514,22 @@ } zfs_handle_t * +make_dataset_simple_handle_zc(zfs_handle_t *pzhp, zfs_cmd_t *zc) +{ + zfs_handle_t *zhp = calloc(sizeof (zfs_handle_t), 1); + + if (zhp == NULL) + return (NULL); + + zhp->zfs_hdl = pzhp->zfs_hdl; + (void) strlcpy(zhp->zfs_name, zc->zc_name, sizeof (zhp->zfs_name)); + zhp->zfs_head_type = pzhp->zfs_type; + zhp->zfs_type = ZFS_TYPE_SNAPSHOT; + zhp->zpool_hdl = zpool_handle(zhp); + return (zhp); +} + +zfs_handle_t * zfs_handle_dup(zfs_handle_t *zhp_orig) { zfs_handle_t *zhp = calloc(sizeof (zfs_handle_t), 1); Index: cddl/contrib/opensolaris/lib/libzfs/common/libzfs_impl.h =================================================================== --- cddl/contrib/opensolaris/lib/libzfs/common/libzfs_impl.h (wersja 230437) +++ cddl/contrib/opensolaris/lib/libzfs/common/libzfs_impl.h (kopia robocza) @@ -150,8 +150,8 @@ int get_dependents(libzfs_handle_t *, boolean_t, const char *, char ***, size_t *); zfs_handle_t *make_dataset_handle_zc(libzfs_handle_t *, zfs_cmd_t *); +zfs_handle_t *make_dataset_simple_handle_zc(zfs_handle_t *, zfs_cmd_t *); - int zprop_parse_value(libzfs_handle_t *, nvpair_t *, int, zfs_type_t, nvlist_t *, char **, uint64_t *, const char *); int zprop_expand_list(libzfs_handle_t *hdl, zprop_list_t **plp, Index: cddl/contrib/opensolaris/lib/libzfs/common/libzfs_sendrecv.c =================================================================== --- cddl/contrib/opensolaris/lib/libzfs/common/libzfs_sendrecv.c (wersja 230437) +++ cddl/contrib/opensolaris/lib/libzfs/common/libzfs_sendrecv.c (kopia robocza) @@ -22,6 +22,8 @@ /* * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. * Copyright (c) 2011 by Delphix. All rights reserved. + * Copyright (c) 2012 Pawel Jakub Dawidek . + * All rights reserved. */ #include @@ -717,7 +719,7 @@ sd->parent_fromsnap_guid = 0; VERIFY(0 == nvlist_alloc(&sd->parent_snaps, NV_UNIQUE_NAME, 0)); VERIFY(0 == nvlist_alloc(&sd->snapprops, NV_UNIQUE_NAME, 0)); - (void) zfs_iter_snapshots(zhp, send_iterate_snap, sd); + (void) zfs_iter_snapshots(zhp, B_FALSE, send_iterate_snap, sd); VERIFY(0 == nvlist_add_nvlist(nvfs, "snaps", sd->parent_snaps)); VERIFY(0 == nvlist_add_nvlist(nvfs, "snapprops", sd->snapprops)); nvlist_free(sd->parent_snaps); Index: cddl/contrib/opensolaris/lib/libzfs/common/libzfs_iter.c =================================================================== --- cddl/contrib/opensolaris/lib/libzfs/common/libzfs_iter.c (wersja 230437) +++ cddl/contrib/opensolaris/lib/libzfs/common/libzfs_iter.c (kopia robocza) @@ -23,6 +23,8 @@ * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. * Copyright 2010 Nexenta Systems, Inc. All rights reserved. * Copyright (c) 2011 by Delphix. All rights reserved. + * Copyright (c) 2012 Pawel Jakub Dawidek . + * All rights reserved. */ #include @@ -137,7 +139,8 @@ * Iterate over all snapshots */ int -zfs_iter_snapshots(zfs_handle_t *zhp, zfs_iter_f func, void *data) +zfs_iter_snapshots(zfs_handle_t *zhp, boolean_t simple, zfs_iter_f func, + void *data) { zfs_cmd_t zc = { 0 }; zfs_handle_t *nzhp; @@ -146,15 +149,19 @@ if (zhp->zfs_type == ZFS_TYPE_SNAPSHOT) return (0); + zc.zc_simple = simple; + if (zcmd_alloc_dst_nvlist(zhp->zfs_hdl, &zc, 0) != 0) return (-1); while ((ret = zfs_do_list_ioctl(zhp, ZFS_IOC_SNAPSHOT_LIST_NEXT, &zc)) == 0) { - if ((nzhp = make_dataset_handle_zc(zhp->zfs_hdl, - &zc)) == NULL) { + if (simple) + nzhp = make_dataset_simple_handle_zc(zhp, &zc); + else + nzhp = make_dataset_handle_zc(zhp->zfs_hdl, &zc); + if (nzhp == NULL) continue; - } if ((ret = func(nzhp, data)) != 0) { zcmd_free_nvlists(&zc); @@ -234,7 +241,7 @@ avl_create(&avl, zfs_snapshot_compare, sizeof (zfs_node_t), offsetof(zfs_node_t, zn_avlnode)); - ret = zfs_iter_snapshots(zhp, zfs_sort_snaps, &avl); + ret = zfs_iter_snapshots(zhp, B_FALSE, zfs_sort_snaps, &avl); for (node = avl_first(&avl); node != NULL; node = AVL_NEXT(&avl, node)) ret |= callback(node->zn_handle, data); @@ -378,7 +385,7 @@ if ((ret = zfs_iter_filesystems(zhp, func, data)) != 0) return (ret); - return (zfs_iter_snapshots(zhp, func, data)); + return (zfs_iter_snapshots(zhp, B_FALSE, func, data)); } @@ -439,8 +446,10 @@ isf.next = ida->stack; ida->stack = &isf; err = zfs_iter_filesystems(zhp, iter_dependents_cb, ida); - if (err == 0) - err = zfs_iter_snapshots(zhp, iter_dependents_cb, ida); + if (err == 0) { + err = zfs_iter_snapshots(zhp, B_FALSE, + iter_dependents_cb, ida); + } ida->stack = isf.next; } if (!first && err == 0)