1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or https://opensource.org/licenses/CDDL-1.0. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved. 24 * Copyright (c) 2012, 2016 by Delphix. All rights reserved. 25 * Copyright (c) 2022 by Pawel Jakub Dawidek 26 * Copyright (c) 2023, Klara Inc. 27 */ 28 29 #include <sys/zfs_context.h> 30 #include <sys/spa.h> 31 #include <sys/spa_impl.h> 32 #include <sys/ddt.h> 33 #include <sys/ddt_impl.h> 34 35 static void 36 ddt_stat_generate(ddt_t *ddt, ddt_entry_t *dde, ddt_stat_t *dds) 37 { 38 spa_t *spa = ddt->ddt_spa; 39 ddt_phys_t *ddp = dde->dde_phys; 40 ddt_key_t *ddk = &dde->dde_key; 41 uint64_t lsize = DDK_GET_LSIZE(ddk); 42 uint64_t psize = DDK_GET_PSIZE(ddk); 43 44 memset(dds, 0, sizeof (*dds)); 45 46 for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) { 47 uint64_t dsize = 0; 48 uint64_t refcnt = ddp->ddp_refcnt; 49 50 if (ddp->ddp_phys_birth == 0) 51 continue; 52 53 int ndvas = DDK_GET_CRYPT(&dde->dde_key) ? 54 SPA_DVAS_PER_BP - 1 : SPA_DVAS_PER_BP; 55 for (int d = 0; d < ndvas; d++) 56 dsize += dva_get_dsize_sync(spa, &ddp->ddp_dva[d]); 57 58 dds->dds_blocks += 1; 59 dds->dds_lsize += lsize; 60 dds->dds_psize += psize; 61 dds->dds_dsize += dsize; 62 63 dds->dds_ref_blocks += refcnt; 64 dds->dds_ref_lsize += lsize * refcnt; 65 dds->dds_ref_psize += psize * refcnt; 66 dds->dds_ref_dsize += dsize * refcnt; 67 } 68 } 69 70 void 71 ddt_stat_add(ddt_stat_t *dst, const ddt_stat_t *src, uint64_t neg) 72 { 73 const uint64_t *s = (const uint64_t *)src; 74 uint64_t *d = (uint64_t *)dst; 75 uint64_t *d_end = (uint64_t *)(dst + 1); 76 77 ASSERT(neg == 0 || neg == -1ULL); /* add or subtract */ 78 79 for (int i = 0; i < d_end - d; i++) 80 d[i] += (s[i] ^ neg) - neg; 81 } 82 83 void 84 ddt_stat_update(ddt_t *ddt, ddt_entry_t *dde, uint64_t neg) 85 { 86 ddt_stat_t dds; 87 ddt_histogram_t *ddh; 88 int bucket; 89 90 ddt_stat_generate(ddt, dde, &dds); 91 92 bucket = highbit64(dds.dds_ref_blocks) - 1; 93 ASSERT3U(bucket, >=, 0); 94 95 ddh = &ddt->ddt_histogram[dde->dde_type][dde->dde_class]; 96 97 ddt_stat_add(&ddh->ddh_stat[bucket], &dds, neg); 98 } 99 100 void 101 ddt_histogram_add(ddt_histogram_t *dst, const ddt_histogram_t *src) 102 { 103 for (int h = 0; h < 64; h++) 104 ddt_stat_add(&dst->ddh_stat[h], &src->ddh_stat[h], 0); 105 } 106 107 void 108 ddt_histogram_stat(ddt_stat_t *dds, const ddt_histogram_t *ddh) 109 { 110 memset(dds, 0, sizeof (*dds)); 111 112 for (int h = 0; h < 64; h++) 113 ddt_stat_add(dds, &ddh->ddh_stat[h], 0); 114 } 115 116 boolean_t 117 ddt_histogram_empty(const ddt_histogram_t *ddh) 118 { 119 const uint64_t *s = (const uint64_t *)ddh; 120 const uint64_t *s_end = (const uint64_t *)(ddh + 1); 121 122 while (s < s_end) 123 if (*s++ != 0) 124 return (B_FALSE); 125 126 return (B_TRUE); 127 } 128 129 void 130 ddt_get_dedup_object_stats(spa_t *spa, ddt_object_t *ddo_total) 131 { 132 /* Sum the statistics we cached in ddt_object_sync(). */ 133 for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) { 134 ddt_t *ddt = spa->spa_ddt[c]; 135 if (!ddt) 136 continue; 137 138 for (ddt_type_t type = 0; type < DDT_TYPES; type++) { 139 for (ddt_class_t class = 0; class < DDT_CLASSES; 140 class++) { 141 ddt_object_t *ddo = 142 &ddt->ddt_object_stats[type][class]; 143 ddo_total->ddo_count += ddo->ddo_count; 144 ddo_total->ddo_dspace += ddo->ddo_dspace; 145 ddo_total->ddo_mspace += ddo->ddo_mspace; 146 } 147 } 148 } 149 150 /* ... and compute the averages. */ 151 if (ddo_total->ddo_count != 0) { 152 ddo_total->ddo_dspace /= ddo_total->ddo_count; 153 ddo_total->ddo_mspace /= ddo_total->ddo_count; 154 } 155 } 156 157 void 158 ddt_get_dedup_histogram(spa_t *spa, ddt_histogram_t *ddh) 159 { 160 for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) { 161 ddt_t *ddt = spa->spa_ddt[c]; 162 if (!ddt) 163 continue; 164 165 for (ddt_type_t type = 0; type < DDT_TYPES; type++) { 166 for (ddt_class_t class = 0; class < DDT_CLASSES; 167 class++) { 168 ddt_histogram_add(ddh, 169 &ddt->ddt_histogram_cache[type][class]); 170 } 171 } 172 } 173 } 174 175 void 176 ddt_get_dedup_stats(spa_t *spa, ddt_stat_t *dds_total) 177 { 178 ddt_histogram_t *ddh_total; 179 180 ddh_total = kmem_zalloc(sizeof (ddt_histogram_t), KM_SLEEP); 181 ddt_get_dedup_histogram(spa, ddh_total); 182 ddt_histogram_stat(dds_total, ddh_total); 183 kmem_free(ddh_total, sizeof (ddt_histogram_t)); 184 } 185 186 uint64_t 187 ddt_get_dedup_dspace(spa_t *spa) 188 { 189 ddt_stat_t dds_total; 190 191 if (spa->spa_dedup_dspace != ~0ULL) 192 return (spa->spa_dedup_dspace); 193 194 memset(&dds_total, 0, sizeof (ddt_stat_t)); 195 196 /* Calculate and cache the stats */ 197 ddt_get_dedup_stats(spa, &dds_total); 198 spa->spa_dedup_dspace = dds_total.dds_ref_dsize - dds_total.dds_dsize; 199 return (spa->spa_dedup_dspace); 200 } 201 202 uint64_t 203 ddt_get_pool_dedup_ratio(spa_t *spa) 204 { 205 ddt_stat_t dds_total = { 0 }; 206 207 ddt_get_dedup_stats(spa, &dds_total); 208 if (dds_total.dds_dsize == 0) 209 return (100); 210 211 return (dds_total.dds_ref_dsize * 100 / dds_total.dds_dsize); 212 } 213