module/zfs/ddt_stats.c

   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
  34 static void
  35 ddt_stat_generate(ddt_t *ddt, ddt_entry_t *dde, ddt_stat_t *dds)
  36 {
  37         spa_t *spa = ddt->ddt_spa;
  38         ddt_phys_t *ddp = dde->dde_phys;
  39         ddt_key_t *ddk = &dde->dde_key;
  40         uint64_t lsize = DDK_GET_LSIZE(ddk);
  41         uint64_t psize = DDK_GET_PSIZE(ddk);
  42
  43         memset(dds, 0, sizeof (*dds));
  44
  45         for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) {
  46                 uint64_t dsize = 0;
  47                 uint64_t refcnt = ddp->ddp_refcnt;
  48
  49                 if (ddp->ddp_phys_birth == 0)
  50                         continue;
  51
  52                 int ndvas = DDK_GET_CRYPT(&dde->dde_key) ?
  53                     SPA_DVAS_PER_BP - 1 : SPA_DVAS_PER_BP;
  54                 for (int d = 0; d < ndvas; d++)
  55                         dsize += dva_get_dsize_sync(spa, &ddp->ddp_dva[d]);
  56
  57                 dds->dds_blocks += 1;
  58                 dds->dds_lsize += lsize;
  59                 dds->dds_psize += psize;
  60                 dds->dds_dsize += dsize;
  61
  62                 dds->dds_ref_blocks += refcnt;
  63                 dds->dds_ref_lsize += lsize * refcnt;
  64                 dds->dds_ref_psize += psize * refcnt;
  65                 dds->dds_ref_dsize += dsize * refcnt;
  66         }
  67 }
  68
  69 void
  70 ddt_stat_add(ddt_stat_t *dst, const ddt_stat_t *src, uint64_t neg)
  71 {
  72         const uint64_t *s = (const uint64_t *)src;
  73         uint64_t *d = (uint64_t *)dst;
  74         uint64_t *d_end = (uint64_t *)(dst + 1);
  75
  76         ASSERT(neg == 0 || neg == -1ULL);       /* add or subtract */
  77
  78         for (int i = 0; i < d_end - d; i++)
  79                 d[i] += (s[i] ^ neg) - neg;
  80 }
  81
  82 void
  83 ddt_stat_update(ddt_t *ddt, ddt_entry_t *dde, uint64_t neg)
  84 {
  85         ddt_stat_t dds;
  86         ddt_histogram_t *ddh;
  87         int bucket;
  88
  89         ddt_stat_generate(ddt, dde, &dds);
  90
  91         bucket = highbit64(dds.dds_ref_blocks) - 1;
  92         ASSERT3U(bucket, >=, 0);
  93
  94         ddh = &ddt->ddt_histogram[dde->dde_type][dde->dde_class];
  95
  96         ddt_stat_add(&ddh->ddh_stat[bucket], &dds, neg);
  97 }
  98
  99 void
 100 ddt_histogram_add(ddt_histogram_t *dst, const ddt_histogram_t *src)
 101 {
 102         for (int h = 0; h < 64; h++)
 103                 ddt_stat_add(&dst->ddh_stat[h], &src->ddh_stat[h], 0);
 104 }
 105
 106 void
 107 ddt_histogram_stat(ddt_stat_t *dds, const ddt_histogram_t *ddh)
 108 {
 109         memset(dds, 0, sizeof (*dds));
 110
 111         for (int h = 0; h < 64; h++)
 112                 ddt_stat_add(dds, &ddh->ddh_stat[h], 0);
 113 }
 114
 115 boolean_t
 116 ddt_histogram_empty(const ddt_histogram_t *ddh)
 117 {
 118         const uint64_t *s = (const uint64_t *)ddh;
 119         const uint64_t *s_end = (const uint64_t *)(ddh + 1);
 120
 121         while (s < s_end)
 122                 if (*s++ != 0)
 123                         return (B_FALSE);
 124
 125         return (B_TRUE);
 126 }
 127
 128 void
 129 ddt_get_dedup_object_stats(spa_t *spa, ddt_object_t *ddo_total)
 130 {
 131         /* Sum the statistics we cached in ddt_object_sync(). */
 132         for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) {
 133                 ddt_t *ddt = spa->spa_ddt[c];
 134                 for (enum ddt_type type = 0; type < DDT_TYPES; type++) {
 135                         for (enum ddt_class class = 0; class < DDT_CLASSES;
 136                             class++) {
 137                                 ddt_object_t *ddo =
 138                                     &ddt->ddt_object_stats[type][class];
 139                                 ddo_total->ddo_count += ddo->ddo_count;
 140                                 ddo_total->ddo_dspace += ddo->ddo_dspace;
 141                                 ddo_total->ddo_mspace += ddo->ddo_mspace;
 142                         }
 143                 }
 144         }
 145
 146         /* ... and compute the averages. */
 147         if (ddo_total->ddo_count != 0) {
 148                 ddo_total->ddo_dspace /= ddo_total->ddo_count;
 149                 ddo_total->ddo_mspace /= ddo_total->ddo_count;
 150         }
 151 }
 152
 153 void
 154 ddt_get_dedup_histogram(spa_t *spa, ddt_histogram_t *ddh)
 155 {
 156         for (enum zio_checksum c = 0; c < ZIO_CHECKSUM_FUNCTIONS; c++) {
 157                 ddt_t *ddt = spa->spa_ddt[c];
 158                 for (enum ddt_type type = 0; type < DDT_TYPES && ddt; type++) {
 159                         for (enum ddt_class class = 0; class < DDT_CLASSES;
 160                             class++) {
 161                                 ddt_histogram_add(ddh,
 162                                     &ddt->ddt_histogram_cache[type][class]);
 163                         }
 164                 }
 165         }
 166 }
 167
 168 void
 169 ddt_get_dedup_stats(spa_t *spa, ddt_stat_t *dds_total)
 170 {
 171         ddt_histogram_t *ddh_total;
 172
 173         ddh_total = kmem_zalloc(sizeof (ddt_histogram_t), KM_SLEEP);
 174         ddt_get_dedup_histogram(spa, ddh_total);
 175         ddt_histogram_stat(dds_total, ddh_total);
 176         kmem_free(ddh_total, sizeof (ddt_histogram_t));
 177 }
 178
 179 uint64_t
 180 ddt_get_dedup_dspace(spa_t *spa)
 181 {
 182         ddt_stat_t dds_total;
 183
 184         if (spa->spa_dedup_dspace != ~0ULL)
 185                 return (spa->spa_dedup_dspace);
 186
 187         memset(&dds_total, 0, sizeof (ddt_stat_t));
 188
 189         /* Calculate and cache the stats */
 190         ddt_get_dedup_stats(spa, &dds_total);
 191         spa->spa_dedup_dspace = dds_total.dds_ref_dsize - dds_total.dds_dsize;
 192         return (spa->spa_dedup_dspace);
 193 }
 194
 195 uint64_t
 196 ddt_get_pool_dedup_ratio(spa_t *spa)
 197 {
 198         ddt_stat_t dds_total = { 0 };
 199
 200         ddt_get_dedup_stats(spa, &dds_total);
 201         if (dds_total.dds_dsize == 0)
 202                 return (100);
 203
 204         return (dds_total.dds_ref_dsize * 100 / dds_total.dds_dsize);
 205 }