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 #include <sys/zfs_context.h> 23 #include <sys/dbuf.h> 24 #include <sys/dmu_objset.h> 25 26 /* 27 * Calculate the index of the arc header for the state, disabled by default. 28 */ 29 int zfs_dbuf_state_index = 0; 30 31 /* 32 * ========================================================================== 33 * Dbuf Hash Read Routines 34 * ========================================================================== 35 */ 36 typedef struct dbuf_stats_t { 37 kmutex_t lock; 38 kstat_t *kstat; 39 dbuf_hash_table_t *hash; 40 int idx; 41 } dbuf_stats_t; 42 43 static dbuf_stats_t dbuf_stats_hash_table; 44 45 static int 46 dbuf_stats_hash_table_headers(char *buf, size_t size) 47 { 48 (void) snprintf(buf, size, 49 "%-96s | %-119s | %s\n" 50 "%-16s %-8s %-8s %-8s %-8s %-10s %-8s %-5s %-5s %-7s %3s | " 51 "%-5s %-5s %-9s %-6s %-8s %-12s " 52 "%-6s %-6s %-6s %-6s %-6s %-8s %-8s %-8s %-6s | " 53 "%-6s %-6s %-8s %-8s %-6s %-6s %-6s %-8s %-8s\n", 54 "dbuf", "arcbuf", "dnode", "pool", "objset", "object", "level", 55 "blkid", "offset", "dbsize", "meta", "state", "dbholds", "dbc", 56 "list", "atype", "flags", "count", "asize", "access", 57 "mru", "gmru", "mfu", "gmfu", "l2", "l2_dattr", "l2_asize", 58 "l2_comp", "aholds", "dtype", "btype", "data_bs", "meta_bs", 59 "bsize", "lvls", "dholds", "blocks", "dsize"); 60 61 return (0); 62 } 63 64 static int 65 __dbuf_stats_hash_table_data(char *buf, size_t size, dmu_buf_impl_t *db) 66 { 67 arc_buf_info_t abi = { 0 }; 68 dmu_object_info_t doi = { 0 }; 69 dnode_t *dn = DB_DNODE(db); 70 size_t nwritten; 71 72 if (db->db_buf) 73 arc_buf_info(db->db_buf, &abi, zfs_dbuf_state_index); 74 75 __dmu_object_info_from_dnode(dn, &doi); 76 77 nwritten = snprintf(buf, size, 78 "%-16s %-8llu %-8lld %-8lld %-8lld %-10llu %-8llu %-5d %-5d " 79 "%-7lu %-3d | %-5d %-5d 0x%-7x %-6lu %-8llu %-12llu " 80 "%-6lu %-6lu %-6lu %-6lu %-6lu %-8llu %-8llu %-8d %-6lu | " 81 "%-6d %-6d %-8lu %-8lu %-6llu %-6lu %-6lu %-8llu %-8llu\n", 82 /* dmu_buf_impl_t */ 83 spa_name(dn->dn_objset->os_spa), 84 (u_longlong_t)dmu_objset_id(db->db_objset), 85 (longlong_t)db->db.db_object, 86 (longlong_t)db->db_level, 87 (longlong_t)db->db_blkid, 88 (u_longlong_t)db->db.db_offset, 89 (u_longlong_t)db->db.db_size, 90 !!dbuf_is_metadata(db), 91 db->db_state, 92 (ulong_t)zfs_refcount_count(&db->db_holds), 93 multilist_link_active(&db->db_cache_link), 94 /* arc_buf_info_t */ 95 abi.abi_state_type, 96 abi.abi_state_contents, 97 abi.abi_flags, 98 (ulong_t)abi.abi_bufcnt, 99 (u_longlong_t)abi.abi_size, 100 (u_longlong_t)abi.abi_access, 101 (ulong_t)abi.abi_mru_hits, 102 (ulong_t)abi.abi_mru_ghost_hits, 103 (ulong_t)abi.abi_mfu_hits, 104 (ulong_t)abi.abi_mfu_ghost_hits, 105 (ulong_t)abi.abi_l2arc_hits, 106 (u_longlong_t)abi.abi_l2arc_dattr, 107 (u_longlong_t)abi.abi_l2arc_asize, 108 abi.abi_l2arc_compress, 109 (ulong_t)abi.abi_holds, 110 /* dmu_object_info_t */ 111 doi.doi_type, 112 doi.doi_bonus_type, 113 (ulong_t)doi.doi_data_block_size, 114 (ulong_t)doi.doi_metadata_block_size, 115 (u_longlong_t)doi.doi_bonus_size, 116 (ulong_t)doi.doi_indirection, 117 (ulong_t)zfs_refcount_count(&dn->dn_holds), 118 (u_longlong_t)doi.doi_fill_count, 119 (u_longlong_t)doi.doi_max_offset); 120 121 if (nwritten >= size) 122 return (size); 123 124 return (nwritten + 1); 125 } 126 127 static int 128 dbuf_stats_hash_table_data(char *buf, size_t size, void *data) 129 { 130 dbuf_stats_t *dsh = (dbuf_stats_t *)data; 131 dbuf_hash_table_t *h = dsh->hash; 132 dmu_buf_impl_t *db; 133 int length, error = 0; 134 135 ASSERT3S(dsh->idx, >=, 0); 136 ASSERT3S(dsh->idx, <=, h->hash_table_mask); 137 if (size) 138 buf[0] = 0; 139 140 mutex_enter(DBUF_HASH_MUTEX(h, dsh->idx)); 141 for (db = h->hash_table[dsh->idx]; db != NULL; db = db->db_hash_next) { 142 /* 143 * Returning ENOMEM will cause the data and header functions 144 * to be called with a larger scratch buffers. 145 */ 146 if (size < 512) { 147 error = SET_ERROR(ENOMEM); 148 break; 149 } 150 151 mutex_enter(&db->db_mtx); 152 153 if (db->db_state != DB_EVICTING) { 154 length = __dbuf_stats_hash_table_data(buf, size, db); 155 buf += length; 156 size -= length; 157 } 158 159 mutex_exit(&db->db_mtx); 160 } 161 mutex_exit(DBUF_HASH_MUTEX(h, dsh->idx)); 162 163 return (error); 164 } 165 166 static void * 167 dbuf_stats_hash_table_addr(kstat_t *ksp, loff_t n) 168 { 169 dbuf_stats_t *dsh = ksp->ks_private; 170 171 ASSERT(MUTEX_HELD(&dsh->lock)); 172 173 if (n <= dsh->hash->hash_table_mask) { 174 dsh->idx = n; 175 return (dsh); 176 } 177 178 return (NULL); 179 } 180 181 static void 182 dbuf_stats_hash_table_init(dbuf_hash_table_t *hash) 183 { 184 dbuf_stats_t *dsh = &dbuf_stats_hash_table; 185 kstat_t *ksp; 186 187 mutex_init(&dsh->lock, NULL, MUTEX_DEFAULT, NULL); 188 dsh->hash = hash; 189 190 ksp = kstat_create("zfs", 0, "dbufs", "misc", 191 KSTAT_TYPE_RAW, 0, KSTAT_FLAG_VIRTUAL); 192 dsh->kstat = ksp; 193 194 if (ksp) { 195 ksp->ks_lock = &dsh->lock; 196 ksp->ks_ndata = UINT32_MAX; 197 ksp->ks_private = dsh; 198 kstat_set_raw_ops(ksp, dbuf_stats_hash_table_headers, 199 dbuf_stats_hash_table_data, dbuf_stats_hash_table_addr); 200 kstat_install(ksp); 201 } 202 } 203 204 static void 205 dbuf_stats_hash_table_destroy(void) 206 { 207 dbuf_stats_t *dsh = &dbuf_stats_hash_table; 208 kstat_t *ksp; 209 210 ksp = dsh->kstat; 211 if (ksp) 212 kstat_delete(ksp); 213 214 mutex_destroy(&dsh->lock); 215 } 216 217 void 218 dbuf_stats_init(dbuf_hash_table_t *hash) 219 { 220 dbuf_stats_hash_table_init(hash); 221 } 222 223 void 224 dbuf_stats_destroy(void) 225 { 226 dbuf_stats_hash_table_destroy(); 227 } 228 229 ZFS_MODULE_PARAM(zfs, zfs_, dbuf_state_index, INT, ZMOD_RW, 230 "Calculate arc header index"); 231