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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or https://opensource.org/licenses/CDDL-1.0.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
#include <sys/zfs_context.h>
#include <sys/dbuf.h>
#include <sys/dmu_objset.h>
/*
* Calculate the index of the arc header for the state, disabled by default.
*/
int zfs_dbuf_state_index = 0;
/*
* ==========================================================================
* Dbuf Hash Read Routines
* ==========================================================================
*/
typedef struct dbuf_stats_t {
kmutex_t lock;
kstat_t *kstat;
dbuf_hash_table_t *hash;
int idx;
} dbuf_stats_t;
static dbuf_stats_t dbuf_stats_hash_table;
static int
dbuf_stats_hash_table_headers(char *buf, size_t size)
{
(void) snprintf(buf, size,
"%-105s | %-119s | %s\n"
"%-16s %-8s %-8s %-8s %-8s %-10s %-8s %-8s %-5s %-5s %-7s %3s | "
"%-5s %-5s %-9s %-6s %-8s %-12s "
"%-6s %-6s %-6s %-6s %-6s %-8s %-8s %-8s %-6s | "
"%-6s %-6s %-8s %-8s %-6s %-6s %-6s %-8s %-8s\n",
"dbuf", "arcbuf", "dnode", "pool", "objset", "object", "level",
"blkid", "offset", "dbsize", "usize", "meta", "state", "dbholds",
"dbc", "list", "atype", "flags", "count", "asize", "access",
"mru", "gmru", "mfu", "gmfu", "l2", "l2_dattr", "l2_asize",
"l2_comp", "aholds", "dtype", "btype", "data_bs", "meta_bs",
"bsize", "lvls", "dholds", "blocks", "dsize");
return (0);
}
static int
__dbuf_stats_hash_table_data(char *buf, size_t size, dmu_buf_impl_t *db)
{
arc_buf_info_t abi = { 0 };
dmu_object_info_t doi = { 0 };
dnode_t *dn = DB_DNODE(db);
size_t nwritten;
if (db->db_buf)
arc_buf_info(db->db_buf, &abi, zfs_dbuf_state_index);
__dmu_object_info_from_dnode(dn, &doi);
nwritten = snprintf(buf, size,
"%-16s %-8llu %-8lld %-8lld %-8lld %-10llu %-8llu %-8llu "
"%-5d %-5d %-7lu %-3d | %-5d %-5d 0x%-7x %-6lu %-8llu %-12llu "
"%-6lu %-6lu %-6lu %-6lu %-6lu %-8llu %-8llu %-8d %-6lu | "
"%-6d %-6d %-8lu %-8lu %-6llu %-6lu %-6lu %-8llu %-8llu\n",
/* dmu_buf_impl_t */
spa_name(dn->dn_objset->os_spa),
(u_longlong_t)dmu_objset_id(db->db_objset),
(longlong_t)db->db.db_object,
(longlong_t)db->db_level,
(longlong_t)db->db_blkid,
(u_longlong_t)db->db.db_offset,
(u_longlong_t)db->db.db_size,
(u_longlong_t)dmu_buf_user_size(&db->db),
!!dbuf_is_metadata(db),
db->db_state,
(ulong_t)zfs_refcount_count(&db->db_holds),
multilist_link_active(&db->db_cache_link),
/* arc_buf_info_t */
abi.abi_state_type,
abi.abi_state_contents,
abi.abi_flags,
(ulong_t)abi.abi_bufcnt,
(u_longlong_t)abi.abi_size,
(u_longlong_t)abi.abi_access,
(ulong_t)abi.abi_mru_hits,
(ulong_t)abi.abi_mru_ghost_hits,
(ulong_t)abi.abi_mfu_hits,
(ulong_t)abi.abi_mfu_ghost_hits,
(ulong_t)abi.abi_l2arc_hits,
(u_longlong_t)abi.abi_l2arc_dattr,
(u_longlong_t)abi.abi_l2arc_asize,
abi.abi_l2arc_compress,
(ulong_t)abi.abi_holds,
/* dmu_object_info_t */
doi.doi_type,
doi.doi_bonus_type,
(ulong_t)doi.doi_data_block_size,
(ulong_t)doi.doi_metadata_block_size,
(u_longlong_t)doi.doi_bonus_size,
(ulong_t)doi.doi_indirection,
(ulong_t)zfs_refcount_count(&dn->dn_holds),
(u_longlong_t)doi.doi_fill_count,
(u_longlong_t)doi.doi_max_offset);
if (nwritten >= size)
return (size);
return (nwritten + 1);
}
static int
dbuf_stats_hash_table_data(char *buf, size_t size, void *data)
{
dbuf_stats_t *dsh = (dbuf_stats_t *)data;
dbuf_hash_table_t *h = dsh->hash;
dmu_buf_impl_t *db;
int length, error = 0;
ASSERT3S(dsh->idx, >=, 0);
ASSERT3S(dsh->idx, <=, h->hash_table_mask);
if (size)
buf[0] = 0;
mutex_enter(DBUF_HASH_MUTEX(h, dsh->idx));
for (db = h->hash_table[dsh->idx]; db != NULL; db = db->db_hash_next) {
/*
* Returning ENOMEM will cause the data and header functions
* to be called with a larger scratch buffers.
*/
if (size < 512) {
error = SET_ERROR(ENOMEM);
break;
}
mutex_enter(&db->db_mtx);
if (db->db_state != DB_EVICTING) {
length = __dbuf_stats_hash_table_data(buf, size, db);
buf += length;
size -= length;
}
mutex_exit(&db->db_mtx);
}
mutex_exit(DBUF_HASH_MUTEX(h, dsh->idx));
return (error);
}
static void *
dbuf_stats_hash_table_addr(kstat_t *ksp, loff_t n)
{
dbuf_stats_t *dsh = ksp->ks_private;
ASSERT(MUTEX_HELD(&dsh->lock));
if (n <= dsh->hash->hash_table_mask) {
dsh->idx = n;
return (dsh);
}
return (NULL);
}
static void
dbuf_stats_hash_table_init(dbuf_hash_table_t *hash)
{
dbuf_stats_t *dsh = &dbuf_stats_hash_table;
kstat_t *ksp;
mutex_init(&dsh->lock, NULL, MUTEX_DEFAULT, NULL);
dsh->hash = hash;
ksp = kstat_create("zfs", 0, "dbufs", "misc",
KSTAT_TYPE_RAW, 0, KSTAT_FLAG_VIRTUAL);
dsh->kstat = ksp;
if (ksp) {
ksp->ks_lock = &dsh->lock;
ksp->ks_ndata = UINT32_MAX;
ksp->ks_private = dsh;
kstat_set_raw_ops(ksp, dbuf_stats_hash_table_headers,
dbuf_stats_hash_table_data, dbuf_stats_hash_table_addr);
kstat_install(ksp);
}
}
static void
dbuf_stats_hash_table_destroy(void)
{
dbuf_stats_t *dsh = &dbuf_stats_hash_table;
kstat_t *ksp;
ksp = dsh->kstat;
if (ksp)
kstat_delete(ksp);
mutex_destroy(&dsh->lock);
}
void
dbuf_stats_init(dbuf_hash_table_t *hash)
{
dbuf_stats_hash_table_init(hash);
}
void
dbuf_stats_destroy(void)
{
dbuf_stats_hash_table_destroy();
}
ZFS_MODULE_PARAM(zfs, zfs_, dbuf_state_index, INT, ZMOD_RW,
"Calculate arc header index");
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