Function dbuf_init

freebsd/contrib/openzfs/module/zfs/dbuf.c:786–867

}

void
dbuf_init(void)
{
	uint64_t hsize = 1ULL << 16;
	dbuf_hash_table_t *h = &dbuf_hash_table;
	int i;

	/*
	 * The hash table is big enough to fill all of physical memory
	 * with an average block size of zfs_arc_average_blocksize (default 8K).
	 * By default, the table will take up
	 * totalmem * sizeof(void*) / 8K (1MB per GB with 8-byte pointers).
	 */
	while (hsize * zfs_arc_average_blocksize < physmem * PAGESIZE)
		hsize <<= 1;

retry:
	h->hash_table_mask = hsize - 1;
#if defined(_KERNEL)
	/*
	 * Large allocations which do not require contiguous pages
	 * should be using vmem_alloc() in the linux kernel
	 */
	h->hash_table = vmem_zalloc(hsize * sizeof (void *), KM_SLEEP);
#else
	h->hash_table = kmem_zalloc(hsize * sizeof (void *), KM_NOSLEEP);
#endif
	if (h->hash_table == NULL) {
		/* XXX - we should really return an error instead of assert */
		ASSERT(hsize > (1ULL << 10));
		hsize >>= 1;
		goto retry;
	}

	dbuf_kmem_cache = kmem_cache_create("dmu_buf_impl_t",
	    sizeof (dmu_buf_impl_t),
	    0, dbuf_cons, dbuf_dest, NULL, NULL, NULL, 0);

	for (i = 0; i < DBUF_MUTEXES; i++)
		mutex_init(&h->hash_mutexes[i], NULL, MUTEX_DEFAULT, NULL);

	dbuf_stats_init(h);

	/*
	 * All entries are queued via taskq_dispatch_ent(), so min/maxalloc
	 * configuration is not required.
	 */
	dbu_evict_taskq = taskq_create("dbu_evict", 1, defclsyspri, 0, 0, 0);

	for (dbuf_cached_state_t dcs = 0; dcs < DB_CACHE_MAX; dcs++) {
		dbuf_caches[dcs].cache =
		    multilist_create(sizeof (dmu_buf_impl_t),
		    offsetof(dmu_buf_impl_t, db_cache_link),
		    dbuf_cache_multilist_index_func);
		zfs_refcount_create(&dbuf_caches[dcs].size);
	}

	dbuf_evict_thread_exit = B_FALSE;