Function cache_fetch_bucket

freebsd/vm/uma_core.c:883–909

* Attempt to fetch a bucket from a zone on behalf of the current cpu cache. */

 * Attempt to fetch a bucket from a zone on behalf of the current cpu cache.
 */
static uma_bucket_t
cache_fetch_bucket(uma_zone_t zone, uma_cache_t cache, int domain)
{
	uma_zone_domain_t zdom;
	uma_bucket_t bucket;

	/*
	 * Avoid the lock if possible.
	 */
	zdom = ZDOM_GET(zone, domain);
	if (zdom->uzd_nitems == 0)
		return (NULL);

	if ((cache_uz_flags(cache) & UMA_ZONE_SMR) != 0 &&
	    !smr_poll(zone->uz_smr, zdom->uzd_seq, false))
		return (NULL);

	/*
	 * Check the zone's cache of buckets.
	 */
	zdom = zone_domain_lock(zone, domain);
	if ((bucket = zone_fetch_bucket(zone, zdom, false)) != NULL)
		return (bucket);
	ZDOM_UNLOCK(zdom);

	return (NULL);
}

static void
zone_log_warning(uma_zone_t zone)