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uz_bucket_size_max is the maximum permitted bucket size. When filling a new bucket to satisfy uma_zalloc(), the bucket is populated with at most uz_bucket_size_max items. The maximum number of entries in the bucket may be larger. When freeing items, however, we will fill per-CPPU buckets up to their maximum number of entries, potentially exceeding uz_bucket_size_max. This makes it difficult to precisely limit the number of items that may be cached in a zone. For example, if one wants to limit buckets to 1 entry for a particular zone, that's not possible since the smallest bucket holds up to 2 entries. Try to solve the problem by using uz_bucket_size_max to limit the number of entries in a bucket. Note that the ub_entries field is initialized upon every bucket allocation. Most zones are not affected since they do not impose any specific limit on the maximum bucket size. While here, remove the UMA_ZONE_MINBUCKET flag. It was unused and we now have uma_zone_set_maxcache() to control the zone's cache size more precisely. Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D27167
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