Commit 94000176 authored by Ying Xue's avatar Ying Xue Committed by David S. Miller

lib/rhashtable: allow user to set the minimum shifts of shrinking

Although rhashtable library allows user to specify a quiet big size
for user's created hash table, the table may be shrunk to a
very small size - HASH_MIN_SIZE(4) after object is removed from
the table at the first time. Subsequently, even if the total amount
of objects saved in the table is quite lower than user's initial
setting in a long time, the hash table size is still dynamically
adjusted by rhashtable_shrink() or rhashtable_expand() each time
object is inserted or removed from the table. However, as
synchronize_rcu() has to be called when table is shrunk or
expanded by the two functions, we should permit user to set the
minimum table size through configuring the minimum number of shifts
according to user specific requirement, avoiding these expensive
actions of shrinking or expanding because of calling synchronize_rcu().
Signed-off-by: default avatarYing Xue <>
Acked-by: default avatarThomas Graf <>
Signed-off-by: default avatarDavid S. Miller <>
parent 1f59533f
......@@ -44,6 +44,7 @@ struct rhashtable;
* @head_offset: Offset of rhash_head in struct to be hashed
* @hash_rnd: Seed to use while hashing
* @max_shift: Maximum number of shifts while expanding
* @min_shift: Minimum number of shifts while shrinking
* @hashfn: Function to hash key
* @obj_hashfn: Function to hash object
* @grow_decision: If defined, may return true if table should expand
......@@ -57,6 +58,7 @@ struct rhashtable_params {
size_t head_offset;
u32 hash_rnd;
size_t max_shift;
size_t min_shift;
rht_hashfn_t hashfn;
rht_obj_hashfn_t obj_hashfn;
bool (*grow_decision)(const struct rhashtable *ht,
......@@ -298,7 +298,7 @@ int rhashtable_shrink(struct rhashtable *ht, gfp_t flags)
if (tbl->size <= HASH_MIN_SIZE)
if (ht->shift <= ht->p.min_shift)
return 0;
ntbl = bucket_table_alloc(tbl->size / 2, flags);
......@@ -506,9 +506,10 @@ void *rhashtable_lookup_compare(const struct rhashtable *ht, u32 hash,
static size_t rounded_hashtable_size(unsigned int nelem)
static size_t rounded_hashtable_size(struct rhashtable_params *params)
return max(roundup_pow_of_two(nelem * 4 / 3), HASH_MIN_SIZE);
return max(roundup_pow_of_two(params->nelem_hint * 4 / 3),
1UL << params->min_shift);
......@@ -566,8 +567,11 @@ int rhashtable_init(struct rhashtable *ht, struct rhashtable_params *params)
(!params->key_len && !params->obj_hashfn))
return -EINVAL;
params->min_shift = max_t(size_t, params->min_shift,
if (params->nelem_hint)
size = rounded_hashtable_size(params->nelem_hint);
size = rounded_hashtable_size(params);
tbl = bucket_table_alloc(size, GFP_KERNEL);
if (tbl == NULL)
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