Commit b5e2c150 authored by Thomas Graf's avatar Thomas Graf Committed by David S. Miller

rhashtable: Disable automatic shrinking by default

Introduce a new bool automatic_shrinking to require the
user to explicitly opt-in to automatic shrinking of tables.
Signed-off-by: default avatarThomas Graf <tgraf@suug.ch>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ac833bdd
......@@ -2,7 +2,7 @@
* Resizable, Scalable, Concurrent Hash Table
*
* Copyright (c) 2015 Herbert Xu <herbert@gondor.apana.org.au>
* Copyright (c) 2014 Thomas Graf <tgraf@suug.ch>
* Copyright (c) 2014-2015 Thomas Graf <tgraf@suug.ch>
* Copyright (c) 2008-2014 Patrick McHardy <kaber@trash.net>
*
* Code partially derived from nft_hash
......@@ -104,6 +104,7 @@ struct rhashtable;
* @min_size: Minimum size while shrinking
* @nulls_base: Base value to generate nulls marker
* @insecure_elasticity: Set to true to disable chain length checks
* @automatic_shrinking: Enable automatic shrinking of tables
* @locks_mul: Number of bucket locks to allocate per cpu (default: 128)
* @hashfn: Hash function (default: jhash2 if !(key_len % 4), or jhash)
* @obj_hashfn: Function to hash object
......@@ -118,6 +119,7 @@ struct rhashtable_params {
unsigned int min_size;
u32 nulls_base;
bool insecure_elasticity;
bool automatic_shrinking;
size_t locks_mul;
rht_hashfn_t hashfn;
rht_obj_hashfn_t obj_hashfn;
......@@ -784,7 +786,8 @@ static inline int rhashtable_remove_fast(
goto out;
atomic_dec(&ht->nelems);
if (rht_shrink_below_30(ht, tbl))
if (unlikely(ht->p.automatic_shrinking &&
rht_shrink_below_30(ht, tbl)))
schedule_work(&ht->run_work);
out:
......
......@@ -367,7 +367,7 @@ static void rht_deferred_worker(struct work_struct *work)
if (rht_grow_above_75(ht, tbl))
rhashtable_expand(ht);
else if (rht_shrink_below_30(ht, tbl))
else if (ht->p.automatic_shrinking && rht_shrink_below_30(ht, tbl))
rhashtable_shrink(ht);
err = rhashtable_rehash_table(ht);
......
......@@ -172,6 +172,7 @@ static const struct rhashtable_params nft_hash_params = {
.head_offset = offsetof(struct nft_hash_elem, node),
.key_offset = offsetof(struct nft_hash_elem, key),
.hashfn = jhash,
.automatic_shrinking = true,
};
static int nft_hash_init(const struct nft_set *set,
......
......@@ -3142,6 +3142,7 @@ static const struct rhashtable_params netlink_rhashtable_params = {
.obj_hashfn = netlink_hash,
.obj_cmpfn = netlink_compare,
.max_size = 65536,
.automatic_shrinking = true,
};
static int __init netlink_proto_init(void)
......
......@@ -2297,6 +2297,7 @@ static const struct rhashtable_params tsk_rht_params = {
.key_len = sizeof(u32), /* portid */
.max_size = 1048576,
.min_size = 256,
.automatic_shrinking = true,
};
int tipc_sk_rht_init(struct net *net)
......
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