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rhashtable: Add rehash counter to bucket_table

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This patch adds a rehash counter to bucket_table to indicate
the last bucket that has been rehashed.  This serves two purposes:

1. Any bucket that has been rehashed can never gain a new object.
2. If the rehash counter reaches the size of the table, the table
will forever remain empty.

This patch also downsizes bucket_table->size to an unsigned int
since we do not support sizes greater than 32 bits yet.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2015-03-14 13:57:24 +11:00 committed by David S. Miller
parent 9d901bc051
commit 63d512d0cf
3 changed files with 5 additions and 2 deletions
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4
include/linux/rhashtable.h
View File

@ -49,6 +49,7 @@ struct rhash_head {
/**
* struct bucket_table - Table of hash buckets
* @size: Number of hash buckets
* @rehash: Current bucket being rehashed
* @hash_rnd: Random seed to fold into hash
* @shift: Current size (1 << shift)
* @locks_mask: Mask to apply before accessing locks[]
@ -58,7 +59,8 @@ struct rhash_head {
* @buckets: size * hash buckets
*/
struct bucket_table {
size_t size;
unsigned int size;
unsigned int rehash;
u32 hash_rnd;
u32 shift;
unsigned int locks_mask;

1
lib/rhashtable.c
View File

@ -260,6 +260,7 @@ static void rhashtable_rehash_chain(struct rhashtable *ht, unsigned old_hash)
spin_lock_bh(old_bucket_lock);
while (!rhashtable_rehash_one(ht, old_hash))
;
old_tbl->rehash++;
spin_unlock_bh(old_bucket_lock);
}

2
lib/test_rhashtable.c
View File

@ -80,7 +80,7 @@ static void test_bucket_stats(struct rhashtable *ht, bool quiet)
rcu_cnt = cnt = 0;
if (!quiet)
pr_info(" [%#4x/%zu]", i, tbl->size);
pr_info(" [%#4x/%u]", i, tbl->size);
rht_for_each_entry_rcu(obj, pos, tbl, i, node) {
cnt++;