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| author | Herbert Xu <herbert@gondor.apana.org.au> | 2015-03-14 13:57:24 +1100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-03-15 01:35:34 -0400 |
| commit | 63d512d0cffcae40505d9448abd509972465e846 (patch) | |
| tree | 61aa0d3763daf884a089e41f8f0f7b829b9357c4 | |
| parent | 9d901bc05153bbf33b5da2cd6266865e531f0545 (diff) | |
| download | linux-63d512d0cffcae40505d9448abd509972465e846.tar.gz linux-63d512d0cffcae40505d9448abd509972465e846.tar.bz2 linux-63d512d0cffcae40505d9448abd509972465e846.zip | |
rhashtable: Add rehash counter to bucket_table
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>
| -rw-r--r-- | include/linux/rhashtable.h | 4 | ||||
| -rw-r--r-- | lib/rhashtable.c | 1 | ||||
| -rw-r--r-- | lib/test_rhashtable.c | 2 |
3 files changed, 5 insertions, 2 deletions
diff --git a/include/linux/rhashtable.h b/include/linux/rhashtable.h index a0abddd226b3..ed7562ad4ca0 100644 --- a/include/linux/rhashtable.h +++ b/include/linux/rhashtable.h @@ -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; diff --git a/lib/rhashtable.c b/lib/rhashtable.c index 36fb0910bec2..ff4ea1704546 100644 --- a/lib/rhashtable.c +++ b/lib/rhashtable.c @@ -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); } diff --git a/lib/test_rhashtable.c b/lib/test_rhashtable.c index 67c7593d1dd6..16974fd89e4e 100644 --- a/lib/test_rhashtable.c +++ b/lib/test_rhashtable.c @@ -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++; |