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authorHerbert Xu <herbert@gondor.apana.org.au>2015-03-14 13:57:24 +1100
committerDavid S. Miller <davem@davemloft.net>2015-03-15 01:35:34 -0400
commit63d512d0cffcae40505d9448abd509972465e846 (patch)
tree61aa0d3763daf884a089e41f8f0f7b829b9357c4
parent9d901bc05153bbf33b5da2cd6266865e531f0545 (diff)
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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.h4
-rw-r--r--lib/rhashtable.c1
-rw-r--r--lib/test_rhashtable.c2
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++;