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rhashtable: Add multiple rehash support

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This patch adds the missing bits to allow multiple rehashes.  The
read-side as well as remove already handle this correctly.  So it's
only the rehasher and insertion that need modification to handle
this.

Note that this patch doesn't actually enable it so for now rehashing
is still only performed by the worker thread.

This patch also disables the explicit expand/shrink interface because
the table is meant to expand and shrink automatically, and continuing
to export these interfaces unnecessarily complicates the life of the
rehasher since the rehash process is now composed of two parts.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu
2015-03-24 00:50:26 +11:00
committed by David S. Miller
parent 18093d1c0d
commit b824478b21
3 changed files with 86 additions and 51 deletions
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24
lib/test_rhashtable.c
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@@ -155,30 +155,6 @@ static int __init test_rhashtable(struct rhashtable *ht)
test_rht_lookup(ht);
rcu_read_unlock();
for (i = 0; i < TEST_NEXPANDS; i++) {
pr_info(" Table expansion iteration %u...\n", i);
mutex_lock(&ht->mutex);
rhashtable_expand(ht);
mutex_unlock(&ht->mutex);
rcu_read_lock();
pr_info(" Verifying lookups...\n");
test_rht_lookup(ht);
rcu_read_unlock();
}
for (i = 0; i < TEST_NEXPANDS; i++) {
pr_info(" Table shrinkage iteration %u...\n", i);
mutex_lock(&ht->mutex);
rhashtable_shrink(ht);
mutex_unlock(&ht->mutex);
rcu_read_lock();
pr_info(" Verifying lookups...\n");
test_rht_lookup(ht);
rcu_read_unlock();
}
rcu_read_lock();
test_bucket_stats(ht, true);
rcu_read_unlock();