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authorHerbert Xu <herbert@gondor.apana.org.au>2015-03-14 13:57:23 +1100
committerDavid S. Miller <davem@davemloft.net>2015-03-15 01:35:34 -0400
commit9d901bc05153bbf33b5da2cd6266865e531f0545 (patch)
tree57518695b14d3f67e66c6e25ab2878f04158bf25 /lib
parent5269b53da4d432b0fbf755bd423c807bf6bd4aa0 (diff)
downloadop-kernel-dev-9d901bc05153bbf33b5da2cd6266865e531f0545.zip
op-kernel-dev-9d901bc05153bbf33b5da2cd6266865e531f0545.tar.gz
rhashtable: Free bucket tables asynchronously after rehash
There is in fact no need to wait for an RCU grace period in the rehash function, since all insertions are guaranteed to go into the new table through spin locks. This patch uses call_rcu to free the old/rehashed table at our leisure. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'lib')
-rw-r--r--lib/rhashtable.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/lib/rhashtable.c b/lib/rhashtable.c
index e55bbc8..36fb091 100644
--- a/lib/rhashtable.c
+++ b/lib/rhashtable.c
@@ -141,6 +141,11 @@ static void bucket_table_free(const struct bucket_table *tbl)
kvfree(tbl);
}
+static void bucket_table_free_rcu(struct rcu_head *head)
+{
+ bucket_table_free(container_of(head, struct bucket_table, rcu));
+}
+
static struct bucket_table *bucket_table_alloc(struct rhashtable *ht,
size_t nbuckets)
{
@@ -288,9 +293,7 @@ static void rhashtable_rehash(struct rhashtable *ht,
* table, and thus no references to the old table will
* remain.
*/
- synchronize_rcu();
-
- bucket_table_free(old_tbl);
+ call_rcu(&old_tbl->rcu, bucket_table_free_rcu);
}
/**
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