From: Eric Dumazet edumazet@google.com
Rehashing and destroying large hash table takes a lot of time, and happens in process context. It is safe to add cond_resched() in rhashtable_rehash_table() and rhashtable_free_and_destroy()
Signed-off-by: Eric Dumazet edumazet@google.com Acked-by: Herbert Xu herbert@gondor.apana.org.au Signed-off-by: David S. Miller davem@davemloft.net (cherry picked from commit ae6da1f503abb5a5081f9f6c4a6881de97830f3e) --- lib/rhashtable.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/lib/rhashtable.c b/lib/rhashtable.c index 101dac085c62..fdffd6232365 100644 --- a/lib/rhashtable.c +++ b/lib/rhashtable.c @@ -251,8 +251,10 @@ static int rhashtable_rehash_table(struct rhashtable *ht) if (!new_tbl) return 0;
- for (old_hash = 0; old_hash < old_tbl->size; old_hash++) + for (old_hash = 0; old_hash < old_tbl->size; old_hash++) { rhashtable_rehash_chain(ht, old_hash); + cond_resched(); + }
/* Publish the new table pointer. */ rcu_assign_pointer(ht->tbl, new_tbl); @@ -993,6 +995,7 @@ void rhashtable_free_and_destroy(struct rhashtable *ht, for (i = 0; i < tbl->size; i++) { struct rhash_head *pos, *next;
+ cond_resched(); for (pos = rht_dereference(tbl->buckets[i], ht), next = !rht_is_a_nulls(pos) ? rht_dereference(pos->next, ht) : NULL;