From fb19348bd709e3f948825ed995bdc477a0414772 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Wed, 10 Oct 2018 12:29:55 -0700 Subject: [PATCH] rhashtable: add schedule points 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 Acked-by: Herbert Xu Signed-off-by: David S. Miller (cherry picked from commit ae6da1f503abb5a5081f9f6c4a6881de97830f3e) Signed-off-by: Greg Kroah-Hartman --- 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; -- 2.20.1