From 91cf5ab60ff82ecf4550a596867787c1e360dd3f Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Wed, 11 Sep 2013 14:24:06 -0700 Subject: [PATCH] epoll: add a reschedule point in ep_free() ep_free() might iterate on a huge set of epitems and hold cpu too long. Add two cond_resched() in order to yield cpu to other tasks. This is safe as we only hold mutexes in this function. Signed-off-by: Eric Dumazet Cc: Al Viro Cc: Theodore Ts'o Acked-by: Eric Wong Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/eventpoll.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/eventpoll.c b/fs/eventpoll.c index 293f86741ddb..473e09da7d02 100644 --- a/fs/eventpoll.c +++ b/fs/eventpoll.c @@ -740,6 +740,7 @@ static void ep_free(struct eventpoll *ep) epi = rb_entry(rbp, struct epitem, rbn); ep_unregister_pollwait(ep, epi); + cond_resched(); } /* @@ -754,6 +755,7 @@ static void ep_free(struct eventpoll *ep) while ((rbp = rb_first(&ep->rbr)) != NULL) { epi = rb_entry(rbp, struct epitem, rbn); ep_remove(ep, epi); + cond_resched(); } mutex_unlock(&ep->mtx); -- 2.30.2