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 <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Theodore Ts'o <[email protected]>
Acked-by: Eric Wong <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 293f867..473e09d 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -740,6 +740,7 @@
epi = rb_entry(rbp, struct epitem, rbn);
ep_unregister_pollwait(ep, epi);
+ cond_resched();
}
/*
@@ -754,6 +755,7 @@
while ((rbp = rb_first(&ep->rbr)) != NULL) {
epi = rb_entry(rbp, struct epitem, rbn);
ep_remove(ep, epi);
+ cond_resched();
}
mutex_unlock(&ep->mtx);
