cgroup: use tsk->in_iowait instead of delayacct_is_task_waiting_on_io()

If delayacct is disabled, then delayacct_is_task_waiting_on_io()
always returns false, which causes the statistical value to be
wrong. Perhaps tsk->in_iowait is better.

Signed-off-by: Chunguang Xu <brookxu@tencent.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

diff --git a/kernel/cgroup/cgroup-v1.c b/kernel/cgroup/cgroup-v1.c
index a5751784ad7401a2758456b41d6699de7be5f96b..391aa570369bba0d4726d6822eab5da2c0b5dd11 100644 (file)
--- a/kernel/cgroup/cgroup-v1.c
+++ b/kernel/cgroup/cgroup-v1.c
@@ -727,7 +727,7 @@ int cgroupstats_build(struct cgroupstats *stats, struct dentry *dentry)
                        stats->nr_stopped++;
                        break;
                default:
-                       if (delayacct_is_task_waiting_on_io(tsk))
+                       if (tsk->in_iowait)
                                stats->nr_io_wait++;
                        break;
                }