From: Chunguang Xu <brookxu@tencent.com>
Date: Tue, 13 Apr 2021 01:39:05 +0000 (+0800)
Subject: cgroup: use tsk->in_iowait instead of delayacct_is_task_waiting_on_io()
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=ffeee417d97f9171bce9f43c22c9f477e4c84f54;p=linux.git

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 a5751784ad740..391aa570369bb 100644
--- 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;
 		}