linux-kernel - [PATCH 3/3] cgroup: use tsk->in_iowait instead of delayacct_is_task_waiting_on

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Date:   Wed, 31 Mar 2021 11:24:41 +0800
From:   brookxu <brookxu.cn@...il.com>
To:     adobriyan@...il.com, bsingharora@...il.com, tj@...nel.org,
        lizefan.x@...edance.com, hannes@...xchg.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] cgroup: use tsk->in_iowait instead of delayacct_is_task_waiting_on_io()

From: Chunguang Xu <brookxu@...cent.com>

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@...cent.com>
---
 kernel/cgroup/cgroup-v1.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/cgroup/cgroup-v1.c b/kernel/cgroup/cgroup-v1.c
index 32596fd..91991e2 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;
 		}
-- 
1.8.3.1