linux-kernel - [PATCH] hung_task: Print message when hung_task

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Message-ID: <20230201135416.GA6560@didi-ThinkCentre-M920t-N000>
Date:   Wed, 1 Feb 2023 21:54:33 +0800
From:   fuyuanli <fuyuanli@...iglobal.com>
To:     <pmladek@...e.com>, <akpm@...ux-foundation.org>,
        <linux@...musvillemoes.dk>
CC:     <linux-kernel@...r.kernel.org>
Subject: [PATCH] hung_task: Print message when hung_task_warnings gets down
 to zero.

It's useful to report it when hung_task_warnings gets down to zero,
so that we can know if kernel log was lost or there is no hung task
was detected.

Signed-off-by: fuyuanli <fuyuanli@...iglobal.com>
---
 kernel/hung_task.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/hung_task.c b/kernel/hung_task.c
index bb2354f73ded..ff479c51143d 100644
--- a/kernel/hung_task.c
+++ b/kernel/hung_task.c
@@ -142,6 +142,8 @@ static void check_hung_task(struct task_struct *t, unsigned long timeout)
 
 		if (sysctl_hung_task_all_cpu_backtrace)
 			hung_task_show_all_bt = true;
+		if (!sysctl_hung_task_warnings)
+			pr_info("Future hung task reports are suppressed, see sysctl kernel.hung_task_warnings\n");
 	}
 
 	touch_nmi_watchdog();
-- 
2.17.1