From: Ye Liu <ye.liu@linux.dev>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Ye Liu <liuye@kylinos.cn>, Lance Yang <lance.yang@linux.dev>,
linux-kernel@vger.kernel.org
Subject: [PATCH] hung_task: add warning counter to blocked task report
Date: Mon, 21 Jul 2025 11:17:54 +0800 [thread overview]
Message-ID: <20250721031755.1418556-1-ye.liu@linux.dev> (raw)
From: Ye Liu <liuye@kylinos.cn>
Add a warning counter to each hung task message to make it easier
to analyze and locate issues in the logs.
Signed-off-by: Ye Liu <liuye@kylinos.cn>
---
kernel/hung_task.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/kernel/hung_task.c b/kernel/hung_task.c
index 8708a1205f82..9e5f86148d47 100644
--- a/kernel/hung_task.c
+++ b/kernel/hung_task.c
@@ -58,6 +58,7 @@ EXPORT_SYMBOL_GPL(sysctl_hung_task_timeout_secs);
static unsigned long __read_mostly sysctl_hung_task_check_interval_secs;
static int __read_mostly sysctl_hung_task_warnings = 10;
+static int hung_task_warning_count;
static int __read_mostly did_panic;
static bool hung_task_show_lock;
@@ -232,8 +233,9 @@ static void check_hung_task(struct task_struct *t, unsigned long timeout)
if (sysctl_hung_task_warnings || hung_task_call_panic) {
if (sysctl_hung_task_warnings > 0)
sysctl_hung_task_warnings--;
- pr_err("INFO: task %s:%d blocked for more than %ld seconds.\n",
- t->comm, t->pid, (jiffies - t->last_switch_time) / HZ);
+ pr_err("INFO: task %s:%d blocked for more than %ld seconds. [Warning #%d]\n",
+ t->comm, t->pid, (jiffies - t->last_switch_time) / HZ,
+ ++hung_task_warning_count);
pr_err(" %s %s %.*s\n",
print_tainted(), init_utsname()->release,
(int)strcspn(init_utsname()->version, " "),
--
2.43.0
next reply other threads:[~2025-07-21 3:18 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-21 3:17 Ye Liu [this message]
2025-07-21 4:56 ` [PATCH] hung_task: add warning counter to blocked task report Lance Yang
2025-07-21 5:45 ` Ye Liu
2025-07-21 6:19 ` Lance Yang
2025-07-23 7:31 ` Ye Liu
2025-07-23 10:46 ` Lance Yang
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