linux-kernel - [PATCH v2] kernel/sched/core: Print the time when the process entered the D state

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Date:   Fri,  9 Jul 2021 04:54:49 -0700
From:   zhouchuangao <zhouchuangao@...o.com>
To:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        linux-kernel@...r.kernel.org
Cc:     zhouchuangao <zhouchuangao@...o.com>
Subject: [PATCH v2] kernel/sched/core: Print the time when the process entered the D state

Sometimes we need to trigger /proc/sysrq-trigger to view the information
of the D state process in the system.
e.g:
echo w > /proc/sysrq-trigger

Here we print the scheduling time of the process, which is convenient
for us to judge the state of the system and for debugging.

Signed-off-by: zhouchuangao <zhouchuangao@...o.com>
---
 kernel/sched/core.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index cf16f8f..ab422ab 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -8154,10 +8154,12 @@ void sched_show_task(struct task_struct *p)
 	if (pid_alive(p))
 		ppid = task_pid_nr(rcu_dereference(p->real_parent));
 	rcu_read_unlock();
-	pr_cont(" stack:%5lu pid:%5d ppid:%6d flags:0x%08lx\n",
+	pr_cont(" stack:%5lu pid:%5d ppid:%6d flags:0x%08lx",
 		free, task_pid_nr(p), ppid,
 		(unsigned long)task_thread_info(p)->flags);
-
+#ifdef CONFIG_SCHED_INFO
+	pr_cont(" sched:%llu\n", p->sched_info.last_arrival);
+#endif
 	print_worker_info(KERN_INFO, p);
 	print_stop_info(KERN_INFO, p);
 	show_stack(p, NULL, KERN_INFO);
-- 
2.7.4