linux-kernel - [tip:timers/urgent] nohz: Print more debug info in tick_nohz_stop_sched

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Date:   Mon, 24 Apr 2017 10:01:04 -0700
From:   tip-bot for Frederic Weisbecker <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     hpa@...or.com, fweisbec@...il.com, torvalds@...ux-foundation.org,
        pavel@....cz, peterz@...radead.org, riel@...hat.com,
        hartsjc@...hat.com, tim@...bash.co.uk, mingo@...nel.org,
        tglx@...utronix.de, linux-kernel@...r.kernel.org
Subject: [tip:timers/urgent] nohz: Print more debug info in
 tick_nohz_stop_sched_tick()

Commit-ID:  098991fccfc7c0dd5fdfc6ed2ed965ad80f14be5
Gitweb:     http://git.kernel.org/tip/098991fccfc7c0dd5fdfc6ed2ed965ad80f14be5
Author:     Frederic Weisbecker <fweisbec@...il.com>
AuthorDate: Mon, 24 Apr 2017 16:04:37 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 24 Apr 2017 16:27:09 +0200

nohz: Print more debug info in tick_nohz_stop_sched_tick()

Print more debug info when triggering this warning:

  > ------------[ cut here ]------------
  > WARNING: CPU: 0 PID: 0 at kernel/time/tick-sched.c:874 __tick_nohz_idle_enter+0x461/0x490

Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: James Hartsock <hartsjc@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Pavel Machek <pavel@....cz>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Rik van Riel <riel@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Tim Wright <tim@...bash.co.uk>
Link: http://lkml.kernel.org/r/20170424140436.GD21353@lerouge
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/time/tick-sched.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index be7ca4d..b2df684 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -789,6 +789,7 @@ static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts,
 			goto out;
 
 		WARN_ON_ONCE(1);
+		printk_once("basemono: %llu ts->next_tick: %llu dev->next_event: %llu\n", basemono, ts->next_tick, dev->next_event);
 	}
 
 	/*