linux-kernel - [PATCH] PM / suspend: show workqueue state in suspend flow

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Date:	Thu, 30 Jun 2016 11:17:46 +0800
From:	Roger Lu <roger.lu@...iatek.com>
To:	"Rafael J . Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	Tejun Heo <tj@...nel.org>
CC:	<srv_heupstream@...iatek.com>,
	<linux-mediatek@...ts.infradead.org>,
	Sascha Hauer <kernel@...gutronix.de>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	<linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	Roger Lu <roger.lu@...iatek.com>
Subject: [PATCH] PM / suspend: show workqueue state in suspend flow

If freezable workqueue aborts suspend flow, show
workqueue state for debug purpose.

Signed-off-by: Roger Lu <roger.lu@...iatek.com>
---
 kernel/power/process.c | 3 +++
 kernel/workqueue.c     | 7 +++++--
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/kernel/power/process.c b/kernel/power/process.c
index df058be..6eef250 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -89,6 +89,9 @@ static int try_to_freeze_tasks(bool user_only)
 		       elapsed_msecs / 1000, elapsed_msecs % 1000,
 		       todo - wq_busy, wq_busy);
 
+		if (wq_busy)
+			show_workqueue_state();
+
 		if (!wakeup) {
 			read_lock(&tasklist_lock);
 			for_each_process_thread(g, p) {
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index e1c0e99..c945617 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -4369,8 +4369,8 @@ static void show_pwq(struct pool_workqueue *pwq)
 /**
  * show_workqueue_state - dump workqueue state
  *
- * Called from a sysrq handler and prints out all busy workqueues and
- * pools.
+ * Called from a sysrq handler or try_to_freeze_tasks() and prints out
+ * all busy workqueues and pools.
  */
 void show_workqueue_state(void)
 {
@@ -4396,6 +4396,9 @@ void show_workqueue_state(void)
 		if (idle)
 			continue;
 
+		if (wq->flags & WQ_FREEZABLE)
+			pr_info("freezable ");
+
 		pr_info("workqueue %s: flags=0x%x\n", wq->name, wq->flags);
 
 		for_each_pwq(pwq, wq) {
-- 
2.6.4