linux-kernel - [PATCH 3/4] printk: add offloading takeover traces

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Date:   Mon,  4 Dec 2017 22:53:13 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Petr Mladek <pmladek@...e.com>
Cc:     Jan Kara <jack@...e.cz>, Andrew Morton <akpm@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Rafael Wysocki <rjw@...ysocki.net>,
        Pavel Machek <pavel@....cz>,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Subject: [PATCH 3/4] printk: add offloading takeover traces

*** FOR TESTING ***

Add more trace events for printing offloading (handoff).

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
---
 kernel/printk/printk.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 01626f2f42bd..a34a839e6045 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -620,6 +620,8 @@ static unsigned long spinning_waiter_handoff_disable(void)
 
 static void console_handoff_printing(void)
 {
+	trace_offloading_rcuidle("handoff", " ", 0);
+
 	WRITE_ONCE(console_handoff_waiter, DONT_HANDOFF);
 	/* The waiter is now free to continue */
 	spin_release(&console_owner_dep_map, 1, _THIS_IP_);
@@ -3172,6 +3174,9 @@ static int printk_kthread_func(void *data)
 			WRITE_ONCE(console_handoff_waiter,
 					SLEEPING_WAITER_HANDOFF);
 		}
+
+		trace_offloading_rcuidle("set", "console_handoff_waiter",
+				READ_ONCE(console_handoff_waiter));
 		raw_spin_unlock(&console_owner_lock);
 
 		if (spin) {
-- 
2.15.1