From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754104AbdLDNzf (ORCPT ); Mon, 4 Dec 2017 08:55:35 -0500 Received: from mail-pg0-f67.google.com ([74.125.83.67]:34135 "EHLO mail-pg0-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754039AbdLDNza (ORCPT ); Mon, 4 Dec 2017 08:55:30 -0500 X-Google-Smtp-Source: AGs4zMZ7n+0eHhfQvqRoO2cOAkMnF76HfASxC2v1dJ2purhPkgFXLuLH6e1/I8x87moW21mo3XRrig== From: Sergey Senozhatsky To: Steven Rostedt , Petr Mladek Cc: Jan Kara , Andrew Morton , Peter Zijlstra , Rafael Wysocki , Pavel Machek , Tetsuo Handa , Tejun Heo , linux-kernel@vger.kernel.org, Sergey Senozhatsky , Sergey Senozhatsky Subject: [PATCH 3/4] printk: add offloading takeover traces Date: Mon, 4 Dec 2017 22:53:13 +0900 Message-Id: <20171204135314.9122-4-sergey.senozhatsky@gmail.com> X-Mailer: git-send-email 2.15.1 In-Reply-To: <20171204135314.9122-1-sergey.senozhatsky@gmail.com> References: <20171204134825.7822-1-sergey.senozhatsky@gmail.com> <20171204135314.9122-1-sergey.senozhatsky@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org *** FOR TESTING *** Add more trace events for printing offloading (handoff). Signed-off-by: Sergey Senozhatsky --- 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