From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757426AbaD2ACf (ORCPT ); Mon, 28 Apr 2014 20:02:35 -0400 Received: from e37.co.us.ibm.com ([32.97.110.158]:55895 "EHLO e37.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753173AbaD1X4m (ORCPT ); Mon, 28 Apr 2014 19:56:42 -0400 From: "Paul E. McKenney" To: linux-kernel@vger.kernel.org Cc: mingo@kernel.org, laijs@cn.fujitsu.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@efficios.com, josh@joshtriplett.org, niv@us.ibm.com, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com, darren@dvhart.com, fweisbec@gmail.com, oleg@redhat.com, sbw@mit.edu, Andreea-Cristina Bernat , "Paul E. McKenney" Subject: [PATCH tip/core/rcu 10/19] rcu: Add event tracing to dyntick_save_progress_counter(). Date: Mon, 28 Apr 2014 16:56:23 -0700 Message-Id: <1398729392-15087-10-git-send-email-paulmck@linux.vnet.ibm.com> X-Mailer: git-send-email 1.8.1.5 In-Reply-To: <1398729392-15087-1-git-send-email-paulmck@linux.vnet.ibm.com> References: <20140428235600.GA12200@linux.vnet.ibm.com> <1398729392-15087-1-git-send-email-paulmck@linux.vnet.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 14042823-7164-0000-0000-0000015FB4FF Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Andreea-Cristina Bernat This patch adds event tracing to dyntick_save_progress_counter() in the case where it returns 1. I used the tracepoint string "dti" because this function returns 1 in case the CPU is in dynticks idle mode. Signed-off-by: Andreea-Cristina Bernat Signed-off-by: Paul E. McKenney --- kernel/rcu/tree.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index fca911b6b29c..c6fd0f15425c 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -772,7 +772,12 @@ static int dyntick_save_progress_counter(struct rcu_data *rdp, { rdp->dynticks_snap = atomic_add_return(0, &rdp->dynticks->dynticks); rcu_sysidle_check_cpu(rdp, isidle, maxj); - return (rdp->dynticks_snap & 0x1) == 0; + if ((rdp->dynticks_snap & 0x1) == 0) { + trace_rcu_fqs(rdp->rsp->name, rdp->gpnum, rdp->cpu, TPS("dti")); + return 1; + } else { + return 0; + } } /* -- 1.8.1.5