From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030203AbcDLPoy (ORCPT ); Tue, 12 Apr 2016 11:44:54 -0400 Received: from e36.co.us.ibm.com ([32.97.110.154]:58668 "EHLO e36.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965626AbcDLPow (ORCPT ); Tue, 12 Apr 2016 11:44:52 -0400 X-IBM-Helo: d03dlp02.boulder.ibm.com X-IBM-MailFrom: paulmck@linux.vnet.ibm.com X-IBM-RcptTo: linux-kernel@vger.kernel.org From: "Paul E. McKenney" To: linux-kernel@vger.kernel.org Cc: mingo@kernel.org, jiangshanlai@gmail.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@efficios.com, josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com, dvhart@linux.intel.com, fweisbec@gmail.com, oleg@redhat.com, bobby.prani@gmail.com, "Paul E. McKenney" Subject: [PATCH tip/core/rcu 07/24] rcutorture: Set rcuperf writer kthreads to real-time priority Date: Tue, 12 Apr 2016 08:43:40 -0700 Message-Id: <1460475837-26498-7-git-send-email-paulmck@linux.vnet.ibm.com> X-Mailer: git-send-email 2.5.2 In-Reply-To: <20160412154332.GA24983@linux.vnet.ibm.com> References: <20160412154332.GA24983@linux.vnet.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 16041215-0021-0000-0000-000032EE7558 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This commit forces more deterministic update-side behavior by setting rcuperf's rcu_perf_writer() kthreads to real-time priority. Signed-off-by: Paul E. McKenney --- kernel/rcu/rcuperf.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/rcu/rcuperf.c b/kernel/rcu/rcuperf.c index 7a1edf417d18..e18d016a9888 100644 --- a/kernel/rcu/rcuperf.c +++ b/kernel/rcu/rcuperf.c @@ -355,6 +355,7 @@ rcu_perf_writer(void *arg) int i = 0; int i_max; long me = (long)arg; + struct sched_param sp; bool started = false, done = false, alldone = false; u64 t; u64 *wdp; @@ -365,6 +366,8 @@ rcu_perf_writer(void *arg) WARN_ON(rcu_gp_is_normal() && gp_exp); WARN_ON(!wdpp); set_cpus_allowed_ptr(current, cpumask_of(me % nr_cpu_ids)); + sp.sched_priority = 1; + sched_setscheduler_nocheck(current, SCHED_FIFO, &sp); t = ktime_get_mono_fast_ns(); if (atomic_inc_return(&n_rcu_perf_writer_started) >= nrealwriters) { t_rcu_perf_writer_started = t; -- 2.5.2