Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756477AbYFVUGx (ORCPT ); Sun, 22 Jun 2008 16:06:53 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754331AbYFVUGo (ORCPT ); Sun, 22 Jun 2008 16:06:44 -0400 Received: from E23SMTP06.au.ibm.com ([202.81.18.175]:51328 "EHLO e23smtp06.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754302AbYFVUGn (ORCPT ); Sun, 22 Jun 2008 16:06:43 -0400 Date: Sun, 22 Jun 2008 13:06:38 -0700 From: "Paul E. McKenney" To: linux-kernel@vger.kernel.org Cc: mingo@elte.hu, josh@freedesktop.org, dvhltc@us.ibm.com, niv@us.ibm.com, dino@in.ibm.com, akpm@linux-foundation.org, torvalds@linux-foundation.org, vegard.nossum@gmail.com, adobriyan@gmail.com, oleg@tv-sign.ru, bunk@kernel.org, rjw@sisk.pl Subject: [PATCH -tip-rcu] Make rcutorture more vicious: make quiescent rcutorture less power-hungry Message-ID: <20080622200638.GA25328@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <20080618122144.GA27143@linux.vnet.ibm.com> <20080618162649.GA18326@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080618162649.GA18326@linux.vnet.ibm.com> User-Agent: Mutt/1.5.13 (2006-08-11) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1331 Lines: 33 This patch makes the non-module rcutorture a bit more friendly to the power-conservation code. This is a rather simple-minded approach. More sophisticated approaches would get rid of the rcutorture tasks while rcutorture execution was suppressed, but attempts thus far to do this have not gone well -- calling rcu_torture_init() from a /proc callout results in oopses. Signed-off-by: Paul E. McKenney --- rcutorture.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff -urpNa -X dontdiff linux-2.6.26-rc4-rcut2-proc/kernel/rcutorture.c linux-2.6.26-rc4-rcut3-procq/kernel/rcutorture.c --- linux-2.6.26-rc4-rcut2-proc/kernel/rcutorture.c 2008-06-22 10:29:04.000000000 -0700 +++ linux-2.6.26-rc4-rcut3-procq/kernel/rcutorture.c 2008-06-22 12:20:10.000000000 -0700 @@ -196,7 +196,10 @@ static void rcu_stutter_wait(void) { while (stutter_pause_test || !rcutorture_runnable) - schedule_timeout_interruptible(1); + if (rcutorture_runnable) + schedule_timeout_interruptible(1); + else + schedule_timeout_interruptible(HZ); } /* -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/