Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965584AbbEMU6u (ORCPT ); Wed, 13 May 2015 16:58:50 -0400 Received: from e38.co.us.ibm.com ([32.97.110.159]:37019 "EHLO e38.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965493AbbEMU6i (ORCPT ); Wed, 13 May 2015 16:58:38 -0400 Date: Wed, 13 May 2015 08:06:25 -0700 From: "Paul E. McKenney" To: Steven Rostedt Cc: linux-kernel@vger.kernel.org, mingo@kernel.org, laijs@cn.fujitsu.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@efficios.com, josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org, dhowells@redhat.com, edumazet@google.com, dvhart@linux.intel.com, fweisbec@gmail.com, oleg@redhat.com, bobby.prani@gmail.com Subject: Re: [PATCH tip/core/rcu 24/24] rcu: Conditionally compile RCU's eqs warnings Message-ID: <20150513150625.GF6776@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <20150512223034.GA1396@linux.vnet.ibm.com> <1431469854-3826-1-git-send-email-paulmck@linux.vnet.ibm.com> <1431469854-3826-24-git-send-email-paulmck@linux.vnet.ibm.com> <20150513094648.72e03399@gandalf.local.home> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20150513094648.72e03399@gandalf.local.home> User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 15051320-0029-0000-0000-000009C2307E Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1263 Lines: 41 On Wed, May 13, 2015 at 09:46:48AM -0400, Steven Rostedt wrote: > On Tue, 12 May 2015 15:30:54 -0700 > "Paul E. McKenney" wrote: > > > --- a/lib/Kconfig.debug > > +++ b/lib/Kconfig.debug > > @@ -1373,6 +1373,17 @@ config RCU_TRACE > > Say Y here if you want to enable RCU tracing > > Say N if you are unsure. > > > > +config RCU_EQS_DEBUG > > + bool "Use this when adding any sort of NO_HZ support to your arch" > > + depends on DEBUG_KERNEL > > Should we add "depends on NO_HZ" ? No, because RCU now uses the EQS code even for NO_HZ_PERIODIC to detect idle time. Thanx, Paul > -- Steve > > > + help > > + This option provides consistency checks in RCU's handling of > > + NO_HZ. These checks have proven quite helpful in detecting > > + bugs in arch-specific NO_HZ code. > > + > > + Say N here if you need ultimate kernel/user switch latencies > > + Say Y if you are unsure > > + > > endmenu # "RCU Debugging" > > > > config DEBUG_BLOCK_EXT_DEVT > -- 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/