Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751546AbaDYFf6 (ORCPT ); Fri, 25 Apr 2014 01:35:58 -0400 Received: from mail-ee0-f44.google.com ([74.125.83.44]:61635 "EHLO mail-ee0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751083AbaDYFf4 (ORCPT ); Fri, 25 Apr 2014 01:35:56 -0400 Message-ID: <1398404153.7893.10.camel@marge.simpson.net> Subject: Re: [PATCH RFC] sysrq,rcu: suppress RCU stall warnings while sysrq runs From: Mike Galbraith To: Rik van Riel Cc: paulmck@linux.vnet.ibm.com, Jiri Kosina , linux-kernel@vger.kernel.org, joern@logfs.org, peterz@infradead.org, Andrew Morton , cxie@redhat.com, Greg Kroah-Hartman , Jiri Slaby Date: Fri, 25 Apr 2014 07:35:53 +0200 In-Reply-To: <20140424090452.3482f95c@annuminas.surriel.com> References: <20140423125352.704f9fb2@annuminas.surriel.com> <535833AE.6010505@redhat.com> <20140424014648.GK4496@linux.vnet.ibm.com> <20140424090452.3482f95c@annuminas.surriel.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.3 Content-Transfer-Encoding: 7bit Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 2014-04-24 at 09:04 -0400, Rik van Riel wrote: > diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c > index 4c0a9b0..2ac3289 100644 > --- a/kernel/rcu/update.c > +++ b/kernel/rcu/update.c > @@ -320,6 +320,17 @@ int rcu_jiffies_till_stall_check(void) > return till_stall_check * HZ + RCU_STALL_DELAY_DELTA; > } > > +void rcu_sysrq_start(void) > +{ > + rcu_cpu_stall_suppress = 2; > +} Monster box folks seem to routinely kill that at boot, probably won't want it coming back to life at the poke of a button. -Mike -- 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/