Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754998Ab2FSVyD (ORCPT ); Tue, 19 Jun 2012 17:54:03 -0400 Received: from ch1ehsobe004.messaging.microsoft.com ([216.32.181.184]:42865 "EHLO ch1outboundpool.messaging.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751137Ab2FSVyB (ORCPT ); Tue, 19 Jun 2012 17:54:01 -0400 X-Forefront-Antispam-Report: CIP:160.33.194.228;KIP:(null);UIP:(null);IPV:NLI;H:usculsndmail01v.am.sony.com;RD:mail01.sonyusa.com;EFVD:NLI X-SpamScore: -3 X-BigFish: VPS-3(zzbb2dI98dI1432Izz1202hzzz2fh2a8h668h839hd25hf0ah) Message-ID: <4FE0F4B3.5090705@am.sony.com> Date: Tue, 19 Jun 2012 14:52:51 -0700 From: Frank Rowand Reply-To: User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.17) Gecko/20110428 Fedora/3.1.10-1.fc14 Thunderbird/3.1.10 MIME-Version: 1.0 To: "Rowand, Frank" CC: Aaditya Kumar , "shaohua.li@intel.com" , Thomas Gleixner , "linux-kernel@vger.kernel.org" , "rostedt@goodmis.org" , "mingo@kernel.org" , "C.Emde@osadl.org" , "jkacur@redhat.com" , "Bird, Tim" , "Ohara, Takuzo" , "Iibuchi, Kan (TDG)" Subject: Re: [RFC][RT][PATCH] mm: Do not use stop_machine() for __zone_pcp_udpate() for CONFIG_PREEMPT_RT_FULL References: <4FE0D70F.2000607@am.sony.com> In-Reply-To: <4FE0D70F.2000607@am.sony.com> Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit X-OriginatorOrg: am.sony.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 886 Lines: 24 On 06/19/12 12:46, Frank Rowand wrote: > Adding to the distribution list: the author of the patch that included > the call to stop_machine() (commit 112067f0905b2de862c607ee62411cf47d2fe5c4). > > On 06/19/12 11:32, Aaditya Kumar wrote: >> The code path of __zone_pcp_update() has following locks, which in >> CONFIG_PREEMPT_RT_FULL=y are rt-mutex. >> - pa_lock locked by cpu_lock_irqsave() >> - zone->lock locked by free_pcppages_bulk() >> >> Since __zone_pcp_update() is called from stop_machine(), so with < snip > ... and just for the record, adding the author (Shaohua Li) did not work, I got an email reject from Intel. -Frank -- 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/