From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Zijlstra Date: Mon, 26 Mar 2012 07:59:06 +0000 Subject: Re: [PATCH v2.1 01/10] cpu: Introduce clear_tasks_mm_cpumask() helper Message-Id: <1332748746.16159.62.camel@twins> List-Id: References: <20120324102609.GA28356@lizard> <20120324102751.GA29067@lizard> <1332593021.16159.27.camel@twins> <20120324164316.GB3640@lizard> <20120325174210.GA23605@redhat.com> In-Reply-To: <20120325174210.GA23605@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-arm-kernel@lists.infradead.org On Sun, 2012-03-25 at 19:42 +0200, Oleg Nesterov wrote: > __cpu_disable() is called by __stop_machine(), we know that nobody > can preempt us and other CPUs can do nothing. It would be very good to not rely on that though, I would love to get rid of the stop_machine usage in cpu hotplug some day. From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Message-ID: <1332748746.16159.62.camel@twins> From: Peter Zijlstra Date: Mon, 26 Mar 2012 09:59:06 +0200 In-Reply-To: <20120325174210.GA23605@redhat.com> References: <20120324102609.GA28356@lizard> <20120324102751.GA29067@lizard> <1332593021.16159.27.camel@twins> <20120324164316.GB3640@lizard> <20120325174210.GA23605@redhat.com> Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org Subject: Re: [PATCH v2.1 01/10] cpu: Introduce clear_tasks_mm_cpumask() helper To: Oleg Nesterov Cc: Anton Vorontsov , Andrew Morton , Russell King , Mike Frysinger , Benjamin Herrenschmidt , Richard Weinberger , Paul Mundt , KOSAKI Motohiro , John Stultz , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, uclinux-dist-devel@blackfin.uclinux.org, linuxppc-dev@lists.ozlabs.org, linux-sh@vger.kernel.org, user-mode-linux-devel@lists.sourceforge.net, linux-mm@kvack.org List-ID: On Sun, 2012-03-25 at 19:42 +0200, Oleg Nesterov wrote: > __cpu_disable() is called by __stop_machine(), we know that nobody > can preempt us and other CPUs can do nothing. It would be very good to not rely on that though, I would love to get rid of the stop_machine usage in cpu hotplug some day. From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from merlin.infradead.org (merlin.infradead.org [IPv6:2001:4978:20e::2]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id ABDD3B6F9F for ; Mon, 26 Mar 2012 18:59:49 +1100 (EST) Message-ID: <1332748746.16159.62.camel@twins> Subject: Re: [PATCH v2.1 01/10] cpu: Introduce clear_tasks_mm_cpumask() helper From: Peter Zijlstra To: Oleg Nesterov Date: Mon, 26 Mar 2012 09:59:06 +0200 In-Reply-To: <20120325174210.GA23605@redhat.com> References: <20120324102609.GA28356@lizard> <20120324102751.GA29067@lizard> <1332593021.16159.27.camel@twins> <20120324164316.GB3640@lizard> <20120325174210.GA23605@redhat.com> Content-Type: text/plain; charset="ISO-8859-1" Mime-Version: 1.0 Cc: Mike Frysinger , user-mode-linux-devel@lists.sourceforge.net, linux-sh@vger.kernel.org, Richard Weinberger , linux-kernel@vger.kernel.org, uclinux-dist-devel@blackfin.uclinux.org, linux-mm@kvack.org, Anton Vorontsov , Paul Mundt , John Stultz , KOSAKI Motohiro , Russell King , Andrew Morton , linuxppc-dev@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Sun, 2012-03-25 at 19:42 +0200, Oleg Nesterov wrote: > __cpu_disable() is called by __stop_machine(), we know that nobody > can preempt us and other CPUs can do nothing.=20 It would be very good to not rely on that though, I would love to get rid of the stop_machine usage in cpu hotplug some day. From mboxrd@z Thu Jan 1 00:00:00 1970 From: a.p.zijlstra@chello.nl (Peter Zijlstra) Date: Mon, 26 Mar 2012 09:59:06 +0200 Subject: [PATCH v2.1 01/10] cpu: Introduce clear_tasks_mm_cpumask() helper In-Reply-To: <20120325174210.GA23605@redhat.com> References: <20120324102609.GA28356@lizard> <20120324102751.GA29067@lizard> <1332593021.16159.27.camel@twins> <20120324164316.GB3640@lizard> <20120325174210.GA23605@redhat.com> Message-ID: <1332748746.16159.62.camel@twins> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Sun, 2012-03-25 at 19:42 +0200, Oleg Nesterov wrote: > __cpu_disable() is called by __stop_machine(), we know that nobody > can preempt us and other CPUs can do nothing. It would be very good to not rely on that though, I would love to get rid of the stop_machine usage in cpu hotplug some day. From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx115.postini.com [74.125.245.115]) by kanga.kvack.org (Postfix) with SMTP id 246936B0044 for ; Mon, 26 Mar 2012 03:59:41 -0400 (EDT) Message-ID: <1332748746.16159.62.camel@twins> Subject: Re: [PATCH v2.1 01/10] cpu: Introduce clear_tasks_mm_cpumask() helper From: Peter Zijlstra Date: Mon, 26 Mar 2012 09:59:06 +0200 In-Reply-To: <20120325174210.GA23605@redhat.com> References: <20120324102609.GA28356@lizard> <20120324102751.GA29067@lizard> <1332593021.16159.27.camel@twins> <20120324164316.GB3640@lizard> <20120325174210.GA23605@redhat.com> Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 Sender: owner-linux-mm@kvack.org List-ID: To: Oleg Nesterov Cc: Anton Vorontsov , Andrew Morton , Russell King , Mike Frysinger , Benjamin Herrenschmidt , Richard Weinberger , Paul Mundt , KOSAKI Motohiro , John Stultz , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, uclinux-dist-devel@blackfin.uclinux.org, linuxppc-dev@lists.ozlabs.org, linux-sh@vger.kernel.org, user-mode-linux-devel@lists.sourceforge.net, linux-mm@kvack.org On Sun, 2012-03-25 at 19:42 +0200, Oleg Nesterov wrote: > __cpu_disable() is called by __stop_machine(), we know that nobody > can preempt us and other CPUs can do nothing.=20 It would be very good to not rely on that though, I would love to get rid of the stop_machine usage in cpu hotplug some day. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. 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