From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759043Ab3BYVrW (ORCPT ); Mon, 25 Feb 2013 16:47:22 -0500 Received: from e28smtp09.in.ibm.com ([122.248.162.9]:40247 "EHLO e28smtp09.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756921Ab3BYVrT (ORCPT ); Mon, 25 Feb 2013 16:47:19 -0500 Message-ID: <512BDB61.1010204@linux.vnet.ibm.com> Date: Tue, 26 Feb 2013 03:15:05 +0530 From: "Srivatsa S. Bhat" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:15.0) Gecko/20120828 Thunderbird/15.0 MIME-Version: 1.0 To: Rusty Russell CC: tglx@linutronix.de, peterz@infradead.org, tj@kernel.org, oleg@redhat.com, paulmck@linux.vnet.ibm.com, mingo@kernel.org, akpm@linux-foundation.org, namhyung@kernel.org, rostedt@goodmis.org, wangyun@linux.vnet.ibm.com, xiaoguangrong@linux.vnet.ibm.com, rjw@sisk.pl, sbw@mit.edu, fweisbec@gmail.com, linux@arm.linux.org.uk, nikunj@linux.vnet.ibm.com, linux-pm@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, netdev@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, walken@google.com, vincent.guittot@linaro.org Subject: Re: [PATCH v6 00/46] CPU hotplug: stop_machine()-free CPU hotplug References: <20130218123714.26245.61816.stgit@srivatsabhat.in.ibm.com> <87mwuxfatp.fsf@rustcorp.com.au> In-Reply-To: <87mwuxfatp.fsf@rustcorp.com.au> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13022521-2674-0000-0000-000007F56ACD Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 02/22/2013 06:01 AM, Rusty Russell wrote: > "Srivatsa S. Bhat" writes: >> Hi, >> >> This patchset removes CPU hotplug's dependence on stop_machine() from the CPU >> offline path and provides an alternative (set of APIs) to preempt_disable() to >> prevent CPUs from going offline, which can be invoked from atomic context. >> The motivation behind the removal of stop_machine() is to avoid its ill-effects >> and thus improve the design of CPU hotplug. (More description regarding this >> is available in the patches). > > If you're doing a v7, please put your benchmark results somewhere! > Oh, I forgot to put them in v6! Thanks for reminding :-) And yes, I'll have to do a v7 to incorporate changes (if any) to the new code that went in during this merge window. > The obvious place is in the 44/46. > Ok, will add it there. Thank you! Regards, Srivatsa S. Bhat From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e28smtp08.in.ibm.com (e28smtp08.in.ibm.com [122.248.162.8]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "e28smtp08.in.ibm.com", Issuer "GeoTrust SSL CA" (not verified)) by ozlabs.org (Postfix) with ESMTPS id 58B5C2C0292 for ; Tue, 26 Feb 2013 08:47:19 +1100 (EST) Received: from /spool/local by e28smtp08.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 26 Feb 2013 03:13:37 +0530 Received: from d28relay01.in.ibm.com (d28relay01.in.ibm.com [9.184.220.58]) by d28dlp01.in.ibm.com (Postfix) with ESMTP id 485C7E0055 for ; Tue, 26 Feb 2013 03:18:16 +0530 (IST) Received: from d28av03.in.ibm.com (d28av03.in.ibm.com [9.184.220.65]) by d28relay01.in.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r1PLl8w724576136 for ; Tue, 26 Feb 2013 03:17:08 +0530 Received: from d28av03.in.ibm.com (loopback [127.0.0.1]) by d28av03.in.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id r1PLl9He009646 for ; Tue, 26 Feb 2013 08:47:12 +1100 Message-ID: <512BDB61.1010204@linux.vnet.ibm.com> Date: Tue, 26 Feb 2013 03:15:05 +0530 From: "Srivatsa S. Bhat" MIME-Version: 1.0 To: Rusty Russell Subject: Re: [PATCH v6 00/46] CPU hotplug: stop_machine()-free CPU hotplug References: <20130218123714.26245.61816.stgit@srivatsabhat.in.ibm.com> <87mwuxfatp.fsf@rustcorp.com.au> In-Reply-To: <87mwuxfatp.fsf@rustcorp.com.au> Content-Type: text/plain; charset=ISO-8859-1 Cc: linux-doc@vger.kernel.org, peterz@infradead.org, fweisbec@gmail.com, linux-kernel@vger.kernel.org, walken@google.com, mingo@kernel.org, linux-arch@vger.kernel.org, linux@arm.linux.org.uk, xiaoguangrong@linux.vnet.ibm.com, wangyun@linux.vnet.ibm.com, paulmck@linux.vnet.ibm.com, nikunj@linux.vnet.ibm.com, linux-pm@vger.kernel.org, rostedt@goodmis.org, rjw@sisk.pl, namhyung@kernel.org, tglx@linutronix.de, linux-arm-kernel@lists.infradead.org, netdev@vger.kernel.org, oleg@redhat.com, vincent.guittot@linaro.org, sbw@mit.edu, tj@kernel.org, akpm@linux-foundation.org, linuxppc-dev@lists.ozlabs.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On 02/22/2013 06:01 AM, Rusty Russell wrote: > "Srivatsa S. Bhat" writes: >> Hi, >> >> This patchset removes CPU hotplug's dependence on stop_machine() from the CPU >> offline path and provides an alternative (set of APIs) to preempt_disable() to >> prevent CPUs from going offline, which can be invoked from atomic context. >> The motivation behind the removal of stop_machine() is to avoid its ill-effects >> and thus improve the design of CPU hotplug. (More description regarding this >> is available in the patches). > > If you're doing a v7, please put your benchmark results somewhere! > Oh, I forgot to put them in v6! Thanks for reminding :-) And yes, I'll have to do a v7 to incorporate changes (if any) to the new code that went in during this merge window. > The obvious place is in the 44/46. > Ok, will add it there. Thank you! Regards, Srivatsa S. Bhat From mboxrd@z Thu Jan 1 00:00:00 1970 From: srivatsa.bhat@linux.vnet.ibm.com (Srivatsa S. Bhat) Date: Tue, 26 Feb 2013 03:15:05 +0530 Subject: [PATCH v6 00/46] CPU hotplug: stop_machine()-free CPU hotplug In-Reply-To: <87mwuxfatp.fsf@rustcorp.com.au> References: <20130218123714.26245.61816.stgit@srivatsabhat.in.ibm.com> <87mwuxfatp.fsf@rustcorp.com.au> Message-ID: <512BDB61.1010204@linux.vnet.ibm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 02/22/2013 06:01 AM, Rusty Russell wrote: > "Srivatsa S. Bhat" writes: >> Hi, >> >> This patchset removes CPU hotplug's dependence on stop_machine() from the CPU >> offline path and provides an alternative (set of APIs) to preempt_disable() to >> prevent CPUs from going offline, which can be invoked from atomic context. >> The motivation behind the removal of stop_machine() is to avoid its ill-effects >> and thus improve the design of CPU hotplug. (More description regarding this >> is available in the patches). > > If you're doing a v7, please put your benchmark results somewhere! > Oh, I forgot to put them in v6! Thanks for reminding :-) And yes, I'll have to do a v7 to incorporate changes (if any) to the new code that went in during this merge window. > The obvious place is in the 44/46. > Ok, will add it there. Thank you! Regards, Srivatsa S. Bhat