Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752171Ab3FJDwU (ORCPT ); Sun, 9 Jun 2013 23:52:20 -0400 Received: from fgwmail6.fujitsu.co.jp ([192.51.44.36]:34690 "EHLO fgwmail6.fujitsu.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751665Ab3FJDwR (ORCPT ); Sun, 9 Jun 2013 23:52:17 -0400 X-SecurityPolicyCheck: OK by SHieldMailChecker v1.7.4 Message-ID: <51B54D51.2070505@jp.fujitsu.com> Date: Mon, 10 Jun 2013 12:51:45 +0900 From: Yasuaki Ishimatsu User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:17.0) Gecko/20130509 Thunderbird/17.0.6 MIME-Version: 1.0 To: li guang CC: "Rafael J. Wysocki" , Len Brown , Matthew Garrett , , , , =?UTF-8?B?QW5kcmVhcyBGw6RyYmVy?= , Igor Mammedov Subject: Re: [PATCH RFC v2 0/3] add cpu physically hotplug driver References: <1370482835-764-1-git-send-email-lig.fnst@cn.fujitsu.com> <5449620.11SBDUltzF@vostro.rjw.lan> <1370824567.21655.10.camel@liguang.fnst.cn.fujitsu.com> In-Reply-To: <1370824567.21655.10.camel@liguang.fnst.cn.fujitsu.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit X-SecurityPolicyCheck-GC: OK by FENCE-Mail Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2754 Lines: 80 2013/06/10 9:36, li guang wrote: > Hi, Rafael > > 在 2013-06-06四的 13:00 +0200，Rafael J. Wysocki写道： >> On Thursday, June 06, 2013 09:40:32 AM liguang wrote: >>> This patch-set try to support physically hot-plug/unplug >>> a cpu automatically, that is: >>> if you offline a cpu, it will automatically actually remove >>> a cpu, and if you hot-plug a cpu, then it will online this >>> cpu automatically. >> >> No and no. > > Hmm... are you saying cpu online/offline designed to distinguish > with real cpu plug/unplug? > but, what the actual usage of online/offline? > forgive my foolish. > >> >> Why do you need this? >> > > e.g. for QEMU case, if hot-plug a cpu, > we have to online a cpu manually if there's > no user space support like udev to do it automatically. I could not understand why you do not use udev. Please explain in detail. > and also, I think maybe online/offline should be naturally > integrated with real plug/unplug process of CPU. I could not understand this explanation too. Why do we need it? Thanks, Yasuaki Ishimatsu > >> >> >>> so, offline is just like eject, but eject attribute seems not >>> available since recent kernel(can't figure out when), with >>> this driver, if allowed, it will trigger a eject cpu process. >>> and for automatically online, it was said there are objections, >>> don't know the reason, so, send this patch-set boldly. >>> >>> of course, this approach is for QEMU 's hotplug cpu emulation >>> only, but not limited, if someone like to explore ec space to >>> implment cpu hot-plug/unplug for real platform please >>> feel free to continue. >>> >>> Li Guang (3) >>> drivers/platform/x86: add cpu physically hotplug driver >>> ec: add ec space notifier >>> cpu_physic_hotplug: register handler for ec space notifier >>> >>> drivers/acpi/ec.c | 32 ++++++++++++++++++++++++++++++++ >>> drivers/platform/x86/Kconfig | 8 ++++ >>> drivers/platform/x86/Makefile | 1 + >>> drivers/platform/x86/cpu_physic_hotplug.c | 90 +++++++++++++++++++++++++++++ >>> include/linux/acpi.h | 2 ++ >>> 5 files changed, 130 insertions(+), 3 deletions(-) >>> create mode 100644 drivers/platform/x86/cpu_physic_hotplug.c > > > -- > 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/ > -- 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/