Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754969AbZJ3FWp (ORCPT ); Fri, 30 Oct 2009 01:22:45 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754317AbZJ3FWo (ORCPT ); Fri, 30 Oct 2009 01:22:44 -0400 Received: from e28smtp05.in.ibm.com ([59.145.155.5]:34201 "EHLO e28smtp05.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752256AbZJ3FWo (ORCPT ); Fri, 30 Oct 2009 01:22:44 -0400 Subject: [PATCH v5 0/4] pseries: Add cede support for cpu-offline To: Nathan Fontenot , Benjamin Herrenschmidt From: Gautham R Shenoy Cc: Peter Zijlstra , Balbir Singh , linux-kernel@vger.kernel.org, Dipankar Sarma , Arun R Bharadwaj , Andrew Morton , Vaidyanathan Srinivasan , linuxppc-dev@lists.ozlabs.org, Ingo Molnar Date: Fri, 30 Oct 2009 10:52:43 +0530 Message-ID: <20091030052106.25493.42109.stgit@sofia.in.ibm.com> User-Agent: StGit/0.14.3.384.g9ab0 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2854 Lines: 71 Hi, This is version 5 of patch series that provides a framework to choose the state a pseries CPU must be put to when it is offlined. Previous versions can be found here: Version 4: http://lkml.org/lkml/2009/10/9/59 Version 3: http://lkml.org/lkml/2009/9/15/164 Version 2: http://lkml.org/lkml/2009/8/28/102 Version 1: http://lkml.org/lkml/2009/8/6/236 Changes from the previous version include: - Rebased against Nathan Fontenot's latest "pseries kernel handling of dynamic logical paritioning v4" patches found here: http://lkml.org/lkml/2009/10/21/98 - Added boot-time option to disable putting the offlined vcpus into an extended H_CEDE state. - Addressed Ben's comments regarding the if-else sequencing in pseries_mach_cpu_die(). - Addition of comments for pseries_cpu_die() to distinguish it from pseries_mach_cpu_die() Also, - This approach addresses Peter Z's objections regarding layering violations. The user simply offlines the cpu and doesn't worry about what state the CPU should be put into. That part is automatically handled by the kernel. - It does not add any additional sysfs interface instead uses the existing sysfs interface to offline CPUs. - On platforms which do not have support for ceding the vcpu with a latency specifier value, the offlining mechanism defaults to the current method of calling rtas_stop_self(). The patchset has been tested on the available pseries platforms and it works as per the expectations. I believe that the patch set is ready for inclusion. --- Gautham R Shenoy (4): pseries: Serialize cpu hotplug operations during deactivate Vs deallocate pseries: Add code to online/offline CPUs of a DLPAR node. pSeries: Add hooks to put the CPU into an appropriate offline state pSeries: extended_cede_processor() helper function. Documentation/cpu-hotplug.txt | 6 + arch/powerpc/include/asm/lppaca.h | 9 + arch/powerpc/platforms/pseries/dlpar.c | 129 ++++++++++++++++ arch/powerpc/platforms/pseries/hotplug-cpu.c | 182 ++++++++++++++++++++++- arch/powerpc/platforms/pseries/offline_states.h | 18 ++ arch/powerpc/platforms/pseries/plpar_wrappers.h | 22 +++ arch/powerpc/platforms/pseries/smp.c | 19 ++ arch/powerpc/xmon/xmon.c | 3 drivers/base/cpu.c | 2 include/linux/cpu.h | 13 ++ 10 files changed, 387 insertions(+), 16 deletions(-) create mode 100644 arch/powerpc/platforms/pseries/offline_states.h -- Thanks and Regards gautham. -- 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/