Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752621AbdCFCLy (ORCPT ); Sun, 5 Mar 2017 21:11:54 -0500 Received: from cn.fujitsu.com ([59.151.112.132]:20545 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1752414AbdCFCLw (ORCPT ); Sun, 5 Mar 2017 21:11:52 -0500 X-IronPort-AV: E=Sophos;i="5.22,518,1449504000"; d="scan'208";a="16224312" Subject: Re: [PATCH v3 0/5] Do repair works for the mapping of cpuid <-> nodeid To: , , , , , , , References: <1488528147-2279-1-git-send-email-douly.fnst@cn.fujitsu.com> CC: , , From: Dou Liyang Message-ID: Date: Mon, 6 Mar 2017 10:11:36 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset="gbk"; format=flowed Content-Transfer-Encoding: 8bit X-Originating-IP: [10.167.226.106] X-yoursite-MailScanner-ID: F008B47D8B79.AD462 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: douly.fnst@cn.fujitsu.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6175 Lines: 161 At 03/03/2017 04:32 PM, Dou Liyang wrote: > Hi All, > > My Simple Test Result: > > In our box: Fujitsu PQ2000 with 1 nodes for hot-plug. s/1 nodes/2 nodes in 1 SB which contains CPU, Memory.../ Thanks, Liyang > > Before the patchset: > > +-------------------------------------+ > | | > | NUMA node0 CPU?? 0-23,256-279 +------+ > | NUMA node1 CPU?? 24-47,280-303 | | > | | | > +-------------------------------------+ | > Hot-plug > +-------------------------------------+ + > | | | > | NUMA Node0: 0-23, 256-279 <------+ > | NUMA Node1: 24-47, 280-303 | > | NUMA Node2: 64|69, 72-77, 80-85, 88-93... > | NUMA Node3: 96-101, 104-109, 112-117,... > | | | > +-------------------------------------+ | > Hot-remove > +-------------------------------------+ | > | | | > | NUMA node0 CPU?? 0-23,256-279 | | > | NUMA node1 CPU?? 24-47,280-303 +^-----+ > | | > | | > +-------------------------------------+ > > After the patchset: > > +-------------------------------------+ > | | > | NUMA node0 CPU?? 0-23,48-71 +------+ > | NUMA node1 CPU?? 24-47,72-95 | | > | | | > +-------------------------------------+ | > Hot-plug > +-------------------------------------+ + > | | | > | NUMA node0 CPU?? 0-23,48-71 <------+ > | NUMA node1 CPU?? 24-47,72-95 | > | NUMA node2 CPU?? 96-143 +------+ > | NUMA node3 CPU?? 144-191 | | > | | | > +-------------------------------------+ | > Hot-remove > +-------------------------------------+ | > | | | > | NUMA node0 CPU?? 0-23,48-71 | | > | NUMA node1 CPU?? 24-47,72-95 +^-----+ > | | > | | > +-------------------------------------+ > > And I also test some cases in VMs with QEmu. > > And When I get more nodes, I will test the whole > function. > > Thanks, > Liyang. > > At 03/03/2017 04:02 PM, Dou Liyang wrote: >> [Summary]: >> >> 1, Revert two commits >> 2, Fix the order of Logical CPU IDs >> 3, Move the validation of processor IDs to hot-plug time. >> >> The mapping of "cpuid <-> nodeid" is established at boot time via ACPI >> tables to keep associations of workqueues and other node related items >> consistent across cpu hotplug as following: >> >> Step 1. Make the "Logical CPU ID <-> Processor ID/UID" fixed Using MADT: >> We generate the logical CPU IDs by the Local APIC/x2APIC IDs orderly and >> get the mapping of Processor ID/UID <-> Local Apic ID directly in MADT. >> So, we get the mapping of >> *Processor ID/UID <-> Local Apic ID <-> Logical CPU ID* >> >> Step 2. Make the "Processor ID/UID <-> Node ID(_PXM)" fixed Using DSDT: >> The maaping of "Processor ID/UID <-> Node ID(_PXM)" is ready-made in >> each entities. we just use it directly. >> >> But, ACPI tables are unreliable and failures with that boot time mapping >> have been reported on machines where the ACPI table and the physical >> information which is retrieved at actual hotplug is inconsistent. Here >> has already two bugs we found: >> >> 1. Duplicated Processor IDs in DSDT. >> It has been fixed by commits: >> '8e089eaa1999 ("acpi: Provide mechanism to validate processors >> in the ACPI tables")' and 'fd74da217df7 ("acpi: Validate processor id >> when mapping the processor")' >> >> 2. The _PXM in DSDT is inconsistent with the one in MADT. >> It may cause the bug, which is shown in: >> https://lkml.org/lkml/2017/2/12/200 >> >> And one phenomenon is happened in some specific boxes: >> >> 1. The logical CPU IDs is discrete. Such as: >> Node2: 64-69, 72-77, 80-85, 88-93,... >> >> There may be more strange things happened in the futher. We shouldn't >> just >> only fix them everytime, we should solve this problem from the source to >> avoid such problems happened again and again. >> >> Find a simple and easy way: >> >> 1. Do the step 1 when the CPU flag is enabled >> 2. Do the step 2 at hot-plug time, not at boot time when we did some >> useless work. >> >> It also can make the mapping of "cpuid <-> nodeid" fixed and avoid >> excessive using of the ACPI tables. >> >> Change log: >> v2 -> v3: 1. rewirte the changelogs >> copy the changelogs Thomas Gleixner >> rewrite for the patch 1,2,4,5. >> 2. s/duplicate_processor_id()/acpi_duplicate_processor_id(). >> by Thomas Gleixner 's advice. >> 3. modify the error handle in acpi_processor_ids_walk() >> by Thomas Gleixner 's advice. >> 4. add a new patch for restoring the order of CPU IDs >> >> v1 -> v2: 1. fix some comments. >> 2. add the verification of duplicate processor id. >> >> Dou Liyang (5): >> Revert"x86/acpi: Set persistent cpuid <-> nodeid mapping when booting" >> Revert"x86/acpi: Enable MADT APIs to return disabled apicids" >> x86/acpi: Restore the order of CPU IDs >> acpi/processor: Implement DEVICE operator for processor enumeration >> acpi/processor: Check for duplicate processor ids at hotplug time >> >> arch/x86/kernel/acpi/boot.c | 9 ++- >> arch/x86/kernel/apic/apic.c | 26 +++------ >> drivers/acpi/acpi_processor.c | 57 +++++++++++++----- >> drivers/acpi/bus.c | 1 - >> drivers/acpi/processor_core.c | 133 >> +++++++----------------------------------- >> include/linux/acpi.h | 5 +- >> 6 files changed, 79 insertions(+), 152 deletions(-) >>