From patchwork Wed Feb 6 15:56:42 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Bringmann X-Patchwork-Id: 1037614 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 43vmLl1tJNz9sDL for ; Thu, 7 Feb 2019 02:58:07 +1100 (AEDT) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=linux.vnet.ibm.com Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 43vmLl0LwmzDqRn for ; Thu, 7 Feb 2019 02:58:07 +1100 (AEDT) X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Authentication-Results: lists.ozlabs.org; spf=none (mailfrom) smtp.mailfrom=linux.vnet.ibm.com (client-ip=148.163.156.1; helo=mx0a-001b2d01.pphosted.com; envelope-from=mwb@linux.vnet.ibm.com; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=linux.vnet.ibm.com Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 43vmKJ2rjnzDqJs for ; Thu, 7 Feb 2019 02:56:52 +1100 (AEDT) Received: from pps.filterd (m0098409.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x16Ftdtf086673 for ; Wed, 6 Feb 2019 10:56:50 -0500 Received: from e15.ny.us.ibm.com (e15.ny.us.ibm.com [129.33.205.205]) by mx0a-001b2d01.pphosted.com with ESMTP id 2qg1jj4ey0-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Wed, 06 Feb 2019 10:56:49 -0500 Received: from localhost by e15.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Wed, 6 Feb 2019 15:56:45 -0000 Received: from b01ledav003.gho.pok.ibm.com (b01ledav003.gho.pok.ibm.com [9.57.199.108]) by b01cxnp22033.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x16FuiTq13893860 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 6 Feb 2019 15:56:44 GMT Received: from b01ledav003.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 1B389B205F; Wed, 6 Feb 2019 15:56:44 +0000 (GMT) Received: from b01ledav003.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id BB353B2064; Wed, 6 Feb 2019 15:56:42 +0000 (GMT) Received: from oc8380061452.ibm.com (unknown [9.80.222.60]) by b01ledav003.gho.pok.ibm.com (Postfix) with ESMTP; Wed, 6 Feb 2019 15:56:42 +0000 (GMT) To: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org From: Michael Bringmann Subject: [PATCH v03] powerpc/numa: Perform full re-add of CPU for PRRN/VPHN topology update Openpgp: preference=signencrypt Autocrypt: addr=mwb@linux.vnet.ibm.com; prefer-encrypt=mutual; keydata= mQENBFcY7GcBCADzw3en+yzo9ASFGCfldVkIg95SAMPK0myXp2XJYET3zT45uBsX/uj9/2nA lBmXXeOSXnPfJ9V3vtiwcfATnWIsVt3tL6n1kqikzH9nXNxZT7MU/7gqzWZngMAWh/GJ9qyg DTOZdjsvdUNUWxtiLvBo7y+reA4HjlQhwhYxxvCpXBeRoF0qDWfQ8DkneemqINzDZPwSQ7zY t4F5iyN1I9GC5RNK8Y6jiKmm6bDkrrbtXPOtzXKs0J0FqWEIab/u3BDrRP3STDVPdXqViHua AjEzthQbGZm0VCxI4a7XjMi99g614/qDcXZCs00GLZ/VYIE8hB9C5Q+l66S60PLjRrxnABEB AAG0LU1pY2hhZWwgVy4gQnJpbmdtYW5uIDxtd2JAbGludXgudm5ldC5pYm0uY29tPokBOAQT AQIAIgUCVxjsZwIbAwYLCQgHAwIGFQgCCQoLBBYCAwECHgECF4AACgkQSEdag3dpuTI0NAf8 CKYTDKQLgOSjVrU2L5rM4lXaJRmQV6oidD3vIhKSnWRvPq9C29ifRG6ri20prTHAlc0vycgm 41HHg0y2vsGgNXGTWC2ObemoZBI7mySXe/7Tq5mD/semGzOp0YWZ7teqrkiSR8Bw0p+LdE7K QmT7tpjjvuhrtQ3RRojUYcuy1nWUsc4D+2cxsnZslsx84FUKxPbLagDgZmgBhUw/sUi40s6S AkdViVCVS0WANddLIpG0cfdsV0kCae/XdjK3mRK6drFKv1z+QFjvOhc8QIkkxFD0da9w3tJj oqnqHFV5gLcHO6/wizPx/NV90y6RngeBORkQiRFWxTXS4Oj9GVI/UrkBDQRXGOxnAQgAmJ5Y ikTWrMWPfiveUacETyEhWVl7u8UhZcx3yy2te8O0ay7t9fYcZgIEfQPPVVus89acIXlG3wYL DDPvb21OprLxi+ZJ2a0S5we+LcSWN1jByxJlbWBq+/LcMtGAOhNLpysY1gD0Y4UW/eKS+TFZ 562qKC3k1dBvnV9JXCgeS1taYFxRdVAn+2DwK3nuyG/DDq/XgJ5BtmyC3MMx8CiW3POj+O+l 6SedIeAfZlZ7/xhijx82g93h07VavUQRwMZgZFsqmuxBxVGiav2HB+dNvs3PFB087Pvc9OHe qhajPWOP/gNLMmvBvknn1NToM9a8/E8rzcIZXoYs4RggRRYh6wARAQABiQEfBBgBAgAJBQJX GOxnAhsMAAoJEEhHWoN3abky+RUH/jE08/r5QzaNKYeVhu0uVbgXu5fsxqr2cAxhf+KuwT3T efhEP2alarxzUZdEh4MsG6c+X2NYLbD3cryiXxVx/7kSAJEFQJfA5P06g8NLR25Qpq9BLsN7 ++dxQ+CLKzSEb1X24hYAJZpOhS8ev3ii+M/XIo+olDBKuTaTgB6elrg3CaxUsVgLBJ+jbRkW yQe2S5f/Ja1ThDpSSLLWLiLK/z7+gaqwhnwjQ8Z8Y9D2itJQcj4itHilwImsqwLG7SxzC0NX IQ5KaAFYdRcOgwR8VhhkOIVd70ObSZU+E4pTET1WDz4o65xZ89yfose1No0+r5ht/xWOOrh8 53/hcWvxHVs= Organization: IBM Linux Technology Center Date: Wed, 6 Feb 2019 09:56:42 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.5.0 MIME-Version: 1.0 Content-Language: en-US X-TM-AS-GCONF: 00 x-cbid: 19020615-0068-0000-0000-0000038ED9AD X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00010548; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000279; SDB=6.01157182; UDB=6.00603690; IPR=6.00937711; MB=3.00025465; MTD=3.00000008; XFM=3.00000015; UTC=2019-02-06 15:56:47 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19020615-0069-0000-0000-0000476866B6 Message-Id: <305ed693-ea85-8a70-1d3c-ae405aebc0ad@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-02-06_10:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1902060123 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Rob Herring , Srikar Dronamraju , Kees Cook , Nicholas Piggin , Al Viro , Michael Bringmann , Juliet Kim , Oliver O'Halloran , Corentin Labbe , Nathan Lynch , Thomas Falcon , Guenter Roeck , Tyrel Datwyler Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" On pseries systems, performing changes to a partition's affinity can result in altering the nodes a CPU is assigned to the current system. For example, some systems are subject to resource balancing operations by the operator or control software. In such environments, system CPUs may be in node 1 and 3 at boot, and be moved to nodes 2, 3, and 5, for better performance. The current implementation attempts to recognize such changes within the powerpc-specific version of arch_update_cpu_topology to modify a range of system data structures directly. However, some scheduler data structures may be inaccessible, or the timing of a node change may still lead to corruption or error in other modules (e.g. user space) which do not receive notification of these changes. This patch modifies the PRRN/VPHN topology update worker function to recognize an affinity change for a CPU, and to perform a full DLPAR remove and add of the CPU instead of dynamically changing its node to resolve this issue. [Based upon patch submission: Subject: [PATCH] powerpc/pseries: Perform full re-add of CPU for topology update post-migration From: Nathan Fontenot Date: Tue Oct 30 05:43:36 AEDT 2018 ] [Replace patch submission: Subject: [PATCH] powerpc/topology: Update numa mask when cpu node mapping changes From: Srikar Dronamraju Date: Wed Oct 10 15:24:46 AEDT 2018 ] Signed-off-by: Michael Bringmann --- Changes in v03: -- Fixed under-scheduling of topo updates. Changes in v02: -- Reuse more of the previous implementation to reduce patch size -- Replace former calls to numa_update_cpu_topology(false) by topology_schedule_update -- Make sure that we report topology changes back through arch_update_cpu_topology -- Fix problem observed in powerpc next kernel with updating cpu_associativity_changes_mask in timer_topology_fn when both prrn_enabled and vphn_enabled, and many extra CPUs are possible, but not installed. -- Fix problem with updating cpu_associativity_changes_mask when VPHN associativity information does not arrive until after first call to update topology occurs. --- arch/powerpc/include/asm/topology.h | 7 +--- arch/powerpc/kernel/rtasd.c | 2 + arch/powerpc/mm/numa.c | 69 +++++++++++++++++++++++------------ 3 files changed, 48 insertions(+), 30 deletions(-) diff --git a/arch/powerpc/include/asm/topology.h b/arch/powerpc/include/asm/topology.h index f85e2b0..79505c3 100644 --- a/arch/powerpc/include/asm/topology.h +++ b/arch/powerpc/include/asm/topology.h @@ -42,7 +42,7 @@ static inline int pcibus_to_node(struct pci_bus *bus) extern int sysfs_add_device_to_node(struct device *dev, int nid); extern void sysfs_remove_device_from_node(struct device *dev, int nid); -extern int numa_update_cpu_topology(bool cpus_locked); +extern void topology_schedule_update(void); static inline void update_numa_cpu_lookup_table(unsigned int cpu, int node) { @@ -77,10 +77,7 @@ static inline void sysfs_remove_device_from_node(struct device *dev, { } -static inline int numa_update_cpu_topology(bool cpus_locked) -{ - return 0; -} +static inline void topology_schedule_update(void) {} static inline void update_numa_cpu_lookup_table(unsigned int cpu, int node) {} diff --git a/arch/powerpc/kernel/rtasd.c b/arch/powerpc/kernel/rtasd.c index 8a1746d..b1828de 100644 --- a/arch/powerpc/kernel/rtasd.c +++ b/arch/powerpc/kernel/rtasd.c @@ -285,7 +285,7 @@ static void handle_prrn_event(s32 scope) * the RTAS event. */ pseries_devicetree_update(-scope); - numa_update_cpu_topology(false); + topology_schedule_update(); } static void handle_rtas_event(const struct rtas_error_log *log) diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c index ef6bdf1..a750ec0 100644 --- a/arch/powerpc/mm/numa.c +++ b/arch/powerpc/mm/numa.c @@ -1077,6 +1077,9 @@ struct topology_update_data { static void reset_topology_timer(void); static int topology_timer_secs = 1; static int topology_inited; +static int topology_update_in_progress; +static int topology_changed; +static unsigned long topology_scans; /* * Change polling interval for associativity changes. @@ -1297,9 +1300,9 @@ static int update_lookup_table(void *data) * Update the node maps and sysfs entries for each cpu whose home node * has changed. Returns 1 when the topology has changed, and 0 otherwise. * - * cpus_locked says whether we already hold cpu_hotplug_lock. + * readd_cpus: Also readd any CPUs that have changed affinity */ -int numa_update_cpu_topology(bool cpus_locked) +static int numa_update_cpu_topology(bool readd_cpus) { unsigned int cpu, sibling, changed = 0; struct topology_update_data *updates, *ud; @@ -1307,7 +1310,8 @@ int numa_update_cpu_topology(bool cpus_locked) struct device *dev; int weight, new_nid, i = 0; - if (!prrn_enabled && !vphn_enabled && topology_inited) + if ((!prrn_enabled && !vphn_enabled && topology_inited) || + topology_update_in_progress) return 0; weight = cpumask_weight(&cpu_associativity_changes_mask); @@ -1318,6 +1322,8 @@ int numa_update_cpu_topology(bool cpus_locked) if (!updates) return 0; + topology_update_in_progress = 1; + cpumask_clear(&updated_cpus); for_each_cpu(cpu, &cpu_associativity_changes_mask) { @@ -1339,16 +1345,21 @@ int numa_update_cpu_topology(bool cpus_locked) new_nid = find_and_online_cpu_nid(cpu); - if (new_nid == numa_cpu_lookup_table[cpu]) { + if ((new_nid == numa_cpu_lookup_table[cpu]) || + !cpu_present(cpu)) { cpumask_andnot(&cpu_associativity_changes_mask, &cpu_associativity_changes_mask, cpu_sibling_mask(cpu)); - dbg("Assoc chg gives same node %d for cpu%d\n", + if (cpu_present(cpu)) + dbg("Assoc chg gives same node %d for cpu%d\n", new_nid, cpu); cpu = cpu_last_thread_sibling(cpu); continue; } + if (readd_cpus) + dlpar_cpu_readd(cpu); + for_each_cpu(sibling, cpu_sibling_mask(cpu)) { ud = &updates[i++]; ud->next = &updates[i]; @@ -1390,23 +1401,15 @@ int numa_update_cpu_topology(bool cpus_locked) if (!cpumask_weight(&updated_cpus)) goto out; - if (cpus_locked) - stop_machine_cpuslocked(update_cpu_topology, &updates[0], - &updated_cpus); - else - stop_machine(update_cpu_topology, &updates[0], &updated_cpus); + stop_machine(update_cpu_topology, &updates[0], &updated_cpus); /* * Update the numa-cpu lookup table with the new mappings, even for * offline CPUs. It is best to perform this update from the stop- * machine context. */ - if (cpus_locked) - stop_machine_cpuslocked(update_lookup_table, &updates[0], - cpumask_of(raw_smp_processor_id())); - else - stop_machine(update_lookup_table, &updates[0], - cpumask_of(raw_smp_processor_id())); + stop_machine(update_lookup_table, &updates[0], + cpumask_of(raw_smp_processor_id())); for (ud = &updates[0]; ud; ud = ud->next) { unregister_cpu_under_node(ud->cpu, ud->old_nid); @@ -1420,35 +1423,53 @@ int numa_update_cpu_topology(bool cpus_locked) } out: + topology_changed = changed; + topology_update_in_progress = 0; kfree(updates); return changed; } int arch_update_cpu_topology(void) { - return numa_update_cpu_topology(true); + int changed = topology_changed; + + topology_changed = 0; + return changed; } static void topology_work_fn(struct work_struct *work) { - rebuild_sched_domains(); + lock_device_hotplug(); + if (numa_update_cpu_topology(true)) + rebuild_sched_domains(); + unlock_device_hotplug(); } static DECLARE_WORK(topology_work, topology_work_fn); -static void topology_schedule_update(void) +void topology_schedule_update(void) { - schedule_work(&topology_work); + if (!topology_update_in_progress) + schedule_work(&topology_work); } static void topology_timer_fn(struct timer_list *unused) { + bool sdo = false; + + if (topology_scans < 1) + bitmap_fill(cpumask_bits(&cpu_associativity_changes_mask), + nr_cpumask_bits); + if (prrn_enabled && cpumask_weight(&cpu_associativity_changes_mask)) - topology_schedule_update(); - else if (vphn_enabled) { + sdo = true; + if (vphn_enabled) { if (update_cpu_associativity_changes_mask() > 0) - topology_schedule_update(); + sdo = true; reset_topology_timer(); } + if (sdo) + topology_schedule_update(); + topology_scans++; } static struct timer_list topology_timer; @@ -1561,7 +1582,7 @@ void __init shared_proc_topology_init(void) if (lppaca_shared_proc(get_lppaca())) { bitmap_fill(cpumask_bits(&cpu_associativity_changes_mask), nr_cpumask_bits); - numa_update_cpu_topology(false); + topology_schedule_update(); } }