From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E5EA8C43470 for ; Wed, 14 Apr 2021 13:39:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C1FAE611AD for ; Wed, 14 Apr 2021 13:39:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346946AbhDNNkK (ORCPT ); Wed, 14 Apr 2021 09:40:10 -0400 Received: from outbound-smtp19.blacknight.com ([46.22.139.246]:35697 "EHLO outbound-smtp19.blacknight.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1351401AbhDNNkE (ORCPT ); Wed, 14 Apr 2021 09:40:04 -0400 Received: from mail.blacknight.com (pemlinmail01.blacknight.ie [81.17.254.10]) by outbound-smtp19.blacknight.com (Postfix) with ESMTPS id 2ADF31C620D for ; Wed, 14 Apr 2021 14:39:42 +0100 (IST) Received: (qmail 27216 invoked from network); 14 Apr 2021 13:39:42 -0000 Received: from unknown (HELO stampy.112glenside.lan) (mgorman@techsingularity.net@[84.203.22.4]) by 81.17.254.9 with ESMTPA; 14 Apr 2021 13:39:41 -0000 From: Mel Gorman To: Linux-MM , Linux-RT-Users Cc: LKML , Chuck Lever , Jesper Dangaard Brouer , Thomas Gleixner , Peter Zijlstra , Ingo Molnar , Michal Hocko , Vlastimil Babka , Mel Gorman Subject: [PATCH 0/11 v3] Use local_lock for pcp protection and reduce stat overhead Date: Wed, 14 Apr 2021 14:39:20 +0100 Message-Id: <20210414133931.4555-1-mgorman@techsingularity.net> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Changelog since v2 o Fix zonestats initialisation o Merged memory hotplug fix separately o Embed local_lock within per_cpu_pages This series requires patches in Andrew's tree so for convenience, it's also available at git://git.kernel.org/pub/scm/linux/kernel/git/mel/linux.git mm-percpu-local_lock-v3r6 The PCP (per-cpu page allocator in page_alloc.c) shares locking requirements with vmstat and the zone lock which is inconvenient and causes some issues. For example, the PCP list and vmstat share the same per-cpu space meaning that it's possible that vmstat updates dirty cache lines holding per-cpu lists across CPUs unless padding is used. Second, PREEMPT_RT does not want to disable IRQs for too long in the page allocator. This series splits the locking requirements and uses locks types more suitable for PREEMPT_RT, reduces the time when special locking is required for stats and reduces the time when IRQs need to be disabled on !PREEMPT_RT kernels. Why local_lock? PREEMPT_RT considers the following sequence to be unsafe as documented in Documentation/locking/locktypes.rst local_irq_disable(); spin_lock(&lock); The pcp allocator has this sequence for rmqueue_pcplist (local_irq_save) -> __rmqueue_pcplist -> rmqueue_bulk (spin_lock). While it's possible to separate this out, it generally means there are points where we enable IRQs and reenable them again immediately. To prevent a migration and the per-cpu pointer going stale, migrate_disable is also needed. That is a custom lock that is similar, but worse, than local_lock. Furthermore, on PREEMPT_RT, it's undesirable to leave IRQs disabled for too long. By converting to local_lock which disables migration on PREEMPT_RT, the locking requirements can be separated and start moving the protections for PCP, stats and the zone lock to PREEMPT_RT-safe equivalent locking. As a bonus, local_lock also means that PROVE_LOCKING does something useful. After that, it's obvious that zone_statistics incurs too much overhead and leaves IRQs disabled for longer than necessary on !PREEMPT_RT kernels. zone_statistics uses perfectly accurate counters requiring IRQs be disabled for parallel RMW sequences when inaccurate ones like vm_events would do. The series makes the NUMA statistics (NUMA_HIT and friends) inaccurate counters that then require no special protection on !PREEMPT_RT. The bulk page allocator can then do stat updates in bulk with IRQs enabled which should improve the efficiency. Technically, this could have been done without the local_lock and vmstat conversion work and the order simply reflects the timing of when different series were implemented. Finally, there are places where we conflate IRQs being disabled for the PCP with the IRQ-safe zone spinlock. The remainder of the series reduces the scope of what is protected by disabled IRQs on !PREEMPT_RT kernels. By the end of the series, page_alloc.c does not call local_irq_save so the locking scope is a bit clearer. The one exception is that modifying NR_FREE_PAGES still happens in places where it's known the IRQs are disabled as it's harmless for PREEMPT_RT and would be expensive to split the locking there. No performance data is included because despite the overhead of the stats, it's within the noise for most workloads on !PREEMPT_RT. However, Jesper Dangaard Brouer ran a page allocation microbenchmark on a E5-1650 v4 @ 3.60GHz CPU on the first version of this series. Focusing on the array variant of the bulk page allocator reveals the following. (CPU: Intel(R) Xeon(R) CPU E5-1650 v4 @ 3.60GHz) ARRAY variant: time_bulk_page_alloc_free_array: step=bulk size Baseline Patched 1 56.383 54.225 (+3.83%) 2 40.047 35.492 (+11.38%) 3 37.339 32.643 (+12.58%) 4 35.578 30.992 (+12.89%) 8 33.592 29.606 (+11.87%) 16 32.362 28.532 (+11.85%) 32 31.476 27.728 (+11.91%) 64 30.633 27.252 (+11.04%) 128 30.596 27.090 (+11.46%) While this is a positive outcome, the series is more likely to be interesting to the RT people in terms of getting parts of the PREEMPT_RT tree into mainline. drivers/base/node.c | 18 +-- include/linux/mmzone.h | 58 ++++++-- include/linux/vmstat.h | 65 +++++---- mm/mempolicy.c | 2 +- mm/page_alloc.c | 302 +++++++++++++++++++++++++---------------- mm/vmstat.c | 250 ++++++++++++---------------------- 6 files changed, 370 insertions(+), 325 deletions(-) -- 2.26.2 Mel Gorman (11): mm/page_alloc: Split per cpu page lists and zone stats mm/page_alloc: Convert per-cpu list protection to local_lock mm/vmstat: Convert NUMA statistics to basic NUMA counters mm/vmstat: Inline NUMA event counter updates mm/page_alloc: Batch the accounting updates in the bulk allocator mm/page_alloc: Reduce duration that IRQs are disabled for VM counters mm/page_alloc: Remove duplicate checks if migratetype should be isolated mm/page_alloc: Explicitly acquire the zone lock in __free_pages_ok mm/page_alloc: Avoid conflating IRQs disabled with zone->lock mm/page_alloc: Update PGFREE outside the zone lock in __free_pages_ok mm/page_alloc: Embed per_cpu_pages locking within the per-cpu structure drivers/base/node.c | 18 +-- include/linux/mmzone.h | 58 ++++++-- include/linux/vmstat.h | 65 +++++---- mm/mempolicy.c | 2 +- mm/page_alloc.c | 302 +++++++++++++++++++++++++---------------- mm/vmstat.c | 250 ++++++++++++---------------------- 6 files changed, 370 insertions(+), 325 deletions(-) -- 2.26.2