From patchwork Thu Dec 8 18:30:56 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yury Norov X-Patchwork-Id: 13068663 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A1AD5C4167B for ; Thu, 8 Dec 2022 18:31:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229651AbiLHSbH (ORCPT ); Thu, 8 Dec 2022 13:31:07 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46572 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229568AbiLHSbG (ORCPT ); Thu, 8 Dec 2022 13:31:06 -0500 Received: from mail-oa1-x33.google.com (mail-oa1-x33.google.com [IPv6:2001:4860:4864:20::33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9AD7D85D22; Thu, 8 Dec 2022 10:31:05 -0800 (PST) Received: by mail-oa1-x33.google.com with SMTP id 586e51a60fabf-144bd860fdbso2851355fac.0; Thu, 08 Dec 2022 10:31:05 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=XF7XmsI3z9Pewm9QLWRYHW1AFn4kiQyrTYitGbyYOV0=; b=X7yZQIpnNAhUiqJmYPIzNNFCNYaxiM7TSwgUizzX6q5+3xdIGn8EDYfOM5mh9JvgZm jau4dmjTy/lJ3MtqBD78OTglbxR7hkmpdWvHLaGkPZf4n/Ra9wxwDTKJKra0Ruc24HU+ IcPOPf2abIOtNRv74pFNGsNE7wCIo5Cz6RljxYJA4Kegwr4zv6g1IAHnAwT0PBPMM1ri 7wjhtnF58lTf/WfnpS5YiG2xCB9WE6SzLRkJrpn0rn+dMEAVZuyxb+TnWJRsfaI9CIWf 9s98bhjevgrcvTinBLHRrMx1w0x5nkTm5mez6BQLOvvcYkGetKouGqqHwd5U8CyAi/Dp 1nEA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=XF7XmsI3z9Pewm9QLWRYHW1AFn4kiQyrTYitGbyYOV0=; b=v6s2c2qwyazigahKn8SX9LpK737o65HOIzejwt+49GbZK4+LP45vQdsGl6sdjjn2Z3 KcP8OYaeEdCBHe8zVGmGFSm8UpCfe3DFgO1lfStO949BZdZZoHpUyjcWDhTWsoZjIy6U aCtysKDDUMLWxtJP3zB2L0qks/srJswcHSVSrt4NGsChGinC9DYj4cdn6kuZ+sJTl2ZH lQYDperSKjF/Qt6hlj9rzB5r48uiy+JsS2T5PFRC0Ae/IEchx7OTZvKPZYfzUnjpFuQJ KwNfnniRvSVdFsqGpdlMAK7C7x56QqVOOWYx3jyAvQta9ohI+SAn5JHsWqNwaYUHOwTu Leiw== X-Gm-Message-State: ANoB5pmrcHCUdieyN1tv+DmGHKCe1BeRPQt1D1VaT4RS/6Solt7qYeuF dsvzAsqyFOCE/E8qSBgiT0eqmN/ph9s= X-Google-Smtp-Source: AA0mqf6IgUrN864xAfLN0JG81zylBxprTCpDGfMjzGswc9Ykw20KFVxsaXlw/9FyrZMqbfHUTsJ8TA== X-Received: by 2002:a05:6870:b9ca:b0:13b:d910:5001 with SMTP id iv10-20020a056870b9ca00b0013bd9105001mr1391780oab.1.1670524264577; Thu, 08 Dec 2022 10:31:04 -0800 (PST) Received: from localhost ([12.97.180.36]) by smtp.gmail.com with ESMTPSA id k14-20020a0568080e8e00b0034d8abf42f1sm10910446oil.23.2022.12.08.10.31.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 08 Dec 2022 10:31:03 -0800 (PST) From: Yury Norov To: linux-kernel@vger.kernel.org, "David S. Miller" , Andy Shevchenko , Barry Song , Ben Segall , haniel Bristot de Oliveira , Dietmar Eggemann , Gal Pressman , Greg Kroah-Hartman , Heiko Carstens , Ingo Molnar , Jakub Kicinski , Jason Gunthorpe , Jesse Brandeburg , Jonathan Cameron , Juri Lelli , Leon Romanovsky , Mel Gorman , Peter Zijlstra , Rasmus Villemoes , Saeed Mahameed , Steven Rostedt , Tariq Toukan , Tariq Toukan , Tony Luck , Valentin Schneider , Vincent Guittot Cc: Yury Norov , linux-crypto@vger.kernel.org, netdev@vger.kernel.org, linux-rdma@vger.kernel.org Subject: [PATCH v3 0/5] cpumask: improve on cpumask_local_spread() locality Date: Thu, 8 Dec 2022 10:30:56 -0800 Message-Id: <20221208183101.1162006-1-yury.norov@gmail.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org cpumask_local_spread() currently checks local node for presence of i'th CPU, and then if it finds nothing makes a flat search among all non-local CPUs. We can do it better by checking CPUs per NUMA hops. This series is inspired by Tariq Toukan and Valentin Schneider's "net/mlx5e: Improve remote NUMA preferences used for the IRQ affinity hints" https://patchwork.kernel.org/project/netdevbpf/patch/20220728191203.4055-3-tariqt@nvidia.com/ According to their measurements, for mlx5e: Bottleneck in RX side is released, reached linerate (~1.8x speedup). ~30% less cpu util on TX. This patch makes cpumask_local_spread() traversing CPUs based on NUMA distance, just as well, and I expect comparable improvement for its users, as in case of mlx5e. I tested new behavior on my VM with the following NUMA configuration: root@debian:~# numactl -H available: 4 nodes (0-3) node 0 cpus: 0 1 2 3 node 0 size: 3869 MB node 0 free: 3740 MB node 1 cpus: 4 5 node 1 size: 1969 MB node 1 free: 1937 MB node 2 cpus: 6 7 node 2 size: 1967 MB node 2 free: 1873 MB node 3 cpus: 8 9 10 11 12 13 14 15 node 3 size: 7842 MB node 3 free: 7723 MB node distances: node 0 1 2 3 0: 10 50 30 70 1: 50 10 70 30 2: 30 70 10 50 3: 70 30 50 10 And the cpumask_local_spread() for each node and offset traversing looks like this: node 0: 0 1 2 3 6 7 4 5 8 9 10 11 12 13 14 15 node 1: 4 5 8 9 10 11 12 13 14 15 0 1 2 3 6 7 node 2: 6 7 0 1 2 3 8 9 10 11 12 13 14 15 4 5 node 3: 8 9 10 11 12 13 14 15 4 5 6 7 0 1 2 3 v1: https://lore.kernel.org/lkml/20221111040027.621646-5-yury.norov@gmail.com/T/ v2: https://lore.kernel.org/all/20221112190946.728270-3-yury.norov@gmail.com/T/ v3: - fix typo in find_nth_and_andnot_bit(); - add 5th patch that simplifies cpumask_local_spread(); - address various coding style nits. Yury Norov (5): lib/find: introduce find_nth_and_andnot_bit cpumask: introduce cpumask_nth_and_andnot sched: add sched_numa_find_nth_cpu() cpumask: improve on cpumask_local_spread() locality lib/cpumask: reorganize cpumask_local_spread() logic include/linux/cpumask.h | 20 ++++++++++++++ include/linux/find.h | 33 +++++++++++++++++++++++ include/linux/topology.h | 8 ++++++ kernel/sched/topology.c | 57 ++++++++++++++++++++++++++++++++++++++++ lib/cpumask.c | 26 +++++------------- lib/find_bit.c | 9 +++++++ 6 files changed, 134 insertions(+), 19 deletions(-) Reviewed-by: Jacob Keller Acked-by: Tariq Toukan