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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Daniel Bristot de Oliveira , Pawel Chmielewski , Jacob Keller , Yury Norov Subject: [PATCH 1/4] net: mellanox: drop mlx5_cpumask_default_spread() Date: Sun, 24 Sep 2023 19:05:25 -0700 Message-Id: <20230925020528.777578-2-yury.norov@gmail.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230925020528.777578-1-yury.norov@gmail.com> References: <20230925020528.777578-1-yury.norov@gmail.com> MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (howler.vger.email [0.0.0.0]); Sun, 24 Sep 2023 19:05:44 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1777997143060491762 X-GMAIL-MSGID: 1777997143060491762 The function duplicates existing cpumask_local_spread(), and it's O(N), while cpumask_local_spread() implementation is based on bsearch, and thus is O(log n), so drop mlx5_cpumask_default_spread() and use generic cpumask_local_spread(). Signed-off-by: Yury Norov Signed-off-by: Yury Norov Reviewed-by: Jacob Keller --- drivers/net/ethernet/mellanox/mlx5/core/eq.c | 28 ++------------------ 1 file changed, 2 insertions(+), 26 deletions(-) diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eq.c b/drivers/net/ethernet/mellanox/mlx5/core/eq.c index ea0405e0a43f..bd9f857cc52d 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/eq.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/eq.c @@ -828,30 +828,6 @@ static void comp_irq_release_pci(struct mlx5_core_dev *dev, u16 vecidx) mlx5_irq_release_vector(irq); } -static int mlx5_cpumask_default_spread(int numa_node, int index) -{ - const struct cpumask *prev = cpu_none_mask; - const struct cpumask *mask; - int found_cpu = 0; - int i = 0; - int cpu; - - rcu_read_lock(); - for_each_numa_hop_mask(mask, numa_node) { - for_each_cpu_andnot(cpu, mask, prev) { - if (i++ == index) { - found_cpu = cpu; - goto spread_done; - } - } - prev = mask; - } - -spread_done: - rcu_read_unlock(); - return found_cpu; -} - static struct cpu_rmap *mlx5_eq_table_get_pci_rmap(struct mlx5_core_dev *dev) { #ifdef CONFIG_RFS_ACCEL @@ -873,7 +849,7 @@ static int comp_irq_request_pci(struct mlx5_core_dev *dev, u16 vecidx) int cpu; rmap = mlx5_eq_table_get_pci_rmap(dev); - cpu = mlx5_cpumask_default_spread(dev->priv.numa_node, vecidx); + cpu = cpumask_local_spread(vecidx, dev->priv.numa_node); irq = mlx5_irq_request_vector(dev, cpu, vecidx, &rmap); if (IS_ERR(irq)) return PTR_ERR(irq); @@ -1125,7 +1101,7 @@ int mlx5_comp_vector_get_cpu(struct mlx5_core_dev *dev, int vector) if (mask) cpu = cpumask_first(mask); else - cpu = mlx5_cpumask_default_spread(dev->priv.numa_node, vector); + cpu = cpumask_local_spread(vector, dev->priv.numa_node); return cpu; } From patchwork Mon Sep 25 02:05:26 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yury Norov X-Patchwork-Id: 144246 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:cae8:0:b0:403:3b70:6f57 with SMTP id r8csp1038567vqu; Mon, 25 Sep 2023 00:40:18 -0700 (PDT) X-Google-Smtp-Source: AGHT+IGB0Sp8ie+PT57xCcI6XnIC7W9IelnO820ElY79bUFt25U0o2C3lGP0TSt5lEt2DLhE9lno X-Received: by 2002:a17:902:f689:b0:1bf:7dfd:5b05 with SMTP id l9-20020a170902f68900b001bf7dfd5b05mr14691367plg.27.1695627617998; Mon, 25 Sep 2023 00:40:17 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1695627617; cv=none; d=google.com; s=arc-20160816; b=brU9x7U//IICh3vw8bTukwevKTACyDqKf8NjbrX/oJ2Lit5q3o3UxzAuRgEo0X4UJF MugRY3jz41Fhe4SNv1eZgnhyMGOgF4YvNdZ8APYrT9IT2qSaBYK9eZvsTRLAEXgw6mvA uBMa/hS8elLwEk7xQGO20tyE4vs8nPv3pWftVgRm00tsikkan7GxI6FMCO4Ha7h8wd9q xivkrn4IYKWVE8OWXGjZytJHBU9TDO8l4Dzer67hXpi58CY+ihDVdd2zJ5fALsvqd22B hDMlcMjjtjbwjANqEG56F+m/0e58Y9aglHoScZudCGbs+WFTJrBv3mVqpv71YH7RPfeR W2Zw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=Pl7WIkiSe4Zaq2jneMkE5sjlyOmEq/BXI+Yuo8w6qpI=; fh=Vh9RxN0PFG+ubDo7tRHLWjvF26T+zSFG6b8Rw8sy3lQ=; b=RqIzSPT0F504fqe47rMrtqtmcVNI6Ug+zSTVa+XzRG02sWb/PxTefCctrpUlY4b8pF jgq3c2Njvgim6khqicEy+t9qrXWV9LXJV2daWRZgKWhF7DnbIYA0HSbuAajtNIXVSfWb wcT09FXKz9q4o4FRNvakcrJhgorXiO8UTdC39U0M09WwdBEQl2Ag5VATJIdDWKC6kUuO V+Jw20Tnc4M/97FwznC4KLhGK2pxPNxAhp47gx5i0DGBVi/uQth6COOrior+DsF7Eza9 QQbpBZnJDmEdEn5DWg21RncgiC8EGbq/bb9k4sonUFmfnzq1tOZnvDDBS9jPAE8hQYGe fK6w== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@gmail.com header.s=20230601 header.b=lRhDeWns; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.36 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: from pete.vger.email (pete.vger.email. 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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Daniel Bristot de Oliveira , Pawel Chmielewski , Jacob Keller , Yury Norov Subject: [PATCH 2/4] Revert "sched/topology: Introduce for_each_numa_hop_mask()" Date: Sun, 24 Sep 2023 19:05:26 -0700 Message-Id: <20230925020528.777578-3-yury.norov@gmail.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230925020528.777578-1-yury.norov@gmail.com> References: <20230925020528.777578-1-yury.norov@gmail.com> MIME-Version: 1.0 X-Spam-Status: No, score=-0.6 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on pete.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (pete.vger.email [0.0.0.0]); Sun, 24 Sep 2023 19:06:15 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1777994425394123986 X-GMAIL-MSGID: 1777994425394123986 Now that the only user of for_each_numa_hop_mask() is switched to using cpumask_local_spread(), for_each_numa_hop_mask() is a dead code. Thus, revert commit 06ac01721f7d ("sched/topology: Introduce for_each_numa_hop_mask()"). Signed-off-by: Yury Norov Signed-off-by: Yury Norov Reviewed-by: Jacob Keller --- include/linux/topology.h | 18 ------------------ 1 file changed, 18 deletions(-) diff --git a/include/linux/topology.h b/include/linux/topology.h index fea32377f7c7..344c2362755a 100644 --- a/include/linux/topology.h +++ b/include/linux/topology.h @@ -261,22 +261,4 @@ sched_numa_hop_mask(unsigned int node, unsigned int hops) } #endif /* CONFIG_NUMA */ -/** - * for_each_numa_hop_mask - iterate over cpumasks of increasing NUMA distance - * from a given node. - * @mask: the iteration variable. - * @node: the NUMA node to start the search from. - * - * Requires rcu_lock to be held. - * - * Yields cpu_online_mask for @node == NUMA_NO_NODE. - */ -#define for_each_numa_hop_mask(mask, node) \ - for (unsigned int __hops = 0; \ - mask = (node != NUMA_NO_NODE || __hops) ? \ - sched_numa_hop_mask(node, __hops) : \ - cpu_online_mask, \ - !IS_ERR_OR_NULL(mask); \ - __hops++) - #endif /* _LINUX_TOPOLOGY_H */ From patchwork Mon Sep 25 02:05:27 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yury Norov X-Patchwork-Id: 144562 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:cae8:0:b0:403:3b70:6f57 with SMTP id r8csp1463428vqu; Mon, 25 Sep 2023 13:25:44 -0700 (PDT) X-Google-Smtp-Source: AGHT+IERsHv4utT/28BIddXN4rf6wCw9/f73f00hxSTC11Cr6jhRnpLYIHEcW3Tu55i7xIcH0dU8 X-Received: by 2002:a17:90a:5806:b0:26b:4ce1:9705 with SMTP id h6-20020a17090a580600b0026b4ce19705mr5402706pji.38.1695673544341; Mon, 25 Sep 2023 13:25:44 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1695673544; cv=none; d=google.com; s=arc-20160816; b=UFtUtiIJPunHoKPs2mPOc+X9WsA2+ix5d62CvaOBb/c2qWcSQRDZTpI11DVaU1dxW8 6oYb++szkoltnjE44pE3a3POxBTfcNtMnZisQ5rgThs3s4miKmZI+A+UpU0I+ErZgQRe K6JtlwRPukNLmqoRC2Vlp/9J2aKO0Kfs0+t71eug/0UVhHnelC3ISMoVCYCDe0J0HlI8 qUmuGrvQ8V/ImOMw4t3KsHXrnPh6suU4VH4G1Ebf12uffsgHCHoQ6vnjNLHaLYJCE1ww OG7PjWLvD5P4btdwGvq7UQZdHO5gsHCWqpqElxVKTCmtc3V4N718WnDEhteKSXorxHIM 2nCw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=tYYVzFPKU+1ehIbHqAxMjCLIu/yAEcO3F57HxWyY/K4=; fh=Vh9RxN0PFG+ubDo7tRHLWjvF26T+zSFG6b8Rw8sy3lQ=; b=zrbdONizYjtYTOfSlmQtE9Pi5dNd+v/K1qyPsi2Kh+i1aWbgtVBtqun/AwcPwlphRT mbYML3PIELVRzNnqDajwxRVG4p0Y68AJ08tuiDui0AZgDgSYPIPwHJ79XJ9dGAlto+Fz /R5oFufBNuaQQmRDjHJL9joC9JDDKsMzTvlG3maE8FTFoXBLdKSIrl3dOHljKgzlJNMt H0LIeMIgxj+VzNuYi3gqjjHn6lmSnE/vr0h45sbqh1TWwe4BT7q1PNahslWnm/E8mUZv cdNgsZ7NMGNDzJsqsc9tjIvgiML9xIAAjKkZENH2Wjhu6HInGbErTb0/lIj0FHIODBFz /86w== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@gmail.com header.s=20230601 header.b="TCjD8OX/"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:2 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: from agentk.vger.email (agentk.vger.email. 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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Daniel Bristot de Oliveira , Pawel Chmielewski , Jacob Keller , Yury Norov Subject: [PATCH 3/4] Revert "sched/topology: Introduce sched_numa_hop_mask()" Date: Sun, 24 Sep 2023 19:05:27 -0700 Message-Id: <20230925020528.777578-4-yury.norov@gmail.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230925020528.777578-1-yury.norov@gmail.com> References: <20230925020528.777578-1-yury.norov@gmail.com> MIME-Version: 1.0 X-Spam-Status: No, score=-0.6 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on agentk.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (agentk.vger.email [0.0.0.0]); Sun, 24 Sep 2023 19:05:55 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1778042582378532728 X-GMAIL-MSGID: 1778042582378532728 This reverts commit 9feae65845f7b16376716fe70b7d4b9bf8721848. Now that for_each_numa_hop_mask() is reverted, revert underlying machinery. Signed-off-by: Yury Norov Signed-off-by: Yury Norov Reviewed-by: Jacob Keller --- include/linux/topology.h | 7 ------- kernel/sched/topology.c | 33 --------------------------------- 2 files changed, 40 deletions(-) diff --git a/include/linux/topology.h b/include/linux/topology.h index 344c2362755a..72f264575698 100644 --- a/include/linux/topology.h +++ b/include/linux/topology.h @@ -247,18 +247,11 @@ static inline const struct cpumask *cpu_cpu_mask(int cpu) #ifdef CONFIG_NUMA int sched_numa_find_nth_cpu(const struct cpumask *cpus, int cpu, int node); -extern const struct cpumask *sched_numa_hop_mask(unsigned int node, unsigned int hops); #else static __always_inline int sched_numa_find_nth_cpu(const struct cpumask *cpus, int cpu, int node) { return cpumask_nth(cpu, cpus); } - -static inline const struct cpumask * -sched_numa_hop_mask(unsigned int node, unsigned int hops) -{ - return ERR_PTR(-EOPNOTSUPP); -} #endif /* CONFIG_NUMA */ #endif /* _LINUX_TOPOLOGY_H */ diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c index 05a5bc678c08..3f1c09a9ef6d 100644 --- a/kernel/sched/topology.c +++ b/kernel/sched/topology.c @@ -2143,39 +2143,6 @@ int sched_numa_find_nth_cpu(const struct cpumask *cpus, int cpu, int node) return ret; } EXPORT_SYMBOL_GPL(sched_numa_find_nth_cpu); - -/** - * sched_numa_hop_mask() - Get the cpumask of CPUs at most @hops hops away from - * @node - * @node: The node to count hops from. - * @hops: Include CPUs up to that many hops away. 0 means local node. - * - * Return: On success, a pointer to a cpumask of CPUs at most @hops away from - * @node, an error value otherwise. - * - * Requires rcu_lock to be held. Returned cpumask is only valid within that - * read-side section, copy it if required beyond that. - * - * Note that not all hops are equal in distance; see sched_init_numa() for how - * distances and masks are handled. - * Also note that this is a reflection of sched_domains_numa_masks, which may change - * during the lifetime of the system (offline nodes are taken out of the masks). - */ -const struct cpumask *sched_numa_hop_mask(unsigned int node, unsigned int hops) -{ - struct cpumask ***masks; - - if (node >= nr_node_ids || hops >= sched_domains_numa_levels) - return ERR_PTR(-EINVAL); - - masks = rcu_dereference(sched_domains_numa_masks); - if (!masks) - return ERR_PTR(-EBUSY); - - return masks[hops][node]; -} -EXPORT_SYMBOL_GPL(sched_numa_hop_mask); - #endif /* CONFIG_NUMA */ static int __sdt_alloc(const struct cpumask *cpu_map) From patchwork Mon Sep 25 02:05:28 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yury Norov X-Patchwork-Id: 144180 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:cae8:0:b0:403:3b70:6f57 with SMTP id r8csp948644vqu; Sun, 24 Sep 2023 20:06:15 -0700 (PDT) X-Google-Smtp-Source: AGHT+IGf/oxUGrlgq6AJE4fMWRBRtuaeRjj36dgR+cn3TyS51xGkFuf9QNogZZYK/i+MK1S40Z16 X-Received: by 2002:a05:6358:249d:b0:143:36f:95ec with SMTP id m29-20020a056358249d00b00143036f95ecmr6833190rwc.14.1695611175463; Sun, 24 Sep 2023 20:06:15 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1695611175; cv=none; d=google.com; s=arc-20160816; b=Z3CSdQdkYvSPLCqyv1YNwIbrQPmBJHLPjgEkTlOvqsZJu6g1Y2ZGUxs2CC/aaYNXxc CK481wjmiTh4Byh4+/7kPyxqlS5kZqjGgmIRLJUHVj3EBcP5153TDgEAv+RWyz+cgVOz goAkHMDp5TSVWyqTxYpKIpsLOpZgXs0fpIjWW7+Z8SlhOCPsK+EEPABEp9ioPZXGv1QL SnD1jHid0t0I6VE9M6WxQZlHKPtq8ES14KXJSqpF69RNOpFpaYjmDsKk2AP0dFnbPl5l wgbUWcM39iu7nmi1i3FKDCNBZninfzOJjIiUbWIfdJm0Ygr0GaQvLOLv28+BJa5mC4QB avhQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=v3Erv5jPUTJ6NOpgZnVC8ZDSsiaEDPSD4W7GSC7tyo4=; fh=Vh9RxN0PFG+ubDo7tRHLWjvF26T+zSFG6b8Rw8sy3lQ=; b=PHhyDPp6c1/3otG5g+uOgKjAoEDi/mnoROHXsuMnRaGbG/hBFY+j7iuYEqds+AYbwx 0y3614ipWSoQujMkegneIEGAV13UhgYyvVxK8tET8acjomeWobBQSEtU8SWh+8nLY4Jo OrMRwCa54j7Q9IgxFGEqR38HBzZx/GMF6/EMcQdlErm/aG3o+fMp/+71w9RJK9zjD/1M uWlQ8zFoiEE6T932DTG9oroydcKRrnEiZOZ//WDfTqc2JPeUmcDgwoUMYpbrxKGsfMks JevrXJRnAy/KJINyE9+iWgPMx4z2LrJlrGj9pyDGZM06fHl0L3upFkEVaexFuzvLF9HI UyXg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@gmail.com header.s=20230601 header.b=Bi1shG2C; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:5 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: from groat.vger.email (groat.vger.email. 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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Daniel Bristot de Oliveira , Pawel Chmielewski , Jacob Keller , Yury Norov Subject: [PATCH 4/4] lib/cpumask: don't mention for_each_numa_hop_mask in cpumask_local_spread()" Date: Sun, 24 Sep 2023 19:05:28 -0700 Message-Id: <20230925020528.777578-5-yury.norov@gmail.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230925020528.777578-1-yury.norov@gmail.com> References: <20230925020528.777578-1-yury.norov@gmail.com> MIME-Version: 1.0 X-Spam-Status: No, score=-0.6 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on groat.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (groat.vger.email [0.0.0.0]); Sun, 24 Sep 2023 19:06:31 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1777977183823701189 X-GMAIL-MSGID: 1777977183823701189 Now that for_each_numa_hop_mask() is reverted, also revert reference to it in the comment to cpumask_local_spread(). This partially reverts commit 2ac4980c57f5 ("lib/cpumask: update comment for cpumask_local_spread()") Signed-off-by: Yury Norov Signed-off-by: Yury Norov Reviewed-by: Jacob Keller --- lib/cpumask.c | 21 --------------------- 1 file changed, 21 deletions(-) diff --git a/lib/cpumask.c b/lib/cpumask.c index a7fd02b5ae26..d341fb71a8a9 100644 --- a/lib/cpumask.c +++ b/lib/cpumask.c @@ -117,27 +117,6 @@ void __init free_bootmem_cpumask_var(cpumask_var_t mask) * * Returns online CPU according to a numa aware policy; local cpus are returned * first, followed by non-local ones, then it wraps around. - * - * For those who wants to enumerate all CPUs based on their NUMA distances, - * i.e. call this function in a loop, like: - * - * for (i = 0; i < num_online_cpus(); i++) { - * cpu = cpumask_local_spread(i, node); - * do_something(cpu); - * } - * - * There's a better alternative based on for_each()-like iterators: - * - * for_each_numa_hop_mask(mask, node) { - * for_each_cpu_andnot(cpu, mask, prev) - * do_something(cpu); - * prev = mask; - * } - * - * It's simpler and more verbose than above. Complexity of iterator-based - * enumeration is O(sched_domains_numa_levels * nr_cpu_ids), while - * cpumask_local_spread() when called for each cpu is - * O(sched_domains_numa_levels * nr_cpu_ids * log(nr_cpu_ids)). */ unsigned int cpumask_local_spread(unsigned int i, int node) {