From nobody Wed Dec 17 12:59:25 2025 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 B40BAC07545 for ; Wed, 25 Oct 2023 13:15:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233782AbjJYNPo (ORCPT ); Wed, 25 Oct 2023 09:15:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34524 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232823AbjJYNPj (ORCPT ); Wed, 25 Oct 2023 09:15:39 -0400 Received: from mail-ed1-x52e.google.com (mail-ed1-x52e.google.com [IPv6:2a00:1450:4864:20::52e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4313E116 for ; Wed, 25 Oct 2023 06:15:35 -0700 (PDT) Received: by mail-ed1-x52e.google.com with SMTP id 4fb4d7f45d1cf-51e28cac164so1828365a12.1 for ; Wed, 25 Oct 2023 06:15:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1698239734; x=1698844534; darn=vger.kernel.org; h=cc:to:subject:message-id:date:from:mime-version:from:to:cc:subject :date:message-id:reply-to; bh=9RaUlU1nxCqKDcemUMCbFBahiSg15h6A7+woT7EpFjA=; b=Pk4wQi2bNBBvgB5xf7kgJ70o0nb21GYyN+vsGEREDAz6H8kNp5Yn49oCbDw9vTG79E VEtzBnUHtkbNL/7pkReXB7s2FHJGVR1LVE9ONVXIhc+pxN2C6myyl6prPEF9ysoZLJWh 5LcW5kOu/G9/a4NV67rbGHH7xPGXcmcOO1Nu6ugQ6/Y4rB1Kdu0mJCHf8IVG+snI9ZV+ bPc262iEw2nKHcElMtKSQ3DlDNYeQCKm/e8bE6KasS9jiNWyKHHKN95KLgNmm7+2oMIi 29mSOr0WXZ67YbYxJinDqsYOYt9S4qAJ6CI05nTChYWRHqeEa3ve+Xub2epTlx4rVSzY jaLw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1698239734; x=1698844534; h=cc:to:subject:message-id:date:from:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=9RaUlU1nxCqKDcemUMCbFBahiSg15h6A7+woT7EpFjA=; b=dvN3sjuDZ0uL4bDNeSXUHQLttO7GTO9S6DzfGzD9LFSdiN0QzBRyqG+c2uhTGJYkcn ppZnHGofX+MYvfuyUHLtTJAJq9kZ9MIrfuH4VsuB957ui5YXjID9gE1Kbo8eW+pmqoXf XyjQyOGbY9XlaAgpr7qeDn0hdTw1xuGsFgCe+liwDmkpymuxI63+yZuHurFprgiW9mFR b+KadixuZCEX4CsJWdWdFPsIGpu8hgu4Z1j/4X8vZ9Gyu3H58KcQaj4dmKO3r0Gdyo03 cVFjFd32lPlRVkj5Artat0WwZ2eHSgshFcFDxzfbuAU+PqZT0JPrdhFm7/c8Nu1yyuzX p6hg== X-Gm-Message-State: AOJu0YxjqYM4ruYKmT/NqEiSC++OhRollwsHk48RRZ9SlbSBD0es7FD/ ttVNZTaXOmZkaza4yiZe5aQBEqar+YXoc7+tZHc= X-Google-Smtp-Source: AGHT+IGf0RFhqVSBCtZWMVshUEqDHl2Mhw5MfY0Igi6bPLXi+zIldIN36bhKyeMs64sCzHBPAcBSh0Gu0kSB2/0dvw8= X-Received: by 2002:a17:906:fe06:b0:9a9:f042:deb9 with SMTP id wy6-20020a170906fe0600b009a9f042deb9mr14576255ejb.19.1698239733182; Wed, 25 Oct 2023 06:15:33 -0700 (PDT) MIME-Version: 1.0 From: Liam Ni Date: Wed, 25 Oct 2023 21:15:21 +0800 Message-ID: Subject: [PATCH V7] NUMA: optimize detection of memory with no node id assigned by firmware To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, Mike Rapoport Cc: chenhuacai@kernel.org, kernel@xen0n.name, Dave Hansen , luto@kernel.org, peterz@infradead.org, Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" , Andrew Morton , maobibo@loongson.cn, chenfeiyang@loongson.cn, Zhiguang Ni , zhoubinbin@loongson.cn Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Sanity check that makes sure the nodes cover all memory loops over numa_meminfo to count the pages that have node id assigned by the firmware, then loops again over memblock.memory to find the total amount of memory and in the end checks that the difference between the total memory and memory that covered by nodes is less than some threshold. Worse, the loop over numa_meminfo calls __absent_pages_in_range() that also partially traverses memblock.memory. It's much simpler and more efficient to have a single traversal of memblock.memory that verifies that amount of memory not covered by nodes is less than a threshold. Introduce memblock_validate_numa_coverage() that does exactly that and use it instead of numa_meminfo_cover_memory(). Signed-off-by: Liam Ni --- arch/loongarch/kernel/numa.c | 28 +--------------------------- arch/x86/mm/numa.c | 34 ++-------------------------------- include/linux/memblock.h | 1 + mm/memblock.c | 34 ++++++++++++++++++++++++++++++++++ 4 files changed, 38 insertions(+), 59 deletions(-) diff --git a/arch/loongarch/kernel/numa.c b/arch/loongarch/kernel/numa.c index cb00804826f7..0e69679bfc8d 100644 --- a/arch/loongarch/kernel/numa.c +++ b/arch/loongarch/kernel/numa.c @@ -226,32 +226,6 @@ static void __init node_mem_init(unsigned int node) #ifdef CONFIG_ACPI_NUMA -/* - * Sanity check to catch more bad NUMA configurations (they are amazingly - * common). Make sure the nodes cover all memory. - */ -static bool __init numa_meminfo_cover_memory(const struct numa_meminfo *mi) -{ - int i; - u64 numaram, biosram; - - numaram =3D 0; - for (i =3D 0; i < mi->nr_blks; i++) { - u64 s =3D mi->blk[i].start >> PAGE_SHIFT; - u64 e =3D mi->blk[i].end >> PAGE_SHIFT; - - numaram +=3D e - s; - numaram -=3D __absent_pages_in_range(mi->blk[i].nid, s, e); - if ((s64)numaram < 0) - numaram =3D 0; - } - max_pfn =3D max_low_pfn; - biosram =3D max_pfn - absent_pages_in_range(0, max_pfn); - - BUG_ON((s64)(biosram - numaram) >=3D (1 << (20 - PAGE_SHIFT))); - return true; -} - static void __init add_node_intersection(u32 node, u64 start, u64 size, u32 type) { static unsigned long num_physpages; @@ -396,7 +370,7 @@ int __init init_numa_memory(void) return -EINVAL; init_node_memblock(); - if (numa_meminfo_cover_memory(&numa_meminfo) =3D=3D false) + if (!memblock_validate_numa_coverage(SZ_1M)) return -EINVAL; for_each_node_mask(node, node_possible_map) { diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c index 2aadb2019b4f..4079c9edaa93 100644 --- a/arch/x86/mm/numa.c +++ b/arch/x86/mm/numa.c @@ -447,37 +447,6 @@ int __node_distance(int from, int to) } EXPORT_SYMBOL(__node_distance); -/* - * Sanity check to catch more bad NUMA configurations (they are amazingly - * common). Make sure the nodes cover all memory. - */ -static bool __init numa_meminfo_cover_memory(const struct numa_meminfo *mi) -{ - u64 numaram, e820ram; - int i; - - numaram =3D 0; - for (i =3D 0; i < mi->nr_blks; i++) { - u64 s =3D mi->blk[i].start >> PAGE_SHIFT; - u64 e =3D mi->blk[i].end >> PAGE_SHIFT; - numaram +=3D e - s; - numaram -=3D __absent_pages_in_range(mi->blk[i].nid, s, e); - if ((s64)numaram < 0) - numaram =3D 0; - } - - e820ram =3D max_pfn - absent_pages_in_range(0, max_pfn); - - /* We seem to lose 3 pages somewhere. Allow 1M of slack. */ - if ((s64)(e820ram - numaram) >=3D (1 << (20 - PAGE_SHIFT))) { - printk(KERN_ERR "NUMA: nodes only cover %LuMB of your %LuMB e820 RAM. Not used.\n", - (numaram << PAGE_SHIFT) >> 20, - (e820ram << PAGE_SHIFT) >> 20); - return false; - } - return true; -} - /* * Mark all currently memblock-reserved physical memory (which covers the * kernel's own memory ranges) as hot-unswappable. @@ -583,7 +552,8 @@ static int __init numa_register_memblks(struct numa_meminfo *mi) return -EINVAL; } } - if (!numa_meminfo_cover_memory(mi)) + + if (!memblock_validate_numa_coverage(SZ_1M)) return -EINVAL; /* Finally register nodes. */ diff --git a/include/linux/memblock.h b/include/linux/memblock.h index 1c1072e3ca06..a94efe977539 100644 --- a/include/linux/memblock.h +++ b/include/linux/memblock.h @@ -120,6 +120,7 @@ int memblock_physmem_add(phys_addr_t base, phys_addr_t size); void memblock_trim_memory(phys_addr_t align); bool memblock_overlaps_region(struct memblock_type *type, phys_addr_t base, phys_addr_t size); +bool memblock_validate_numa_coverage(unsigned long threshold_bytes); int memblock_mark_hotplug(phys_addr_t base, phys_addr_t size); int memblock_clear_hotplug(phys_addr_t base, phys_addr_t size); int memblock_mark_mirror(phys_addr_t base, phys_addr_t size); diff --git a/mm/memblock.c b/mm/memblock.c index 0863222af4a4..a1917aa331d6 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -734,6 +734,40 @@ int __init_memblock memblock_add(phys_addr_t base, phys_addr_t size) return memblock_add_range(&memblock.memory, base, size, MAX_NUMNODES, 0= ); } +/** + * memblock_validate_numa_coverage - check if amount of memory with + * no node ID assigned is less than a threshold + * @threshold_bytes: maximal number of bytes that can have unassigned node + * ID (in bytes). + * + * A buggy firmware may report memory that does not belong to any node. + * Check if amount of such memory is below @threshold_pages. + * + * Return: true on success, false on failure. + */ +bool __init_memblock memblock_validate_numa_coverage(unsigned long threshold_bytes) +{ + unsigned long nr_pages =3D 0; + unsigned long start_pfn, end_pfn, mem_size_mb; + int nid, i; + + /* calculate lose page */ + for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid) { + if (nid =3D=3D NUMA_NO_NODE) + nr_pages +=3D end_pfn - start_pfn; + } + + if ((nr_pages << PAGE_SHIFT) >=3D threshold_bytes) { + mem_size_mb =3D memblock_phys_mem_size() >> 20; + pr_err("NUMA: no nodes coverage for %luMB of %luMB RAM\n", + (nr_pages << PAGE_SHIFT) >> 20, mem_size_mb); + return false; + } + + return true; +} + + /** * memblock_isolate_range - isolate given range into disjoint memblocks * @type: memblock type to isolate range for --=20 2.25.1