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[2003:cb:c70b:500:6a06:17fc:810b:b054]) by smtp.gmail.com with ESMTPSA id f13-20020a1c6a0d000000b003fe23b10fdfsm3681753wmc.36.2023.10.19.01.07.40 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 19 Oct 2023 01:07:41 -0700 (PDT) Message-ID: Date: Thu, 19 Oct 2023 10:07:39 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 1/2] mm: page_alloc: skip memoryless nodes entirely To: Qi Zheng , akpm@linux-foundation.org, rppt@kernel.org, vbabka@suse.cz, mhocko@suse.com Cc: willy@infradead.org, mgorman@techsingularity.net, mingo@kernel.org, aneesh.kumar@linux.ibm.com, ying.huang@intel.com, hannes@cmpxchg.org, osalvador@suse.de, linux-kernel@vger.kernel.org, linux-mm@kvack.org References: <7928768f2658cd563978f5e5bf8109be1d559320.1697687357.git.zhengqi.arch@bytedance.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZgEEwEIAEICGwMGCwkIBwMCBhUIAgkKCwQW AgMBAh4BAheAAhkBFiEEG9nKrXNcTDpGDfzKTd4Q9wD/g1oFAl8Ox4kFCRKpKXgACgkQTd4Q 9wD/g1oHcA//a6Tj7SBNjFNM1iNhWUo1lxAja0lpSodSnB2g4FCZ4R61SBR4l/psBL73xktp rDHrx4aSpwkRP6Epu6mLvhlfjmkRG4OynJ5HG1gfv7RJJfnUdUM1z5kdS8JBrOhMJS2c/gPf wv1TGRq2XdMPnfY2o0CxRqpcLkx4vBODvJGl2mQyJF/gPepdDfcT8/PY9BJ7FL6Hrq1gnAo4 3Iv9qV0JiT2wmZciNyYQhmA1V6dyTRiQ4YAc31zOo2IM+xisPzeSHgw3ONY/XhYvfZ9r7W1l pNQdc2G+o4Di9NPFHQQhDw3YTRR1opJaTlRDzxYxzU6ZnUUBghxt9cwUWTpfCktkMZiPSDGd KgQBjnweV2jw9UOTxjb4LXqDjmSNkjDdQUOU69jGMUXgihvo4zhYcMX8F5gWdRtMR7DzW/YE BgVcyxNkMIXoY1aYj6npHYiNQesQlqjU6azjbH70/SXKM5tNRplgW8TNprMDuntdvV9wNkFs 9TyM02V5aWxFfI42+aivc4KEw69SE9KXwC7FSf5wXzuTot97N9Phj/Z3+jx443jo2NR34XgF 89cct7wJMjOF7bBefo0fPPZQuIma0Zym71cP61OP/i11ahNye6HGKfxGCOcs5wW9kRQEk8P9 M/k2wt3mt/fCQnuP/mWutNPt95w9wSsUyATLmtNrwccz63XOwU0EVcufkQEQAOfX3n0g0fZz Bgm/S2zF/kxQKCEKP8ID+Vz8sy2GpDvveBq4H2Y34XWsT1zLJdvqPI4af4ZSMxuerWjXbVWb T6d4odQIG0fKx4F8NccDqbgHeZRNajXeeJ3R7gAzvWvQNLz4piHrO/B4tf8svmRBL0ZB5P5A 2uhdwLU3NZuK22zpNn4is87BPWF8HhY0L5fafgDMOqnf4guJVJPYNPhUFzXUbPqOKOkL8ojk CXxkOFHAbjstSK5Ca3fKquY3rdX3DNo+EL7FvAiw1mUtS+5GeYE+RMnDCsVFm/C7kY8c2d0G NWkB9pJM5+mnIoFNxy7YBcldYATVeOHoY4LyaUWNnAvFYWp08dHWfZo9WCiJMuTfgtH9tc75 7QanMVdPt6fDK8UUXIBLQ2TWr/sQKE9xtFuEmoQGlE1l6bGaDnnMLcYu+Asp3kDT0w4zYGsx 5r6XQVRH4+5N6eHZiaeYtFOujp5n+pjBaQK7wUUjDilPQ5QMzIuCL4YjVoylWiBNknvQWBXS lQCWmavOT9sttGQXdPCC5ynI+1ymZC1ORZKANLnRAb0NH/UCzcsstw2TAkFnMEbo9Zu9w7Kv AxBQXWeXhJI9XQssfrf4Gusdqx8nPEpfOqCtbbwJMATbHyqLt7/oz/5deGuwxgb65pWIzufa N7eop7uh+6bezi+rugUI+w6DABEBAAHCwXwEGAEIACYCGwwWIQQb2cqtc1xMOkYN/MpN3hD3 AP+DWgUCXw7HsgUJEqkpoQAKCRBN3hD3AP+DWrrpD/4qS3dyVRxDcDHIlmguXjC1Q5tZTwNB boaBTPHSy/Nksu0eY7x6HfQJ3xajVH32Ms6t1trDQmPx2iP5+7iDsb7OKAb5eOS8h+BEBDeq 3ecsQDv0fFJOA9ag5O3LLNk+3x3q7e0uo06XMaY7UHS341ozXUUI7wC7iKfoUTv03iO9El5f XpNMx/YrIMduZ2+nd9Di7o5+KIwlb2mAB9sTNHdMrXesX8eBL6T9b+MZJk+mZuPxKNVfEQMQ a5SxUEADIPQTPNvBewdeI80yeOCrN+Zzwy/Mrx9EPeu59Y5vSJOx/z6OUImD/GhX7Xvkt3kq Er5KTrJz3++B6SH9pum9PuoE/k+nntJkNMmQpR4MCBaV/J9gIOPGodDKnjdng+mXliF3Ptu6 3oxc2RCyGzTlxyMwuc2U5Q7KtUNTdDe8T0uE+9b8BLMVQDDfJjqY0VVqSUwImzTDLX9S4g/8 kC4HRcclk8hpyhY2jKGluZO0awwTIMgVEzmTyBphDg/Gx7dZU1Xf8HFuE+UZ5UDHDTnwgv7E th6RC9+WrhDNspZ9fJjKWRbveQgUFCpe1sa77LAw+XFrKmBHXp9ZVIe90RMe2tRL06BGiRZr jPrnvUsUUsjRoRNJjKKA/REq+sAnhkNPPZ/NNMjaZ5b8Tovi8C0tmxiCHaQYqj7G2rgnT0kt WNyWQQ== Organization: Red Hat In-Reply-To: <7928768f2658cd563978f5e5bf8109be1d559320.1697687357.git.zhengqi.arch@bytedance.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 8CFC140006 X-Stat-Signature: c443wgsf6scwy73ea6sdpfwfxgk1bkd8 X-HE-Tag: 1697702865-691423 X-HE-Meta: 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 6WnSIqgC 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 19.10.23 09:36, Qi Zheng wrote: > In find_next_best_node(), We skipped the memoryless nodes > when building the zonelists of other normal nodes (N_NORMAL), > but did not skip the memoryless node itself when building > the zonelist. This will cause it to be traversed at runtime. > > For example, say we have node0 and node1, node0 is memoryless > node, then the fallback order of node0 and node1 as follows: > > [ 0.153005] Fallback order for Node 0: 0 1 > [ 0.153564] Fallback order for Node 1: 1 > > After this patch, we skip memoryless node0 entirely, then > the fallback order of node0 and node1 as follows: > > [ 0.155236] Fallback order for Node 0: 1 > [ 0.155806] Fallback order for Node 1: 1 > > So it becomes completely invisible, which will reduce runtime > overhead. > > And in this way, we will not try to allocate pages from memoryless > node0, then the panic mentioned in [1] will also be fixed. Even though > this problem has been solved by dropping the NODE_MIN_SIZE constrain > in x86 [2], it would be better to fix it in core MM as well. > > [1]. https://lore.kernel.org/all/20230212110305.93670-1-zhengqi.arch@bytedance.com/ > [2]. https://lore.kernel.org/all/20231017062215.171670-1-rppt@kernel.org/ > > Signed-off-by: Qi Zheng > --- > mm/page_alloc.c | 7 +++++-- > 1 file changed, 5 insertions(+), 2 deletions(-) > > diff --git a/mm/page_alloc.c b/mm/page_alloc.c > index ee392a324802..e978272699d3 100644 > --- a/mm/page_alloc.c > +++ b/mm/page_alloc.c > @@ -5052,8 +5052,11 @@ int find_next_best_node(int node, nodemask_t *used_node_mask) > int min_val = INT_MAX; > int best_node = NUMA_NO_NODE; > > - /* Use the local node if we haven't already */ > - if (!node_isset(node, *used_node_mask)) { > + /* > + * Use the local node if we haven't already. But for memoryless local > + * node, we should skip it and fallback to other nodes. > + */ > + if (!node_isset(node, *used_node_mask) && node_state(node, N_MEMORY)) { > node_set(node, *used_node_mask); > return node; > } Makes sense to me; I suspect that online_pages() will just to the right thing and call build_all_zonelists() to fix it up. Acked-by: David Hildenbrand -- Cheers, David / dhildenb