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[2003:cb:c707:5c00:e650:bcd7:e2a0:54fe]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-36b367e49bdsm19017199f8f.44.2024.08.01.02.14.59 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 01 Aug 2024 02:15:00 -0700 (PDT) Message-ID: <3c79021a-e9a0-4669-a4e7-7060edf12d58@redhat.com> Date: Thu, 1 Aug 2024 11:14:58 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 0/9] mm: swap: mTHP swap allocator base on swap cluster order To: Chris Li , Andrew Morton Cc: Kairui Song , Hugh Dickins , Ryan Roberts , "Huang, Ying" , Kalesh Singh , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Barry Song References: <20240730-swap-allocator-v5-0-cb9c148b9297@kernel.org> 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: <20240730-swap-allocator-v5-0-cb9c148b9297@kernel.org> 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-Stat-Signature: j115hoj77h99b465jneiauhr5bcex9f3 X-Rspam-User: X-Rspamd-Queue-Id: 6458F120006 X-Rspamd-Server: rspam02 X-HE-Tag: 1722503704-454449 X-HE-Meta: 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 ZbwVxzah 3A7O5+IUt1fUzBADObqgQ24CBP3PAqdg4ib7IGFPGUBgaXtVkJXuks+sjXjJE8Cmn5CGRKHFWno9/CYgfmY41WjInjaZD0KeoSU0iw3WJxRKHVkpwDw/dO8Te/JLP7pQw3La5+YHzAvTQd0EUj1Wbl0h+F6i5YW0rLlqZpNCeno4eSOIJGtK+Vjr39jlJdDFjrgCVBwMtyqitoI9yCqJfJ8brRWq4jJcO3eW0n7u0/TrHRjOO8BdgFg5omweK0WcW2YD7K5Yrw2xrI96QwFbjvUVXH1je3MxC9rlKoEbtvAbM84UjdkBQfAMSyKAYKtuI+nybDakeMrmeJgH1Ye1/krTXl8d/1jTmnO/SfHLMDbRjQL/Q1X3x5zNRDQ== 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: List-Subscribe: List-Unsubscribe: On 31.07.24 08:49, Chris Li wrote: > This is the short term solutions "swap cluster order" listed > in my "Swap Abstraction" discussion slice 8 in the recent > LSF/MM conference. > Running the cow.c selftest on mm/mm-unstable, I get: # [RUN] Basic COW after fork() with mprotect() optimization ... with swapped-out, PTE-mapped THP (1024 kB) [ 51.865309] Oops: general protection fault, probably for non-canonical address 0xdead000000000108: 0000 [#1] PREEMPT SMP NOPTI [ 51.867738] CPU: 21 UID: 0 PID: 282 Comm: kworker/21:1 Not tainted 6.11.0-rc1+ #11 [ 51.869566] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-2.fc40 04/01/2014 [ 51.871298] Workqueue: events swap_discard_work [ 51.872211] RIP: 0010:__free_cluster+0x27/0x90 [ 51.873101] Code: 90 90 90 0f 1f 44 00 00 8b 0d 8d 95 96 01 55 48 89 fd 53 48 89 f3 85 c9 75 3a 48 8b 43 50 48 8b 4b 48 48 8d 53 48 48 83 c5 60 <48> 89 41 08 48 89 08 48 8b 45 08 48 89 55 08 48 89 43 50 48 89 6b [ 51.876720] RSP: 0018:ffffa3dcc0aafdc8 EFLAGS: 00010286 [ 51.877752] RAX: dead000000000122 RBX: ffff8e7ed9686e00 RCX: dead000000000100 [ 51.879186] RDX: ffff8e7ed9686e48 RSI: ffff8e7ed9686e18 RDI: ffff8e7ec37831c0 [ 51.880577] RBP: ffff8e7ec5d10860 R08: 0000000000000001 R09: 0000000000000028 [ 51.881972] R10: 0000000000000200 R11: 00000000000004cb R12: ffff8e7ed9686e00 [ 51.883393] R13: 0000000000028200 R14: 0000000000028000 R15: 0000000000000000 [ 51.884827] FS: 0000000000000000(0000) GS:ffff8e822f480000(0000) knlGS:0000000000000000 [ 51.886412] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 51.887532] CR2: 00007f37d7e17840 CR3: 0000000335a3a001 CR4: 0000000000770ef0 [ 51.888931] PKRU: 55555554 [ 51.889471] Call Trace: [ 51.889964] [ 51.890391] ? __die_body.cold+0x19/0x27 [ 51.891174] ? die_addr+0x3c/0x60 [ 51.891824] ? exc_general_protection+0x14f/0x430 [ 51.892754] ? asm_exc_general_protection+0x26/0x30 [ 51.893717] ? __free_cluster+0x27/0x90 [ 51.894483] ? __free_cluster+0x7e/0x90 [ 51.895245] swap_do_scheduled_discard+0x142/0x1b0 [ 51.896189] swap_discard_work+0x26/0x30 [ 51.896958] process_one_work+0x211/0x5a0 [ 51.897750] ? srso_alias_return_thunk+0x5/0xfbef5 [ 51.898693] worker_thread+0x1c9/0x3c0 [ 51.899438] ? __pfx_worker_thread+0x10/0x10 [ 51.900287] kthread+0xe3/0x110 [ 51.900913] ? __pfx_kthread+0x10/0x10 [ 51.901656] ret_from_fork+0x34/0x50 [ 51.902377] ? __pfx_kthread+0x10/0x10 [ 51.903114] ret_from_fork_asm+0x1a/0x30 [ 51.903896] Maybe related to this series? -- Cheers, David / dhildenb