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[2003:cb:c742:a100:9dd2:c523:f5fd:da19]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-42abef81848sm231868465e9.26.2024.08.27.10.35.49 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 27 Aug 2024 10:35:49 -0700 (PDT) Message-ID: <1e95a6e4-9993-40ae-b563-44b7024da25c@redhat.com> Date: Tue, 27 Aug 2024 19:35:48 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] vma remove the unneeded avc bound with non-CoWed folio To: zhiguojiang , Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org, oe-lkp@lists.linux.dev, oliver.sang@intel.com Cc: opensource.kernel@vivo.com References: <20240823140139.263-1-justinjiang@vivo.com> <2f19c2ff-66b2-4860-a870-a1bffe73320c@redhat.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: 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: 8bit X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: ABAE84001C X-Stat-Signature: zizjazzjxbbhe7sbfhqu8nywjiatw37a X-Rspam-User: X-HE-Tag: 1724780154-745848 X-HE-Meta: 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 S5tWsXv+ 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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: List-Subscribe: List-Unsubscribe: On 27.08.24 03:50, zhiguojiang wrote: > > > 在 2024/8/27 1:24, David Hildenbrand 写道: >> On 23.08.24 16:01, Zhiguo Jiang wrote: >>> After CoWed by do_wp_page, the vma established a new mapping >>> relationship >>> with the CoWed folio instead of the non-CoWed folio. However, regarding >>> the situation where vma->anon_vma and the non-CoWed folio's anon_vma are >>> not same, the avc binding relationship between them will no longer be >>> needed, so it is issue for the avc binding relationship still existing >>> between them. >>> >>> This patch will remove the avc binding relationship between vma and the >>> non-CoWed folio's anon_vma, which each has their own independent >>> anon_vma. It can also alleviates rmap overhead simultaneously. >>> >>> Signed-off-by: Zhiguo Jiang >>> --- >>> -v2: >>>   * Solve the kernel test robot noticed "WARNING" >>>     Reported-by: kernel test robot >>>     Closes: >>> https://lore.kernel.org/oe-lkp/202408230938.43f55b4-lkp@intel.com >>>   * Update comments to more accurately describe this patch. >>> >>> -v1: >>> https://lore.kernel.org/linux-mm/20240820143359.199-1-justinjiang@vivo.com/ >>> >>>   include/linux/rmap.h |  1 + >>>   mm/memory.c          |  8 +++++++ >>>   mm/rmap.c            | 53 ++++++++++++++++++++++++++++++++++++++++++++ >>>   3 files changed, 62 insertions(+) >>> >>> diff --git a/include/linux/rmap.h b/include/linux/rmap.h >>> index 91b5935e8485..8607d28a3146 >>> --- a/include/linux/rmap.h >>> +++ b/include/linux/rmap.h >>> @@ -257,6 +257,7 @@ void folio_remove_rmap_ptes(struct folio *, >>> struct page *, int nr_pages, >>>       folio_remove_rmap_ptes(folio, page, 1, vma) >>>   void folio_remove_rmap_pmd(struct folio *, struct page *, >>>           struct vm_area_struct *); >>> +void folio_remove_anon_avc(struct folio *, struct vm_area_struct *); >>>     void hugetlb_add_anon_rmap(struct folio *, struct vm_area_struct *, >>>           unsigned long address, rmap_t flags); >>> diff --git a/mm/memory.c b/mm/memory.c >>> index 93c0c25433d0..4c89cb1cb73e >>> --- a/mm/memory.c >>> +++ b/mm/memory.c >>> @@ -3428,6 +3428,14 @@ static vm_fault_t wp_page_copy(struct vm_fault >>> *vmf) >>>                * old page will be flushed before it can be reused. >>>                */ >>>               folio_remove_rmap_pte(old_folio, vmf->page, vma); >>> + >>> +            /* >>> +             * If the new_folio's anon_vma is different from the >>> +             * old_folio's anon_vma, the avc binding relationship >>> +             * between vma and the old_folio's anon_vma is removed, >>> +             * avoiding rmap redundant overhead. >>> +             */ >>> +            folio_remove_anon_avc(old_folio, vma); >> >> ... by increasing write fault latency, introducing an RMAP walk (!)? Hmm? >> >> On the reuse path, we do a folio_move_anon_rmap(), to optimize that. >> > Thanks for your comments. This may not be a good fixup patch. The > resue patch folio_move_anon_rmap() seems to be exclusive or > _refcount = 1 folios. The fork() path seems to clear exclusive flag > in copy_page_range() --> ... --> __folio_try_dup_anon_rmap(). However, > I observed lots of orphan avcs by the above debug trace logs in > wp_page_copy(). But they may be not removed by discussing with Mika. Was this patch ever tested? I cannot even boot a simple VM without an endless stream of [ 5.804598] ------------[ cut here ]------------ [ 5.805494] WARNING: CPU: 11 PID: 595 at mm/rmap.c:443 unlink_anon_vmas+0x19b/0x1d0 [ 5.806962] Modules linked in: qemu_fw_cfg [ 5.807762] CPU: 11 UID: 0 PID: 595 Comm: dracut-rootfs-g Tainted: G W 6.11.0-rc4+ #72 [ 5.809546] Tainted: [W]=WARN [ 5.810127] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-2.fc40 04/01/2014 [ 5.811753] RIP: 0010:unlink_anon_vmas+0x19b/0x1d0 [ 5.812680] Code: b0 00 00 00 00 75 1f f0 ff 8f a0 00 00 00 75 a2 e8 8a fd ff ff eb 9b 5b 5d 41 5c 41 5d 41 5e 41 5f e9 d4 82 d0 00 0f 0b eb dd <0f> 0b eb cf 0f 0b 48 83 c7 08 e8 16 40 d7 ff e9 ea fe ff ff 48 8b [ 5.816247] RSP: 0018:ffffa19f43bb78d0 EFLAGS: 00010286 [ 5.817258] RAX: ffff8a71c1bdd2d0 RBX: ffff8a71c1bdd2c0 RCX: ffff8a71c27a86c8 [ 5.818624] RDX: 0000000000000001 RSI: ffff8a71c2771b28 RDI: ffff8a71c27a9e60 [ 5.820011] RBP: dead000000000122 R08: 0000000000000000 R09: 0000000000000001 [ 5.821380] R10: 0000000000000200 R11: 0000000000000001 R12: ffff8a71c2771b28 [ 5.822748] R13: dead000000000100 R14: ffff8a71c2771b18 R15: ffff8a71c27a9e60 [ 5.824122] FS: 0000000000000000(0000) GS:ffff8a7337980000(0000) knlGS:0000000000000000 [ 5.825665] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 5.826775] CR2: 00007fca7f70ac58 CR3: 00000001027b2004 CR4: 0000000000770ef0 [ 5.828146] PKRU: 55555554 [ 5.828686] Call Trace: [ 5.829169] [ 5.829594] ? __warn.cold+0xb1/0x13e [ 5.830312] ? unlink_anon_vmas+0x19b/0x1d0 [ 5.831118] ? report_bug+0xff/0x140 [ 5.831840] ? handle_bug+0x3c/0x80 [ 5.832524] ? exc_invalid_op+0x17/0x70 [ 5.833262] ? asm_exc_invalid_op+0x1a/0x20 [ 5.834086] ? unlink_anon_vmas+0x19b/0x1d0 [ 5.834908] free_pgtables+0x130/0x290 [ 5.835661] exit_mmap+0x19a/0x460 [ 5.836351] __mmput+0x4b/0x120 [ 5.836965] do_exit+0x2e1/0xac0 [ 5.837601] ? lock_release+0xd5/0x2c0 [ 5.838343] do_group_exit+0x36/0xa0 [ 5.839035] __x64_sys_exit_group+0x18/0x20 [ 5.839866] x64_sys_call+0x14b4/0x14c0 Andrew, please remove this from mm-unstable. -- Cheers, David / dhildenb