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(p200300cbc7302200722983b1524e283a.dip0.t-ipconnect.de. [2003:cb:c730:2200:7229:83b1:524e:283a]) by smtp.gmail.com with ESMTPSA id cl7-20020a5d5f07000000b0033b8881f31dsm762856wrb.68.2024.02.12.05.46.30 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 12 Feb 2024 05:46:31 -0800 (PST) Message-ID: <40889617-0820-473e-86ed-04eca6489169@redhat.com> Date: Mon, 12 Feb 2024 14:46:29 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 23/25] arm64/mm: Implement pte_batch_hint() To: Ryan Roberts , Catalin Marinas , Will Deacon , Ard Biesheuvel , Marc Zyngier , James Morse , Andrey Ryabinin , Andrew Morton , Matthew Wilcox , Mark Rutland , Kefeng Wang , John Hubbard , Zi Yan , Barry Song <21cnbao@gmail.com>, Alistair Popple , Yang Shi , Nicholas Piggin , Christophe Leroy , "Aneesh Kumar K.V" , "Naveen N. Rao" , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" Cc: linux-arm-kernel@lists.infradead.org, x86@kernel.org, linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20240202080756.1453939-1-ryan.roberts@arm.com> <20240202080756.1453939-24-ryan.roberts@arm.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: <20240202080756.1453939-24-ryan.roberts@arm.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-Rspamd-Queue-Id: 1073BC0012 X-Rspam-User: X-Stat-Signature: nehxwhdotm9f3fddmuni1j5ctmpma9dd X-Rspamd-Server: rspam01 X-HE-Tag: 1707745595-791753 X-HE-Meta: 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 ghaEOfhv 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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 02.02.24 09:07, Ryan Roberts wrote: > When core code iterates over a range of ptes and calls ptep_get() for > each of them, if the range happens to cover contpte mappings, the number > of pte reads becomes amplified by a factor of the number of PTEs in a > contpte block. This is because for each call to ptep_get(), the > implementation must read all of the ptes in the contpte block to which > it belongs to gather the access and dirty bits. > > This causes a hotspot for fork(), as well as operations that unmap > memory such as munmap(), exit and madvise(MADV_DONTNEED). Fortunately we > can fix this by implementing pte_batch_hint() which allows their > iterators to skip getting the contpte tail ptes when gathering the batch > of ptes to operate on. This results in the number of PTE reads returning > to 1 per pte. > > Tested-by: John Hubbard > Signed-off-by: Ryan Roberts > --- > arch/arm64/include/asm/pgtable.h | 9 +++++++++ > 1 file changed, 9 insertions(+) > > diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h > index ad04adb7b87f..353ea67b5d75 100644 > --- a/arch/arm64/include/asm/pgtable.h > +++ b/arch/arm64/include/asm/pgtable.h > @@ -1220,6 +1220,15 @@ static inline void contpte_try_unfold(struct mm_struct *mm, unsigned long addr, > __contpte_try_unfold(mm, addr, ptep, pte); > } > > +#define pte_batch_hint pte_batch_hint > +static inline unsigned int pte_batch_hint(pte_t *ptep, pte_t pte) > +{ > + if (!pte_valid_cont(pte)) > + return 1; > + > + return CONT_PTES - (((unsigned long)ptep >> 3) & (CONT_PTES - 1)); > +} > + > /* > * The below functions constitute the public API that arm64 presents to the > * core-mm to manipulate PTE entries within their page tables (or at least this Reviewed-by: David Hildenbrand -- Cheers, David / dhildenb