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[84.136.37.227]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-36638f858fbsm13642539f8f.65.2024.06.25.11.45.26 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 25 Jun 2024 11:45:27 -0700 (PDT) Message-ID: <6a8fa8aa-fb6f-485b-92b6-868a522bd7fc@redhat.com> Date: Tue, 25 Jun 2024 20:45:26 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 3/4] mm/readahead: Limit page cache size in page_cache_ra_order() To: Gavin Shan , linux-mm@kvack.org Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, djwong@kernel.org, willy@infradead.org, akpm@linux-foundation.org, hughd@google.com, torvalds@linux-foundation.org, zhenyzha@redhat.com, shan.gavin@gmail.com References: <20240625090646.1194644-1-gshan@redhat.com> <20240625090646.1194644-4-gshan@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: <20240625090646.1194644-4-gshan@redhat.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-Server: rspam03 X-Rspam-User: X-Rspamd-Queue-Id: 277FC4001C X-Stat-Signature: 4etakrugy99wcezuithbcnwr9ggsk474 X-HE-Tag: 1719341131-924285 X-HE-Meta: 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 qEeUPrWm 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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 25.06.24 11:06, Gavin Shan wrote: > In page_cache_ra_order(), the maximal order of the page cache to be > allocated shouldn't be larger than MAX_PAGECACHE_ORDER. Otherwise, > it's possible the large page cache can't be supported by xarray when > the corresponding xarray entry is split. > > For example, HPAGE_PMD_ORDER is 13 on ARM64 when the base page size > is 64KB. The PMD-sized page cache can't be supported by xarray. > > Suggested-by: David Hildenbrand Heh, you came up with this yourself concurrently :) so feel free to drop that. Acked-by: David Hildenbrand > Signed-off-by: Gavin Shan > --- > mm/readahead.c | 8 ++++---- > 1 file changed, 4 insertions(+), 4 deletions(-) > > diff --git a/mm/readahead.c b/mm/readahead.c > index c1b23989d9ca..817b2a352d78 100644 > --- a/mm/readahead.c > +++ b/mm/readahead.c > @@ -503,11 +503,11 @@ void page_cache_ra_order(struct readahead_control *ractl, > > limit = min(limit, index + ra->size - 1); > > - if (new_order < MAX_PAGECACHE_ORDER) { > + if (new_order < MAX_PAGECACHE_ORDER) > new_order += 2; > - new_order = min_t(unsigned int, MAX_PAGECACHE_ORDER, new_order); > - new_order = min_t(unsigned int, new_order, ilog2(ra->size)); > - } > + > + new_order = min_t(unsigned int, MAX_PAGECACHE_ORDER, new_order); > + new_order = min_t(unsigned int, new_order, ilog2(ra->size)); > > /* See comment in page_cache_ra_unbounded() */ > nofs = memalloc_nofs_save(); -- Cheers, David / dhildenb