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[2003:cb:c705:1400:78ba:c2d2:22a1:8858]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-422f641a6c1sm184681675e9.40.2024.06.18.02.57.20 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 18 Jun 2024 02:57:20 -0700 (PDT) Message-ID: <75ee1ec6-12b0-461e-9dab-6fb6d5cc235f@redhat.com> Date: Tue, 18 Jun 2024 11:57:19 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] s390/mm: get total ram pages from memblock To: Wei Yang , agordeev@linux.ibm.com, gerald.schaefer@linux.ibm.com, hca@linux.ibm.com, gor@linux.ibm.com, borntraeger@linux.ibm.com, svens@linux.ibm.com Cc: linux-s390@vger.kernel.org, linux-mm@kvack.org, Mike Rapoport References: <20240616013537.20338-1-richard.weiyang@gmail.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: <20240616013537.20338-1-richard.weiyang@gmail.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: rspam01 X-Rspamd-Queue-Id: CDEDD18000E X-Stat-Signature: j811no8mihufe7co57khy8iwzweun9hn X-HE-Tag: 1718704645-575526 X-HE-Meta: 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 U/kUaNLJ 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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 16.06.24 03:35, Wei Yang wrote: > On s390, zero page's size relies on total ram pages. > > Since we plan to move the accounting into __free_pages_core(), > totalram_pages may not represent the total usable pages on system > at this point when defer_init is enabled. > > We can get the total usable pages from memblock directly. The size maybe > not accurate due to the alignment, but enough for the calculation. > > Signed-off-by: Wei Yang > CC: Mike Rapoport (IBM) > CC: David Hildenbrand > > --- > Not tested on a machine, hope it is fine. > --- > arch/s390/mm/init.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c > index e769d2726f4e..d811ffa5e147 100644 > --- a/arch/s390/mm/init.c > +++ b/arch/s390/mm/init.c > @@ -65,12 +65,13 @@ static void __init setup_zero_pages(void) > unsigned int order; > struct page *page; > int i; > + unsigned long total_pages = PHYS_PFN(memblock_phys_mem_size() - memblock_reserved_size()); > > /* Latest machines require a mapping granularity of 512KB */ > order = 7; > > /* Limit number of empty zero pages for small memory sizes */ > - while (order > 2 && (totalram_pages() >> 10) < (1UL << order)) > + while (order > 2 && (total_pages >> 10) < (1UL << order)) > order--; > > empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order); I suspect that this is good enough as an approximation for that purpose. Reviewed-by: David Hildenbrand -- Cheers, David / dhildenb