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[2003:cb:c722:3c00:70fc:90a8:2c65:79b4]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4318b5430e2sm146646135e9.8.2024.10.28.10.17.18 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 28 Oct 2024 10:17:19 -0700 (PDT) Message-ID: <70f4f5b1-cee6-49a2-b375-3ef43bf19a0c@redhat.com> Date: Mon, 28 Oct 2024 18:17:17 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC] mm: count zeromap read and set for swapout and swapin To: Nhat Pham , Barry Song <21cnbao@gmail.com> Cc: akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Barry Song , Usama Arif , Chengming Zhou , Yosry Ahmed , Johannes Weiner , Hugh Dickins , Matthew Wilcox , Shakeel Butt , Andi Kleen , Baolin Wang , Chris Li , "Huang, Ying" , Kairui Song , Ryan Roberts References: <20241027011959.9226-1-21cnbao@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: 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-Stat-Signature: pz3io1iiszady9qs68a1e4jy8y15tt7o X-Rspamd-Queue-Id: B83941C0013 X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1730135798-430641 X-HE-Meta: U2FsdGVkX19xsQh2hNJkFJLweWh8KruLXVX9D5SB2zKCAxGDFLr4w0/ZuiuxMVApzlz08BERGf9CLLcJJKkgffQCEh9UldeCUToDdIqu7c1uqsG3ZtlugDbE8pUrQyGrSoOEQY/I0b+vm2hIsyEo4qHYSRLGcpS2YbHOpIb0PrBHYlboT1PdFELeZ6xbYmd/TvH7iQHWuB4GS4Z7CLxMOHtOtUiyU8Ep2lY0LE4p+GpmVxAJ7ZQsebyL59uFaVYk37ecMHGrjZ4Ea4VKTPD6sKgkI7NxFCi0sPKG0Zl8NFPUU4cJDGaFtpzqKOZVk74dGMSuBWB21G1rWAM6O7v6qzgaRsrFNNs3cYpnkC0sGY2PacJiD2ud7LT1fd68T4tDXveryRAhJTyWkWt6V14k04WdJfd2ESi87OaEi8VqR+OS/yzRe+FNatFHEyljTUXK/3QXFW36iXmAHnLu4ckyT5w3utqYHloY0C33vuM+kg1J66ZZe2qqFnyBG3QavnC9B4pbqWye9hZ7HOMOxeNhTWuPM8OgOqsLI7A8VVGG2kWgqS6mK0sVlK7snYLR9+Ibvg5WuuVFeXegs5Xq815YxjgzbhTCK2CPNygj/FArkuPJ+YoJLpNfr1JUvytNSg8lZ81eyPD5U49kkmwrylg6CqceDdkAHNu/1G1i4SnJND4sWzvX6hIjrQTVJ8fGoEv7M6vZST4mt3og/ZIeznQWAcu+a/yXuP6qWBo8xgxiSkDgrjMzYtOR7fpi+4EXTgOEV0IF/cqG9dvU7lW/j3TCFE/6ZWZ6A0xEgF9Ry8Z3SwqT+YlKRj1cYwcI5EnsbxrsuEBD0XK5Kva0Rvg1wgOKvwIkxppvo68cc3tUSK5eah0Mmtew0r5mHmXaReMNYwXA67Yi4M3DVehV1PdXGhu96twxAh6Zou8Q7gMZTQee5rmiqhkkVhiZjAyA7G+cSUjJ4ggWgNv/s0sIdvk7ND5 GQM77hZO cwzz+D6pVgD2N7vGTiv1JSntVZMKYxm7IV0eAzPqCon2BoHsBadGmOCmOw55hc2nbWi2FCuIYJQuXZxGg3KIowv/OiPFbsJ0Wtg43z+WsHRF/3ftK5kBR6pFYnaW0Pd8pD4OvIZB2TD7K3vyYzWHqo4KVM+mHXq541jeOBMf3HT/kj8oZ0hxZgeIaBwcIwUos06A9Lc2XFJC9J37GRIGe8IRj+EtJ7/Ookd386vnFwO673UtFvB9hLXRkCGSREsBFYXG7xmKEkYk9ZVQHm0khPHteiSQVtjHHhq/3YxKbyNlh9J12S7glFQNGQHILEmB4EpdvzZipkNOWhYHFM9NxvenRvyAndKtOzAi1mkL3IXkLR7pIBeUkh4ZXOowyQ4+NWYMeX+r1DEU3EXpWgOmOrRNSOA0mg/Um4oxu4HlA6eCDvyFBCgsvg+jTmvGY5q5B0T6I 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 28.10.24 17:34, Nhat Pham wrote: > On Sun, Oct 27, 2024 at 7:32 PM Barry Song <21cnbao@gmail.com> wrote: >> >> >> agree it is better to have a separate counter for zeromap. >> then it raises a question: what is the proper name for it :-) >> >> zeromap_swpin, zeromap_swpout seems too long? and zswpin >> and zswpout have been used by zswap > > Hmmmmm. How about zeroswpin? zeroswpout? Is this kind of a "swpin_skip" / "swpout_skip" ? Because we optimized it out? -- Cheers, David / dhildenb