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[2003:cb:c706:1300:6f08:1748:eba7:b2a9]) by smtp.gmail.com with ESMTPSA id l13-20020a1c790d000000b003f071466229sm15871490wme.17.2023.04.11.01.54.25 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 11 Apr 2023 01:54:26 -0700 (PDT) Message-ID: <5e010945-3603-d0ab-52c1-12cce3c85c3d@redhat.com> Date: Tue, 11 Apr 2023 10:54:25 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.9.1 Subject: Re: [RFC PATCHv2] mm: introduce defer free for cma To: "zhaoyang.huang" , Andrew Morton , Minchan Kim , Joonsoo Kim , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Zhaoyang Huang , ke.wang@unisoc.com References: <1681116395-18633-1-git-send-email-zhaoyang.huang@unisoc.com> From: David Hildenbrand Organization: Red Hat In-Reply-To: <1681116395-18633-1-git-send-email-zhaoyang.huang@unisoc.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-Stat-Signature: 4qftsa7q8trwzqony4eioqqobsc8x4na X-Rspam-User: X-Rspamd-Queue-Id: AA2DB40018 X-Rspamd-Server: rspam06 X-HE-Tag: 1681203272-540124 X-HE-Meta: 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 W0UyJFj4 9HN4eGhqH0fj5rPkRC2o9HxszLOoIdl139TnHBZpNhqu3rUwwlh52mlv7V4skDcDZCsyZBApN579x+5T3klBKDAdPo8/HQ34KCn1txkZIsPqWBbpeT5a1kSBPDIS9QG3Zs7BSDZ/fCjxHmW/le7WnbTR8kRvA5Vx18r2NrmWd+ALSqJz+QUmuM3Uu0/FYxU30pDhqHiBv1AV39yO6KgHugEtPin4gPpp6sjlyLA2BxILOcaJCHekTrlzyK2ZvUpgbC2R6VpudbRujc/cNW404eRnFBDRmWg9evPHlE5xzyawA2Rp0KxM75c21VRAsZmWNG41Mg0juTCOt4Ad/ZOBwbIBJ/4vt25hmHIGCOm5pG/coEgQEFvQiV/T8CBFv64+mofzdczk1UmUn+ACSJ1079flNtEeRj9Qr5TtGFpriVkfJ06HZQYwyccEKm8lQ9rJ2pEpskqF8DwqhWA8= 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: On 10.04.23 10:46, zhaoyang.huang wrote: > From: Zhaoyang Huang > > Continues page blocks are expensive for the system. Introducing defer free > mechanism to buffer some which make the allocation easier. The shrinker will > ensure the page block can be reclaimed when there is memory pressure. This looks unnecessarily complicated without any good motivation and performance numbers why we should even care. -- Thanks, David / dhildenb