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Sat, 22 Nov 2025 05:43:53 -0800 (PST) Received: from google.com ([2a00:79e0:2031:6:948e:149d:963b:f660]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-345b047616bsm5856992a91.9.2025.11.22.05.43.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 22 Nov 2025 05:43:53 -0800 (PST) Date: Sat, 22 Nov 2025 22:43:48 +0900 From: Sergey Senozhatsky To: Gao Xiang Cc: Sergey Senozhatsky , Yuwen Chen , akpm@linux-foundation.org, bgeffon@google.com, licayy@outlook.com, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, minchan@kernel.org, richardycc@google.com Subject: Re: [RFC PATCHv5 0/6] zram: introduce writeback bio batching Message-ID: References: <8c596737-95c1-4274-9834-1fe06558b431@linux.alibaba.com> <853796e3-fd44-4fc2-8fd2-5810342a6ebe@linux.alibaba.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <853796e3-fd44-4fc2-8fd2-5810342a6ebe@linux.alibaba.com> X-Stat-Signature: jkqgtmpjre41omyfstirupu5ktxymuj5 X-Rspam-User: X-Rspamd-Queue-Id: 111B0C000B X-Rspamd-Server: rspam01 X-HE-Tag: 1763819034-935048 X-HE-Meta: U2FsdGVkX1+R6eoA8w+tnFBCVKkcvEuuIZEIE/+Hv80fXp8bQQZ85Y4FQTf124ptV9+lnj6MAfBCP+mwMTF3b9mQ1yExSGPEiTL6ySTjKBKHjcZgKfxEeMZb4Gty1Sb/4/uhc2VtS4fjwEx4xAEkgZIW5xjhrL4B8Ixvf2zVGe5HBnuYFTtFVaNWDUVb41fKG/f0mAMbRrFw41H0KesMcrAIUP8NCBKPzuDQJ6tiSQt3/BhwlwL9ng3kVHforDi0PlIFf180/DKlGtVv/k8EnVbemU3La7CUI8817/1+l+WlDr9YwvZrcZxvRGD8hUG/86Aiz9iqIVtAcQ5dMAKqT4BfYR5Uf98TybkTXLx70HLot6Utxjt2MMH7awOcZfFSRTeTkYpYyfj/sqHn2Q3hDirf9r0GA0cFOtYWmKTOSwTJNyAUHBGzBSg+FM2WGXE+mS3V98Q1PVRIVc7ya0sz6Ks74KDt0UsBr6bkNV+wZothMDaXisFLrK+VQMAWhqNmdlZEJPfvSLaktMcZz7H/LLimUeEUsCNFp+ERyzNvd0wCWHoAqMeiJdEpX2DZDSSycCnOupen4IQSjrX446m1FhZPisTxscWqLOZ4oWhEylPTvewyA/FzVw2bhVJxUOyptuJ3PAjMOKYUlhQY/Kx1+oJ5l9OB3jj+0lCgdCPmdk0Woz8l4AdYAPYSfZ8baCFmqhyv5G+D/8gFSi+qZTMCQktoEvGPlxOsu1RcW77lTPWwQL1XS47sxKlah6qWy0EJ3xrd8rg7/U8gFN8Ts0XYQhqGY6sKnfkn7W8872Dp8Kevg1IkiatX9Iu0W7IcicD0JnsB0sWxP6U34Qsjzh9533AaG2P70WNhQ6BUP6oAzxNVwixiT/h0/Nrh9ygJLG4jn8iU6bZCL2oW//ScEMcSGDOaFBAmoo02dt6eyLmiQ+RjfrtP99Yr0Rd4rIxwSX1giUXpRMoUi9TJHWzR3ag JYSj+MMo FHFjKmPXUudd9m45qMndZ4wNmscebe8Yfyq2RnH5PWpvFx42zYqKefO/RYeiAODZCMDutThAMQRIsLyxaO2hL1E4w4ynT+spHD6sciq9Xvou1OU21Yd8ZPTgfQ8VWlx4/4lBGj6wFyZ5WNJQyoig7wVgIjlsiTousBie/r8FwFlwOZRFvilFjtSWTcOSu6wJit5KfyVICsHPiInJCquMYlHOsrvE9VqG3FxvH3ASSNx505drrGNBT9sz9DHAB1QrQhuRUC5v50d1JobH3TbPDZL1yMZgTOmLBW0rFBtuAsELD6UtuLJO7PN5nk7FbszaVLminMCT0/jxiQOYGMiMpS8j/s9M1MrTZrFlFZChg1OHSIXU= 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 (25/11/22 20:24), Gao Xiang wrote: > zram(ext4) means zram device itself is formated as ext4. > > > > > > zram(ext4) -> backing ext4/btrfs > > > > This is not a valid configuration, as far as I'm concerned. > > Unless I'm missing your point. > > Why it's not valid? zram can be used as a regular virtual > block device, and format with any fs, and mount the zram > then. I thought you were talking about the backing device being ext4/btrfs. Sorry, I don't have enough context/knowledge to understand what you're getting at. zram has been doing writeback for ages, I really don't know what you mean by "to act like this".