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Sat, 22 Nov 2025 16:22:54 -0800 (PST) Received: from google.com ([2a00:79e0:2031:6:296e:57d:751e:5598]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-bd76129de4dsm9097957a12.36.2025.11.22.16.22.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 22 Nov 2025 16:22:53 -0800 (PST) Date: Sun, 23 Nov 2025 09:22:48 +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-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 5C06680005 X-Stat-Signature: crzjkp1xei4it7u3y3t93hdhwjqrw6xu X-Rspam-User: X-HE-Tag: 1763857375-12439 X-HE-Meta: U2FsdGVkX1/qrQwRNdPipkpzgwxYdSR+uRnciOHlIG31EuDNYe/30pTucKThCeA5SksaLVoblO7TnIJ/brSw7ims8ns1frghfkyW3+lZHunMs0mqlUf5O9odxCz8t4tRfRnleJOACdgJXf86RObkiZR3RY2GgYVsUdxxDumfchY3dgVNV2LkQNipmZXe5Xdkwsz8T8X7bTv8A5d6TDFUqNHB2arv8yN3HSQUUWh9r9y/WswjxaR0VqmXfjFApztieKjUUWAhP9ugCmMDLL5iHDx75BN7nYwutha23LbsDwqUlywolIl1IbntxFK5fY2LXmceDC2v9/DKEVT9BDQVynL5rXJnGvRfYrg2LT6Zd++fZ1stfCrTBLz64BNNFvyTxJk6hWLT2R/8BNku7HFpaWCuoIga8349V9f4alKWYJvuc8YniiRqMXKn+b6L7FtymrTr/92C4Qq11DoJUgvlYbTmZv8+jd/vh+zs94I9E6IQLEsFHl8LUuo+YLkWmh9LuLxuQ0dVlgZ4ERsuw3XDeAB6SqqLhaTdzZkIKzB0rZ/PGZovvnbgvUjD8qpZsqLODZ/mtFFKRK4G8WPfXgay58VXfIE/NKABBC/WnTRLAJ/7W/xV08YFW8cCqNm4h1uP3b8y2mY0wALmN6y1kLn6iFulwIkkVVKR5b7NZhiK7HpPVi4+0V5Qs8YDYW4KFFn+G2ES/aXF45ukrTGCZ2x3v/JczD7KDLozyagNKYJmOqNnwN9ut+Ofj6fQ2xeggrC7r093aUigf0RsF2m12hufCQ+8y7rgqVIZNhcb8XVSBtQTc6x80gC7SdqbQGXwnBfJJD/Hyg0i/IeSCAuyhAQfWy0BifnIRzQHPjW20QSy4fi4ll5SdXRsx7/4teFTazDlXkPhi6pTeo6gFSQB/uFHvMPEvYoSPP8wr+QkbAzn5p9V0TGObAbozWJyl/4kZCUeYUn3vb/zeeKWzuOmwUU q6cPri+Y V0Wcp6Px++UsawPjVM6DOEsYNdIQmgPNzGYU0JW2sfF2zJndHXF6V+nj0cohgax8GTBqIQUcJXksmt0R/t98RsG6+QTACaW2JRryiErMdy4R7uP4kyZixaGdKyzUqxpVxeZ9XKbc72XpcW85/SeAKx3k8v1gg77vB8xpvVldV9W9Q1yV8FBznXzO7BDJbyxHB92m010HcpZHjWFzSRCURfjeuaOlAhRLMrKh31GN1Sopq3i5z6n4DliIgiiRnELiPErGE6qrYurEyW4koD/+dRjsfBTrL6HxFJp2p/tH//7AzYKZU0byCgeEZcQyfepVr92nHWcV1Txv76Ygi/Ys1dQOkqUXpYUNYdm1oWqi3tKXxx4k= 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) -> 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. If you want to move data between two filesystems, then just mount both devices and cp/mv data between them. zram is not going to do that for you, zram writeback is for different purpose.