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Tue, 18 Nov 2025 11:48:07 +0800 X-QQ-mid: xmsmtpt1763437687tw5mmd9sa Message-ID: X-QQ-XMAILINFO: MZtEYADUG4Ag7myerlRVic0qoCY5DlUrDcjqxj2ytor3y1jT975wl9ilILPS7d mAAByoXzaYGiVr/mjqgPuKntmIzMBp5xrlFTKgCQVMb7s7RtU8MlS3QdVSzwaRqghmi2k0IqyKEx EbObugFHd84YXzikQxBmsq7SeXUf2kg3iNSJEH4enrQEmDMDsGgqPZT3SyGFWFgxuiEDYkJHoJJt 2I9WW77thHAPls+llTWYu8ZOwES+hVjhdniMYITEcSqpVh3ePLcF58bN4vETagcaAmZQ4+mt3gYp pdat+MjK5ORcsUFzhiRnoOXQ1vmLUXmUdkXQxrK2l6tgWq3SssV/PdFygne/25tK81vVmRG8WxT0 XTbRqDH7bhrUqFEoc5MN5Lk0I1YxbGzFy3gUXCeiijzgpSIQYfQYUi3puW3hzkvFKWXwUGVdxEbV 3KlIaNLz+laETZfO1JGJ/KZuWGaOYV8KAQgkLzuTZq/nKLbrNVj1V05zxgtTD4d1SQXhn1Ih8J3U bIVB1hArlG0D1TSMWzkbLolS3sKVuH0JS6AdPkde5XCEjvpP6R9wuircNu385+8OHJ9BRrA7tBQH Hi1JSIyI8gpgI2hY5iub4A8zjXj26LZnJAnZWGPZIoeR/9T5wl1IwU1XjrDkfHiE0Q0VhCFzXM4o d6tjXuxe1WIZxZ1yj0UzL51kFt03sy8SPyZfqpgzwYB7rcyq8i2wzJc658JmtMy+6SULLChE09j1 PGCreKBUTQJ5RZbyS5ykAp8X+GRlUu44dSSyl057fMbgCGY906xb5gFA6nPY3Pb6t6hZdIB42bVo 2+oo0VxpfKCTJ8LBpgDMKuft0lSTAaebtJjzWL7KbNeEns0NJ/aGH3JIjZei6EE+c7+Hc3fpRuSN NUMIwDVSCuwHVVv30Ew26G+lFYmVzdQyNSL6B/lb+HQEDALYFD7uar87GSE6Jqx7/ZGu5QjKYMVj IMtJMhPykSCfgH9XeW01JYT/D/ySE1n/0NQYe+abhXV0pxyhdPsCDCFhe8ZAX5QpRHnjWIntbmXs nIwvsd2Oc8ohRYAKhXzxpL3gE3/41+kmFAIx2XaTFe1HdY1yDutAXhQwIz+q9/8vnhKri/xjt74C dd050/ X-QQ-XMRINFO: M/715EihBoGSf6IYSX1iLFg= From: Yuwen Chen To: bgeffon@google.com Cc: akpm@linux-foundation.org, licayy@outlook.com, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, minchan@google.com, minchan@kernel.org, richardycc@google.com, senozhatsky@chromium.org, ywen.chen@foxmail.com Subject: Re: [PATCHv3 1/4] zram: introduce writeback bio batching support Date: Tue, 18 Nov 2025 11:48:07 +0800 X-OQ-MSGID: <20251118034807.2801578-1-ywen.chen@foxmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 41822180008 X-Stat-Signature: cabewea7x7urnacc4ohq4rj6ijz838tt X-Rspam-User: X-HE-Tag: 1763437696-460342 X-HE-Meta: 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 SvvcqBGB p6qufrUtCLSwHbPSGKgsKvJdobwEJt15RVTVWaa3uEayUa6NwAsBmuCX8QbSNicBPTGk/1XlLaVoNXFV9NxhtRAdtKEKnnAoQAnPQCfjtJxXZrmR4NoKZxCBgbrNKDtjHgXk514vyYnQuDu0NVPtYE46avA0edqHVSNKPE7VI/eUhQrgRn8zp8Iq019YM+00UAtEhYiRVOFHfm0rkTROadWgGvw== 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 Mon, 17 Nov 2025 10:19:22 -0500, Brian Geffon wrote: > Out of curiosity, why are we doing 1 page per bio? Why are we not > adding BIO_MAX_VECS before submitting? And then, why are we not > chaining? Do the block layer maintainers have thoughts? Mainly because the zram backend device is quite special. When performing the writeback operation, the probability of continuous writing is relatively low. If BIO_MAX_VECS is used, it will make the logic extremely complex. Thank you very much!