From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out203-205-221-239.mail.qq.com (out203-205-221-239.mail.qq.com [203.205.221.239]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5C5B2248F4E; Tue, 18 Nov 2025 03:48:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=203.205.221.239 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763437695; cv=none; b=PIYZp48EcRQbOE6777t4f0kBF/+e0Vm7+FmU6h4kucbN//9aJvY/jOgaLqAwLjBCWwdnL3Dd1YhPfUyJx1eCUK8OuJ3zW4Mq7juF+BdsOZp4QoZX+xtOqNOvVcSxHauBe4dX21oOEbpF40VJ82EQIyj2LHv2hPztjAx0P1c9BSg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763437695; c=relaxed/simple; bh=9aRquP0k0CRuXMKjlC/JUHDjx6y/fzBBaTS0hUFw9zo=; h=Message-ID:From:To:Cc:Subject:Date:In-Reply-To:References: MIME-Version; b=jkExL1X0iV0BK7vATpTadcwOVeXUslEQaMcG4cKxvOk+2vpZCLHVZce15tK7vWwgeLODkXZeKxZf5TBk29eyOb1FCaHpAK+Lz1KdZPURsp2nTZigxIzqml+jsxL+Qz9HxweWBGvxB/2go6dzeu7ZetwOF4Hs3wdBBqQ2pplZWyY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=foxmail.com; spf=pass smtp.mailfrom=foxmail.com; dkim=pass (1024-bit key) header.d=foxmail.com header.i=@foxmail.com header.b=A76Ho/Av; arc=none smtp.client-ip=203.205.221.239 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=foxmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=foxmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=foxmail.com header.i=@foxmail.com header.b="A76Ho/Av" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=foxmail.com; s=s201512; t=1763437691; bh=9aRquP0k0CRuXMKjlC/JUHDjx6y/fzBBaTS0hUFw9zo=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=A76Ho/AvuqUMurzKjrXb7KO6fp+MPTsHH9N0meWtZQaAothlKhh3iODPn0ydupTkk qE11LFYKhBS5nHrxtT4O0hcs6aZeiXwMtRDbNm8jWqa8pBTY3vwINH2Ve8t9AJ4n6O b88ZSb8bQeGDTu9W+/o3vMZ6ymHjRzcFX9vvt3kQ= Received: from meizu-Precision-3660.meizu.com ([112.91.84.72]) by newxmesmtplogicsvrsza56-0.qq.com (NewEsmtp) with SMTP id C07A8C22; 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: Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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!