From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id B2FE8C7EE2F for ; Sun, 26 Feb 2023 04:13:18 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 3AC8A6B0073; Sat, 25 Feb 2023 23:13:18 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 30E156B0074; Sat, 25 Feb 2023 23:13:18 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 19B176B0075; Sat, 25 Feb 2023 23:13:18 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id 0C3B86B0073 for ; Sat, 25 Feb 2023 23:13:18 -0500 (EST) Received: from smtpin28.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay04.hostedemail.com (Postfix) with ESMTP id DB3F01A0123 for ; Sun, 26 Feb 2023 04:13:17 +0000 (UTC) X-FDA: 80508123234.28.265BD7D Received: from mail3-166.sinamail.sina.com.cn (mail3-166.sinamail.sina.com.cn [202.108.3.166]) by imf10.hostedemail.com (Postfix) with ESMTP id 75226C0004 for ; Sun, 26 Feb 2023 04:13:14 +0000 (UTC) Authentication-Results: imf10.hostedemail.com; dkim=none; dmarc=none; spf=pass (imf10.hostedemail.com: domain of hdanton@sina.com designates 202.108.3.166 as permitted sender) smtp.mailfrom=hdanton@sina.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1677384796; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=tWihYhK7wvKVepyllvrqioWZmsEvKBOjV3PJbqpwwAw=; b=CA2k8LXttgHgVTYytcMRcRKkgV94OuxQiE91MbW90zW1MxKJlxu6t5sCN8fRUh+EDLpouj 6v2qBdchofWEeqp+RWaOREK9KpuzJraamZWBAW5kssuI3x51+VkBT2o/9BktWq9wHDRCUe QwC6XcQsCG2J4xeDQUvjItThKW6HPdI= ARC-Authentication-Results: i=1; imf10.hostedemail.com; dkim=none; dmarc=none; spf=pass (imf10.hostedemail.com: domain of hdanton@sina.com designates 202.108.3.166 as permitted sender) smtp.mailfrom=hdanton@sina.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1677384796; a=rsa-sha256; cv=none; b=p2pGV8livTHmhKLsR7OYDML9NWLCdXcP2vUuKbe1JHCFJ2A81WmJbg1CghprQT9W8GI5ST nrnJ81XFm6/BhrbPUCQ2hQLkNHTILDlL9X8HvjPEC0lr7mD3Uyub0HMycPds/IMNHBR0uS bM+evnlEvlCZDBAsbY2bEi2rECBV+ZA= Received: from unknown (HELO localhost.localdomain)([114.249.61.130]) by sina.com (172.16.97.23) with ESMTP id 63FADC4C000156A1; Sun, 26 Feb 2023 12:13:01 +0800 (CST) X-Sender: hdanton@sina.com X-Auth-ID: hdanton@sina.com X-SMAIL-MID: 80838954921528 From: Hillf Danton To: Matthew Wilcox Cc: Yu Zhao , lsf-pc@lists.linux-foundation.org, Linux-MM , Yang Shi , "Yin, Fengwei" , Hugh Dickins , "Kirill A . Shutemov" Subject: Re: [LSF/MM/BPF TOPIC] Flexible orders for anonymous folios Date: Sun, 26 Feb 2023 12:12:59 +0800 Message-Id: <20230226041259.3414-1-hdanton@sina.com> In-Reply-To: References: <20230226013031.3356-1-hdanton@sina.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 75226C0004 X-Stat-Signature: trjidh5kcpxud6gdrc38eih9t7h4t5xs X-Rspam-User: X-HE-Tag: 1677384794-511422 X-HE-Meta: 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 xsj2uDl8 nD2PBuZp6gNuXS/v2aZc9Xok90OgrbNPiqaOXNusn/pIdQO9nQvWsJUgBjJyhbzIFX9kfz+2voWgYk6kk8/FfmULmm668X1hoTiPj3avJBPvuhj72moCyHSIjnPEvzk55RfVSEPhomm37ToPYUW174UAAOHfS/o9H/IMwVol95Uyq7qVaCuQkvvx0DQYSsi41NGK6IKujMQgWzxp3y2cJXQsWpw== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000473, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Sun, 26 Feb 2023 02:34:05 +0000 Matthew Wilcox > On Sun, Feb 26, 2023 at 09:30:31AM +0800, Hillf Danton wrote: > > On Wed, Feb 22, 2023 at 04:55:20PM -0700, Yu Zhao wrote: > > > Currently anonymous folios only support two orders: 0 and the PMD > > > order. Flexible orders for anonymous folios can resist both internal > > > or external fragmentations when the PMD order is too underutilized or > > > costly to allocate. Flexible orders can also leverage the TLB > > > coalescing feature, .e.g., order 3 for AMD and order 4 for ARM CPUs. > > > > > > Discussion points: > > > 1. The page fault path: determining the best order and the fallback policy. > > > 2. The reclaim path: detecting the utilization and the splitting policy. > > > 3. The refcount and the mapcount models, e.g., reuse the PMD-mapped > > > THP model or not. > > > 4. The splitting, and the collapsing if needed. > > > 5. Other paths: COW, GUP, madvise(), mprotect(), page migration, etc. > > > > 6. Given the number of TLB is farrr less than the number of pages, > > what workload prefers MADV_ORDER6 over MADV_HUGEPAGE for instance? > > Many. https://lore.kernel.org/linux-mm/Y%2FWRlX+MkmxelNbg@casper.infradead.org/ Which one, supposedly given Apache Spark, MariaDB, Memcached, MongoDB, Apache Cassandra, Apache Hadoop, PostgreSQL and Redis to ease the anwser?