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]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 8D998D65529 for ; Wed, 17 Dec 2025 09:46:58 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id C60D36B0005; Wed, 17 Dec 2025 04:46:57 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id C42376B0089; Wed, 17 Dec 2025 04:46:57 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id B410F6B008A; Wed, 17 Dec 2025 04:46:57 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) by kanga.kvack.org (Postfix) with ESMTP id A1C626B0005 for ; Wed, 17 Dec 2025 04:46:57 -0500 (EST) Received: from smtpin25.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay03.hostedemail.com (Postfix) with ESMTP id 5502ABBAE2 for ; Wed, 17 Dec 2025 09:46:57 +0000 (UTC) X-FDA: 84228484074.25.AA67108 Received: from out-178.mta1.migadu.com (out-178.mta1.migadu.com [95.215.58.178]) by imf07.hostedemail.com (Postfix) with ESMTP id 907ED40004 for ; Wed, 17 Dec 2025 09:46:55 +0000 (UTC) Authentication-Results: imf07.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=MRO4qPIx; dmarc=pass (policy=none) header.from=linux.dev; spf=pass (imf07.hostedemail.com: domain of qi.zheng@linux.dev designates 95.215.58.178 as permitted sender) smtp.mailfrom=qi.zheng@linux.dev ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1765964816; a=rsa-sha256; cv=none; b=VLMQ5R2t4RzInuqqoUUbWADnwHaPZx1oqaCZAiSvv3ZPqhTr1ZkY1sZ4yrdJgHye23aJU8 A+znbU03vyXNLMAhQtaN1Lu6PPLxmz9eXuqX1/kq0nzMpnBYRLApI41JdZpZWSwOQvIypW avDUBjvqGTWQFcCNkI6bT7QVuvxr8Rs= ARC-Authentication-Results: i=1; imf07.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=MRO4qPIx; dmarc=pass (policy=none) header.from=linux.dev; spf=pass (imf07.hostedemail.com: domain of qi.zheng@linux.dev designates 95.215.58.178 as permitted sender) smtp.mailfrom=qi.zheng@linux.dev ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1765964815; 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:references:dkim-signature; bh=oN9R7byRGmHEs6T0OtpuwOuRpbJv46Zq9CpZBf5+XJg=; b=sfaFsrYvhHexG0rrFMHhs3JtFtu6iYDB5MRHLbNxTR/G8NT5qN/M/Xk25m2I4HXv5Oh5RE AftvfDCu+J6Gn6dWZcx1LnQiX0RSEp1fWD15oFB+pq/hpYaZcE9TckpM+f/xvzjy9CRz8O TCNHwhJT/pnbhJFL/9IDsWlAB/O1oIw= X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1765964813; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=oN9R7byRGmHEs6T0OtpuwOuRpbJv46Zq9CpZBf5+XJg=; b=MRO4qPIxxsVdDqwXzC7u9PLqRjNXx7wnrDSDf1lYyiYd50PIXjJACLh+SJDhboDde2AFBp xudEn7lhZost3Ms/RAgSJ4rwmF9QHLUnd5iBfmp1YPdZeHPAwkC3Dg4lXkpK8Qt3kXk60G KOm9TW1XYyMer/EiQIPn82zf46FXx9c= From: Qi Zheng To: will@kernel.org, aneesh.kumar@kernel.org, npiggin@gmail.com, peterz@infradead.org, dev.jain@arm.com, akpm@linux-foundation.org, david@kernel.org, ioworker0@gmail.com, linmag7@gmail.com Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-alpha@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linux-um@lists.infradead.org, Qi Zheng Subject: [PATCH v3 0/7] enable PT_RECLAIM on all 64-bit architectures Date: Wed, 17 Dec 2025 17:45:41 +0800 Message-ID: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Rspamd-Queue-Id: 907ED40004 X-Stat-Signature: pxqmwnm1tzfsu4xep3th6txxdpuzkhyh X-Rspam-User: X-Rspamd-Server: rspam06 X-HE-Tag: 1765964815-149236 X-HE-Meta: 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 LGVkA73/ rns8OMGd16TC+Vdy+q4/CW1dudtA7qxJ/eHYCJ/jXPHzmsnhwKjUKjtyb0A5GkflFWIh3x8MfgvTkIjTUKeg5/rpz1lQxDYQm19VsskH/evzisqBdky0waJ4VMxq1rIRLHidwXGcUBP68BScn6mblJ6SHyRpVjlBe8CmlzDelwC9q51qwTaKBrMTA347PUuiqkyv/SfEsXHt2xQkRiV2oJw6iuvfO3GZUQOjdTE6oNJZaGJQ= 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: From: Qi Zheng Changes in v3: - modify the commit message in [PATCH v3 1/7] (suggested by David Hildenbrand) - make PT_RECLAIM depends on MMU_GATHER_RCU_TABLE_FREE instead of 64BIT - collect Acked-by - rebase onto the next-20251217 Changelog in v2: - fix compilation errors (reported by Magnus Lindholm and kernel test robot) - adjust some code style (suggested by Huacai Chen) - make PT_RECLAIM user-unselectable (suggested by David Hildenbrand) - rebase onto the next-20251119 Hi all, This series aims to enable PT_RECLAIM on all 64-bit architectures. On a 64-bit system, madvise(MADV_DONTNEED) may cause a large number of empty PTE page table pages (such as 100GB+). To resolve this problem, we need to enable PT_RECLAIM, which depends on MMU_GATHER_RCU_TABLE_FREE. Therefore, this series first enables MMU_GATHER_RCU_TABLE_FREE on all 64-bit architectures, and finally makes PT_RECLAIM depend on MMU_GATHER_RCU_TABLE_FREE. This way, PT_RECLAIM can be enabled by default on all 64-bit architectures. Of course, this will also be enabled on some 32-bit architectures that already support MMU_GATHER_RCU_TABLE_FREE. That's fine, PT_RECLAIM works well on all 32-bit architectures as well. Although the benefit isn't significant, there's still memory that can be reclaimed. Perhaps PT_RECLAIM can be enabled on all 32-bit architectures in the future. Comments and suggestions are welcome! Thanks, Qi Qi Zheng (7): mm: change mm/pt_reclaim.c to use asm/tlb.h instead of asm-generic/tlb.h alpha: mm: enable MMU_GATHER_RCU_TABLE_FREE LoongArch: mm: enable MMU_GATHER_RCU_TABLE_FREE mips: mm: enable MMU_GATHER_RCU_TABLE_FREE parisc: mm: enable MMU_GATHER_RCU_TABLE_FREE um: mm: enable MMU_GATHER_RCU_TABLE_FREE mm: make PT_RECLAIM depends on MMU_GATHER_RCU_TABLE_FREE arch/alpha/Kconfig | 1 + arch/alpha/include/asm/tlb.h | 6 +++--- arch/loongarch/Kconfig | 1 + arch/loongarch/include/asm/pgalloc.h | 7 +++---- arch/mips/Kconfig | 1 + arch/mips/include/asm/pgalloc.h | 7 +++---- arch/parisc/Kconfig | 1 + arch/parisc/include/asm/tlb.h | 4 ++-- arch/um/Kconfig | 1 + arch/x86/Kconfig | 1 - mm/Kconfig | 9 ++------- mm/pt_reclaim.c | 2 +- 12 files changed, 19 insertions(+), 22 deletions(-) -- 2.20.1