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{ "id": 2175080, "url": "http://patchwork.ozlabs.org/api/1.0/covers/2175080/?format=api", "project": { "id": 60, "url": "http://patchwork.ozlabs.org/api/1.0/projects/60/?format=api", "name": "User-mode Linux Development", "link_name": "linux-um", "list_id": "linux-um.lists.infradead.org", "list_email": "linux-um@lists.infradead.org", "web_url": "", "scm_url": "", "webscm_url": "" }, "msgid": "<cover.1765963770.git.zhengqi.arch@bytedance.com>", "date": "2025-12-17T09:45:41", "name": "[v3,0/7] enable PT_RECLAIM on all 64-bit architectures", "submitter": { "id": 86678, "url": "http://patchwork.ozlabs.org/api/1.0/people/86678/?format=api", "name": "Qi Zheng", "email": "qi.zheng@linux.dev" }, "series": [ { "id": 485652, "url": "http://patchwork.ozlabs.org/api/1.0/series/485652/?format=api", "date": "2025-12-17T09:45:42", "name": "enable PT_RECLAIM on all 64-bit architectures", "version": 3, "mbox": "http://patchwork.ozlabs.org/series/485652/mbox/" } ], "headers": { "Return-Path": "\n <linux-um-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n secure) header.d=lists.infradead.org header.i=@lists.infradead.org\n header.a=rsa-sha256 header.s=bombadil.20210309 header.b=1fg0Po6a;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256\n header.s=key1 header.b=MRO4qPIx;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=none (no SPF record) smtp.mailfrom=lists.infradead.org\n (client-ip=2607:7c80:54:3::133; helo=bombadil.infradead.org;\n envelope-from=linux-um-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org;\n receiver=patchwork.ozlabs.org)" ], "Received": [ "from bombadil.infradead.org (bombadil.infradead.org\n [IPv6:2607:7c80:54:3::133])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4dWTV95ykgz1y0P\n\tfor <incoming@patchwork.ozlabs.org>; Wed, 17 Dec 2025 20:47:13 +1100 (AEDT)", "from localhost ([::1] helo=bombadil.infradead.org)\n\tby bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux))\n\tid 1vVo7k-00000006Sqz-0fWE;\n\tWed, 17 Dec 2025 09:47:12 +0000", "from out-173.mta1.migadu.com ([2001:41d0:203:375::ad])\n\tby bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux))\n\tid 1vVo7f-00000006Snv-3OiD\n\tfor linux-um@lists.infradead.org;\n\tWed, 17 Dec 2025 09:47:10 +0000" ], "DKIM-Signature": [ "v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed;\n\td=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help\n\t:List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding:\n\tMIME-Version:Message-ID:Date:Subject:Cc:To:From:Reply-To:Content-Type:\n\tContent-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender:\n\tResent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner;\n\tbh=oN9R7byRGmHEs6T0OtpuwOuRpbJv46Zq9CpZBf5+XJg=; b=1fg0Po6aFSJzHCMPs0iLD0v5Vs\n\tvtytj91cv/lqRfPyMd7juQrk79Y2M39JaDQBKEqGTD7Nhx/b1+NVY8GtALhtqpwVQbH9WW5ExI71/\n\toR5aIJldzbGeRoEjt6r2+IA5RJMWDatCQtTG6e0CNDEu5I0BoN5B18X4Kv9lgNudKuhIAgmZ/K3oS\n\tP7uxjUncVOW4xgSmAqfaSC4WWwrNhR/s+zS2ehHPrcgjk5Ys1DsI9YGCjuanK5+G63SFqmune6eB8\n\tAkTTivUoL2EewrVvVvR/IJ2wjwBJ8+fcgBTN0dWg3i8MBDXyicJTXrVQeeli/s+Rq46SWDvPzBVzJ\n\tb8VJWpbg==;", "v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1;\n\tt=1765964813;\n\th=from:from:reply-to:subject:subject:date:date:message-id:message-id:\n\t to:to:cc:cc:mime-version:mime-version:\n\t content-transfer-encoding:content-transfer-encoding;\n\tbh=oN9R7byRGmHEs6T0OtpuwOuRpbJv46Zq9CpZBf5+XJg=;\n\tb=MRO4qPIxxsVdDqwXzC7u9PLqRjNXx7wnrDSDf1lYyiYd50PIXjJACLh+SJDhboDde2AFBp\n\txudEn7lhZost3Ms/RAgSJ4rwmF9QHLUnd5iBfmp1YPdZeHPAwkC3Dg4lXkpK8Qt3kXk60G\n\tKOm9TW1XYyMer/EiQIPn82zf46FXx9c=" ], "X-Report-Abuse": "Please report any abuse attempt to abuse@migadu.com and\n include these headers.", "From": "Qi Zheng <qi.zheng@linux.dev>", "To": "will@kernel.org,\n\taneesh.kumar@kernel.org,\n\tnpiggin@gmail.com,\n\tpeterz@infradead.org,\n\tdev.jain@arm.com,\n\takpm@linux-foundation.org,\n\tdavid@kernel.org,\n\tioworker0@gmail.com,\n\tlinmag7@gmail.com", "Cc": "linux-arch@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org,\n\tlinux-mm@kvack.org,\n\tlinux-alpha@vger.kernel.org,\n\tloongarch@lists.linux.dev,\n\tlinux-mips@vger.kernel.org,\n\tlinux-parisc@vger.kernel.org,\n\tlinux-um@lists.infradead.org,\n\tQi Zheng <zhengqi.arch@bytedance.com>", "Subject": "[PATCH v3 0/7] enable PT_RECLAIM on all 64-bit architectures", "Date": "Wed, 17 Dec 2025 17:45:41 +0800", "Message-ID": "<cover.1765963770.git.zhengqi.arch@bytedance.com>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-Migadu-Flow": "FLOW_OUT", "X-CRM114-Version": "20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 ", "X-CRM114-CacheID": "sfid-20251217_014708_002453_6BF5611C ", "X-CRM114-Status": "UNSURE ( 9.80 )", "X-CRM114-Notice": "Please train this message.", "X-Spam-Score": "-2.1 (--)", "X-Spam-Report": "Spam detection software,\n running on the system \"bombadil.infradead.org\",\n has NOT identified this incoming email as spam. The original\n message has been attached to this so you can view it or label\n similar future email. If you have any questions, see\n the administrator of that system for details.\n Content preview: From: Qi Zheng <zhengqi.arch@bytedance.com> Changes in v3:\n - modify the commit message in [PATCH v3 1/7] (suggested by David\n Hildenbrand)\n - make PT_RECLAIM depends on MMU_GATHER_RCU_TABLE_FREE instead of 64BIT -\n collect Acked-by - rebase onto t [...]\n Content analysis details: (-2.1 points, 5.0 required)\n pts rule name description\n ---- ----------------------\n --------------------------------------------------\n -0.0 SPF_PASS SPF: sender matches SPF record\n -0.0 SPF_HELO_PASS SPF: HELO matches SPF record\n -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from\n envelope-from domain\n -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from\n author's\n domain\n -0.1 DKIM_VALID Message has at least one valid DKIM or DK\n signature\n 0.1 DKIM_SIGNED Message has a DKIM or DK signature,\n not necessarily valid\n -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1%\n [score: 0.0000]", "X-BeenThere": "linux-um@lists.infradead.org", "X-Mailman-Version": "2.1.34", "Precedence": "list", "List-Id": "<linux-um.lists.infradead.org>", "List-Unsubscribe": "<http://lists.infradead.org/mailman/options/linux-um>,\n <mailto:linux-um-request@lists.infradead.org?subject=unsubscribe>", "List-Archive": "<http://lists.infradead.org/pipermail/linux-um/>", "List-Post": "<mailto:linux-um@lists.infradead.org>", "List-Help": "<mailto:linux-um-request@lists.infradead.org?subject=help>", "List-Subscribe": "<http://lists.infradead.org/mailman/listinfo/linux-um>,\n <mailto:linux-um-request@lists.infradead.org?subject=subscribe>", "Sender": "\"linux-um\" <linux-um-bounces@lists.infradead.org>", "Errors-To": "linux-um-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org" }, "content": "From: Qi Zheng <zhengqi.arch@bytedance.com>\n\nChanges in v3:\n - modify the commit message in [PATCH v3 1/7] (suggested by David Hildenbrand)\n - make PT_RECLAIM depends on MMU_GATHER_RCU_TABLE_FREE instead of 64BIT\n - collect Acked-by\n - rebase onto the next-20251217\n\nChangelog in v2:\n - fix compilation errors (reported by Magnus Lindholm and kernel test robot)\n - adjust some code style (suggested by Huacai Chen)\n - make PT_RECLAIM user-unselectable (suggested by David Hildenbrand)\n - rebase onto the next-20251119\n\nHi all,\n\nThis series aims to enable PT_RECLAIM on all 64-bit architectures.\n\nOn a 64-bit system, madvise(MADV_DONTNEED) may cause a large number of empty PTE\npage table pages (such as 100GB+). To resolve this problem, we need to enable\nPT_RECLAIM, which depends on MMU_GATHER_RCU_TABLE_FREE.\n\nTherefore, this series first enables MMU_GATHER_RCU_TABLE_FREE on all 64-bit\narchitectures, and finally makes PT_RECLAIM depend on MMU_GATHER_RCU_TABLE_FREE.\nThis way, PT_RECLAIM can be enabled by default on all 64-bit architectures.\n\nOf course, this will also be enabled on some 32-bit architectures that already\nsupport MMU_GATHER_RCU_TABLE_FREE. That's fine, PT_RECLAIM works well on all\n32-bit architectures as well. Although the benefit isn't significant, there's\nstill memory that can be reclaimed. Perhaps PT_RECLAIM can be enabled on all\n32-bit architectures in the future.\n\nComments and suggestions are welcome!\n\nThanks,\nQi\n\nQi Zheng (7):\n mm: change mm/pt_reclaim.c to use asm/tlb.h instead of\n asm-generic/tlb.h\n alpha: mm: enable MMU_GATHER_RCU_TABLE_FREE\n LoongArch: mm: enable MMU_GATHER_RCU_TABLE_FREE\n mips: mm: enable MMU_GATHER_RCU_TABLE_FREE\n parisc: mm: enable MMU_GATHER_RCU_TABLE_FREE\n um: mm: enable MMU_GATHER_RCU_TABLE_FREE\n mm: make PT_RECLAIM depends on MMU_GATHER_RCU_TABLE_FREE\n\n arch/alpha/Kconfig | 1 +\n arch/alpha/include/asm/tlb.h | 6 +++---\n arch/loongarch/Kconfig | 1 +\n arch/loongarch/include/asm/pgalloc.h | 7 +++----\n arch/mips/Kconfig | 1 +\n arch/mips/include/asm/pgalloc.h | 7 +++----\n arch/parisc/Kconfig | 1 +\n arch/parisc/include/asm/tlb.h | 4 ++--\n arch/um/Kconfig | 1 +\n arch/x86/Kconfig | 1 -\n mm/Kconfig | 9 ++-------\n mm/pt_reclaim.c | 2 +-\n 12 files changed, 19 insertions(+), 22 deletions(-)" }