From patchwork Mon Mar 3 14:15:34 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ryan Roberts X-Patchwork-Id: 13998903 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 D0FE6C282D2 for ; Mon, 3 Mar 2025 14:16:01 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 3BA806B0085; Mon, 3 Mar 2025 09:16:00 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 345936B008C; Mon, 3 Mar 2025 09:16:00 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 0FCE66B0089; Mon, 3 Mar 2025 09:16:00 -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 D8D786B0083 for ; Mon, 3 Mar 2025 09:15:59 -0500 (EST) Received: from smtpin24.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay08.hostedemail.com (Postfix) with ESMTP id 2CD64140A24 for ; Mon, 3 Mar 2025 14:15:59 +0000 (UTC) X-FDA: 83180438838.24.BC8F151 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf18.hostedemail.com (Postfix) with ESMTP id DF5441C001E for ; Mon, 3 Mar 2025 14:15:55 +0000 (UTC) Authentication-Results: imf18.hostedemail.com; dkim=none; dmarc=pass (policy=none) header.from=arm.com; spf=pass (imf18.hostedemail.com: domain of ryan.roberts@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=ryan.roberts@arm.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1741011356; 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; bh=saGpfAqCtu6kHHdtt7cXnh/fnZ6LEII9AzKkaY+t5eI=; b=QOTKW8AVR26Zc0XXP9KFzoIwOJPMOro1A8wQLJED2suxW7gTuQipF651y5d2aHq6ua53G7 Fd+S/+zi3nS0BUjFQDOEOy0+x2ePIpBN7mPaP3vy8nKOn+qa9ITQ8O4gNHQH0f1SUmW3Pq tFZQYnEd9zJ5xYMGTY3mp8IMPhlj2zg= ARC-Authentication-Results: i=1; imf18.hostedemail.com; dkim=none; dmarc=pass (policy=none) header.from=arm.com; spf=pass (imf18.hostedemail.com: domain of ryan.roberts@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=ryan.roberts@arm.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1741011356; a=rsa-sha256; cv=none; b=LmBpR3cEJBSkKEMiKPwMbgtKZvKVxVSWm4xrGT/y/7yiUPSAkULgIEF2PYyDqACKM/0eKK 7cwZb4JYw2gK6slDlT6DBycX9spar+ec6U+o6Voyx5VM0ThLkpfLvbtOAzyutEzk4QxR6k Zz9yGG04W6owCjHhMonUSbXOZ0ujBRQ= Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 535C3106F; Mon, 3 Mar 2025 06:16:08 -0800 (PST) Received: from e125769.cambridge.arm.com (e125769.cambridge.arm.com [10.1.196.27]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 46EB83F66E; Mon, 3 Mar 2025 06:15:52 -0800 (PST) From: Ryan Roberts To: Andrew Morton , "David S. Miller" , Andreas Larsson , Juergen Gross , Boris Ostrovsky , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , "Matthew Wilcox (Oracle)" , Catalin Marinas Cc: Ryan Roberts , linux-mm@kvack.org, sparclinux@vger.kernel.org, xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 0/5] Fix lazy mmu mode Date: Mon, 3 Mar 2025 14:15:34 +0000 Message-ID: <20250303141542.3371656-1-ryan.roberts@arm.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 X-Stat-Signature: wy3ptfayfi61a6ih4s1saxf6n5irhbhp X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: DF5441C001E X-Rspam-User: X-HE-Tag: 1741011355-774844 X-HE-Meta: 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 UwPrbpJl 6VPp572vxOZOIw6piVkifHdq0B/hm5Qts5SOhZOgZXcwTeMGqkNEtjmRkJoJwCGzp2fwBri1t6mvwV/jVfuDjZcxqbDNSJI0GLiM8 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: Hi All, I'm planning to implement lazy mmu mode for arm64 to optimize vmalloc. As part of that, I will extend lazy mmu mode to cover kernel mappings in vmalloc table walkers. While lazy mmu mode is already used for kernel mappings in a few places, this will extend it's use significantly. Having reviewed the existing lazy mmu implementations in powerpc, sparc and x86, it looks like there are a bunch of bugs, some of which may be more likely to trigger once I extend the use of lazy mmu. So this series attempts to clarify the requirements and fix all the bugs in advance of that series. See patch #1 commit log for all the details. Note that I have only been able to compile test these changes but I think they are in good enough shape for some linux-next testing. Applies on Friday's mm-unstable (5f089a9aa987), as I assume this would be preferred via that tree. Changes since v1 ================ - split v1 patch #1 into v2 patch #1 and #2; per David - Added Acked-by tags from David and Andreas; Thanks! - Refined the patches which are truely fixes and added to stable to cc Thanks, Ryan Ryan Roberts (5): mm: Fix lazy mmu docs and usage fs/proc/task_mmu: Reduce scope of lazy mmu region sparc/mm: Disable preemption in lazy mmu mode sparc/mm: Avoid calling arch_enter/leave_lazy_mmu() in set_ptes Revert "x86/xen: allow nesting of same lazy mode" arch/sparc/include/asm/pgtable_64.h | 2 -- arch/sparc/mm/tlb.c | 5 ++++- arch/x86/include/asm/xen/hypervisor.h | 15 ++------------- arch/x86/xen/enlighten_pv.c | 1 - fs/proc/task_mmu.c | 11 ++++------- include/linux/pgtable.h | 14 ++++++++------ 6 files changed, 18 insertions(+), 30 deletions(-) Acked-by: Juergen Gross --- 2.43.0