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 X-Spam-Level: X-Spam-Status: No, score=-8.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CE104C04AB4 for ; Tue, 14 May 2019 09:00:20 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 9E48220862 for ; Tue, 14 May 2019 09:00:20 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="oqK60uF6" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9E48220862 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:Message-Id:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To: References:List-Owner; bh=Gic7wQgEjPJDOl/o50DEEuKjlUh5UUBD6L8ih2XXsd8=; b=oqK 60uF6LFw2mXoJt6U1xjzAsCNgFS05eVuI2AdgAcxzoBSYGJERyT7kiWEc1xkNyF6r+86XlXjJsASM JELit2z7xxU2SGW4CYpdmsHddXJvMSjK4TEpkHjpar73ANLX0gKRwCIRNGOPQqGQnYMnRuH/bWHJk Jq8Cj7MUtmUJ75kCIpZ8SmbamItT9egNrtk8u6e83QUgSoHOOy+1gNX9LcdSmYbPHM8xvBqtm/O1A xhcU0YTkw/Pz07Samp/U8gwAYHb/QLjJ00OJQJAZhQ37B/aO6Br4Qt1k4q2TsUb2H13o+tjJjq3qh 5B4Wtb1Fqe3lwGHQ0ebccgbaNr3eo2Q==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hQTIE-0007k8-Be; Tue, 14 May 2019 09:00:14 +0000 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70] helo=foss.arm.com) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hQTIB-0007hf-73 for linux-arm-kernel@lists.infradead.org; Tue, 14 May 2019 09:00:12 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id DDE66374; Tue, 14 May 2019 02:00:07 -0700 (PDT) Received: from p8cg001049571a15.arm.com (unknown [10.163.1.137]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 6C03A3F71E; Tue, 14 May 2019 02:00:00 -0700 (PDT) From: Anshuman Khandual To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, akpm@linux-foundation.org, catalin.marinas@arm.com, will.deacon@arm.com Subject: [PATCH V3 0/4] arm64/mm: Enable memory hot remove Date: Tue, 14 May 2019 14:30:03 +0530 Message-Id: <1557824407-19092-1-git-send-email-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.7.4 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190514_020011_267321_D2D6540A X-CRM114-Status: GOOD ( 14.00 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, mhocko@suse.com, ira.weiny@intel.com, david@redhat.com, robin.murphy@arm.com, cai@lca.pw, logang@deltatee.com, james.morse@arm.com, cpandya@codeaurora.org, arunks@codeaurora.org, dan.j.williams@intel.com, mgorman@techsingularity.net, osalvador@suse.de MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org This series enables memory hot remove on arm64 after fixing a memblock removal ordering problem in generic __remove_memory() and kernel page table race conditions on arm64. This is based on the following arm64 working tree. git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core David had pointed out that the following patch is already in next/master (58b11e136dcc14358) and will conflict with the last patch here. Will fix the conflict once this series gets reviewed and agreed upon. Author: David Hildenbrand Date: Wed Apr 10 11:02:27 2019 +1000 mm/memory_hotplug: make __remove_pages() and arch_remove_memory() never fail All callers of arch_remove_memory() ignore errors. And we should really try to remove any errors from the memory removal path. No more errors are reported from __remove_pages(). BUG() in s390x code in case arch_remove_memory() is triggered. We may implement that properly later. WARN in case powerpc code failed to remove the section mapping, which is better than ignoring the error completely right now. Testing: Tested memory hot remove on arm64 for 4K, 16K, 64K page config options with all possible CONFIG_ARM64_VA_BITS and CONFIG_PGTABLE_LEVELS combinations. But build tested on non arm64 platforms. Changes in V3: - Implemented most of the suggestions from Mark Rutland for remove_pagetable() - Fixed applicable PGTABLE_LEVEL wrappers around pgtable page freeing functions - Replaced 'direct' with 'sparse_vmap' in remove_pagetable() with inverted polarity - Changed pointer names ('p' at end) and removed tmp from iterations - Perform intermediate TLB invalidation while clearing pgtable entries - Dropped flush_tlb_kernel_range() in remove_pagetable() - Added flush_tlb_kernel_range() in remove_pte_table() instead - Renamed page freeing functions for pgtable page and mapped pages - Used page range size instead of order while freeing mapped or pgtable pages - Removed all PageReserved() handling while freeing mapped or pgtable pages - Replaced XXX_index() with XXX_offset() while walking the kernel page table - Used READ_ONCE() while fetching individual pgtable entries - Taken overall init_mm.page_table_lock instead of just while changing an entry - Dropped previously added [pmd|pud]_index() which are not required anymore - Added a new patch to protect kernel page table race condtion for ptdump - Added a new patch from Mark Rutland to prevent huge-vmap with ptdump Changes in V2: (https://lkml.org/lkml/2019/4/14/5) - Added all received review and ack tags - Split the series from ZONE_DEVICE enablement for better review - Moved memblock re-order patch to the front as per Robin Murphy - Updated commit message on memblock re-order patch per Michal Hocko - Dropped [pmd|pud]_large() definitions - Used existing [pmd|pud]_sect() instead of earlier [pmd|pud]_large() - Removed __meminit and __ref tags as per Oscar Salvador - Dropped unnecessary 'ret' init in arch_add_memory() per Robin Murphy - Skipped calling into pgtable_page_dtor() for linear mapping page table pages and updated all relevant functions Changes in V1: (https://lkml.org/lkml/2019/4/3/28) Anshuman Khandual (3): mm/hotplug: Reorder arch_remove_memory() call in __remove_memory() arm64/mm: Hold memory hotplug lock while walking for kernel page table dump arm64/mm: Enable memory hot remove Mark Rutland (1): arm64/mm: Inhibit huge-vmap with ptdump arch/arm64/Kconfig | 3 + arch/arm64/mm/mmu.c | 215 ++++++++++++++++++++++++++++++++++++++++- arch/arm64/mm/ptdump_debugfs.c | 3 + mm/memory_hotplug.c | 3 +- 4 files changed, 217 insertions(+), 7 deletions(-) -- 2.7.4 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel