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=-3.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, T_DKIMWL_WL_HIGH,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 EFFDFC28CC0 for ; Wed, 29 May 2019 09:16:36 +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 C6F3820665 for ; Wed, 29 May 2019 09:16:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="ANVjkbzW" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C6F3820665 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=/IMI/2N2jt/dY3Ey/e10D1RkcnxV5fNEJismnJ+4wY4=; b=ANV jkbzWMgmjUTbcxVoj/r8B5U7dV3HgFL/CX4cKF3k1Gmfg1wLMCjnxncyF9jof+m6Hou/TTgiLYV0y HTwewyaTkat8xo92ZzaNpu/tRdRmTrS2j31gNr1SR9zUWon+kNmpOVi225ZTZhUVtKayqP3FK+1yw 1/HQ6hlswgx8lCFWuZVu1G1c/A1hEuKYH0v24lC9oPhITXWWT5VsJocaHhpXv1+kdmhhLc4UCit5T vtjRunHLh6EAHqQ+NkzMnXTUkoolKlDM0TZYgkZB0rqHJGJMikCJAJM15/bbaar4YariUuA+WD7Wu qtMId7XJaQ0GbEt1Ru1sBCF9vv4Hppg==; 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 1hVuhB-0007hg-1E; Wed, 29 May 2019 09:16:29 +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 1hVuh7-0007gt-1W for linux-arm-kernel@lists.infradead.org; Wed, 29 May 2019 09:16:26 +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 F2311341; Wed, 29 May 2019 02:16:22 -0700 (PDT) Received: from p8cg001049571a15.blr.arm.com (p8cg001049571a15.blr.arm.com [10.162.41.181]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id B1B0E3F5AF; Wed, 29 May 2019 02:16:17 -0700 (PDT) From: Anshuman Khandual To: linux-mm@kvack.org, 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 V5 0/3] arm64/mm: Enable memory hot remove Date: Wed, 29 May 2019 14:46:24 +0530 Message-Id: <1559121387-674-1-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-20190529_021625_111559_28149B0A X-CRM114-Status: GOOD ( 13.71 ) 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, david@redhat.com, ira.weiny@intel.com, mgorman@techsingularity.net, cai@lca.pw, ard.biesheuvel@arm.com, cpandya@codeaurora.org, james.morse@arm.com, dan.j.williams@intel.com, logang@deltatee.com, arunks@codeaurora.org, 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 one possible arm64 platform specific kernel page table race condition. This series is based on latest v5.2-rc2 tag. Testing: Memory hot remove has been tested on arm64 for 4K, 16K, 64K page config options with all possible CONFIG_ARM64_VA_BITS and CONFIG_PGTABLE_LEVELS combinations. Its only build tested on non-arm64 platforms. Changes in V5: - Have some agreement [1] over using memory_hotplug_lock for arm64 ptdump - Change 7ba36eccb3f8 ("arm64/mm: Inhibit huge-vmap with ptdump") already merged - Dropped the above patch from this series - Fixed indentation problem in arch_[add|remove]_memory() as per David - Collected all new Acked-by tags Changes in V4: (https://lkml.org/lkml/2019/5/20/19) - Implemented most of the suggestions from Mark Rutland - Interchanged patch [PATCH 2/4] <---> [PATCH 3/4] and updated commit message - Moved CONFIG_PGTABLE_LEVELS inside free_[pud|pmd]_table() - Used READ_ONCE() in missing instances while accessing page table entries - s/p???_present()/p???_none() for checking valid kernel page table entries - WARN_ON() when an entry is !p???_none() and !p???_present() at the same time - Updated memory hot-remove commit message with additional details as suggested - Rebased the series on 5.2-rc1 with hotplug changes from David and Michal Hocko - Collected all new Acked-by tags Changes in V3: (https://lkml.org/lkml/2019/5/14/197) - 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 condition 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) [1] https://lkml.org/lkml/2019/5/28/584 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 arch/arm64/Kconfig | 3 + arch/arm64/mm/mmu.c | 211 ++++++++++++++++++++++++++++++++++++++++- arch/arm64/mm/ptdump_debugfs.c | 3 + mm/memory_hotplug.c | 2 +- 4 files changed, 216 insertions(+), 3 deletions(-) -- 2.7.4 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel