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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 1hQTS3-0004Tr-Ey; Tue, 14 May 2019 09:10:23 +0000 Received: from mx1.redhat.com ([209.132.183.28]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1hQTRz-0004Rb-Sz for linux-arm-kernel@lists.infradead.org; Tue, 14 May 2019 09:10:21 +0000 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 67DCB30230A0; Tue, 14 May 2019 09:10:19 +0000 (UTC) Received: from [10.36.117.118] (ovpn-117-118.ams2.redhat.com [10.36.117.118]) by smtp.corp.redhat.com (Postfix) with ESMTP id 10246608AB; Tue, 14 May 2019 09:10:15 +0000 (UTC) Subject: Re: [PATCH V3 0/4] arm64/mm: Enable memory hot remove To: Anshuman Khandual , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, akpm@linux-foundation.org, catalin.marinas@arm.com, will.deacon@arm.com References: <1557824407-19092-1-git-send-email-anshuman.khandual@arm.com> From: David Hildenbrand Openpgp: preference=signencrypt Autocrypt: addr=david@redhat.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <1557824407-19092-1-git-send-email-anshuman.khandual@arm.com> Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.45]); Tue, 14 May 2019 09:10:19 +0000 (UTC) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190514_021019_975166_B978E04D X-CRM114-Status: GOOD ( 25.72 ) 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, 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 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 On 14.05.19 11:00, Anshuman Khandual wrote: > 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. I should read the cover letter first, so ignore my comments :) > > 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(-) > -- Thanks, David / dhildenb _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel