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Thu, 21 May 2020 20:58:34 -0700 (PDT) From: Jia He Subject: Re: [PATCH V3 0/3] arm64: Enable vmemmap mapping from device memory To: Anshuman Khandual , linux-mm@kvack.org References: <1585631387-18819-1-git-send-email-anshuman.khandual@arm.com> Message-ID: <4853d33f-d524-8209-4f8d-c26ee1eaa85b@gmail.com> Date: Fri, 22 May 2020 11:58:06 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <1585631387-18819-1-git-send-email-anshuman.khandual@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200521_205837_378148_F0A8E075 X-CRM114-Status: GOOD ( 18.36 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Michal Hocko , Thomas Gleixner , David Hildenbrand , Peter Zijlstra , Catalin Marinas , Dave Hansen , Paul Mackerras , linux-ia64@vger.kernel.org, linux-riscv@lists.infradead.org, Will Deacon , jgg@mellanox.com, aneesh.kumar@linux.ibm.com, x86@kernel.org, "Matthew Wilcox \(Oracle\)" , Mike Rapoport , Kaly Xin , Ingo Molnar , Benjamin Herrenschmidt , Fenghua Yu , rcampbell@nvidia.com, Pavel Tatashin , jglisse@redhat.com, Andy Lutomirski , Paul Walmsley , dan.j.williams@intel.com, linux-arm-kernel@lists.infradead.org, Tony Luck , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Palmer Dabbelt , Michael Ellerman , Andrew Morton , robin.murphy@arm.com, "Kirill A. Shutemov" Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi On 2020/3/31 13:09, Anshuman Khandual wrote: > This series enables vmemmap backing memory allocation from device memory > ranges on arm64. But before that, it enables vmemmap_populate_basepages() > and vmemmap_alloc_block_buf() to accommodate struct vmem_altmap based > alocation requests. I verified no obvious regression after this patch series. Host: ThunderX2(armv8a server), kernel v5.4 qemu:v3.1, -M virt \ -object memory-backend-file,id=mem1,share=on,mem-path=/tmp2/nvdimm.img,size=4G,align=2M \ -device nvdimm,id=nvdimm1,memdev=mem1,label-size=2M Guest: kernel v5.7.0-rc5 with this patch series. Tested case: - 4K PAGESIZE, boot, mount w/ -o dax, mount w/o -o dax, basic io - 64K PAGESIZE,boot, mount w/ -o dax, mount w/o -o dax, basic io Not tested: - 16K pagesize due to my hardware limiation(can't run 16K pgsz kernel) - hot-add/remove nvdimm device from qemu due to no fully support on arm64 qemu yet - Host nvdimm device hotplug Hence from above result, Tested-by: Jia He > This series applies after latest (v14) arm64 memory hot remove series > (https://lkml.org/lkml/2020/3/3/1746) on Linux 5.6. > > Pending Question: > > altmap_alloc_block_buf() does not have any other remaining users in the > tree after this change. Should it be converted into a static function and > it's declaration be dropped from the header (include/linux/mm.h). Avoided > doing so because I was not sure if there are any off-tree users or not. > > Changes in V3: > > - Dropped comment from free_hotplug_page_range() per Robin > - Modified comment in unmap_hotplug_range() per Robin > - Enabled altmap support in vmemmap_alloc_block_buf() per Robin > > Changes in V2: (https://lkml.org/lkml/2020/3/4/475) > > - Rebased on latest hot-remove series (v14) adding P4D page table support > > Changes in V1: (https://lkml.org/lkml/2020/1/23/12) > > - Added an WARN_ON() in unmap_hotplug_range() when altmap is > provided without the page table backing memory being freed > > Changes in RFC V2: (https://lkml.org/lkml/2019/10/21/11) > > - Changed the commit message on 1/2 patch per Will > - Changed the commit message on 2/2 patch as well > - Rebased on arm64 memory hot remove series (v10) > > RFC V1: (https://lkml.org/lkml/2019/6/28/32) > > Cc: Catalin Marinas > Cc: Will Deacon > Cc: Mark Rutland > Cc: Paul Walmsley > Cc: Palmer Dabbelt > Cc: Tony Luck > Cc: Fenghua Yu > Cc: Dave Hansen > Cc: Andy Lutomirski > Cc: Peter Zijlstra > Cc: Thomas Gleixner > Cc: Ingo Molnar > Cc: David Hildenbrand > Cc: Mike Rapoport > Cc: Michal Hocko > Cc: "Matthew Wilcox (Oracle)" > Cc: "Kirill A. Shutemov" > Cc: Andrew Morton > Cc: Dan Williams > Cc: Pavel Tatashin > Cc: Benjamin Herrenschmidt > Cc: Paul Mackerras > Cc: Michael Ellerman > Cc:linux-arm-kernel@lists.infradead.org > Cc:linux-ia64@vger.kernel.org > Cc:linux-riscv@lists.infradead.org > Cc:x86@kernel.org > Cc:linuxppc-dev@lists.ozlabs.org > Cc:linux-mm@kvack.org > Cc:linux-kernel@vger.kernel.org > > Anshuman Khandual (3): > mm/sparsemem: Enable vmem_altmap support in vmemmap_populate_basepages() > mm/sparsemem: Enable vmem_altmap support in vmemmap_alloc_block_buf() > arm64/mm: Enable vmem_altmap support for vmemmap mappings > > arch/arm64/mm/mmu.c | 59 ++++++++++++++++++++++++++------------- > arch/ia64/mm/discontig.c | 2 +- > arch/powerpc/mm/init_64.c | 10 +++---- > arch/riscv/mm/init.c | 2 +- > arch/x86/mm/init_64.c | 12 ++++---- > include/linux/mm.h | 8 ++++-- > mm/sparse-vmemmap.c | 38 ++++++++++++++++++++----- > 7 files changed, 87 insertions(+), 44 deletions(-) > -- --- Cheers, Justin (Jia He) _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel