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SubjectRe: [RFC PATCH v1 0/6] use mm to manage NVDIMM (pmem) zone
On Mon, May 07, 2018 at 10:50:21PM +0800, Huaisheng Ye wrote:
> Traditionally, NVDIMMs are treated by mm(memory management) subsystem as
> DEVICE zone, which is a virtual zone and both its start and end of pfn
> are equal to 0, mm wouldn’t manage NVDIMM directly as DRAM, kernel uses
> corresponding drivers, which locate at \drivers\nvdimm\ and
> \drivers\acpi\nfit and fs, to realize NVDIMM memory alloc and free with
> memory hot plug implementation.

You probably want to let linux-nvdimm know about this patch set.
Adding to the cc. Also, I only received patch 0 and 4. What happened
to 1-3,5 and 6?

> With current kernel, many mm’s classical features like the buddy
> system, swap mechanism and page cache couldn’t be supported to NVDIMM.
> What we are doing is to expand kernel mm’s capacity to make it to handle
> NVDIMM like DRAM. Furthermore we make mm could treat DRAM and NVDIMM
> separately, that means mm can only put the critical pages to NVDIMM
> zone, here we created a new zone type as NVM zone. That is to say for
> traditional(or normal) pages which would be stored at DRAM scope like
> Normal, DMA32 and DMA zones. But for the critical pages, which we hope
> them could be recovered from power fail or system crash, we make them
> to be persistent by storing them to NVM zone.
>
> We installed two NVDIMMs to Lenovo Thinksystem product as development
> platform, which has 125GB storage capacity respectively. With these
> patches below, mm can create NVM zones for NVDIMMs.
>
> Here is dmesg info,
> Initmem setup node 0 [mem 0x0000000000001000-0x000000237fffffff]
> On node 0 totalpages: 36879666
> DMA zone: 64 pages used for memmap
> DMA zone: 23 pages reserved
> DMA zone: 3999 pages, LIFO batch:0
> mminit::memmap_init Initialising map node 0 zone 0 pfns 1 -> 4096
> DMA32 zone: 10935 pages used for memmap
> DMA32 zone: 699795 pages, LIFO batch:31
> mminit::memmap_init Initialising map node 0 zone 1 pfns 4096 -> 1048576
> Normal zone: 53248 pages used for memmap
> Normal zone: 3407872 pages, LIFO batch:31
> mminit::memmap_init Initialising map node 0 zone 2 pfns 1048576 -> 4456448
> NVM zone: 512000 pages used for memmap
> NVM zone: 32768000 pages, LIFO batch:31
> mminit::memmap_init Initialising map node 0 zone 3 pfns 4456448 -> 37224448
> Initmem setup node 1 [mem 0x0000002380000000-0x00000046bfffffff]
> On node 1 totalpages: 36962304
> Normal zone: 65536 pages used for memmap
> Normal zone: 4194304 pages, LIFO batch:31
> mminit::memmap_init Initialising map node 1 zone 2 pfns 37224448 -> 41418752
> NVM zone: 512000 pages used for memmap
> NVM zone: 32768000 pages, LIFO batch:31
> mminit::memmap_init Initialising map node 1 zone 3 pfns 41418752 -> 74186752
>
> This comes /proc/zoneinfo
> Node 0, zone NVM
> pages free 32768000
> min 15244
> low 48012
> high 80780
> spanned 32768000
> present 32768000
> managed 32768000
> protection: (0, 0, 0, 0, 0, 0)
> nr_free_pages 32768000
> Node 1, zone NVM
> pages free 32768000
> min 15244
> low 48012
> high 80780
> spanned 32768000
> present 32768000
> managed 32768000
>
> Huaisheng Ye (6):
> mm/memblock: Expand definition of flags to support NVDIMM
> mm/page_alloc.c: get pfn range with flags of memblock
> mm, zone_type: create ZONE_NVM and fill into GFP_ZONE_TABLE
> arch/x86/kernel: mark NVDIMM regions from e820_table
> mm: get zone spanned pages separately for DRAM and NVDIMM
> arch/x86/mm: create page table mapping for DRAM and NVDIMM both
>
> arch/x86/include/asm/e820/api.h | 3 +++
> arch/x86/kernel/e820.c | 20 +++++++++++++-
> arch/x86/kernel/setup.c | 8 ++++++
> arch/x86/mm/init_64.c | 16 +++++++++++
> include/linux/gfp.h | 57 ++++++++++++++++++++++++++++++++++++---
> include/linux/memblock.h | 19 +++++++++++++
> include/linux/mm.h | 4 +++
> include/linux/mmzone.h | 3 +++
> mm/Kconfig | 16 +++++++++++
> mm/memblock.c | 46 +++++++++++++++++++++++++++----
> mm/nobootmem.c | 5 ++--
> mm/page_alloc.c | 60 ++++++++++++++++++++++++++++++++++++++++-
> 12 files changed, 245 insertions(+), 12 deletions(-)
>
> --
> 1.8.3.1
>

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