Re: [PATCH 0/3] 1G transparent hugepage support for device dax

On Mon 23-01-17 16:47:18, Dave Jiang wrote:

The following series implements support for 1G trasparent hugepage on
x86 for device dax. The bulk of the code was written by Mathew Wilcox
a while back supporting transparent 1G hugepage for fs DAX. I have
forward ported the relevant bits to 4.10-rc. The current submission has
only the necessary code to support device DAX.

Well, you should really explain why do we want this functionality... Is
anybody going to use it? Why would he want to and what will he gain by
doing so? Because so far I haven't heard of a convincing usecase.

								Honza

---

Dave Jiang (1):
      dax: Support for transparent PUD pages for device DAX

Matthew Wilcox (2):
      mm,fs,dax: Change ->pmd_fault to ->huge_fault
      mm,x86: Add support for PUD-sized transparent hugepages


 arch/Kconfig                          |    3 
 arch/x86/Kconfig                      |    1 
 arch/x86/include/asm/paravirt.h       |   11 +
 arch/x86/include/asm/paravirt_types.h |    2 
 arch/x86/include/asm/pgtable-2level.h |   17 ++
 arch/x86/include/asm/pgtable-3level.h |   24 +++
 arch/x86/include/asm/pgtable.h        |  145 +++++++++++++++++++
 arch/x86/include/asm/pgtable_64.h     |   15 ++
 arch/x86/kernel/paravirt.c            |    1 
 arch/x86/mm/pgtable.c                 |   31 ++++
 drivers/dax/dax.c                     |   82 ++++++++---
 fs/dax.c                              |   43 ++++--
 fs/ext2/file.c                        |    2 
 fs/ext4/file.c                        |    6 -
 fs/xfs/xfs_file.c                     |   10 +
 fs/xfs/xfs_trace.h                    |    2 
 include/asm-generic/pgtable.h         |   75 +++++++++-
 include/asm-generic/tlb.h             |   14 ++
 include/linux/dax.h                   |    6 -
 include/linux/huge_mm.h               |   83 ++++++++++-
 include/linux/mm.h                    |   40 +++++
 include/linux/mmu_notifier.h          |   14 ++
 include/linux/pfn_t.h                 |    8 +
 mm/gup.c                              |    7 +
 mm/huge_memory.c                      |  249 +++++++++++++++++++++++++++++++++
 mm/memory.c                           |  102 ++++++++++++--
 mm/pagewalk.c                         |   20 +++
 mm/pgtable-generic.c                  |   14 ++
 28 files changed, 952 insertions(+), 75 deletions(-)

-- 
Jan Kara [off-list ref]
SUSE Labs, CR

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