linux-kernel - [RFC PATCH 0/3] Add mmap(MAP

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Message-Id: <20171012014611.18725-1-mike.kravetz@oracle.com>
Date:   Wed, 11 Oct 2017 18:46:08 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        linux-api@...r.kernel.org
Cc:     Marek Szyprowski <m.szyprowski@...sung.com>,
        Michal Nazarewicz <mina86@...a86.com>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Guy Shattah <sguy@...lanox.com>,
        Christoph Lameter <cl@...ux.com>,
        Anshuman Khandual <khandual@...ux.vnet.ibm.com>,
        Laura Abbott <labbott@...hat.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Mike Kravetz <mike.kravetz@...cle.com>
Subject: [RFC PATCH 0/3] Add mmap(MAP_CONTIG) support

The following is a 'possible' way to add such functionality.  I just
did what was easy and pre-allocated contiguous pages which are used
to populate the mapping.  I did not use any of the higher order
allocators such as alloc_contig_range.  Therefore, it is limited to
allocations of MAX_ORDER size.  Also, the allocations should probably
be done outside mmap_sem but that was the easiest place to do it in
this quick and easy POC.

I just wanted to throw out some code to get further ideas.  It is far
from complete.

Mike Kravetz (3):
  mm/map_contig: Add VM_CONTIG flag to vma struct
  mm/map_contig: Use pre-allocated pages for VM_CONTIG mappings
  mm/map_contig: Add mmap(MAP_CONTIG) support

 include/linux/mm.h              |  1 +
 include/uapi/asm-generic/mman.h |  1 +
 kernel/fork.c                   |  2 +-
 mm/memory.c                     | 13 +++++-
 mm/mmap.c                       | 94 +++++++++++++++++++++++++++++++++++++++++
 5 files changed, 109 insertions(+), 2 deletions(-)

-- 
2.13.6