From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mike Kravetz Subject: [RFC PATCH 0/3] Add mmap(MAP_CONTIG) support Date: Wed, 11 Oct 2017 18:46:08 -0700 Message-ID: <20171012014611.18725-1-mike.kravetz@oracle.com> References: <21f1ec96-2822-1189-1c95-79a2bb491571@oracle.com> Return-path: In-Reply-To: <21f1ec96-2822-1189-1c95-79a2bb491571@oracle.com> Sender: owner-linux-mm@kvack.org To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-api@vger.kernel.org Cc: Marek Szyprowski , Michal Nazarewicz , "Aneesh Kumar K . V" , Joonsoo Kim , Guy Shattah , Christoph Lameter , Anshuman Khandual , Laura Abbott , Vlastimil Babka , Mike Kravetz List-Id: linux-api@vger.kernel.org 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org