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From: Mike Kravetz <mike.kravetz@oracle.com>
To: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	linux-api@vger.kernel.org
Cc: Reinette Chatre <reinette.chatre@intel.com>,
	Michal Hocko <mhocko@kernel.org>,
	Christopher Lameter <cl@linux.com>,
	Guy Shattah <sguy@mellanox.com>,
	Anshuman Khandual <khandual@linux.vnet.ibm.com>,
	Michal Nazarewicz <mina86@mina86.com>,
	Vlastimil Babka <vbabka@suse.cz>,
	David Nellans <dnellans@nvidia.com>,
	Laura Abbott <labbott@redhat.com>, Pavel Machek <pavel@ucw.cz>,
	Dave Hansen <dave.hansen@intel.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Mike Kravetz <mike.kravetz@oracle.com>
Subject: [PATCH 0/3] Interface for higher order contiguous allocations
Date: Mon, 16 Apr 2018 19:09:12 -0700	[thread overview]
Message-ID: <20180417020915.11786-1-mike.kravetz@oracle.com> (raw)

These patches came out of the "[RFC] mmap(MAP_CONTIG)" discussions at:
http://lkml.kernel.org/r/21f1ec96-2822-1189-1c95-79a2bb491571@oracle.com

One suggestion in that thread was to create a friendlier interface that
could be used by drivers and others outside core mm code to allocate a
contiguous set of pages.  The alloc_contig_range() interface is used for
this purpose today by CMA and gigantic page allocation.  However, this is
not a general purpose interface.  So, wrap alloc_contig_range() in the
more general interface:

struct page *find_alloc_contig_pages(unsigned int order, gfp_t gfp, int nid,
                                        nodemask_t *nodemask)

This interface is essentially the same functionality provided by the
hugetlb specific routine alloc_gigantic_page().  After creating the
interface, change alloc_gigantic_page() to call find_alloc_contig_pages()
and delete all the supporting code in hugetlb.c.

A new use case for allocating contiguous memory has been identified in
Intel(R) Resource Director Technology Cache Pseudo-Locking.

Mike Kravetz (3):
  mm: change type of free_contig_range(nr_pages) to unsigned long
  mm: add find_alloc_contig_pages() interface
  mm/hugetlb: use find_alloc_contig_pages() to allocate gigantic pages

 include/linux/gfp.h | 14 +++++++-
 mm/cma.c            |  2 +-
 mm/hugetlb.c        | 87 ++++--------------------------------------------
 mm/page_alloc.c     | 95 ++++++++++++++++++++++++++++++++++++++++++++++++++---
 4 files changed, 110 insertions(+), 88 deletions(-)

-- 
2.13.6


             reply	other threads:[~2018-04-17  2:10 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-17  2:09 Mike Kravetz [this message]
2018-04-17  2:09 ` [PATCH 1/3] mm: change type of free_contig_range(nr_pages) to unsigned long Mike Kravetz
2018-04-17  2:09 ` [PATCH 2/3] mm: add find_alloc_contig_pages() interface Mike Kravetz
2018-04-17 12:10   ` kbuild test robot
2018-04-18  1:39     ` Mike Kravetz
2018-04-17 14:19   ` kbuild test robot
2018-04-21 16:16   ` Vlastimil Babka
2018-05-02 21:13     ` Mike Kravetz
2018-06-06  9:32       ` Michal Hocko
2018-04-23  0:09   ` Michal Hocko
2018-04-23  4:22     ` Mike Kravetz
2018-04-24 13:37       ` Michal Hocko
2018-04-17  2:09 ` [PATCH 3/3] mm/hugetlb: use find_alloc_contig_pages() to allocate gigantic pages Mike Kravetz

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