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* [PATCH 0/3] Interface for higher order contiguous allocations
@ 2018-04-17  2:09 Mike Kravetz
  2018-04-17  2:09 ` [PATCH 1/3] mm: change type of free_contig_range(nr_pages) to unsigned long Mike Kravetz
                   ` (2 more replies)
  0 siblings, 3 replies; 13+ messages in thread
From: Mike Kravetz @ 2018-04-17  2:09 UTC (permalink / raw)
  To: linux-mm, linux-kernel, linux-api
  Cc: Reinette Chatre, Michal Hocko, Christopher Lameter, Guy Shattah,
	Anshuman Khandual, Michal Nazarewicz, Vlastimil Babka,
	David Nellans, Laura Abbott, Pavel Machek, Dave Hansen,
	Andrew Morton, Mike Kravetz

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


^ permalink raw reply	[flat|nested] 13+ messages in thread

end of thread, other threads:[~2018-06-06  9:32 UTC | newest]

Thread overview: 13+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-04-17  2:09 [PATCH 0/3] Interface for higher order contiguous allocations Mike Kravetz
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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