[0/2] Make alloc_contig_range handle Hugetlb pages

Message

Oscar Salvador Feb. 17, 2021, 10:08 a.m. UTC

Hi, 

this is the new version of [1].

 RFC -> v1:
 - Drop RFC
 - Addressed feedback from David and Mike
 - Fence off gigantic pages as there is a cyclic dependency between
   them and alloc_contig_range
 - Re-organize the code to make race-window smaller and to put
   all details in hugetlb code
 - Drop nodemask initialization. First a node will be tried and then we
   will back to other nodes containing memory (N_MEMORY). Details in
   patch#1's changelog
 - Count new page as surplus in case we failed to dissolve the old page
   and the new one. Details in patch#1.

I already have a patch that uses the new alloc_and_dissolve() from hotplug
code, but I decided to leave that patch out until this patchset is settled.

[1] https://patchwork.kernel.org/project/linux-mm/list/?series=429833

Oscar Salvador (2):
  mm: Make alloc_contig_range handle free hugetlb pages
  mm: Make alloc_contig_range handle in-use hugetlb pages

 include/linux/hugetlb.h |  7 ++++
 mm/compaction.c         | 21 +++++++++++
 mm/hugetlb.c            | 93 +++++++++++++++++++++++++++++++++++++++++++++++++
 mm/vmscan.c             |  5 +--
 4 files changed, 124 insertions(+), 2 deletions(-)