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Groups > linux.kernel > #1491453

[PATCH v4 0/3] mm/hugetlb: memory offline issues with hugepages

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This addresses several issues with hugepages and memory offline. While
the first patch fixes a panic, and is therefore rather important, the
last patch is just a performance optimization.

The second patch fixes a theoretical issue with reserved hugepages,
while still leaving some ugly usability issue, see description.

Changes in v4:
- Add check for free vs. reserved hugepages
- Revalidate checks in dissolve_free_huge_page() after taking the lock
- Split up into 3 patches

Changes in v3:
- Add Fixes: c8721bbb
- Add Cc: stable
- Elaborate on losing the gigantic page vs. failing memory offline
- Move page_count() check out of dissolve_free_huge_page()

Changes in v2:
- Update comment in dissolve_free_huge_pages()
- Change locking in dissolve_free_huge_page()

Gerald Schaefer (3):
  mm/hugetlb: fix memory offline with hugepage size > memory block size
  mm/hugetlb: check for reserved hugepages during memory offline
  mm/hugetlb: improve locking in dissolve_free_huge_pages()

 include/linux/hugetlb.h |  6 +++---
 mm/hugetlb.c            | 47 +++++++++++++++++++++++++++++++++++------------
 mm/memory_hotplug.c     |  4 +++-
 3 files changed, 41 insertions(+), 16 deletions(-)

-- 
2.8.4

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[PATCH v4 0/3] mm/hugetlb: memory offline issues with hugepages Gerald Schaefer <gerald.schaefer@de.ibm.com> - 2016-09-26 19:30 +0200
  [PATCH v4 2/3] mm/hugetlb: check for reserved hugepages during memory offline Gerald Schaefer <gerald.schaefer@de.ibm.com> - 2016-09-26 19:30 +0200
    Re: [PATCH v4 2/3] mm/hugetlb: check for reserved hugepages during  memory offline Michal Hocko <mhocko@kernel.org> - 2016-09-29 14:40 +0200
      Re: [PATCH v4 2/3] mm/hugetlb: check for reserved hugepages during  memory offline Mike Kravetz <mike.kravetz@oracle.com> - 2016-09-29 19:20 +0200
        Re: [PATCH v4 2/3] mm/hugetlb: check for reserved hugepages during  memory offline Michal Hocko <mhocko@kernel.org> - 2016-09-30 08:40 +0200
  [PATCH v4 3/3] mm/hugetlb: improve locking in dissolve_free_huge_pages() Gerald Schaefer <gerald.schaefer@de.ibm.com> - 2016-09-26 19:30 +0200
    Re: [PATCH v4 3/3] mm/hugetlb: improve locking in  dissolve_free_huge_pages() Michal Hocko <mhocko@kernel.org> - 2016-09-29 14:40 +0200
  [PATCH v4 1/3] mm/hugetlb: fix memory offline with hugepage size > memory block size Gerald Schaefer <gerald.schaefer@de.ibm.com> - 2016-09-26 19:30 +0200
    Re: [PATCH v4 1/3] mm/hugetlb: fix memory offline with hugepage size  > memory block size Michal Hocko <mhocko@kernel.org> - 2016-09-29 14:20 +0200
  Re: [PATCH v4 0/3] mm/hugetlb: memory offline issues with hugepages Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> - 2016-09-29 08:20 +0200

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