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

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Date:   Mon, 26 Sep 2016 19:28:08 +0200
From:   Gerald Schaefer <gerald.schaefer@...ibm.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Naoya Horiguchi <n-horiguchi@...jp.nec.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Michal Hocko <mhocko@...e.cz>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Rui Teng <rui.teng@...ux.vnet.ibm.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>
Subject: [PATCH v4 0/3] mm/hugetlb: memory offline issues with hugepages

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