linux-kernel - [PATCH 0/4] hugetlbfs: use hinode_rwsem for pmd sharing synchronization

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Message-Id: <20201103002841.273161-1-mike.kravetz@oracle.com>
Date:   Mon,  2 Nov 2020 16:28:37 -0800
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     Hugh Dickins <hughd@...gle.com>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        Michal Hocko <mhocko@...nel.org>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Prakash Sangappa <prakash.sangappa@...cle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Kravetz <mike.kravetz@...cle.com>
Subject: [PATCH 0/4] hugetlbfs: use hinode_rwsem for pmd sharing synchronization

The RFC series reverted all patches where i_mmap_rwsem was used for
pmd sharing synchronization, and then added code to use hinode_rwsem.
This series ends up with the same code in the end, but is structured
as follows:

- Revert the page fault/truncation race patch which depends on i_mmap_rwsem
  always being taken in page fault path.
- Add hinode_rwsem to hugetlbfs specific inode and supporting routines.
- Convert code from using i_mmap_rwsem for pmd sharing synchronization
  to using hinode_rwsem.
- Add code to more robustly deal with page fault/truncation races.

My hope is that this will be easier to review.

Mike Kravetz (4):
  Revert hugetlbfs: Use i_mmap_rwsem to address page fault/truncate race
  hugetlbfs: add hinode_rwsem to hugetlb specific inode
  hugetlbfs: use hinode_rwsem for pmd sharing synchronization
  huegtlbfs: handle page fault/truncate races

 fs/hugetlbfs/inode.c    | 105 +++++++++-------
 include/linux/fs.h      |  15 ---
 include/linux/hugetlb.h | 129 ++++++++++++++++++--
 mm/hugetlb.c            | 262 ++++++++++++++++------------------------
 mm/memory-failure.c     |  34 ++----
 mm/memory.c             |   5 +
 mm/migrate.c            |  34 +++---
 mm/rmap.c               |  21 ++--
 mm/userfaultfd.c        |  17 ++-
 9 files changed, 334 insertions(+), 288 deletions(-)

-- 
2.28.0