From: Mike Kravetz <mike.kravetz@oracle.com>
To: linux-mm@kvack.org, linux-kernel@vger.kernel.org
Cc: Muchun Song <songmuchun@bytedance.com>,
Miaohe Lin <linmiaohe@huawei.com>,
David Hildenbrand <david@redhat.com>,
Sven Schnelle <svens@linux.ibm.com>,
Michal Hocko <mhocko@suse.com>, Peter Xu <peterx@redhat.com>,
Naoya Horiguchi <naoya.horiguchi@linux.dev>,
"Aneesh Kumar K . V" <aneesh.kumar@linux.vnet.ibm.com>,
Andrea Arcangeli <aarcange@redhat.com>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
Davidlohr Bueso <dave@stgolabs.net>,
Prakash Sangappa <prakash.sangappa@oracle.com>,
James Houghton <jthoughton@google.com>,
Mina Almasry <almasrymina@google.com>,
Pasha Tatashin <pasha.tatashin@soleen.com>,
Axel Rasmussen <axelrasmussen@google.com>,
Ray Fucillo <Ray.Fucillo@intersystems.com>,
Andrew Morton <akpm@linux-foundation.org>,
Mike Kravetz <mike.kravetz@oracle.com>
Subject: [PATCH 0/3] hugetlb: fixes for new vma lock series
Date: Tue, 4 Oct 2022 18:17:04 -0700 [thread overview]
Message-ID: <20221005011707.514612-1-mike.kravetz@oracle.com> (raw)
In review of the series "hugetlb: Use new vma lock for huge pmd sharing
synchronization", Miaohe Lin pointed out two key issues:
1) There is a race in the routine hugetlb_unmap_file_folio when locks
are dropped and reacquired in the correct order [1].
2) With the switch to using vma lock for fault/truncate synchronization,
we need to make sure lock exists for all VM_MAYSHARE vmas, not just
vmas capable of pmd sharing.
These two issues are addressed here. In addition, having a vma lock
present in all VM_MAYSHARE vmas, uncovered some issues around vma
splitting. Those are also addressed.
The series "hugetlb: Use new vma lock for huge pmd sharing synchronization"
is currently in mm-stable and may soon be merged??? This is why I am
sending 'fixes' to that series instead of a new version. If a new
version of the series is preferred, I can do that. Just wanted to get
these changes out for review.
[1] https://lore.kernel.org/linux-mm/01f10195-7088-4462-6def-909549c75ef4@huawei.com/
Mike Kravetz (3):
hugetlb: fix vma lock handling during split vma and range unmapping
hugetlb: take hugetlb vma_lock when clearing vma_lock->vma pointer
hugetlb: allocate vma lock for all sharable vmas
mm/hugetlb.c | 127 +++++++++++++++++++++++++++------------------------
mm/memory.c | 4 --
2 files changed, 68 insertions(+), 63 deletions(-)
--
2.37.3
next reply other threads:[~2022-10-05 1:17 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-05 1:17 Mike Kravetz [this message]
2022-10-05 1:17 ` [PATCH 1/3] hugetlb: fix vma lock handling during split vma and range unmapping Mike Kravetz
2022-10-15 1:25 ` Miaohe Lin
2022-10-18 2:56 ` Mike Kravetz
2022-10-18 6:25 ` Miaohe Lin
2022-10-05 1:17 ` [PATCH 2/3] hugetlb: take hugetlb vma_lock when clearing vma_lock->vma pointer Mike Kravetz
2022-10-05 3:48 ` kernel test robot
2022-10-05 6:58 ` kernel test robot
2022-10-06 3:30 ` Mike Kravetz
2022-10-15 1:32 ` Miaohe Lin
2022-10-05 1:17 ` [PATCH 3/3] hugetlb: allocate vma lock for all sharable vmas Mike Kravetz
2022-10-15 1:40 ` Miaohe Lin
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