From: Miaohe Lin <linmiaohe@huawei.com>
To: Mike Kravetz <mike.kravetz@oracle.com>, <linux-mm@kvack.org>,
<linux-kernel@vger.kernel.org>
Cc: Muchun Song <songmuchun@bytedance.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>
Subject: Re: [PATCH 3/3] hugetlb: allocate vma lock for all sharable vmas
Date: Sat, 15 Oct 2022 09:40:18 +0800 [thread overview]
Message-ID: <9e6af9e5-025c-8674-63bb-139e441eba74@huawei.com> (raw)
In-Reply-To: <20221005011707.514612-4-mike.kravetz@oracle.com>
On 2022/10/5 9:17, Mike Kravetz wrote:
> The hugetlb vma lock was originally designed to synchronize pmd sharing.
> As such, it was only necessary to allocate the lock for vmas that were
> capable of pmd sharing. Later in the development cycle, it was discovered
> that it could also be used to simplify fault/truncation races as described
> in [1]. However, a subsequent change to allocate the lock for all vmas
> that use the page cache was never made. A fault/truncation race could
> leave pages in a file past i_size until the file is removed.
>
> Remove the previous restriction and allocate lock for all VM_MAYSHARE
> vmas. Warn in the unlikely event of allocation failure.
>
> Fixes: "hugetlb: clean up code checking for fault/truncation races"
> Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
I believe this is a feasible solution. Thanks.
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Thanks,
Miaohe Lin
prev parent reply other threads:[~2022-10-15 1:40 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-05 1:17 [PATCH 0/3] hugetlb: fixes for new vma lock series Mike Kravetz
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 [this message]
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