From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Mike Kravetz <mike.kravetz@oracle.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Michal Hocko <mhocko@kernel.org>, Hugh Dickins <hughd@google.com>,
Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
"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>,
Andrew Morton <akpm@linux-foundation.org>,
stable@vger.kernel.org
Subject: Re: [PATCH v2 2/2] hugetlbfs: Use i_mmap_rwsem to fix page fault/truncate race
Date: Fri, 21 Dec 2018 13:28:24 +0300 [thread overview]
Message-ID: <20181221102824.5v36l6l5t2zthpgr@kshutemo-mobl1> (raw)
In-Reply-To: <20181218223557.5202-3-mike.kravetz@oracle.com>
On Tue, Dec 18, 2018 at 02:35:57PM -0800, Mike Kravetz wrote:
> Instead of writing the required complicated code for this rare
> occurrence, just eliminate the race. i_mmap_rwsem is now held in read
> mode for the duration of page fault processing. Hold i_mmap_rwsem
> longer in truncation and hold punch code to cover the call to
> remove_inode_hugepages.
One of remove_inode_hugepages() callers is noticeably missing --
hugetlbfs_evict_inode(). Why?
It at least deserves a comment on why the lock rule doesn't apply to it.
--
Kirill A. Shutemov
next prev parent reply other threads:[~2018-12-21 10:28 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-18 22:35 [PATCH v2 0/2] hugetlbfs: use i_mmap_rwsem for better synchronization Mike Kravetz
2018-12-18 22:35 ` [PATCH v2 1/2] hugetlbfs: use i_mmap_rwsem for more pmd sharing synchronization Mike Kravetz
2018-12-19 1:24 ` Sasha Levin
2018-12-21 10:05 ` Kirill A. Shutemov
2018-12-21 18:20 ` Mike Kravetz
2018-12-18 22:35 ` [PATCH v2 2/2] hugetlbfs: Use i_mmap_rwsem to fix page fault/truncate race Mike Kravetz
2018-12-19 1:24 ` Sasha Levin
2018-12-21 10:28 ` Kirill A. Shutemov [this message]
2018-12-21 18:28 ` Mike Kravetz
2018-12-21 20:21 ` Kirill A. Shutemov
2018-12-21 22:17 ` Mike Kravetz
2018-12-22 22:14 ` Kirill A. Shutemov
2018-12-20 21:06 ` [PATCH v2 0/2] hugetlbfs: use i_mmap_rwsem for better synchronization Andrew Morton
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