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From: Andrea Arcangeli <aarcange@redhat.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	Mike Rapoport <rppt@linux.vnet.ibm.com>,
	Mike Kravetz <mike.kravetz@oracle.com>,
	Peter Xu <peterx@redhat.com>,
	"Dr. David Alan Gilbert" <dgilbert@redhat.com>
Subject: [PATCH 0/1] mm/hugetlb.c: teach follow_hugetlb_page() to handle FOLL_NOWAIT
Date: Tue,  8 Jan 2019 21:02:02 -0500	[thread overview]
Message-ID: <20190109020203.26669-1-aarcange@redhat.com> (raw)

Hello,

this fixes a regression that resurfaced in hugetlbfs code after we
fixed it for the core VM a few months ago. This is only reproducible
doing postcopy live migration of KVM (the only user of FOLL_NOWAIT) if
backed by hugetlbfs memory. It's unrelated to userfaultfd, but
userfaultfd reproduces it easily because it's an heavy user of
VM_FAULT_RETRY retvals.

Thanks,
Andrea

Andrea Arcangeli (1):
  mm/hugetlb.c: teach follow_hugetlb_page() to handle FOLL_NOWAIT

 mm/hugetlb.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

             reply	other threads:[~2019-01-09  2:02 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-09  2:02 Andrea Arcangeli [this message]
2019-01-09  2:02 ` [PATCH 1/1] " Andrea Arcangeli
2019-01-09  2:53   ` Mike Kravetz
2019-01-09  5:05   ` Peter Xu

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