From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Andrea Arcangeli <aarcange@redhat.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Mike Rapoport <rppt@linux.vnet.ibm.com>,
"Dr. David Alan Gilbert" <dgilbert@redhat.com>,
Hillf Danton <hillf.zj@alibaba-inc.com>,
Pavel Emelyanov <xemul@parallels.com>
Subject: Re: [PATCH] userfaultfd: hugetlbfs: add UFFDIO_COPY support for shared mappings
Date: Thu, 23 Feb 2017 17:56:23 +0300 [thread overview]
Message-ID: <20170223145623.GA855@node.shutemov.name> (raw)
In-Reply-To: <20170222151507.GI5037@redhat.com>
On Wed, Feb 22, 2017 at 04:15:07PM +0100, Andrea Arcangeli wrote:
> On Tue, Feb 21, 2017 at 04:25:45PM +0300, Kirill A. Shutemov wrote:
> > I think more strict vma_is_anonymous() is a good thing.
> >
> > But I don't see a point introducing one more helper. Let's just make the
> > existing helper work better.
>
> That would be simpler agreed. The point of having an "unsafe" faster
> version was only for code running in page fault context where the
> additional check is unnecessary.
Well, I don't think that the cost of additional check is significant here.
And we can bring ->vm_ops a bit closer to ->vm_flags to avoid potential
cache miss.
--
Kirill A. Shutemov
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prev parent reply other threads:[~2017-02-23 14:56 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-15 21:46 [PATCH] userfaultfd: hugetlbfs: add UFFDIO_COPY support for shared mappings Mike Kravetz
2017-02-16 18:41 ` Andrea Arcangeli
2017-02-17 0:18 ` Mike Kravetz
2017-02-17 15:52 ` Andrea Arcangeli
2017-02-17 20:17 ` Andrew Morton
2017-02-17 20:51 ` Andrea Arcangeli
2017-02-17 21:08 ` Andrew Morton
2017-02-17 21:34 ` Andrea Arcangeli
2017-02-21 13:25 ` Kirill A. Shutemov
2017-02-22 15:15 ` Andrea Arcangeli
2017-02-23 14:56 ` Kirill A. Shutemov [this message]
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