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Re: [Xen-devel] [RESEND PATCH 0/7] Add FOLL_LONGTERM to GUP fast and use it
- To: ira.weiny@xxxxxxxxx
- From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
- Date: Wed, 20 Feb 2019 07:19:30 -0800
- Cc: linux-fbdev@xxxxxxxxxxxxxxx, Michal Hocko <mhocko@xxxxxxxx>, kvm@xxxxxxxxxxxxxxx, linux-sh@xxxxxxxxxxxxxxx, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, James Hogan <jhogan@xxxxxxxxxx>, linux-fpga@xxxxxxxxxxxxxxx, Heiko Carstens <heiko.carstens@xxxxxxxxxx>, dri-devel@xxxxxxxxxxxxxxxxxxxxx, linux-mips@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, Rich Felker <dalias@xxxxxxxx>, Paul Mackerras <paulus@xxxxxxxxx>, sparclinux@xxxxxxxxxxxxxxx, ceph-devel@xxxxxxxxxxxxxxx, devel@xxxxxxxxxxxxxxxxxxxx, linux-s390@xxxxxxxxxxxxxxx, rds-devel@xxxxxxxxxxxxxx, Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>, linux-rdma@xxxxxxxxxxxxxxx, Jason Gunthorpe <jgg@xxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, devel@xxxxxxxxxxxxxxxxxx, linux-media@xxxxxxxxxxxxxxx, John Hubbard <jhubbard@xxxxxxxxxx>, kvm-ppc@xxxxxxxxxxxxxxx, Borislav Petkov <bp@xxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx, linux-scsi@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Ralf Baechle <ralf@xxxxxxxxxxxxxx>, Paul Burton <paul.burton@xxxxxxxx>, Martin Schwidefsky <schwidefsky@xxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, linuxppc-dev@xxxxxxxxxxxxxxxx, "David S. Miller" <davem@xxxxxxxxxxxxx>, "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
- Delivery-date: Wed, 20 Feb 2019 15:21:21 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Tue, Feb 19, 2019 at 09:30:33PM -0800, ira.weiny@xxxxxxxxx wrote:
> From: Ira Weiny <ira.weiny@xxxxxxxxx>
>
> Resending these as I had only 1 minor comment which I believe we have covered
> in this series. I was anticipating these going through the mm tree as they
> depend on a cleanup patch there and the IB changes are very minor. But they
> could just as well go through the IB tree.
>
> NOTE: This series depends on my clean up patch to remove the write parameter
> from gup_fast_permitted()[1]
>
> HFI1, qib, and mthca, use get_user_pages_fast() due to it performance
> advantages. These pages can be held for a significant time. But
> get_user_pages_fast() does not protect against mapping of FS DAX pages.
This I don't get - if you do lock down long term mappings performance
of the actual get_user_pages call shouldn't matter to start with.
What do I miss?
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