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Date:   Mon, 8 Apr 2019 17:13:36 -0700
From:   Ira Weiny <ira.weiny@...el.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        John Hubbard <jhubbard@...dia.com>,
        Michal Hocko <mhocko@...e.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        "David S. Miller" <davem@...emloft.net>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Rich Felker <dalias@...c.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Ralf Baechle <ralf@...ux-mips.org>,
        James Hogan <jhogan@...nel.org>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        linux-mips@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
        sparclinux@...r.kernel.org, linux-rdma@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH V3 0/7] Add FOLL_LONGTERM to GUP fast and use it

On Thu, Mar 28, 2019 at 01:44:15AM -0700, 'Ira Weiny' wrote:
> From: Ira Weiny <ira.weiny@...el.com>
> 
> Following discussion and review[1] here are the cleanups requested.
> 
> The biggest change for V3 was the disabling of the ability to use FOLL_LONGTERM
> in get_user_pages[unlocked|locked|remote]
> 
> Comments were also enhanced throughout to show potential users what
> FOLL_LONGTERM is all about and limitations it has.

Does anyone have any problems with these changes?

I would like to get official Reviewed-by tags if possible.

Thanks,
Ira

> 
> Minor review comments were fixed
> 
> Original cover letter:
> 
> 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 FS DAX pages.
> 
> Introduce FOLL_LONGTERM and use this flag in get_user_pages_fast() which
> retains the performance while also adding the FS DAX checks.  XDP has also
> shown interest in using this functionality.[1]
> 
> In addition we change get_user_pages() to use the new FOLL_LONGTERM flag and
> remove the specialized get_user_pages_longterm call.
> 
> [1] https://lkml.org/lkml/2019/3/19/939
> 
> 
> 
> Ira Weiny (7):
>   mm/gup: Replace get_user_pages_longterm() with FOLL_LONGTERM
>   mm/gup: Change write parameter to flags in fast walk
>   mm/gup: Change GUP fast to use flags rather than a write 'bool'
>   mm/gup: Add FOLL_LONGTERM capability to GUP fast
>   IB/hfi1: Use the new FOLL_LONGTERM flag to get_user_pages_fast()
>   IB/qib: Use the new FOLL_LONGTERM flag to get_user_pages_fast()
>   IB/mthca: Use the new FOLL_LONGTERM flag to get_user_pages_fast()
> 
>  arch/mips/mm/gup.c                          |  11 +-
>  arch/powerpc/kvm/book3s_64_mmu_hv.c         |   4 +-
>  arch/powerpc/kvm/e500_mmu.c                 |   2 +-
>  arch/powerpc/mm/mmu_context_iommu.c         |   3 +-
>  arch/s390/kvm/interrupt.c                   |   2 +-
>  arch/s390/mm/gup.c                          |  12 +-
>  arch/sh/mm/gup.c                            |  11 +-
>  arch/sparc/mm/gup.c                         |   9 +-
>  arch/x86/kvm/paging_tmpl.h                  |   2 +-
>  arch/x86/kvm/svm.c                          |   2 +-
>  drivers/fpga/dfl-afu-dma-region.c           |   2 +-
>  drivers/gpu/drm/via/via_dmablit.c           |   3 +-
>  drivers/infiniband/core/umem.c              |   5 +-
>  drivers/infiniband/hw/hfi1/user_pages.c     |   3 +-
>  drivers/infiniband/hw/mthca/mthca_memfree.c |   3 +-
>  drivers/infiniband/hw/qib/qib_user_pages.c  |   8 +-
>  drivers/infiniband/hw/qib/qib_user_sdma.c   |   2 +-
>  drivers/infiniband/hw/usnic/usnic_uiom.c    |   9 +-
>  drivers/media/v4l2-core/videobuf-dma-sg.c   |   6 +-
>  drivers/misc/genwqe/card_utils.c            |   2 +-
>  drivers/misc/vmw_vmci/vmci_host.c           |   2 +-
>  drivers/misc/vmw_vmci/vmci_queue_pair.c     |   6 +-
>  drivers/platform/goldfish/goldfish_pipe.c   |   3 +-
>  drivers/rapidio/devices/rio_mport_cdev.c    |   4 +-
>  drivers/sbus/char/oradax.c                  |   2 +-
>  drivers/scsi/st.c                           |   3 +-
>  drivers/staging/gasket/gasket_page_table.c  |   4 +-
>  drivers/tee/tee_shm.c                       |   2 +-
>  drivers/vfio/vfio_iommu_spapr_tce.c         |   3 +-
>  drivers/vfio/vfio_iommu_type1.c             |   3 +-
>  drivers/vhost/vhost.c                       |   2 +-
>  drivers/video/fbdev/pvr2fb.c                |   2 +-
>  drivers/virt/fsl_hypervisor.c               |   2 +-
>  drivers/xen/gntdev.c                        |   2 +-
>  fs/io_uring.c                               |   5 +-
>  fs/orangefs/orangefs-bufmap.c               |   2 +-
>  include/linux/mm.h                          |  45 ++-
>  kernel/futex.c                              |   2 +-
>  lib/iov_iter.c                              |   7 +-
>  mm/gup.c                                    | 288 +++++++++++++-------
>  mm/gup_benchmark.c                          |   5 +-
>  mm/util.c                                   |   8 +-
>  net/ceph/pagevec.c                          |   2 +-
>  net/rds/info.c                              |   2 +-
>  net/rds/rdma.c                              |   3 +-
>  net/xdp/xdp_umem.c                          |   4 +-
>  46 files changed, 314 insertions(+), 200 deletions(-)
> 
> -- 
> 2.20.1
> 

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