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Message-ID: <20190227191442.GB31669@iweiny-DESK2.sc.intel.com>
Date: Wed, 27 Feb 2019 11:14:42 -0800
From: Ira Weiny <ira.weiny@...el.com>
To: John Hubbard <jhubbard@...dia.com>,
Andrew Morton <akpm@...ux-foundation.org>,
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>,
Paul Burton <paul.burton@...s.com>,
James Hogan <jhogan@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.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, kvm-ppc@...r.kernel.org,
kvm@...r.kernel.org, linux-fpga@...r.kernel.org,
dri-devel@...ts.freedesktop.org, linux-rdma@...r.kernel.org,
linux-media@...r.kernel.org, linux-scsi@...r.kernel.org,
devel@...verdev.osuosl.org,
virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
linux-fbdev@...r.kernel.org, xen-devel@...ts.xenproject.org,
devel@...ts.orangefs.org, ceph-devel@...r.kernel.org,
rds-devel@....oracle.com
Subject: Re: [RESEND PATCH 0/7] Add FOLL_LONGTERM to GUP fast and use it
On Tue, Feb 19, 2019 at 09:30:33PM -0800, 'Ira Weiny' wrote:
> From: Ira Weiny <ira.weiny@...el.com>
>
> 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.
>
> 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.[2]
>
> 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/2019/2/11/237
> [2] https://lkml.org/lkml/2019/2/11/1789
Is there anything I need to do on this series or does anyone have any
objections to it going into 5.1? And if so who's tree is it going to go
through?
Thanks,
Ira
>
> 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 | 4 +-
> 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 | 5 +-
> 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/orangefs/orangefs-bufmap.c | 2 +-
> include/linux/mm.h | 17 +-
> kernel/futex.c | 2 +-
> lib/iov_iter.c | 7 +-
> mm/gup.c | 220 ++++++++++++--------
> mm/gup_benchmark.c | 5 +-
> mm/util.c | 8 +-
> net/ceph/pagevec.c | 2 +-
> net/rds/info.c | 2 +-
> net/rds/rdma.c | 3 +-
> 44 files changed, 232 insertions(+), 180 deletions(-)
>
> --
> 2.20.1
>
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