From: Linus Torvalds <torvalds@linux-foundation.org>
To: Andrea Arcangeli <aarcange@redhat.com>
Cc: qemu-devel@nongnu.org, KVM list <kvm@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>,
Linux API <linux-api@vger.kernel.org>,
Android Kernel Team <kernel-team@android.com>,
"Kirill A. Shutemov" <kirill@shutemov.name>,
Pavel Emelyanov <xemul@parallels.com>,
Sanidhya Kashyap <sanidhya.gatech@gmail.com>,
zhang.zhanghailiang@huawei.com,
Andres Lagar-Cavilla <andreslc@google.com>,
Dave Hansen <dave@sr71.net>, Paolo Bonzini <pbonzini@redhat.com>,
Rik van Riel <riel@redhat.com>, Mel Gorman <mgorman@suse.de>,
Andy Lutomirski <luto@amacapital.net>,
Andrew Morton <akpm@linux-foundation.org>,
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Michel Lespinasse <walken@google.com>,
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Keith Packard <keithp@keithp.com>,
"Huangpeng (Peter)" <peter.huangpeng@huawei.com>,
Anthony Liguori <anthony@codemonkey.ws>,
Stefan Hajnoczi <stefanha@gmail.com>,
Wenchao Xia <wenchaoqemu@gmail.com>,
Andrew Jones <drjones@redhat.com>,
Juan Quintela <quintela@redhat.com>
Subject: Re: [PATCH 19/21] userfaultfd: remap_pages: UFFDIO_REMAP preparation
Date: Thu, 5 Mar 2015 11:32:24 -0800 [thread overview]
Message-ID: <CA+55aFzK7kyZH0eiBH2CNDJ+p0oQYDZpm8tZitTgedOJz_He5Q@mail.gmail.com> (raw)
In-Reply-To: <20150305185112.GL4280@redhat.com>
On Thu, Mar 5, 2015 at 10:51 AM, Andrea Arcangeli <aarcange@redhat.com> wrote:
>
> Thanks for your idea that the UFFDIO_COPY is faster, the userland code
> we submitted for qemu only uses UFFDIO_COPY|ZEROPAGE, it never uses
> UFFDIO_REMAP.
Ok. So there's no actual expected use of the remap interface. Good.
That makes this series more palatable, since the rest didn't raise my
hackles much.
(But yeah, the documentation patch didn't really explain the uses very
much or at all, so I think something more is needed in that area).
Linus
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next prev parent reply other threads:[~2015-03-05 19:32 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-05 17:17 [PATCH 00/21] RFC: userfaultfd v3 Andrea Arcangeli
2015-03-05 17:17 ` [PATCH 01/21] userfaultfd: waitqueue: add nr wake parameter to __wake_up_locked_key Andrea Arcangeli
2015-03-05 17:17 ` [PATCH 02/21] userfaultfd: linux/Documentation/vm/userfaultfd.txt Andrea Arcangeli
2015-03-06 15:39 ` [Qemu-devel] " Eric Blake
2015-03-05 17:17 ` [PATCH 03/21] userfaultfd: uAPI Andrea Arcangeli
2015-03-05 17:17 ` [PATCH 04/21] userfaultfd: linux/userfaultfd_k.h Andrea Arcangeli
2015-03-05 17:17 ` [PATCH 05/21] userfaultfd: add vm_userfaultfd_ctx to the vm_area_struct Andrea Arcangeli
2015-03-05 17:48 ` Pavel Emelyanov
2015-03-05 17:17 ` [PATCH 06/21] userfaultfd: add VM_UFFD_MISSING and VM_UFFD_WP Andrea Arcangeli
2015-03-05 17:17 ` [PATCH 07/21] userfaultfd: call handle_userfault() for userfaultfd_missing() faults Andrea Arcangeli
2015-03-05 17:17 ` [PATCH 08/21] userfaultfd: teach vma_merge to merge across vma->vm_userfaultfd_ctx Andrea Arcangeli
2015-03-05 17:17 ` [PATCH 09/21] userfaultfd: prevent khugepaged to merge if userfaultfd is armed Andrea Arcangeli
2015-03-05 17:17 ` [PATCH 10/21] userfaultfd: add new syscall to provide memory externalization Andrea Arcangeli
2015-03-05 17:57 ` Pavel Emelyanov
2015-03-06 10:48 ` Michael Kerrisk (man-pages)
2015-03-05 17:17 ` [PATCH 11/21] userfaultfd: buildsystem activation Andrea Arcangeli
2015-03-05 17:17 ` [PATCH 12/21] userfaultfd: activate syscall Andrea Arcangeli
2015-03-05 17:17 ` [PATCH 13/21] userfaultfd: UFFDIO_COPY|UFFDIO_ZEROPAGE uAPI Andrea Arcangeli
2015-03-05 17:17 ` [PATCH 14/21] userfaultfd: mcopy_atomic|mfill_zeropage: UFFDIO_COPY|UFFDIO_ZEROPAGE preparation Andrea Arcangeli
2015-03-05 18:07 ` Pavel Emelyanov
2015-03-05 17:17 ` [PATCH 15/21] userfaultfd: UFFDIO_COPY and UFFDIO_ZEROPAGE Andrea Arcangeli
2015-03-05 17:17 ` [PATCH 16/21] userfaultfd: remap_pages: rmap preparation Andrea Arcangeli
2015-03-05 17:18 ` [PATCH 17/21] userfaultfd: remap_pages: swp_entry_swapcount() preparation Andrea Arcangeli
2015-03-05 17:18 ` [PATCH 18/21] userfaultfd: UFFDIO_REMAP uABI Andrea Arcangeli
2015-03-05 17:18 ` [PATCH 19/21] userfaultfd: remap_pages: UFFDIO_REMAP preparation Andrea Arcangeli
2015-03-05 17:39 ` Linus Torvalds
2015-03-05 18:51 ` Andrea Arcangeli
2015-03-05 19:32 ` Linus Torvalds [this message]
2015-03-05 18:01 ` Pavel Emelyanov
2015-03-05 17:18 ` [PATCH 20/21] userfaultfd: UFFDIO_REMAP Andrea Arcangeli
2015-03-05 17:18 ` [PATCH 21/21] userfaultfd: add userfaultfd_wp mm helpers Andrea Arcangeli
2015-03-05 18:15 ` [PATCH 00/21] RFC: userfaultfd v3 Pavel Emelyanov
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