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Re: [Qemu-devel] [PATCH 10/17] mm: rmap preparation for remap_anon_pages
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From: |
Linus Torvalds |
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Subject: |
Re: [Qemu-devel] [PATCH 10/17] mm: rmap preparation for remap_anon_pages |
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Date: |
Tue, 7 Oct 2014 08:47:59 -0400 |
On Mon, Oct 6, 2014 at 12:41 PM, Andrea Arcangeli <address@hidden> wrote:
>
> Of course if somebody has better ideas on how to resolve an anonymous
> userfault they're welcome.
So I'd *much* rather have a "write()" style interface (ie _copying_
bytes from user space into a newly allocated page that gets mapped)
than a "remap page" style interface
remapping anonymous pages involves page table games that really aren't
necessarily a good idea, and tlb invalidates for the old page etc.
Just don't do it.
Linus
- [Qemu-devel] [PATCH 11/17] mm: swp_entry_swapcount, (continued)
- [Qemu-devel] [PATCH 11/17] mm: swp_entry_swapcount, Andrea Arcangeli, 2014/10/03
- [Qemu-devel] [PATCH 15/17] userfaultfd: make userfaultfd_write non blocking, Andrea Arcangeli, 2014/10/03
- [Qemu-devel] [PATCH 13/17] waitqueue: add nr wake parameter to __wake_up_locked_key, Andrea Arcangeli, 2014/10/03
- [Qemu-devel] [PATCH 09/17] mm: PT lock: export double_pt_lock/unlock, Andrea Arcangeli, 2014/10/03
- [Qemu-devel] [PATCH 07/17] mm: madvise MADV_USERFAULT: prepare vm_flags to allow more than 32bits, Andrea Arcangeli, 2014/10/03
- [Qemu-devel] [PATCH 10/17] mm: rmap preparation for remap_anon_pages, Andrea Arcangeli, 2014/10/03
- Re: [Qemu-devel] [PATCH 10/17] mm: rmap preparation for remap_anon_pages, Linus Torvalds, 2014/10/03
- Re: [Qemu-devel] [PATCH 10/17] mm: rmap preparation for remap_anon_pages, Dr. David Alan Gilbert, 2014/10/06
- Re: [Qemu-devel] [PATCH 10/17] mm: rmap preparation for remap_anon_pages, Andrea Arcangeli, 2014/10/06
- Re: [Qemu-devel] [PATCH 10/17] mm: rmap preparation for remap_anon_pages,
Linus Torvalds <=
- Re: [Qemu-devel] [PATCH 10/17] mm: rmap preparation for remap_anon_pages, Andrea Arcangeli, 2014/10/07
- Re: [Qemu-devel] [PATCH 10/17] mm: rmap preparation for remap_anon_pages, Andrea Arcangeli, 2014/10/07
- Re: [Qemu-devel] [PATCH 10/17] mm: rmap preparation for remap_anon_pages, Andy Lutomirski, 2014/10/07
- Re: [Qemu-devel] [PATCH 10/17] mm: rmap preparation for remap_anon_pages, Peter Feiner, 2014/10/07
- Re: [Qemu-devel] [PATCH 10/17] mm: rmap preparation for remap_anon_pages, Linus Torvalds, 2014/10/07
- Re: [Qemu-devel] [PATCH 10/17] mm: rmap preparation for remap_anon_pages, Dr. David Alan Gilbert, 2014/10/07
- Re: [Qemu-devel] [PATCH 10/17] mm: rmap preparation for remap_anon_pages, Paolo Bonzini, 2014/10/07
- Re: [Qemu-devel] [PATCH 10/17] mm: rmap preparation for remap_anon_pages, Dr. David Alan Gilbert, 2014/10/07
Re: [Qemu-devel] [PATCH 10/17] mm: rmap preparation for remap_anon_pages, Kirill A. Shutemov, 2014/10/07