Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1605093

Re: [PATCH 26/26] x86/mm: allow to have userspace mappings above 47-bits

From Matthew Wilcox <willy@infradead.org>
Newsgroups linux.kernel
Subject Re: [PATCH 26/26] x86/mm: allow to have userspace mappings above 47-bits
Date 2017-03-20 20:40 +0100
Message-ID <tnbjP-VN-17@gated-at.bofh.it> (permalink)
References (2 earlier) <tm6Pg-3DI-7@gated-at.bofh.it> <tmq1z-12n-9@gated-at.bofh.it> <tmEnT-2TE-1@gated-at.bofh.it> <tn9UO-8sD-123@gated-at.bofh.it> <tn9UN-8sD-121@gated-at.bofh.it>
Organization linux.* mail to news gateway

Show all headers | View raw

On Mon, Mar 20, 2017 at 11:08:41AM -0700, hpa@zytor.com wrote:
> On March 19, 2017 1:26:58 AM PDT, "Kirill A. Shutemov" <kirill@shutemov.name> wrote:
> >On Mar 19, 2017 09:25, "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> wrote:
> > > What is the epectation when the hint addr is below 128TB but addr + len
> > > 128TB ? Should such mmap request fail ?
> >
> >Yes, I believe so.
> 
> This *better* be conditional on some kind of settable limit.  Having a
> barrier in the middle of the address space for no apparent reason to
> "clean" software is insane.

I disagree with Kirill here.  If addr+len > 128TB, I think we should
assume the application is 57-bit aware.

Specifying hint addresses is such a rare thing to do anyway.

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Re: [PATCH 26/26] x86/mm: allow to have userspace mappings above 47-bits "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> - 2017-03-17 21:40 +0100
  Re: [PATCH 26/26] x86/mm: allow to have userspace mappings above  47-bits "Kirill A. Shutemov" <kirill@shutemov.name> - 2017-03-18 18:10 +0100
    Re: [PATCH 26/26] x86/mm: allow to have userspace mappings above 47-bits "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> - 2017-03-19 09:30 +0100
      Re: [PATCH 26/26] x86/mm: allow to have userspace mappings above 47-bits "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> - 2017-03-19 14:10 +0100
        Re: [PATCH 26/26] x86/mm: allow to have userspace mappings above  47-bits "Kirill A. Shutemov" <kirill@shutemov.name> - 2017-03-24 10:10 +0100
      Re: [PATCH 26/26] x86/mm: allow to have userspace mappings above 47-bits Michael Ellerman <mpe@ellerman.id.au> - 2017-03-20 10:20 +0100
      Re: [PATCH 26/26] x86/mm: allow to have userspace mappings above 47-bits hpa@zytor.com - 2017-03-20 19:10 +0100
        Re: [PATCH 26/26] x86/mm: allow to have userspace mappings above  47-bits Matthew Wilcox <willy@infradead.org> - 2017-03-20 20:40 +0100
        Re: [PATCH 26/26] x86/mm: allow to have userspace mappings above  47-bits "Kirill A. Shutemov" <kirill@shutemov.name> - 2017-03-24 10:10 +0100

csiph-web