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Re: Question on the five-level page table support patches

From Andi Kleen <ak@linux.intel.com>
Newsgroups linux.kernel
Subject Re: Question on the five-level page table support patches
Date 2017-04-24 15:10 +0200
Message-ID <tzLUB-7pd-3@gated-at.bofh.it> (permalink)
References <tznpf-7qm-5@gated-at.bofh.it> <tzEzL-2JP-11@gated-at.bofh.it>
Organization linux.* mail to news gateway

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> Can you explain what the issue is?  What used to work on Linux and
> doesn't any more?  The man page is quite clear:

In old Linux hint was a search hint, so if there isn't a hole
at the hinted area it will search starting from there for a hole
instead of giving up immediately.

Now it just gives up, which means every user has to implement
their own search.

Yes I ran into the same problem and it's annoying. It broke
originally when top down mmap was added I believe

Before the augmented rbtree it was potentially very expensive, but now
it should be cheap.

-Andi

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Thread

Question on the five-level page table support patches John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> - 2017-04-23 13:00 +0200
  Re: Question on the five-level page table support patches Andy Lutomirski <luto@kernel.org> - 2017-04-24 07:20 +0200
    Re: Question on the five-level page table support patches Andi Kleen <ak@linux.intel.com> - 2017-04-24 15:10 +0200
      Re: Question on the five-level page table support patches John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> - 2017-04-24 22:40 +0200
  Re: Question on the five-level page table support patches "Kirill A. Shutemov" <kirill@shutemov.name> - 2017-04-24 18:30 +0200
    Re: Question on the five-level page table support patches John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> - 2017-04-24 22:40 +0200
      Re: Question on the five-level page table support patches "Kirill A. Shutemov" <kirill@shutemov.name> - 2017-04-25 00:10 +0200
      Re: Question on the five-level page table support patches David Miller <davem@davemloft.net> - 2017-04-25 00:20 +0200
        Re: Question on the five-level page table support patches Jon Masters <jcm@jonmasters.org> - 2017-04-25 09:30 +0200

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