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Re: [PATCH v3 01/17] mm: support madvise(MADV_FREE)

From Daniel Micay <danielmicay@gmail.com>
Newsgroups linux.kernel
Subject Re: [PATCH v3 01/17] mm: support madvise(MADV_FREE)
Date 2015-11-13 07:50 +0100
Message-ID <quglj-2Vm-13@gated-at.bofh.it> (permalink)
References (2 earlier) <qtS9l-4gx-13@gated-at.bofh.it> <qtSCl-4HV-1@gated-at.bofh.it> <qufSi-2Lr-3@gated-at.bofh.it> <qufSi-2Lr-13@gated-at.bofh.it> <qugbE-2S1-1@gated-at.bofh.it>
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> And now I am thinking if we use access bit, we could implment MADV_FREE_UNDO
> easily when we need it. Maybe, that's what you want. Right?

Yes, but why the access bit instead of the dirty bit for that? It could
always be made more strict (i.e. access bit) in the future, while going
the other way won't be possible. So I think the dirty bit is really the
more conservative choice since if it turns out to be a mistake it can be
fixed without a backwards incompatible change.

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Thread

[PATCH v3 00/17] MADFV_FREE support Minchan Kim <minchan@kernel.org> - 2015-11-12 05:40 +0100
  [PATCH v3 08/17] x86: add pmd_[dirty|mkclean] for THP Minchan Kim <minchan@kernel.org> - 2015-11-12 05:40 +0100
  [PATCH v3 01/17] mm: support madvise(MADV_FREE) Minchan Kim <minchan@kernel.org> - 2015-11-12 05:40 +0100
    Re: [PATCH v3 01/17] mm: support madvise(MADV_FREE) Andy Lutomirski <luto@amacapital.net> - 2015-11-12 06:00 +0100
      Re: [PATCH v3 01/17] mm: support madvise(MADV_FREE) Daniel Micay <danielmicay@gmail.com> - 2015-11-12 06:30 +0100
        Re: [PATCH v3 01/17] mm: support madvise(MADV_FREE) Minchan Kim <minchan@kernel.org> - 2015-11-13 07:20 +0100
          Re: [PATCH v3 01/17] mm: support madvise(MADV_FREE) Daniel Micay <danielmicay@gmail.com> - 2015-11-13 07:20 +0100
            Re: [PATCH v3 01/17] mm: support madvise(MADV_FREE) Minchan Kim <minchan@kernel.org> - 2015-11-13 07:40 +0100
              Re: [PATCH v3 01/17] mm: support madvise(MADV_FREE) Daniel Micay <danielmicay@gmail.com> - 2015-11-13 07:50 +0100
                Re: [PATCH v3 01/17] mm: support madvise(MADV_FREE) Minchan Kim <minchan@kernel.org> - 2015-11-13 08:10 +0100
                Re: [PATCH v3 01/17] mm: support madvise(MADV_FREE) Daniel Micay <danielmicay@gmail.com> - 2015-11-13 09:20 +0100
                Re: [PATCH v3 01/17] mm: support madvise(MADV_FREE) Andy Lutomirski <luto@amacapital.net> - 2015-11-13 20:50 +0100
                Re: [PATCH v3 01/17] mm: support madvise(MADV_FREE) Minchan Kim <minchan@kernel.org> - 2015-11-16 03:20 +0100
                Re: [PATCH v3 01/17] mm: support madvise(MADV_FREE) yalin wang <yalin.wang2010@gmail.com> - 2015-11-16 04:20 +0100
    Re: [PATCH v3 01/17] mm: support madvise(MADV_FREE) "Kirill A. Shutemov" <kirill@shutemov.name> - 2015-11-12 12:30 +0100
      Re: [PATCH v3 01/17] mm: support madvise(MADV_FREE) Minchan Kim <minchan@kernel.org> - 2015-11-13 07:20 +0100
  [PATCH v3 11/17] arm: add pmd_mkclean for THP Minchan Kim <minchan@kernel.org> - 2015-11-12 05:40 +0100

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