Re: [patch] mm, thp: always direct reclaim for MADV_HUGEPAGE even when deferred

From	Michal Hocko <mhocko@kernel.org>
Newsgroups	linux.kernel
Subject	Re: [patch] mm, thp: always direct reclaim for MADV_HUGEPAGE even when deferred
Date	2016-12-30 14:00 +0100
Message-ID	<sU4WS-4sk-13@gated-at.bofh.it> (permalink)
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On Fri 30-12-16 12:36:20, Mel Gorman wrote:
[...]
> I'll neither ack nor nak this patch. However, I would much prefer an
> additional option be added to sysfs called defer-fault that would avoid
> all fault-based stalls but still potentially stall for MADV_HUGEPAGE.

Would you consider changing the semantic of defer=madvise to invoke
KSWAPD for !madvised vmas as acceptable. It would be a change in
semantic but I am wondering what would be a risk and potential
regression space.

Also I am planning to send a pro-active compaction based on a
"watermark" as an LSF/MM topic proposal. I suspect that no additional
thp specific tunable will be needed if we have a proper compaction
watermark tunable.
-- 
Michal Hocko
SUSE Labs

Thread

[patch] mm, thp: always direct reclaim for MADV_HUGEPAGE even when  deferred David Rientjes <rientjes@google.com> - 2016-12-22 01:30 +0100
  Re: [patch] mm, thp: always direct reclaim for MADV_HUGEPAGE even  when deferred "Kirill A. Shutemov" <kirill@shutemov.name> - 2016-12-22 09:40 +0100
  Re: [patch] mm, thp: always direct reclaim for MADV_HUGEPAGE even  when deferred Michal Hocko <mhocko@kernel.org> - 2016-12-22 11:10 +0100
    Re: [patch] mm, thp: always direct reclaim for MADV_HUGEPAGE even  when deferred David Rientjes <rientjes@google.com> - 2016-12-22 22:10 +0100
      Re: [patch] mm, thp: always direct reclaim for MADV_HUGEPAGE even  when deferred Michal Hocko <mhocko@kernel.org> - 2016-12-23 10:00 +0100
        Re: [patch] mm, thp: always direct reclaim for MADV_HUGEPAGE even  when deferred David Rientjes <rientjes@google.com> - 2016-12-23 11:10 +0100
          Re: [patch] mm, thp: always direct reclaim for MADV_HUGEPAGE even  when deferred Michal Hocko <mhocko@kernel.org> - 2016-12-23 12:20 +0100
            Re: [patch] mm, thp: always direct reclaim for MADV_HUGEPAGE even  when deferred David Rientjes <rientjes@google.com> - 2016-12-23 23:50 +0100
              Re: [patch] mm, thp: always direct reclaim for MADV_HUGEPAGE even  when deferred Michal Hocko <mhocko@kernel.org> - 2016-12-26 10:10 +0100
                Re: [patch] mm, thp: always direct reclaim for MADV_HUGEPAGE even  when deferred David Rientjes <rientjes@google.com> - 2016-12-27 02:00 +0100
                Re: [patch] mm, thp: always direct reclaim for MADV_HUGEPAGE even  when deferred "Kirill A. Shutemov" <kirill@shutemov.name> - 2016-12-27 03:40 +0100
                Re: [patch] mm, thp: always direct reclaim for MADV_HUGEPAGE even  when deferred Michal Hocko <mhocko@kernel.org> - 2016-12-27 10:50 +0100
                Re: [patch] mm, thp: always direct reclaim for MADV_HUGEPAGE even  when deferred David Rientjes <rientjes@google.com> - 2016-12-27 22:40 +0100
                Re: [patch] mm, thp: always direct reclaim for MADV_HUGEPAGE even  when deferred Michal Hocko <mhocko@kernel.org> - 2016-12-28 09:50 +0100
                Re: [patch] mm, thp: always direct reclaim for MADV_HUGEPAGE even  when deferred David Rientjes <rientjes@google.com> - 2016-12-28 22:40 +0100
                Re: [patch] mm, thp: always direct reclaim for MADV_HUGEPAGE even  when deferred Michal Hocko <mhocko@kernel.org> - 2016-12-29 09:30 +0100
      Re: [patch] mm, thp: always direct reclaim for MADV_HUGEPAGE even  when deferred Mel Gorman <mgorman@techsingularity.net> - 2016-12-30 13:40 +0100
        Re: [patch] mm, thp: always direct reclaim for MADV_HUGEPAGE even  when deferred Michal Hocko <mhocko@kernel.org> - 2016-12-30 14:00 +0100
          Re: [patch] mm, thp: always direct reclaim for MADV_HUGEPAGE even  when deferred Mel Gorman <mgorman@techsingularity.net> - 2016-12-30 15:10 +0100
        Re: [patch] mm, thp: always direct reclaim for MADV_HUGEPAGE even  when deferred David Rientjes <rientjes@google.com> - 2016-12-30 23:40 +0100
          Re: [patch] mm, thp: always direct reclaim for MADV_HUGEPAGE even  when deferred Mel Gorman <mgorman@techsingularity.net> - 2017-01-03 11:40 +0100
  Re: [patch] mm, thp: always direct reclaim for MADV_HUGEPAGE even  when deferred Vlastimil Babka <vbabka@suse.cz> - 2017-01-02 09:40 +0100

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