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Re: Is it safe for kthreadd to drain_all_pages?

From Michal Hocko <mhocko@kernel.org>
Newsgroups linux.kernel
Subject Re: Is it safe for kthreadd to drain_all_pages?
Date 2017-04-07 18:50 +0200
Message-ID <ttFfc-1ms-25@gated-at.bofh.it> (permalink)
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On Fri 07-04-17 09:25:33, Hugh Dickins wrote:
[...]
> 24 hours so far, and with a clean /var/log/messages.  Not conclusive
> yet, and of course I'll leave it running another couple of days, but
> I'm increasingly sure that it works as you intended: I agree that
> 
> mm-move-pcp-and-lru-pcp-drainging-into-single-wq.patch
> mm-move-pcp-and-lru-pcp-drainging-into-single-wq-fix.patch
> 
> should go to Linus as soon as convenient.  Though I think the commit
> message needs something a bit stronger than "Quite annoying though".
> Maybe add a line:
> 
> Fixes serious hang under load, observed repeatedly on 4.11-rc.

Yeah, it is much less theoretical now. I will rephrase and ask Andrew to
update the chagelog and send it to Linus once I've got your final go.

Thanks!

-- 
Michal Hocko
SUSE Labs

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Thread

Is it safe for kthreadd to drain_all_pages? Hugh Dickins <hughd@google.com> - 2017-04-05 23:10 +0200
  Re: Is it safe for kthreadd to drain_all_pages? Michal Hocko <mhocko@kernel.org> - 2017-04-06 11:00 +0200
  Re: Is it safe for kthreadd to drain_all_pages? Mel Gorman <mgorman@techsingularity.net> - 2017-04-06 15:10 +0200
    Re: Is it safe for kthreadd to drain_all_pages? Hugh Dickins <hughd@google.com> - 2017-04-06 21:00 +0200
      Re: Is it safe for kthreadd to drain_all_pages? Hugh Dickins <hughd@google.com> - 2017-04-07 18:30 +0200
        Re: Is it safe for kthreadd to drain_all_pages? Michal Hocko <mhocko@kernel.org> - 2017-04-07 18:50 +0200
          Re: Is it safe for kthreadd to drain_all_pages? Hugh Dickins <hughd@google.com> - 2017-04-07 19:00 +0200
            Re: Is it safe for kthreadd to drain_all_pages? Michal Hocko <mhocko@kernel.org> - 2017-04-07 19:30 +0200
              Re: Is it safe for kthreadd to drain_all_pages? Hugh Dickins <hughd@google.com> - 2017-04-07 20:50 +0200
                Re: Is it safe for kthreadd to drain_all_pages? Hugh Dickins <hughd@google.com> - 2017-04-08 19:10 +0200
                Re: Is it safe for kthreadd to drain_all_pages? Mel Gorman <mgorman@techsingularity.net> - 2017-04-08 20:10 +0200

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