Re: Q. drm/i915 shrinker, synchronize_rcu_expedited() from handlers

From	"J. R. Okajima" <hooanon05g@gmail.com>
Newsgroups	linux.kernel
Subject	Re: Q. drm/i915 shrinker, synchronize_rcu_expedited() from handlers
Date	2017-05-06 01:30 +0200
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Joonas Lahtinen:
> Filing a bug in freedesktop.org with all the details is the fastest way
> of getting help. Without the bug (and with such little information as
> the previous e-mail) it's hard to estimate the extent and nature of the
> bug.

My original report was
http://marc.info/?l=linux-kernel&m=149313183203325&w=2

The report contained
- kernel command line options
- lockdep msg
- call trace
but it didn't look drm/i915 shrinker is related. It was git-bisect which
lead me to drm/i915 shrinker.


> I've anyway gone and prepared a patch to drop the RCU sync completely
> from shrinker phase, as discussed originally with Chris.

Thank you.
I don't know whether the fix is good to me or not yet. I will test your
fix, but I am busy now and my test will be a few weeks later. Other
people may want the fix soon. So I'd suggest you to reproduce the
problem on your side. I guess "mem=1G" or "mem=512M" will make it easier
to reproduce the problem.
Of course, if you are sure the fix is correct, then you don't have to
wait for my test. Release it soon for other people.


J. R. Okajima

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Q. drm/i915 shrinker, synchronize_rcu_expedited() from handlers "J. R. Okajima" <hooanon05g@gmail.com> - 2017-04-30 08:10 +0200
  Re: Q. drm/i915 shrinker, synchronize_rcu_expedited() from handlers Andrea Arcangeli <aarcange@redhat.com> - 2017-04-30 11:50 +0200
    Re: Q. drm/i915 shrinker, synchronize_rcu_expedited() from handlers "J. R. Okajima" <hooanon05g@gmail.com> - 2017-05-01 04:10 +0200
      Re: Q. drm/i915 shrinker, synchronize_rcu_expedited() from handlers Joonas Lahtinen <joonas.lahtinen@linux.intel.com> - 2017-05-05 11:50 +0200
        Re: Q. drm/i915 shrinker, synchronize_rcu_expedited() from  handlers Hugh Dickins <hughd@google.com> - 2017-05-06 00:00 +0200
          Re: Q. drm/i915 shrinker, synchronize_rcu_expedited() from handlers Joonas Lahtinen <joonas.lahtinen@linux.intel.com> - 2017-05-08 10:10 +0200
            Re: Q. drm/i915 shrinker, synchronize_rcu_expedited() from  handlers Hugh Dickins <hughd@google.com> - 2017-05-10 05:10 +0200
              Re: Q. drm/i915 shrinker, synchronize_rcu_expedited() from handlers Joonas Lahtinen <joonas.lahtinen@linux.intel.com> - 2017-05-10 12:00 +0200
              Re: Q. drm/i915 shrinker, synchronize_rcu_expedited() from handlers Andrea Arcangeli <aarcange@redhat.com> - 2017-05-10 12:50 +0200
                Re: Q. drm/i915 shrinker, synchronize_rcu_expedited() from handlers Joonas Lahtinen <joonas.lahtinen@linux.intel.com> - 2017-05-10 13:10 +0200
        Re: Q. drm/i915 shrinker, synchronize_rcu_expedited() from handlers "J. R. Okajima" <hooanon05g@gmail.com> - 2017-05-06 01:30 +0200

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