linux-kernel - Re: Q. drm/i915 shrinker, synchronize_rcu

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Message-ID: <1495432920.4034.4.camel@linux.intel.com>
Date:   Mon, 22 May 2017 09:02:00 +0300
From:   Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>
To:     "J. R. Okajima" <hooanon05g@...il.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        chris@...is-wilson.co.uk, daniel.vetter@...ll.ch,
        jani.nikula@...el.com, linux-kernel@...r.kernel.org
Subject: Re: Q. drm/i915 shrinker, synchronize_rcu_expedited() from handlers

On la, 2017-05-20 at 10:56 +0900, J. R. Okajima wrote:
> "J. R. Okajima":
> > 
> > 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.
> 
> Now I am going to able to run my local test.
> But V3 patch failed to apply onto v4.11.0.
> 
> Would you provide us two versions of the patch, one for v4.11 series and
> the other of v4.12-rcN?

For v4.12-rc2 the backport is here:

https://patchwork.freedesktop.org/patch/156990/

For quick testing on older kernels, just remove all lines with "_rcu"
in drivers/gpu/drm/i915/i915_gem_shrinker.c .

Regards, Joonas

PS: It'll help to subscribe to and track our mailing list at
intel-gfx@...ts.freedesktop.org for future convenience.
-- 
Joonas Lahtinen
Open Source Technology Center
Intel Corporation