From: "J. R. Okajima" <hooanon05g@gmail.com>
Subject: Re: Q. drm/i915 shrinker, synchronize_rcu_expedited() from handlers
To: Andrea Arcangeli <aarcange@redhat.com>
Cc: joonas.lahtinen@linux.intel.com, chris@chris-wilson.co.uk,
        daniel.vetter@ffwll.ch, jani.nikula@intel.com,
        linux-kernel@vger.kernel.org
In-Reply-To: <20170430094348.GA5970@redhat.com>
References: <7743.1493532478@jrobl> <20170430094348.GA5970@redhat.com>
Date: Mon, 01 May 2017 11:05:28 +0900
Message-ID: <16988.1493604328@jrobl>
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 783
Lines: 22

Thanx for the reply.

Andrea Arcangeli:
> Yes I already reported this, my original fix was way more efficient
> (and also safer considering the above) than what landed upstream. My
> feedback was ignored though.
>
> https://lists.freedesktop.org/archives/intel-gfx/2017-April/125414.html

I see.
Actually on my test system for v4.11-rc8, kthreadd, kworker, kswapd and
others all stopped working due to the synchronize_rcu_expedited call
from i915_gem_shrinker_count. It is definitly a show stopper for me as
an i915 user.

It was a few weeks ago when you posted. It is a pity the fix was not
merged before v4.11 comes out. I know v4.11 will appear soon. So I'd ask
i915 developers, would you test Andrea Arcangeli's fix and release it as
v4.11.1 as soon as possible?


J. R. Okajima