linux-kernel - Re: [PATCH -v4 1/8] locking/drm: Kill mutex trickery

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Date:   Tue, 18 Oct 2016 13:57:31 +0100
From:   Chris Wilson <chris@...is-wilson.co.uk>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Waiman Long <waiman.long@....com>,
        Jason Low <jason.low2@....com>,
        Ding Tianhong <dingtianhong@...wei.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <Will.Deacon@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Imre Deak <imre.deak@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Davidlohr Bueso <dave@...olabs.net>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Terry Rudd <terry.rudd@....com>,
        "Paul E. McKenney" <paulmck@...ibm.com>,
        Jason Low <jason.low2@...com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Rob Clark <robdclark@...il.com>
Subject: Re: [PATCH -v4 1/8] locking/drm: Kill mutex trickery

On Tue, Oct 18, 2016 at 02:48:41PM +0200, Peter Zijlstra wrote:
> On Fri, Oct 07, 2016 at 04:52:44PM +0200, Peter Zijlstra wrote:
> > Poking at lock internals is not cool. Since I'm going to change the
> > implementation this will break, take it out.
> > 
> > Cc: Daniel Vetter <daniel.vetter@...ll.ch>
> > Cc: Chris Wilson <chris@...is-wilson.co.uk>
> > Cc: Rob Clark <robdclark@...il.com>
> > Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> > ---
> >  drivers/gpu/drm/i915/i915_gem_shrinker.c |   26 +++-----------------------
> >  drivers/gpu/drm/msm/msm_gem_shrinker.c   |   23 +++--------------------
> >  2 files changed, 6 insertions(+), 43 deletions(-)
> 
> OK, so it appears that i915 changed their locking around and got rid of
> this thing entirely. Much appreciated Chris!!

It's not dead yet! Sorry.

It's close though, in the next cycle we may be at a point where we don't
rely on recursion locking in the shrinker.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre