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Re: [RFC][PATCH -v2 4/4] locking/mutex: Add lock handoff to avoid starvation

From Peter Zijlstra <peterz@infradead.org>
Newsgroups linux.kernel
Subject Re: [RFC][PATCH -v2 4/4] locking/mutex: Add lock handoff to avoid starvation
Date 2016-08-26 17:20 +0200
Message-ID <sar5f-nz-1@gated-at.bofh.it> (permalink)
References <sa7SV-4G3-9@gated-at.bofh.it> <sa7SW-4G3-27@gated-at.bofh.it> <sabjP-72N-5@gated-at.bofh.it> <sabjP-72N-3@gated-at.bofh.it> <sar5f-nz-3@gated-at.bofh.it>
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On Fri, Aug 26, 2016 at 10:30:31AM -0400, Waiman Long wrote:
> On 08/25/2016 06:23 PM, Peter Zijlstra wrote:

> >You're right.. I'll try again tomorrow.
> 
> Actually, it is also OK to handoff from NULL=>new, but nothing else is
> appropriate.

I pushed out new patches to git, could you have a peek?

 - killed another of that mutex abuse
 - fixed ATOMIC_FETCH_OP for SH4
 - split: rm arch/*/include/asm/mutex*.h include/asm-generic/mutex*.h
   into a separate patch to aid in review
 - fixed lockdep
 - added an uncontended unlock fast path, to mirror the unconteded lock
   fast path
 - reworked the handoff stuff (again)

I didn't try and be too clever, since its far too hot to think.

Still need to look at adding spinning to the handoff case.
Also need to look at writing (much) better changelogs, they stink.

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[RFC][PATCH -v2 0/4] locking/mutex: Rewrite basic mutex Peter Zijlstra <peterz@infradead.org> - 2016-08-25 20:50 +0200
  [RFC][PATCH -v2 3/4] locking/mutex: Allow MUTEX_SPIN_ON_OWNER when DEBUG_MUTEXES Peter Zijlstra <peterz@infradead.org> - 2016-08-25 20:50 +0200
  [RFC][PATCH -v2 4/4] locking/mutex: Add lock handoff to avoid starvation Peter Zijlstra <peterz@infradead.org> - 2016-08-25 20:50 +0200
    Re: [RFC][PATCH -v2 4/4] locking/mutex: Add lock handoff to avoid  starvation Peter Zijlstra <peterz@infradead.org> - 2016-08-26 00:30 +0200
      Re: [RFC][PATCH -v2 4/4] locking/mutex: Add lock handoff to avoid  starvation Peter Zijlstra <peterz@infradead.org> - 2016-08-26 17:20 +0200
        Re: [RFC][PATCH -v2 4/4] locking/mutex: Add lock handoff to avoid  starvation Peter Zijlstra <peterz@infradead.org> - 2016-08-29 17:50 +0200
          Re: [RFC][PATCH -v2 4/4] locking/mutex: Add lock handoff to avoid  starvation Peter Zijlstra <peterz@infradead.org> - 2016-08-30 14:00 +0200

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