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Re: Memory-ordering recipes

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On Sun, Sep 17, 2017 at 04:05:09PM -0700, Paul E. McKenney wrote:

> So what litmus tests are needed?  Here is my initial set:
> 
> 1.	Release-acquire chains, AKA ISA2, Z6.2, LB, and 3.LB
> 
> 	Lots of variety here, can in some cases substitute:
> 	
> 	a.	READ_ONCE() for smp_load_acquire()
> 	b.	WRITE_ONCE() for smp_store_release()
> 	c.	Dependencies for both smp_load_acquire() and
> 		smp_store_release().
> 	d.	smp_wmb() for smp_store_release() in first thread
> 		of ISA2 and Z6.2.
> 	e.	smp_rmb() for smp_load_acquire() in last thread of ISA2.
> 
> 2.	MP (see test6.pdf for nickname translation)
> 
> 	a.	smp_store_release() / smp_load_acquire()
> 	b.	rcu_assign_pointer() / rcu_dereference()
> 	c.	smp_wmb() / smp_rmb()
> 	d.	Replacing either of the above with smp_mb()
> 
> 3.	SB
> 
> 	a.	smp_mb(), as in lockless wait-wakeup coordination.
> 		And as in sys_membarrier()-scheduler coordination,
> 		for that matter.
> 
> Others?

So I have no idea what you're proposing here. The above is just a bunch
of words without meaning :-(

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Memory-ordering recipes "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-09-18 01:10 +0200
  Re: Memory-ordering recipes Boqun Feng <boqun.feng@gmail.com> - 2017-09-18 10:00 +0200
    Re: Memory-ordering recipes "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-09-18 16:30 +0200
      Re: Memory-ordering recipes Boqun Feng <boqun.feng@gmail.com> - 2017-09-19 04:10 +0200
  Re: Memory-ordering recipes Peter Zijlstra <peterz@infradead.org> - 2017-09-21 14:50 +0200
    Re: Memory-ordering recipes "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-09-21 17:30 +0200
      Re: Memory-ordering recipes Peter Zijlstra <peterz@infradead.org> - 2017-09-21 18:20 +0200
        Re: Memory-ordering recipes "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-09-21 18:50 +0200
          Re: Memory-ordering recipes Peter Zijlstra <peterz@infradead.org> - 2017-09-22 11:30 +0200
            Re: Memory-ordering recipes "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-09-22 23:10 +0200

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