Re: [RFC][PATCH 0/3] locking/qspinlock: Improve determinism for x86

[Thomas Gleixner]

On Wed, 26 Sep 2018, Sebastian Andrzej Siewior wrote:

> On 2018-09-26 13:01:17 [+0200], Peter Zijlstra wrote:
> > In particular this ordering ensures a concurrent unlock cannot trigger
> > the uncontended handoff. Also it ensures that if the xchg() happens
> > after a (successful) trylock, we must observe that LOCKED bit.
> 
> so I backported a bunch of atomic files and qspinlock back to v4.9-RT in
> order to get these patches applied. The backported kernel booted and
> showed the same symptomps within seconds (those I reported last FR).
> With those three patches ontop I have the Core2Duo 10 minutes in
> testing without any issuesâ

Remember that 4.14 took almost 8 hours to fail, so I'd recommend not to
cheer too much. Let's see what it tells us in 48 hours.

Thanks,

	tglx