linux-kernel - Re: Severe performance regression w/ 4.4+ on Android due to cgroup locking changes

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Date:	Wed, 13 Jul 2016 14:18:41 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	John Stultz <john.stultz@...aro.org>,
	Ingo Molnar <mingo@...hat.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Dmitry Shmidt <dimitrysh@...gle.com>,
	Rom Lemarchand <romlem@...gle.com>,
	Colin Cross <ccross@...gle.com>, Todd Kjos <tkjos@...gle.com>,
	Oleg Nesterov <oleg@...hat.com>
Subject: Re: Severe performance regression w/ 4.4+ on Android due to cgroup
 locking changes

On Wed, Jul 13, 2016 at 05:05:26PM -0400, Tejun Heo wrote:
> On Wed, Jul 13, 2016 at 02:03:15PM -0700, Paul E. McKenney wrote:
> > Take the patch that I just sent out and make the choice of normal
> > vs. expedited depend on CONFIG_PREEMPT_RT or whatever the -rt guys are
> > calling it these days.  Is there a low-latency Kconfig option other
> > than CONFIG_NO_HZ_FULL?
> 
> Sounds like a plan to me.

I like the way we like each other's idea.  Mutually assured laziness?  ;-)

							Thanx, Paul