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

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Message-ID: <20160713205712.GB30909@twins.programming.kicks-ass.net>
Date:	Wed, 13 Jul 2016 22:57:12 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Tejun Heo <tj@...nel.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 01:52:11PM -0700, Paul E. McKenney wrote:
> Not a particularly real-time-friendly fix, but certainly a good check
> on our various assumptions.

Not only RT, but also HPC and all the other RDMA userspace polling
freaks ;-)

But yes, it would confirm that this is indeed the issue.