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

[Peter Zijlstra]

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.