Re: [PATCH] android: binder: Disable preemption while holding the global binder lock

[Peter Zijlstra]

On Mon, Sep 12, 2016 at 08:44:09PM -0700, Arve Hjønnevåg wrote:

> A previous attempt to fix this problem, changed the lock to use
> rt_mutex instead of mutex, but this apparently did not work as well as
> this patch. I believe the added overhead was noticeable, and it did
> not work when the preempted thread was in a different cgroup (I don't
> know if this is still the case).

Do you actually have RR/FIFO/DL tasks? Currently PI isn't
defined/implemented for OTHER.

cgroups should be irrelevant, PI is unaware of them.