Re: [PATCH v8 7/8] sched/core: Prevent race condition between cpuset and __sched_setscheduler()

[Juri Lelli]

On 01/07/19 21:11, Peter Zijlstra wrote:
> On Fri, Jun 28, 2019 at 10:06:17AM +0200, Juri Lelli wrote:
> > No synchronisation mechanism exists between the cpuset subsystem and
> > calls to function __sched_setscheduler(). As such, it is possible that
> > new root domains are created on the cpuset side while a deadline
> > acceptance test is carried out in __sched_setscheduler(), leading to a
> > potential oversell of CPU bandwidth.
> > 
> > Grab cpuset_rwsem read lock from core scheduler, so to prevent
> > situations such as the one described above from happening.
> > 
> 
> ISTR there being a funny vs normalize_rt_tasks(); maybe mention that?

Yep. I'll add a comment about it.