On Tue, 12 May 2020 13:30:27 +0000 Elana Copperman <Elana.Copperman@xxxxxxxxxxxx> wrote: > Hi, can you help to clarify if there is any implementation support or > evidence on configuring cgroups CPU time allocations for RT tasks in > conjunction with the PREEMPT_RT patch? What exactly are you trying to do with cgroups CPU time allocations, and what is the problem you are seeing with the PREEMPT_RT patch with them? I'm assuming you are using the 5.6-rt kernel. -- Steve > > Or are the two requirements contradictory in essence and not jointly > feasible? > > Thanks > > Elana and Vladimir > > > > > From: Elana Copperman > > Sent: Thursday, May 7, 2020 10:08 PM > > To: linux-rt-users <linux-rt-users@xxxxxxxxxxxxxxx>; Vladimir Kondratiev > (Mobileye) > <63dc4b5d-c467-4bfb-bce5-74485907c850@xxxxxxxxxxxxxxxxxxxxxxxxxx> > > Subject: RE: cgroups CPU time management + PREEMPT_RT > > > > > Hi, > > We are new to the mailing list, and new to PREEMPT_RT. > > We are working on a project with a safety requirement to configure > cgroups for resource management, as well as functional requirement for > deployment of PREEMPT_RT patch. > > cgroups in general can be used in this context, in particular for > managing resources such as memory; and even for managing CPU time for > non-RT tasks. > > > However, we do see a potential problem with RT tasks, and how the CPU > controller would work with the RT scheduling. > > There is some obvious concern here, and this seems to be backed by what I > find online regarding this question. > > > > Can you help us to clarify what is the current state of implementation, > and if there is any support for cgroup CPU controller configuration to > work effectively with PREEMPT_RT for RT tasks? > > > Thanks > > Elana > > > > >
