On Tue, Oct 23, 2012 at 3:45 PM, Michal Hocko <mhocko@xxxxxxx> wrote: > On Tue 23-10-12 18:10:33, Qiang Gao wrote: >> On Tue, Oct 23, 2012 at 5:50 PM, Michal Hocko <mhocko@xxxxxxx> wrote: >> > On Tue 23-10-12 15:18:48, Qiang Gao wrote: >> >> This process was moved to RT-priority queue when global oom-killer >> >> happened to boost the recovery of the system.. >> > >> > Who did that? oom killer doesn't boost the priority (scheduling class) >> > AFAIK. >> > >> >> but it wasn't get properily dealt with. I still have no idea why where >> >> the problem is .. >> > >> > Well your configuration says that there is no runtime reserved for the >> > group. >> > Please refer to Documentation/scheduler/sched-rt-group.txt for more >> > information. >> > > [...] >> maybe this is not a upstream-kernel bug. the centos/redhat kernel >> would boost the process to RT prio when the process was selected >> by oom-killer. > > This still looks like your cpu controller is misconfigured. Even if the > task is promoted to be realtime. Precisely! You need to have rt bandwidth enabled for RT tasks to run, as a workaround please give the groups some RT bandwidth and then work out the migration to RT and what should be the defaults on the distro. Balbir -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>