On Tue, Jul 07, 2015 at 07:24:19PM +0100, Morten Rasmussen wrote: > Scenarios with the busiest group having just one task and the local > being idle on topologies with sched groups with different numbers of > cpus manage to dodge all load-balance bailout conditions resulting the > nr_balance_failed counter to be incremented. This eventually causes an > pointless active migration of the task. This patch prevents this by not > incrementing the counter when the busiest group only has one task. > ASYM_PACKING migrations and migrations due to reduced capacity should > still take place as these are explicitly captured by > need_active_balance(). > > A better solution would be to not attempt the load-balance in the first > place, but that requires significant changes to the order of bailout > conditions and statistics gathering.
*groan*, and this is of course triggered by your 2+3 core TC2 thingy. Yes, asymmetric groups like that are a pain. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
