On Tue, Oct 13, 2015 at 03:55:17AM +0800, Yuyang Du wrote: > I think maybe the real disease is the tg->load_avg is not updated in time. > I.e., it is after migrate, the source cfs_rq does not decrease its > contribution > to the parent's tg->load_avg fast enough.
No, using the load_avg for shares calculation seems wrong; that would mean we'd first have to ramp up the avg before you react. You want to react quickly to actual load changes, esp. going up. We use the avg to guess the global group load, since that's the best compromise we have, but locally it doesn't make sense to use the avg if we have the actual values. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
