On Tue, Oct 13, 2015 at 10:06:48AM +0200, Peter Zijlstra wrote: > 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.
That is, can you send the original patch with a Changelog etc.. so that I can press 'A' :-) -- 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/
