Messages in this thread | | | Date | Tue, 13 Oct 2015 10:10:23 +0200 | From | Peter Zijlstra <> | Subject | Re: 4.3 group scheduling regression |
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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' :-)
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