Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1245455

Re: 4.3 group scheduling regression

From Yuyang Du <yuyang.du@intel.com>
Newsgroups linux.kernel
Subject Re: 4.3 group scheduling regression
Date 2015-10-13 10:30 +0200
Message-ID <qj386-Y7-13@gated-at.bofh.it> (permalink)
References (5 earlier) <qiIdl-488-13@gated-at.bofh.it> <qiIwG-4vm-25@gated-at.bofh.it> <qiYL8-2Uy-13@gated-at.bofh.it> <qj2OL-A2-37@gated-at.bofh.it> <qj2Yq-Lw-17@gated-at.bofh.it>
Organization linux.* mail to news gateway

Show all headers | View raw

On Tue, Oct 13, 2015 at 10:10:23AM +0200, Peter Zijlstra wrote:
> 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' :-)

Sure, in minutes, :)
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Re: CFS scheduler unfairly prefers pinned tasks Mike Galbraith <umgwanakikbuti@gmail.com> - 2015-10-06 04:50 +0200
  Re: CFS scheduler unfairly prefers pinned tasks paul.szabo@sydney.edu.au - 2015-10-06 12:10 +0200
    Re: CFS scheduler unfairly prefers pinned tasks Mike Galbraith <umgwanakikbuti@gmail.com> - 2015-10-06 14:20 +0200
      Re: CFS scheduler unfairly prefers pinned tasks paul.szabo@sydney.edu.au - 2015-10-06 22:50 +0200
        Re: CFS scheduler unfairly prefers pinned tasks Mike Galbraith <umgwanakikbuti@gmail.com> - 2015-10-07 03:30 +0200
  Re: CFS scheduler unfairly prefers pinned tasks Mike Galbraith <umgwanakikbuti@gmail.com> - 2015-10-08 10:30 +0200
    Re: CFS scheduler unfairly prefers pinned tasks paul.szabo@sydney.edu.au - 2015-10-08 13:00 +0200
      Re: CFS scheduler unfairly prefers pinned tasks Peter Zijlstra <peterz@infradead.org> - 2015-10-08 13:30 +0200
        [patch] sched: disable task group re-weighting on the desktop Mike Galbraith <umgwanakikbuti@gmail.com> - 2015-10-10 15:30 +0200
          Re: [patch] sched: disable task group re-weighting on the desktop Peter Zijlstra <peterz@infradead.org> - 2015-10-10 19:10 +0200
            Re: [patch] sched: disable task group re-weighting on the desktop Peter Zijlstra <peterz@infradead.org> - 2015-10-10 19:20 +0200
            Re: [patch] sched: disable task group re-weighting on the desktop Mike Galbraith <umgwanakikbuti@gmail.com> - 2015-10-11 04:30 +0200
              4.3 group scheduling regression Mike Galbraith <umgwanakikbuti@gmail.com> - 2015-10-11 19:50 +0200
                Re: 4.3 group scheduling regression Peter Zijlstra <peterz@infradead.org> - 2015-10-12 09:30 +0200
                Re: 4.3 group scheduling regression Mike Galbraith <umgwanakikbuti@gmail.com> - 2015-10-12 09:50 +0200
                Re: 4.3 group scheduling regression Peter Zijlstra <peterz@infradead.org> - 2015-10-12 10:10 +0200
                Re: 4.3 group scheduling regression Yuyang Du <yuyang.du@intel.com> - 2015-10-12 10:50 +0200
                Re: 4.3 group scheduling regression Peter Zijlstra <peterz@infradead.org> - 2015-10-12 11:20 +0200
                Re: 4.3 group scheduling regression Yuyang Du <yuyang.du@intel.com> - 2015-10-12 12:10 +0200
                Re: 4.3 group scheduling regression Mike Galbraith <umgwanakikbuti@gmail.com> - 2015-10-12 12:30 +0200
                Re: 4.3 group scheduling regression Yuyang Du <yuyang.du@intel.com> - 2015-10-13 05:50 +0200
                Re: 4.3 group scheduling regression Mike Galbraith <umgwanakikbuti@gmail.com> - 2015-10-13 06:10 +0200
                Re: 4.3 group scheduling regression Yuyang Du <yuyang.du@intel.com> - 2015-10-13 06:40 +0200
                Re: 4.3 group scheduling regression Peter Zijlstra <peterz@infradead.org> - 2015-10-13 10:10 +0200
                Re: 4.3 group scheduling regression Peter Zijlstra <peterz@infradead.org> - 2015-10-13 10:20 +0200
                Re: 4.3 group scheduling regression Yuyang Du <yuyang.du@intel.com> - 2015-10-13 10:30 +0200
                Re: 4.3 group scheduling regression Yuyang Du <yuyang.du@intel.com> - 2015-10-13 10:30 +0200
                Re: 4.3 group scheduling regression Peter Zijlstra <peterz@infradead.org> - 2015-10-12 13:50 +0200
                Re: 4.3 group scheduling regression Mike Galbraith <umgwanakikbuti@gmail.com> - 2015-10-13 04:30 +0200
                Re: 4.3 group scheduling regression Yuyang Du <yuyang.du@intel.com> - 2015-10-13 05:30 +0200
                Re: 4.3 group scheduling regression Peter Zijlstra <peterz@infradead.org> - 2015-10-13 10:10 +0200
                Re: 4.3 group scheduling regression Mike Galbraith <umgwanakikbuti@gmail.com> - 2015-10-12 10:50 +0200
          Re: [patch] sched: disable task group re-weighting on the desktop paul.szabo@sydney.edu.au - 2015-10-10 22:20 +0200
            Re: [patch] sched: disable task group re-weighting on the desktop Mike Galbraith <umgwanakikbuti@gmail.com> - 2015-10-11 04:40 +0200
              Re: [patch] sched: disable task group re-weighting on the desktop paul.szabo@sydney.edu.au - 2015-10-11 11:30 +0200
                Re: [patch] sched: disable task group re-weighting on the desktop Mike Galbraith <umgwanakikbuti@gmail.com> - 2015-10-11 15:00 +0200
          Re: [patch] sched: disable task group re-weighting on the desktop paul.szabo@sydney.edu.au - 2015-10-11 21:50 +0200
            Re: [patch] sched: disable task group re-weighting on the desktop Mike Galbraith <umgwanakikbuti@gmail.com> - 2015-10-12 04:00 +0200
      Re: CFS scheduler unfairly prefers pinned tasks Mike Galbraith <umgwanakikbuti@gmail.com> - 2015-10-08 16:30 +0200
        Re: CFS scheduler unfairly prefers pinned tasks paul.szabo@sydney.edu.au - 2015-10-09 00:00 +0200
          Re: CFS scheduler unfairly prefers pinned tasks Mike Galbraith <umgwanakikbuti@gmail.com> - 2015-10-09 04:00 +0200
          Re: CFS scheduler unfairly prefers pinned tasks Mike Galbraith <umgwanakikbuti@gmail.com> - 2015-10-09 04:50 +0200
            Re: CFS scheduler unfairly prefers pinned tasks paul.szabo@sydney.edu.au - 2015-10-11 11:50 +0200
    Re: CFS scheduler unfairly prefers pinned tasks Wanpeng Li <wanpeng.li@hotmail.com> - 2015-10-10 06:10 +0200
      Re: CFS scheduler unfairly prefers pinned tasks Wanpeng Li <wanpeng.li@hotmail.com> - 2015-10-10 10:00 +0200

csiph-web