From: Yuyang Du <yuyang.du@intel.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Mike Galbraith <umgwanakikbuti@gmail.com>, linux-kernel@vger.kernel.org
Subject: Re: 4.3 group scheduling regression
Date: Tue, 13 Oct 2015 08:37:13 +0800 [thread overview]
Message-ID: <20151013003713.GP11102@intel.com> (raw)
In-Reply-To: <20151013081023.GO11639@twins.programming.kicks-ass.net>
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, :)
next prev parent reply other threads:[~2015-10-13 8:25 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-05 21:48 CFS scheduler unfairly prefers pinned tasks paul.szabo
2015-10-06 2:45 ` Mike Galbraith
2015-10-06 10:06 ` paul.szabo
2015-10-06 12:17 ` Mike Galbraith
2015-10-06 20:44 ` paul.szabo
2015-10-07 1:28 ` Mike Galbraith
2015-10-08 8:19 ` Mike Galbraith
2015-10-08 10:54 ` paul.szabo
2015-10-08 11:19 ` Peter Zijlstra
2015-10-10 13:22 ` [patch] sched: disable task group re-weighting on the desktop Mike Galbraith
2015-10-10 14:03 ` kbuild test robot
2015-10-10 14:41 ` Mike Galbraith
2015-10-10 17:01 ` Peter Zijlstra
2015-10-10 17:13 ` Peter Zijlstra
2015-10-11 2:25 ` Mike Galbraith
2015-10-11 17:42 ` 4.3 group scheduling regression Mike Galbraith
2015-10-12 7:23 ` Peter Zijlstra
2015-10-12 7:44 ` Mike Galbraith
2015-10-12 8:04 ` Peter Zijlstra
2015-10-12 0:53 ` Yuyang Du
2015-10-12 9:12 ` Peter Zijlstra
2015-10-12 2:12 ` Yuyang Du
2015-10-12 10:23 ` Mike Galbraith
2015-10-12 19:55 ` Yuyang Du
2015-10-13 4:08 ` Mike Galbraith
2015-10-12 20:42 ` Yuyang Du
2015-10-13 8:06 ` Peter Zijlstra
2015-10-13 0:35 ` Yuyang Du
2015-10-13 8:10 ` Peter Zijlstra
2015-10-13 0:37 ` Yuyang Du [this message]
2015-10-12 11:47 ` Peter Zijlstra
2015-10-12 19:32 ` Yuyang Du
2015-10-13 8:07 ` Peter Zijlstra
2015-10-13 2:22 ` Mike Galbraith
2015-10-12 8:48 ` Mike Galbraith
2015-10-10 20:14 ` [patch] sched: disable task group re-weighting on the desktop paul.szabo
2015-10-11 2:38 ` Mike Galbraith
2015-10-11 9:25 ` paul.szabo
2015-10-11 12:49 ` Mike Galbraith
2015-10-11 19:46 ` paul.szabo
2015-10-12 1:59 ` Mike Galbraith
2015-10-08 14:25 ` CFS scheduler unfairly prefers pinned tasks Mike Galbraith
2015-10-08 21:55 ` paul.szabo
2015-10-09 1:56 ` Mike Galbraith
2015-10-09 2:40 ` Mike Galbraith
2015-10-11 9:43 ` paul.szabo
2015-10-10 3:59 ` Wanpeng Li
2015-10-10 7:58 ` Wanpeng Li
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