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List: linaro-kernel
Subject: Re: [PATCH 7/7 v3] sched: fix wrong utilization accounting when switching to fair class
From: Peter Zijlstra <peterz () infradead ! org>
Date: 2016-09-26 14:53:54
Message-ID: 20160926145354.GL5020 () twins ! programming ! kicks-ass ! net
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On Thu, Sep 22, 2016 at 02:25:18PM +0200, Peter Zijlstra wrote:
> On Tue, Sep 20, 2016 at 03:06:04PM +0200, Vincent Guittot wrote:
> > > Also, even it things magically worked out, its still very icky to mix
> > > the normalized vruntime into things.
> >
> > I agree
>
> In any case, I pushed out a bunch of patches to:
>
> git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/tmp
>
> they appear to be able to build a kernel, but that's not much testing.
Hurmph, its buggered for cgroups. When we get the newidle lockbreak
between dequeue and put_prev_task, the load-balance pull can add a task
to the 'current' cgroup.
Which suggests we cannot do that enqueue_entity() optimization, unless
we fix that dequeue+put atomicy muck.
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