linux-kernel - Re: your mail

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Date:   Wed, 16 Nov 2016 15:28:21 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Christoph Lameter <cl@...ux.com>, Daniel Vacek <neelx.g@...il.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Tommaso Cucinotta <tommaso.cucinotta@...up.it>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>
Subject: Re: your mail

On Wed, Nov 16, 2016 at 09:25:43AM -0500, Steven Rostedt wrote:
> On Wed, 16 Nov 2016 11:40:14 +0100
> Peter Zijlstra <peterz@...radead.org> wrote:
> 
> 
> > On top of which, the implementation had issues; now I know you're the
> > blinder kind of person that disregards everything not in his immediate
> > interest, but if you'd looked at the patch you'd have seen he'd added
> > code the idle entry path, which will slow down every single to-idle
> > transition.
> 
> Isn't to-idle a bit bloated anyway? Or has that been fixed. I know
> there was some issues with idle_balance() which can add latency to
> wakeups. idle_balance() is also in the to-idle path.
> 

Yes it is too heavy as is, but just stacking more crap in just because
its already expensive seems to wrong way around.