linux-kernel - Re: [PATCH 3/4] sched: introduce synchronized idle injection

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Message-ID: <20151118090308.26917747@yairi>
Date:	Wed, 18 Nov 2015 09:03:08 -0800
From:	Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Morten Rasmussen <morten.rasmussen@....com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>, Ingo Molnar <mingo@...hat.com>,
	John Stultz <john.stultz@...aro.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	Len Brown <len.brown@...el.com>,
	Rafael Wysocki <rafael.j.wysocki@...el.com>,
	Eduardo Valentin <edubezval@...il.com>,
	Paul Turner <pjt@...gle.com>, jacob.jun.pan@...ux.intel.com
Subject: Re: [PATCH 3/4] sched: introduce synchronized idle injection

On Wed, 18 Nov 2015 16:21:27 +0100 (CET)
Thomas Gleixner <tglx@...utronix.de> wrote:

> >   
> > > Okay. But it does mean that the defeault idle period is 5 ticks
> > > (50ms @ HZ=100) and not 5 ms  
> > correct. my reason is to scale with various HZ values.  
> 
> So for smaller HZ values we get longer disruption. That's well thought
> out scaling.
well it might be too long for embedded systems who uses 100HZ. Is there
a better way to scale in sub tick level?

My original thought was for smaller HZ value, I assume they care less
about latency, so the idle injection period is proportional to what
they set for HZ.
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