linux-kernel - Re: [RFC PATCH 3/3] idle: store the idle state index in the struct rq

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Message-ID: <alpine.LFD.2.11.1402121404280.17677@knanqh.ubzr>
Date:	Wed, 12 Feb 2014 14:05:13 -0500 (EST)
From:	Nicolas Pitre <nicolas.pitre@...aro.org>
To:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
cc:	Arjan van de Ven <arjan@...ux.intel.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Morten Rasmussen <Morten.Rasmussen@....com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Len Brown <len.brown@...el.com>,
	Preeti Murthy <preeti.lkml@...il.com>,
	"mingo@...hat.com" <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Lists linaro-kernel <linaro-kernel@...ts.linaro.org>
Subject: Re: [RFC PATCH 3/3] idle: store the idle state index in the struct
 rq

On Wed, 12 Feb 2014, Lorenzo Pieralisi wrote:

> On Wed, Feb 12, 2014 at 04:14:38PM +0000, Arjan van de Ven wrote:
> > 
> > >> sched_cpu_cache_wiped(int llc)
> > >>
> > >> that would be very nice for this; the menuidle side knows this
> > >> for some cases and thus can just call it. This would be a very
> > >> small and minimal change
> > >
> > > What do you mean by "menuidle side knows this for some cases" ?
> > > You mean you know that some C-state entries imply llc clean/invalidate ?
> > 
> > in the architectural idle code we can know if the llc got flushed
> > there's also the per core flags where we know with reasonable certainty
> > that the per core caches got flushed.
> 
> Ok, but that's arch specific, not something we can detect from the menu
> governor in generic code , that's what I wanted to ask because it was not
> clear.

I would think this is meant to be called from architecture specific 
backend code.


Nicolas
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