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

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Message-ID: <20140212173758.GF28661@e102568-lin.cambridge.arm.com>
Date:	Wed, 12 Feb 2014 17:37:59 +0000
From:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:	Arjan van de Ven <arjan@...ux.intel.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Morten Rasmussen <Morten.Rasmussen@....com>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	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, 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.

Thanks,
Lorenzo

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