linux-kernel - Re: [v9 PATCH 4/9]: x86: refactor x86 idle power management code and remove all instances of pm

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Message-ID: <20091023160711.GB1431@ucw.cz>
Date:	Fri, 23 Oct 2009 18:07:11 +0200
From:	Pavel Machek <pavel@....cz>
To:	Arun R Bharadwaj <arun@...ux.vnet.ibm.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ingo Molnar <mingo@...e.hu>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Balbir Singh <balbir@...ibm.com>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, linux-arch@...r.kernel.org,
	linux-acpi@...r.kernel.org
Subject: Re: [v9 PATCH 4/9]: x86: refactor x86 idle power management code
	and remove all instances of pm_idle.

On Fri 2009-10-16 15:13:08, Arun R Bharadwaj wrote:
> * Arun R Bharadwaj <arun@...ux.vnet.ibm.com> [2009-10-16 15:08:50]:
> 
> This patch cleans up x86 of all instances of pm_idle.
> 
> pm_idle which was earlier called from cpu_idle() idle loop
> is replaced by cpuidle_idle_call.
> 
> x86 also registers to cpuidle when the idle routine is selected,
> by populating the cpuidle_device data structure for each cpu.
> 
> This is replicated for apm module and for xen, which also used pm_idle.
> 
> 
> Signed-off-by: Arun R Bharadwaj <arun@...ux.vnet.ibm.com>
> ---
>  arch/x86/kernel/apm_32.c      |   55 ++++++++++++++++++++++++-
>  arch/x86/kernel/process.c     |   90 ++++++++++++++++++++++++++++++++----------
>  arch/x86/kernel/process_32.c  |    3 -
>  arch/x86/kernel/process_64.c  |    3 -
>  arch/x86/xen/setup.c          |   40 ++++++++++++++++++
>  drivers/acpi/processor_core.c |    9 ++--
>  drivers/cpuidle/cpuidle.c     |   16 +++++--
>  7 files changed, 182 insertions(+), 34 deletions(-)
...
> +static int local_idle_loop(struct cpuidle_device *dev, struct cpuidle_state *st)
> +{
> +	ktime_t t1, t2;
> +	s64 diff;
> +	int ret;
> +
> +	t1 = ktime_get();
> +	local_idle();
> +	t2 = ktime_get();
> +
> +	diff = ktime_to_us(ktime_sub(t2, t1));
> +	if (diff > INT_MAX)
> +		diff = INT_MAX;
> +	ret = (int) diff;
> +
> +	return ret;
> +}

So we get this routine essentially 3 times. Is there no way to share
the code?

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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