linux-kernel - Re: [PATCH 2/3] introduce intel

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Date:	Mon, 30 May 2011 10:40:31 +0800
From:	Zhang Rui <rui.zhang@...el.com>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	linux-pm <linux-pm@...ts.linux-foundation.org>,
	"a.p.zijlstra@...llo.nl" <a.p.zijlstra@...llo.nl>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"acme@...hat.com" <acme@...hat.com>,
	"Lin, Ming M" <ming.m.lin@...el.com>,
	"Brown, Len" <lenb@...nel.org>
Subject: Re: [PATCH 2/3] introduce intel_rapl driver

Hi,

On Thu, 2011-05-26 at 23:48 +0800, Randy Dunlap wrote:
> On Thu, 26 May 2011 16:34:17 +0800 Zhang Rui wrote:
> 
> > 
> > Introduce Intel RAPL driver.
> > 
> > RAPL (running average power limit) is a new feature which provides mechanisms
> > to enforce power consumption limit, on some new processors.
> > 
> > RAPL provides MSRs reporting the total amount of energy consumed
> > by the package/core/uncore/dram.
> > Further more, by using RAPL, OS can set a power bugdet in a certain time window,
> > and let Hardware to throttle the processor P/T-state to meet this enery limitation.
> > 
> > Currently, we don't have the plan to support the RAPL power control,
> > but we do want to export the package/core/uncore/dram power consumption
> > information via perf tool first.
> 
> Hi,
> 
> What's an uncore?
> 
According to the Intel SDM, besides the Package and DRAM power domains,
RAPL defines another two power domains, AKA, PP0/PP1, PP0 refers to the
processor cores and PP1 refers to the power plane of a specific device
in the uncore.
Maybe "uncore" is kind of misleading, but using "PP0/PP1" doesn't mean
anything to users.

> > Signed-off-by: Zhang Rui <rui.zhang@...el.com>
> > ---
> >  drivers/platform/x86/Kconfig      |    8 
> >  drivers/platform/x86/Makefile     |    1 
> >  drivers/platform/x86/intel_rapl.c |  368 ++++++++++++++++++++++++++++++++++++++
> >  include/linux/perf_event.h        |    4 
> >  4 files changed, 381 insertions(+)
> > 
> > Index: linux-2.6/drivers/platform/x86/Kconfig
> > ===================================================================
> > --- linux-2.6.orig/drivers/platform/x86/Kconfig
> > +++ linux-2.6/drivers/platform/x86/Kconfig
> > @@ -753,4 +753,12 @@ config SAMSUNG_LAPTOP
> >  	  To compile this driver as a module, choose M here: the module
> >  	  will be called samsung-laptop.
> >  
> > +config INTEL_RAPL
> > +	tristate "Intel RAPL Support"
> > +	depends on X86
> > +	default y
> > +	---help---
> > +	  RAPL, AKA, Running Average Power Limit provides mechanisms to enforce
> 
> 	  RAPL (Running Average Power Limit) provides mechanisms to enforce
> 
> > +	  power consumption limit.
> > +
> >  endif # X86_PLATFORM_DEVICES
> 
> > Index: linux-2.6/drivers/platform/x86/intel_rapl.c
> > ===================================================================
> > --- /dev/null
> > +++ linux-2.6/drivers/platform/x86/intel_rapl.c
> > @@ -0,0 +1,368 @@
> 
> [snip]
> 
> > +/* show the energy status, in Jelous */
> 
> Is that Joules?  or what?
> 
Oh. right, it's Joules.

> > +static int rapl_read_energy(struct rapl_domain *domain)
> > +{
> > +	u64 value;
> > +	u32 msr = domain->msrs.status;
> > +
> > +	rdmsrl(msr, value);
> > +	return rapl_unit_xlate(ENERGY_UNIT, value, 0);
> > +}
> 
> [snip]
> 
> > +static int __init intel_rapl_init(void)
> > +{
> > +	enum rapl_domain_id id;
> > +
> > +	/*
> > +	 * RAPL features are only supported on processors have a CPUID
> > +	 * signature with DisplayFamily_DisplayModel of 06_2AH, 06_2DH
> > +	 */
> > +	if (boot_cpu_data.x86 != 0x06)
> > +		return -ENODEV;
> > +
> > +	if (boot_cpu_data.x86_model == 0x2A)
> > +		rapl_domains[RAPL_DOMAIN_PP1].valid = 1;
> > +	else if (boot_cpu_data.x86_model == 0x2D)
> > +		rapl_domains[RAPL_DOMAIN_DRAM].valid = 1;
> > +	else
> > +		return -ENODEV;
> > +
> > +	if (rapl_check_unit())
> > +		return -ENODEV;
> > +
> > +	for(id = 0; id < RAPL_DOMAIN_MAX; id++)
> 
> space after "for"
> 
> > +		if (rapl_domains[id].valid)
> > +			perf_pmu_register(&(rapl_domains[id].pmu), rapl_domains[id].pmu.name, PERF_TYPE_SOFTWARE);
> > +	return 0;
> > +}
> > +
> > +static void __exit intel_rapl_exit(void)
> > +{
> > +	enum rapl_domain_id id;
> > +
> > +	for(id = 0; id < RAPL_DOMAIN_MAX; id++)
> 
> ditto
> 
will fix them in the next version.

thanks,
rui

> > +		if (rapl_domains[id].valid)
> > +			perf_pmu_unregister(&(rapl_domains[id].pmu));
> > +}
> 
> 
> ---
> ~Randy
> *** Remember to use Documentation/SubmitChecklist when testing your code ***


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