linux-kernel - RE: [PATCH v9 02/13] x86/resctrl: Add a new resource type RDT_RESOURCE

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Message-ID: <MW3PR12MB45538C89FE8FA980FC5DBC4295E19@MW3PR12MB4553.namprd12.prod.outlook.com>
Date:   Thu, 15 Dec 2022 21:30:32 +0000
From:   "Moger, Babu" <Babu.Moger@....com>
To:     Reinette Chatre <reinette.chatre@...el.com>,
        "corbet@....net" <corbet@....net>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
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Subject: RE: [PATCH v9 02/13] x86/resctrl: Add a new resource type
 RDT_RESOURCE_SMBA

[AMD Official Use Only - General]

Hi Reinette,

> -----Original Message-----
> From: Reinette Chatre <reinette.chatre@...el.com>
> Sent: Thursday, December 15, 2022 11:11 AM
> To: Moger, Babu <Babu.Moger@....com>; corbet@....net;
> tglx@...utronix.de; mingo@...hat.com; bp@...en8.de
> Cc: fenghua.yu@...el.com; dave.hansen@...ux.intel.com; x86@...nel.org;
> hpa@...or.com; paulmck@...nel.org; akpm@...ux-foundation.org;
> quic_neeraju@...cinc.com; rdunlap@...radead.org;
> damien.lemoal@...nsource.wdc.com; songmuchun@...edance.com;
> peterz@...radead.org; jpoimboe@...nel.org; pbonzini@...hat.com;
> chang.seok.bae@...el.com; pawan.kumar.gupta@...ux.intel.com;
> jmattson@...gle.com; daniel.sneddon@...ux.intel.com; Das1, Sandipan
> <Sandipan.Das@....com>; tony.luck@...el.com; james.morse@....com;
> linux-doc@...r.kernel.org; linux-kernel@...r.kernel.org;
> bagasdotme@...il.com; eranian@...gle.com; christophe.leroy@...roup.eu;
> jarkko@...nel.org; adrian.hunter@...el.com; quic_jiles@...cinc.com;
> peternewman@...gle.com
> Subject: Re: [PATCH v9 02/13] x86/resctrl: Add a new resource type
> RDT_RESOURCE_SMBA
> 
> Hi Babu,
> 
> On 12/1/2022 7:36 AM, Babu Moger wrote:
> > Add a new resource type RDT_RESOURCE_SMBA to handle the QoS
> > enforcement policies on the external slow memory.
> >
> 
> I think a snippet like below may help to set reviewer's mind at ease about the
> consequences of values chosen:
> 
> "Mostly initialization of the essentials. Setting fflags to RFTYPE_RES_MB
> configures the SMBA resource to have the same resctrl files as the existing
> MBA resource. The SMBA resource has identical properties to the existing MBA
> resource. These properties will be enumerated in an upcoming change and
> exposed via resctrl because of this flag."

Sure. Will add it.
> 
> > Signed-off-by: Babu Moger <babu.moger@....com>
> > ---
> >  arch/x86/kernel/cpu/resctrl/core.c     |   12 ++++++++++++
> >  arch/x86/kernel/cpu/resctrl/internal.h |    1 +
> >  2 files changed, 13 insertions(+)
> >
> > diff --git a/arch/x86/kernel/cpu/resctrl/core.c
> > b/arch/x86/kernel/cpu/resctrl/core.c
> > index c98e52ff5f20..f6af3ac1ef20 100644
> > --- a/arch/x86/kernel/cpu/resctrl/core.c
> > +++ b/arch/x86/kernel/cpu/resctrl/core.c
> > @@ -100,6 +100,18 @@ struct rdt_hw_resource rdt_resources_all[] = {
> >  			.fflags			= RFTYPE_RES_MB,
> >  		},
> >  	},
> > +	[RDT_RESOURCE_SMBA] =
> > +	{
> > +		.r_resctrl = {
> > +			.rid			= RDT_RESOURCE_SMBA,
> > +			.name			= "SMBA",
> > +			.cache_level		= 3,
> > +			.domains		=
> domain_init(RDT_RESOURCE_SMBA),
> > +			.parse_ctrlval		= parse_bw,
> > +			.format_str		= "%d=%*u",
> > +			.fflags			= RFTYPE_RES_MB,
> > +		},
> > +	},
> >  };
> >
> >  /*
> > diff --git a/arch/x86/kernel/cpu/resctrl/internal.h
> > b/arch/x86/kernel/cpu/resctrl/internal.h
> > index 5ebd28e6aa0c..fdbbf66312ec 100644
> > --- a/arch/x86/kernel/cpu/resctrl/internal.h
> > +++ b/arch/x86/kernel/cpu/resctrl/internal.h
> > @@ -409,6 +409,7 @@ enum resctrl_res_level {
> >  	RDT_RESOURCE_L3,
> >  	RDT_RESOURCE_L2,
> >  	RDT_RESOURCE_MBA,
> > +	RDT_RESOURCE_SMBA,
> >
> >  	/* Must be the last */
> >  	RDT_NUM_RESOURCES,
> >
> >
> 
> Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>

Thanks
Babu
> 
> Reinette