linux-kernel - RE: [PATCH v8 04/13] x86/resctrl: Include new features in command line options

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Date:   Wed, 23 Nov 2022 23:10:39 +0000
From:   "Moger, Babu" <Babu.Moger@....com>
To:     "Yu, Fenghua" <fenghua.yu@...el.com>,
        "corbet@....net" <corbet@....net>,
        "Chatre, Reinette" <reinette.chatre@...el.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>
CC:     "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>, "hpa@...or.com" <hpa@...or.com>,
        "paulmck@...nel.org" <paulmck@...nel.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "quic_neeraju@...cinc.com" <quic_neeraju@...cinc.com>,
        "rdunlap@...radead.org" <rdunlap@...radead.org>,
        "damien.lemoal@...nsource.wdc.com" <damien.lemoal@...nsource.wdc.com>,
        "songmuchun@...edance.com" <songmuchun@...edance.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "jpoimboe@...nel.org" <jpoimboe@...nel.org>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "Bae, Chang Seok" <chang.seok.bae@...el.com>,
        "pawan.kumar.gupta@...ux.intel.com" 
        <pawan.kumar.gupta@...ux.intel.com>,
        "jmattson@...gle.com" <jmattson@...gle.com>,
        "daniel.sneddon@...ux.intel.com" <daniel.sneddon@...ux.intel.com>,
        "Das1, Sandipan" <Sandipan.Das@....com>,
        "Luck, Tony" <tony.luck@...el.com>,
        "james.morse@....com" <james.morse@....com>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "bagasdotme@...il.com" <bagasdotme@...il.com>,
        "Eranian, Stephane" <eranian@...gle.com>
Subject: RE: [PATCH v8 04/13] x86/resctrl: Include new features in command
 line options

[AMD Official Use Only - General]

Hi Fenghua,

> -----Original Message-----
> From: Yu, Fenghua <fenghua.yu@...el.com>
> Sent: Wednesday, November 23, 2022 12:26 PM
> To: Moger, Babu <Babu.Moger@....com>; corbet@....net; Chatre, Reinette
> <reinette.chatre@...el.com>; tglx@...utronix.de; mingo@...hat.com;
> bp@...en8.de
> Cc: 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; Bae, Chang Seok <chang.seok.bae@...el.com>;
> pawan.kumar.gupta@...ux.intel.com; jmattson@...gle.com;
> daniel.sneddon@...ux.intel.com; Das1, Sandipan <Sandipan.Das@....com>;
> Luck, Tony <tony.luck@...el.com>; james.morse@....com; linux-
> doc@...r.kernel.org; linux-kernel@...r.kernel.org; bagasdotme@...il.com;
> Eranian, Stephane <eranian@...gle.com>
> Subject: RE: [PATCH v8 04/13] x86/resctrl: Include new features in command
> line options
> 
> Hi, Babu,
> 
> > Add the command line options to disable the new features.
> s/disable/disable or enable/

Sure.
Thanks
Babu
> 
> > smba : Slow Memory Bandwidth Allocation bmec : Bandwidth Monitor Event
> > Configuration.
> >
> > Signed-off-by: Babu Moger <babu.moger@....com>
> > ---
> >  Documentation/admin-guide/kernel-parameters.txt |    2 +-
> >  arch/x86/kernel/cpu/resctrl/core.c              |    4 ++++
> >  2 files changed, 5 insertions(+), 1 deletion(-)
> >
> > diff --git a/Documentation/admin-guide/kernel-parameters.txt
> > b/Documentation/admin-guide/kernel-parameters.txt
> > index a465d5242774..f3f0870144fb 100644
> > --- a/Documentation/admin-guide/kernel-parameters.txt
> > +++ b/Documentation/admin-guide/kernel-parameters.txt
> > @@ -5190,7 +5190,7 @@
> >  	rdt=		[HW,X86,RDT]
> >  			Turn on/off individual RDT features. List is:
> >  			cmt, mbmtotal, mbmlocal, l3cat, l3cdp, l2cat, l2cdp,
> > -			mba.
> > +			mba, smba, bmec.
> >  			E.g. to turn on cmt and turn off mba use:
> >  				rdt=cmt,!mba
> >
> > diff --git a/arch/x86/kernel/cpu/resctrl/core.c
> > b/arch/x86/kernel/cpu/resctrl/core.c
> > index 4b970e7192e8..e31c98e2fafc 100644
> > --- a/arch/x86/kernel/cpu/resctrl/core.c
> > +++ b/arch/x86/kernel/cpu/resctrl/core.c
> > @@ -659,6 +659,8 @@ enum {
> >  	RDT_FLAG_L2_CAT,
> >  	RDT_FLAG_L2_CDP,
> >  	RDT_FLAG_MBA,
> > +	RDT_FLAG_SMBA,
> > +	RDT_FLAG_BMEC,
> >  };
> >
> >  #define RDT_OPT(idx, n, f)	\
> > @@ -682,6 +684,8 @@ static struct rdt_options rdt_options[]  __initdata = {
> >  	RDT_OPT(RDT_FLAG_L2_CAT,    "l2cat",	X86_FEATURE_CAT_L2),
> >  	RDT_OPT(RDT_FLAG_L2_CDP,    "l2cdp",
> 	X86_FEATURE_CDP_L2),
> >  	RDT_OPT(RDT_FLAG_MBA,	    "mba",	X86_FEATURE_MBA),
> > +	RDT_OPT(RDT_FLAG_SMBA,	    "smba",	X86_FEATURE_SMBA),
> > +	RDT_OPT(RDT_FLAG_BMEC,	    "bmec",	X86_FEATURE_BMEC),
> >  };
> >  #define NUM_RDT_OPTIONS ARRAY_SIZE(rdt_options)
> >
> >
> Thanks.
> 
> -Fenghua

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