linux-kernel - Re: [PATCH v9 04/13] x86/resctrl: Include new features in command line options

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Date:   Thu, 15 Dec 2022 09:12:02 -0800
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     Babu Moger <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>,
        <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 04/13] x86/resctrl: Include new features in command
 line options

Hi Babu,

On 12/1/2022 7:36 AM, Babu Moger wrote:
> Add the command line options to enable or disable the new resctrl features.
> 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 42af9ca0127e..a7b6634f4426 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 f6af3ac1ef20..10a8c9d96f32 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)
>  
> 
> 

Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>

Reinette