linux-kernel - Re: [PATCH v10 09/10] x86/resctrl: Add support for the files for MON groups only

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Message-ID: <b0c837f8-de37-f25d-6e0-8bfc1fa894ae@linux.intel.com>
Date:   Fri, 29 Sep 2023 18:59:35 +0300 (EEST)
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     Babu Moger <babu.moger@....com>
cc:     corbet@....net, Reinette Chatre <reinette.chatre@...el.com>,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        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, LKML <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 v10 09/10] x86/resctrl: Add support for the files for
 MON groups only

On Fri, 15 Sep 2023, Babu Moger wrote:

> There are 3 types resctrl root files.
> 1. RFTYPE_BASE : Files common for both MON and CTRL groups
> 2. RFTYPE_BASE | RFTYPE_CTRL : Files only for CTRL groups
> 3. RFTYPE_BASE | RFTYPE_MON : Files only for MON groups
> 
> Files only for the MON groups are not supported now. Add the
> support to create these files.
> 
> Signed-off-by: Babu Moger <babu.moger@....com>
> ---
>  arch/x86/kernel/cpu/resctrl/rdtgroup.c | 15 +++++++++++----
>  1 file changed, 11 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> index 953b082cec8a..55d1b90f460e 100644
> --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> @@ -2533,6 +2533,7 @@ static void schemata_list_destroy(void)
>  static int rdt_get_tree(struct fs_context *fc)
>  {
>  	struct rdt_fs_context *ctx = rdt_fc2context(fc);
> +	unsigned long flags = RFTYPE_CTRL_BASE;
>  	struct rdt_domain *dom;
>  	struct rdt_resource *r;
>  	int ret;
> @@ -2563,7 +2564,10 @@ static int rdt_get_tree(struct fs_context *fc)
>  
>  	closid_init();
>  
> -	ret = rdtgroup_add_files(rdtgroup_default.kn, RFTYPE_CTRL_BASE);
> +	if (rdt_mon_capable)
> +		flags |= RFTYPE_MON;
> +
> +	ret = rdtgroup_add_files(rdtgroup_default.kn, flags);
>  	if (ret)
>  		goto out_schemata_free;
>  
> @@ -3253,8 +3257,8 @@ static int mkdir_rdt_prepare(struct kernfs_node *parent_kn,
>  			     enum rdt_group_type rtype, struct rdtgroup **r)
>  {
>  	struct rdtgroup *prdtgrp, *rdtgrp;
> +	unsigned long files = 0;
>  	struct kernfs_node *kn;
> -	uint files = 0;
>  	int ret;
>  
>  	prdtgrp = rdtgroup_kn_lock_live(parent_kn);
> @@ -3306,10 +3310,13 @@ static int mkdir_rdt_prepare(struct kernfs_node *parent_kn,
>  		goto out_destroy;
>  	}
>  
> -	if (rtype == RDTCTRL_GROUP)
> +	if (rtype == RDTCTRL_GROUP) {
>  		files = RFTYPE_BASE | RFTYPE_CTRL;
> -	else
> +		if (rdt_mon_capable)
> +			files |= RFTYPE_MON;
> +	} else {
>  		files = RFTYPE_BASE | RFTYPE_MON;
> +	}
>  
>  	ret = rdtgroup_add_files(kn, files);
>  	if (ret) {
> 

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>

-- 
 i.