linux-kernel - Re: [PATCH v7 09/24] x86/resctrl: Introduce bitmap mbm_cntr_free

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Message-ID: <CALPaoChn+dkHNTMdCwCqH=zwtBr9jJRV4jAGWeWnNOBZ1f+6WQ@mail.gmail.com>
Date: Tue, 24 Sep 2024 09:25:05 -0700
From: Peter Newman <peternewman@...gle.com>
To: Babu Moger <babu.moger@....com>
Cc: corbet@....net, fenghua.yu@...el.com, reinette.chatre@...el.com, 
	tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, 
	dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com, 
	paulmck@...nel.org, rdunlap@...radead.org, tj@...nel.org, 
	peterz@...radead.org, yanjiewtw@...il.com, kim.phillips@....com, 
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	maciej.wieczor-retman@...el.com, linux-doc@...r.kernel.org, 
	linux-kernel@...r.kernel.org, eranian@...gle.com, james.morse@....com
Subject: Re: [PATCH v7 09/24] x86/resctrl: Introduce bitmap mbm_cntr_free_map
 to track assignable counters

Hi Babu,

On Wed, Sep 4, 2024 at 3:23 PM Babu Moger <babu.moger@....com> wrote:

> diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
> index f11d6fdfd977..aab22ff8e0c1 100644
> --- a/include/linux/resctrl.h
> +++ b/include/linux/resctrl.h
> @@ -187,12 +187,14 @@ enum resctrl_scope {
>   * @num_rmid:          Number of RMIDs available
>   * @num_mbm_cntrs:     Number of assignable monitoring counters
>   * @mbm_cntr_assignable:Is system capable of supporting monitor assignment?
> + * @mbm_cntr_free_map: bitmap of number of assignable MBM counters
>   * @evt_list:          List of monitoring events
>   */
>  struct resctrl_mon {
>         int                     num_rmid;
>         int                     num_mbm_cntrs;
>         bool                    mbm_cntr_assignable;
> +       unsigned long           *mbm_cntr_free_map;
>         struct list_head        evt_list;
>  };

This looks global still. Will only all-domain (*=) operations be
supported initially?

Thanks,
-Peter