linux-kernel - Re: [PATCH v16 10/34] fs/resctrl: Introduce the interface to display monitoring modes

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Message-ID: <d23b35d5-497c-46ea-a8cc-c789f0aff3c9@intel.com>
Date: Wed, 6 Aug 2025 14:30:48 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: <babu.moger@....com>, <corbet@....net>, <tony.luck@...el.com>,
	<james.morse@....com>, <tglx@...utronix.de>, <mingo@...hat.com>,
	<bp@...en8.de>, <dave.hansen@...ux.intel.com>
CC: <Dave.Martin@....com>, <x86@...nel.org>, <hpa@...or.com>,
	<akpm@...ux-foundation.org>, <paulmck@...nel.org>, <rostedt@...dmis.org>,
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	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<peternewman@...gle.com>, <eranian@...gle.com>
Subject: Re: [PATCH v16 10/34] fs/resctrl: Introduce the interface to display
 monitoring modes

Hi Babu,

On 8/6/25 2:02 PM, Moger, Babu wrote:
> On 7/25/25 13:29, Babu Moger wrote:
>> diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
>> index ca0475b75390..c7ca9113a12a 100644
>> --- a/fs/resctrl/rdtgroup.c
>> +++ b/fs/resctrl/rdtgroup.c
>> @@ -1799,6 +1799,36 @@ static ssize_t mbm_local_bytes_config_write(struct kernfs_open_file *of,
>>  	return ret ?: nbytes;
>>  }
>>  
>> +static int resctrl_mbm_assign_mode_show(struct kernfs_open_file *of,
>> +					struct seq_file *s, void *v)
>> +{
>> +	struct rdt_resource *r = rdt_kn_parent_priv(of->kn);
>> +	bool enabled;
>> +
>> +	mutex_lock(&rdtgroup_mutex);
>> +	enabled = resctrl_arch_mbm_cntr_assign_enabled(r);
>> +
>> +	if (r->mon.mbm_cntr_assignable) {
>> +		if (enabled)
>> +			seq_puts(s, "[mbm_event]\n");
>> +		else
>> +			seq_puts(s, "[default]\n");
>> +
>> +		if (!IS_ENABLED(CONFIG_RESCTRL_ASSIGN_FIXED)) {
>> +			if (enabled)
>> +				seq_puts(s, "default\n");
>> +			else
>> +				seq_puts(s, "mbm_event\n");
>> +		}
>> +	} else {
>> +		seq_puts(s, "[default]\n");
>> +	}
>> +
>> +	mutex_unlock(&rdtgroup_mutex);
>> +
>> +	return 0;
>> +}
> 
> The resctrl_mbm_assign_mode_show() can also be moved to monitor.c.
> 
> What do you think?

I agree. monitor.c is appropriate for this code.

Reinette