linux-kernel - Re: [PATCH v16 11/34] fs/resctrl: Add resctrl file to display number of assignable counters

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Message-ID: <36b10063-e936-443b-bb4d-d0cffa66bae3@intel.com>
Date: Wed, 6 Aug 2025 14:31:00 -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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	<fvdl@...gle.com>, <seanjc@...gle.com>, <jpoimboe@...nel.org>,
	<pawan.kumar.gupta@...ux.intel.com>, <xin@...or.com>,
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	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<peternewman@...gle.com>, <eranian@...gle.com>
Subject: Re: [PATCH v16 11/34] fs/resctrl: Add resctrl file to display number
 of assignable counters

Hi Babu,

On 8/6/25 2:12 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 c7ca9113a12a..acbda73a9b9d 100644
>> --- a/fs/resctrl/rdtgroup.c
>> +++ b/fs/resctrl/rdtgroup.c
>> @@ -1829,6 +1829,30 @@ static int resctrl_mbm_assign_mode_show(struct kernfs_open_file *of,
>>  	return 0;
>>  }
>>  
>> +static int resctrl_num_mbm_cntrs_show(struct kernfs_open_file *of,
>> +				      struct seq_file *s, void *v)
>> +{
>> +	struct rdt_resource *r = rdt_kn_parent_priv(of->kn);
>> +	struct rdt_mon_domain *dom;
>> +	bool sep = false;
>> +
>> +	cpus_read_lock();
>> +	mutex_lock(&rdtgroup_mutex);
>> +
>> +	list_for_each_entry(dom, &r->mon_domains, hdr.list) {
>> +		if (sep)
>> +			seq_putc(s, ';');
>> +
>> +		seq_printf(s, "%d=%d", dom->hdr.id, r->mon.num_mbm_cntrs);
>> +		sep = true;
>> +	}
>> +	seq_putc(s, '\n');
>> +
>> +	mutex_unlock(&rdtgroup_mutex);
>> +	cpus_read_unlock();
>> +	return 0;
>> +}
> 
> How about moving this also to monitor.c?

Yes, this sounds good to me. This is what I had in mind when suggesting in [1]
that the monitoring related handlers should be located in monitor.c

Reinette

[1] https://lore.kernel.org/lkml/0fa9a12b-e900-4ceb-b59c-e653ec3db0ca@intel.com/