linux-kernel - Re: [RFC PATCH 03/10] arch/x86: Re-arrange RDT init code

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Date:   Wed, 3 Oct 2018 20:12:31 +0000
From:   "Moger, Babu" <Babu.Moger@....com>
To:     Reinette Chatre <reinette.chatre@...el.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "hpa@...or.com" <hpa@...or.com>,
        "fenghua.yu@...el.com" <fenghua.yu@...el.com>,
        "vikas.shivappa@...ux.intel.com" <vikas.shivappa@...ux.intel.com>,
        "tony.luck@...el.com" <tony.luck@...el.com>
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Subject: Re: [RFC PATCH 03/10] arch/x86: Re-arrange RDT init code



On 10/03/2018 01:54 PM, Reinette Chatre wrote:
> Hi Babu,
> 
> On 10/2/2018 4:41 PM, Moger, Babu wrote:
>> On 10/02/2018 02:21 PM, Reinette Chatre wrote:
>>> On 9/24/2018 12:19 PM, Moger, Babu wrote:
>>>>  static enum cpuhp_state rdt_online;
>>>> @@ -866,8 +872,22 @@ static int __init rdt_late_init(void)
>>>>  	struct rdt_resource *r;
>>>>  	int state, ret;
>>>>  
>>>> -	if (!get_rdt_resources())
>>>> +	/* Run quirks first */
>>>> +	rdt_quirks();
>>>> +
>>>> +	rdt_alloc_capable = get_rdt_alloc_resources();
>>>> +	rdt_mon_capable = get_rdt_mon_resources();
>>>> +
>>>> +	if (!(rdt_alloc_capable || rdt_mon_capable)) {
>>>> +		pr_info("RDT allocation or monitoring not detected\n");
>>>
>>> This function ends with a log entry for every resource discovered. Is
>>> this new log entry needed to indicate that such resources have not been
>>> found? Could it not just be the absence of the other message?
>>
>> As this is relatively new feature, so I added this info message. It helped
>> me debug what went wrong. Otherwise, I don't see anything. I can remove it
>> if the message is too annoying to the user.
> 
> This log entry is made after detection of resources/features supported
> by the system. A user would find more information in the
> presence/absence of the relevant CPU feature flags in /proc/cpuinfo.

Ok. Understood. I have dropped this log entry.

> 
> Reinette
>