linux-kernel - Re: [PATCH v4 08/13] arch/x86: Bring few more functions into the resource structure

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Message-ID: <bcfe2e44-4595-2a62-c3f2-16bdad5ed196@amd.com>
Date:   Wed, 17 Oct 2018 14:50:45 +0000
From:   "Moger, Babu" <Babu.Moger@....com>
To:     Fenghua Yu <fenghua.yu@...el.com>
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Subject: Re: [PATCH v4 08/13] arch/x86: Bring few more functions into the
 resource structure

Hi Fenghua,

On 10/16/2018 06:45 PM, Fenghua Yu wrote:
> On Mon, Oct 15, 2018 at 08:55:49PM +0000, Moger, Babu wrote:
>> update_mba_bw : Feedback loop bandwidth update functionality is not
>>                 needed for AMD.
> 
> Will you implement update_mba_bw() for AMD in future?

No. There is no plan.

> 
>>  		list_for_each_entry(crgrp, head, mon.crdtgrp_list)
>>  			mbm_update(d, crgrp->mon.rmid);
>>  
>> -		if (is_mba_sc(NULL))
>> -			update_mba_bw(prgrp, d);
>> +		if (is_mba_sc(NULL)) {
>> +			r_mba = &rdt_resources_all[RDT_RESOURCE_MBA];
>> +			if (r_mba->update_mba_bw)
>> +				r_mba->update_mba_bw(prgrp, d);
>> +		}
> 
> Mount option "mba_MBps" is not implemented on AMD. Then don't
> call set_mba_sc(true) in parse_rdtgroupfs_options().
> 
> Thus, you don't need to change this code here because is_mba_sc(NULL) is
> false on AMD.

Yes. is_mba_sc(NULL) is false on AMD. I can remove this change.

> 
> Thanks.
> 
> -Fenghua
>