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

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Message-ID: <20181016234556.GB39177@romley-ivt3.sc.intel.com>
Date:   Tue, 16 Oct 2018 16:45:56 -0700
From:   Fenghua Yu <fenghua.yu@...el.com>
To:     "Moger, Babu" <Babu.Moger@....com>
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Subject: Re: [PATCH v4 08/13] arch/x86: Bring few more functions into the
 resource structure

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?

>  		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.

Thanks.

-Fenghua