Re: [PATCH v3 27/47] arm_mpam: resctrl: Add support for 'MB' resource

[Jonathan Cameron]

On Mon, 12 Jan 2026 16:58:54 +0000
Ben Horgan <ben.horgan@xxxxxxx> wrote:

> From: James Morse <james.morse@xxxxxxx>
> 
> resctrl supports 'MB', as a percentage throttling of traffic somewhere
> after the L3. This is the control that mba_sc uses, so ideally the class
> chosen should be as close as possible to the counters used for mba_local.
> 
> MB's percentage control should be backed either with the fixed point
> fraction MBW_MAX or bandwidth portion bitmaps. The bandwidth portion
> bitmaps is not used as its tricky to pick which bits to use to avoid
> contention, and may be possible to expose this as something other than a
> percentage in the future.
> 
> CC: Zeng Heng <zengheng4@xxxxxxxxxx>
> Co-developed-by: Dave Martin <Dave.Martin@xxxxxxx>
> Signed-off-by: Dave Martin <Dave.Martin@xxxxxxx>
> Signed-off-by: James Morse <james.morse@xxxxxxx>>
> Signed-off-by: Ben Horgan <ben.horgan@xxxxxxx>
Reviewed-by: Jonathan Cameron <jonathan.cameron@xxxxxxxxxx>