Re: [PATCH v10 09/13] x86/resctrl: Add interface to read mbm_total_bytes_config

[Reinette Chatre]

Hi Babu,

On 12/22/2022 3:31 PM, Babu Moger wrote:
> The event configuration can be viewed by the user by reading the
> configuration file /sys/fs/resctrl/info/L3_MON/mbm_total_bytes_config.
> The event configuration settings are domain specific and will affect all
> the CPUs in the domain.
> 
> Following are the types of events supported:
> ====  ===========================================================
> Bits   Description
> ====  ===========================================================
> 6      Dirty Victims from the QOS domain to all types of memory
> 5      Reads to slow memory in the non-local NUMA domain
> 4      Reads to slow memory in the local NUMA domain
> 3      Non-temporal writes to non-local NUMA domain
> 2      Non-temporal writes to local NUMA domain
> 1      Reads to memory in the non-local NUMA domain
> 0      Reads to memory in the local NUMA domain
> ====  ===========================================================
> 
> By default, the mbm_total_bytes_config is set to 0x7f to count all the
> event types.
> 
> For example:
>     $cat /sys/fs/resctrl/info/L3_MON/mbm_total_bytes_config
>     0=0x7f;1=0x7f;2=0x7f;3=0x7f
> 
>     In this case, the event mbm_total_bytes is configured with 0x7f on
>     domains 0 to 3.
> 
> Signed-off-by: Babu Moger <babu.moger@xxxxxxx>

...

> --- a/arch/x86/kernel/cpu/resctrl/internal.h
> +++ b/arch/x86/kernel/cpu/resctrl/internal.h
> @@ -30,6 +30,29 @@
>   */
>  #define MBM_CNTR_WIDTH_OFFSET_MAX (62 - MBM_CNTR_WIDTH_BASE)
>  
> +/* Reads to Local DRAM Memory */
> +#define READS_TO_LOCAL_MEM		BIT(0)
> +
> +/* Reads to Remote DRAM Memory */
> +#define READS_TO_REMOTE_MEM		BIT(1)
> +
> +/* Non-Temporal Writes to Local Memory */
> +#define NON_TEMP_WRITE_TO_LOCAL_MEM	BIT(2)
> +
> +/* Non-Temporal Writes to Remote Memory */
> +#define NON_TEMP_WRITE_TO_REMOTE_MEM	BIT(3)
> +
> +/* Reads to Local Memory the system identifies as "Slow Memory" */
> +#define READS_TO_LOCAL_S_MEM		BIT(4)
> +
> +/* Reads to Remote Memory the system identifies as "Slow Memory" */
> +#define READS_TO_REMOTE_S_MEM		BIT(5)
> +
> +/* Dirty Victims to All Types of Memory */
> +#define  DIRTY_VICTIMS_TO_ALL_MEM	BIT(6)

Some stray white space above.

> +
> +/* Max event bits supported */
> +#define MAX_EVT_CONFIG_BITS		GENMASK(6, 0)
>  
>  struct rdt_fs_context {
>  	struct kernfs_fs_context	kfc;

Please remove stray white space. With that:

Reviewed-by: Reinette Chatre <reinette.chatre@xxxxxxxxx>

Reinette