Re: [PATCH v7 09/24] x86/resctrl: Introduce bitmap mbm_cntr_free_map to track assignable counters

[Moger, Babu]

Hi Peter,

On 9/24/24 11:25, Peter Newman wrote:
> Hi Babu,
> 
> On Wed, Sep 4, 2024 at 3:23 PM Babu Moger <babu.moger@xxxxxxx> wrote:
> 
>> diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
>> index f11d6fdfd977..aab22ff8e0c1 100644
>> --- a/include/linux/resctrl.h
>> +++ b/include/linux/resctrl.h
>> @@ -187,12 +187,14 @@ enum resctrl_scope {
>>   * @num_rmid:          Number of RMIDs available
>>   * @num_mbm_cntrs:     Number of assignable monitoring counters
>>   * @mbm_cntr_assignable:Is system capable of supporting monitor assignment?
>> + * @mbm_cntr_free_map: bitmap of number of assignable MBM counters
>>   * @evt_list:          List of monitoring events
>>   */
>>  struct resctrl_mon {
>>         int                     num_rmid;
>>         int                     num_mbm_cntrs;
>>         bool                    mbm_cntr_assignable;
>> +       unsigned long           *mbm_cntr_free_map;
>>         struct list_head        evt_list;
>>  };
> 
> This looks global still. Will only all-domain (*=) operations be
> supported initially?

Yes. It is supported in this series.

We have one counter at global level and another at domain level.
https://lore.kernel.org/lkml/7a24bb182897acab3daaac1cadaabca3bcc73dc5.1725488488.git.babu.moger@xxxxxxx/

Domain level counter is used for tracking the counters status in each domain.

Global counter is released once the counter is freed in all the domains.

-- 
Thanks
Babu Moger