Re: [PATCH v1 04/31] x86/resctrl: Add helper for setting CPU default properties

[Reinette Chatre]

Hi James,

On 3/21/2024 9:50 AM, James Morse wrote:

> --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> @@ -3623,14 +3623,18 @@ static int rdtgroup_mkdir(struct kernfs_node *parent_kn, const char *name,
>  static int rdtgroup_rmdir_mon(struct rdtgroup *rdtgrp, cpumask_var_t tmpmask)
>  {
>  	struct rdtgroup *prdtgrp = rdtgrp->mon.parent;
> +	u32 closid, rmid;
>  	int cpu;
>  
>  	/* Give any tasks back to the parent group */
>  	rdt_move_group_tasks(rdtgrp, prdtgrp, tmpmask);
>  
>  	/* Update per cpu rmid of the moved CPUs first */
> +	closid = rdtgrp->closid;
> +	rmid = prdtgrp->mon.rmid;
>  	for_each_cpu(cpu, &rdtgrp->cpu_mask)
> -		per_cpu(pqr_state.default_rmid, cpu) = prdtgrp->mon.rmid;
> +		resctrl_arch_set_cpu_default_closid_rmid(cpu, closid, rmid);
> +

While I understand that the CLOSIDs are the same, I do think it looks unexpected
for the CLOSID to be set to the CLOSID of the group being removed. Could this
be set to CLOSID of parent group instead?

Reinette