linux-kernel - Re: [PATCH 08/10] x86/intel_rdt: Implement scheduling support for Intel RDT

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Date:	Sat, 6 Jun 2015 11:43:25 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Vikas Shivappa <vikas.shivappa@...ux.intel.com>
cc:	linux-kernel@...r.kernel.org, vikas.shivappa@...el.com,
	x86@...nel.org, hpa@...or.com, mingo@...nel.org, tj@...nel.org,
	peterz@...radead.org, matt.fleming@...el.com, will.auld@...el.com,
	kanaka.d.juvva@...el.com
Subject: Re: [PATCH 08/10] x86/intel_rdt: Implement scheduling support for
 Intel RDT

On Thu, 4 Jun 2015, Vikas Shivappa wrote:
> +static inline void intel_rdt_sched_in(void)
> +{
> +	if (static_key_false(&rdt_enable_key))
> +		__intel_rdt_sched_in();

So if the enable_key is FALSE we call the RDT stuff? I might be
missing something important, but this does not make any sense and I
have to ask how that whole stuff has been tested.

>  /*
>   * Protects cache_cgroups and cqm_rmid_free_lru and cqm_rmid_limbo_lru.
> @@ -403,8 +384,8 @@ static void __intel_cqm_event_count(void *info);
>  static u32 intel_cqm_xchg_rmid(struct perf_event *group, u32 rmid)
>  {
>  	struct perf_event *event;
> -	struct list_head *head = &group->hw.cqm_group_entry;
>  	u32 old_rmid = group->hw.cqm_rmid;
> +	struct list_head *head = &group->hw.cqm_group_entry;

And this change is necessary because?
  
Thanks,

	tglx
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