Re: [PATCH 08/32] Define CONFIG_INTEL_RDT

From	Thomas Gleixner <tglx@linutronix.de>
Newsgroups	linux.kernel
Subject	Re: [PATCH 08/32] Define CONFIG_INTEL_RDT
Date	2016-07-13 12:30 +0200
Message-ID	<rUpAw-1Nt-91@gated-at.bofh.it> (permalink)
References	<rUe2l-2xx-3@gated-at.bofh.it> <rUe2o-2xx-89@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Tue, 12 Jul 2016, Fenghua Yu wrote:

Subject: Define CONFIG_INTEL_RDT

That does not qualify as a proper patch subject

> From: Vikas Shivappa <vikas.shivappa@linux.intel.com>
> 
> CONFIG_INTEL_RDT is defined. 

That tells us what?

> --- a/arch/x86/include/asm/intel_rdt.h
> +++ b/arch/x86/include/asm/intel_rdt.h
> @@ -24,8 +24,16 @@ struct clos_cbm_table {
>   * on scheduler hot path:
>   * - This will stay as no-op unless we are running on an Intel SKU
>   * which supports L3 cache allocation.
> + * - When support is present and enabled, does not do any
> + * IA32_PQR_MSR writes until the user starts really using the feature
> + * ie creates a rdtgroup directory and assigns a cache_mask thats
> + * different from the root rdtgroup's cache_mask.
>   * - Caches the per cpu CLOSid values and does the MSR write only
> - * when a task with a different CLOSid is scheduled in.
> + * when a task with a different CLOSid is scheduled in. That
> + * means the task belongs to a different rdtgroup.
> + * - Closids are allocated so that different rdtgroup directories
> + * with same cache_mask gets the same CLOSid. This minimizes CLOSids
> + * used and reduces MSR write frequency.

How is this and the following changes related to $subject ?

Thanks,

	tglx

Thread

[PATCH 08/32] Define CONFIG_INTEL_RDT "Fenghua Yu" <fenghua.yu@intel.com> - 2016-07-13 00:10 +0200
  Re: [PATCH 08/32] Define CONFIG_INTEL_RDT Thomas Gleixner <tglx@linutronix.de> - 2016-07-13 12:30 +0200
    RE: [PATCH 08/32] Define CONFIG_INTEL_RDT "Yu, Fenghua" <fenghua.yu@intel.com> - 2016-07-13 20:10 +0200
      RE: [PATCH 08/32] Define CONFIG_INTEL_RDT "Yu, Fenghua" <fenghua.yu@intel.com> - 2016-07-13 23:20 +0200
      RE: [PATCH 08/32] Define CONFIG_INTEL_RDT Thomas Gleixner <tglx@linutronix.de> - 2016-07-13 23:20 +0200

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