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| From | Thomas Gleixner <tglx@linutronix.de> |
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH 08/32] Define CONFIG_INTEL_RDT |
| Date | Wed, 13 Jul 2016 12:30:04 +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> |
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| X-Original-Cc | Ingo Molnar <mingo@elte.hu>, "H. Peter Anvin" <h.peter.anvin@intel.com>, Tony Luck <tony.luck@intel.com>, Tejun Heo <tj@kernel.org>, Borislav Petkov <bp@suse.de>, Stephane Eranian <eranian@google.com>, Peter Zijlstra <peterz@infradead.org>, Marcelo Tosatti <mtosatti@redhat.com>, David Carrillo-Cisneros <davidcc@google.com>, Ravi V Shankar <ravi.v.shankar@intel.com>, Vikas Shivappa <vikas.shivappa@linux.intel.com>, Sai Prakhya <sai.praneeth.prakhya@intel.com>, linux-kernel <linux-kernel@vger.kernel.org>, x86 <x86@kernel.org> |
| X-Original-Date | Wed, 13 Jul 2016 12:25:39 +0200 (CEST) |
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| X-Original-References | <1468371785-53231-1-git-send-email-fenghua.yu@intel.com> <1468371785-53231-9-git-send-email-fenghua.yu@intel.com> |
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| Xref | csiph.com linux.kernel:1442314 |
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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
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[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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